src/xterm.js

   1 /**
   2  * xterm.js: xterm, in the browser
   3  * Originally forked from (with the author's permission):
   4  *   Fabrice Bellard's javascript vt100 for jslinux:
   5  *   http://bellard.org/jslinux/
   6  *   Copyright (c) 2011 Fabrice Bellard
   7  *   The original design remains. The terminal itself
   8  *   has been extended to include xterm CSI codes, among
   9  *   other features.
  10  * @license MIT
  11  */
  12
  13 import { CompositionHelper } from './CompositionHelper.js';
  14 import { EventEmitter } from './EventEmitter.js';
  15 import { Viewport } from './Viewport.js';
  16 import { rightClickHandler, pasteHandler, copyHandler } from './handlers/Clipboard.js';
  17 import { CircularList } from './utils/CircularList.js';
  18 import * as Browser from './utils/Browser';
  19 import * as Keyboard from './utils/Keyboard';
  20
  21 /**
  22  * Terminal Emulation References:
  23  *   http://vt100.net/
  24  *   http://invisible-island.net/xterm/ctlseqs/ctlseqs.txt
  25  *   http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
  26  *   http://invisible-island.net/vttest/
  27  *   http://www.inwap.com/pdp10/ansicode.txt
  28  *   http://linux.die.net/man/4/console_codes
  29  *   http://linux.die.net/man/7/urxvt
  30  */
  31
  32 // Let it work inside Node.js for automated testing purposes.
  33 var document = (typeof window != 'undefined') ? window.document : null;
  34
  35 /**
  36  * States
  37  */
  38 var normal = 0, escaped = 1, csi = 2, osc = 3, charset = 4, dcs = 5, ignore = 6;
  39
  40 /**
  41  * Terminal
  42  */
  43
  44 /**
  45  * Creates a new `Terminal` object.
  46  *
  47  * @param {object} options An object containing a set of options, the available options are:
  48  *   - `cursorBlink` (boolean): Whether the terminal cursor blinks
  49  *   - `cols` (number): The number of columns of the terminal (horizontal size)
  50  *   - `rows` (number): The number of rows of the terminal (vertical size)
  51  *
  52  * @public
  53  * @class Xterm Xterm
  54  * @alias module:xterm/src/xterm
  55  */
  56 function Terminal(options) {
  57   var self = this;
  58
  59   if (!(this instanceof Terminal)) {
  60     return new Terminal(arguments[0], arguments[1], arguments[2]);
  61   }
  62
  63   self.browser = Browser;
  64   self.cancel = Terminal.cancel;
  65
  66   EventEmitter.call(this);
  67
  68   if (typeof options === 'number') {
  69     options = {
  70       cols: arguments[0],
  71       rows: arguments[1],
  72       handler: arguments[2]
  73     };
  74   }
  75
  76   options = options || {};
  77
  78
  79   Object.keys(Terminal.defaults).forEach(function(key) {
  80     if (options[key] == null) {
  81       options[key] = Terminal.options[key];
  82
  83       if (Terminal[key] !== Terminal.defaults[key]) {
  84         options[key] = Terminal[key];
  85       }
  86     }
  87     self[key] = options[key];
  88   });
  89
  90   if (options.colors.length === 8) {
  91     options.colors = options.colors.concat(Terminal._colors.slice(8));
  92   } else if (options.colors.length === 16) {
  93     options.colors = options.colors.concat(Terminal._colors.slice(16));
  94   } else if (options.colors.length === 10) {
  95     options.colors = options.colors.slice(0, -2).concat(
  96       Terminal._colors.slice(8, -2), options.colors.slice(-2));
  97   } else if (options.colors.length === 18) {
  98     options.colors = options.colors.concat(
  99       Terminal._colors.slice(16, -2), options.colors.slice(-2));
 100   }
 101   this.colors = options.colors;
 102
 103   this.options = options;
 104
 105   // this.context = options.context || window;
 106   // this.document = options.document || document;
 107   this.parent = options.body || options.parent || (
 108     document ? document.getElementsByTagName('body')[0] : null
 109   );
 110
 111   this.cols = options.cols || options.geometry[0];
 112   this.rows = options.rows || options.geometry[1];
 113   this.geometry = [this.cols, this.rows];
 114
 115   if (options.handler) {
 116     this.on('data', options.handler);
 117   }
 118
 119   /**
 120    * The scroll position of the y cursor, ie. ybase + y = the y position within the entire
 121    * buffer
 122    */
 123   this.ybase = 0;
 124
 125   /**
 126    * The scroll position of the viewport
 127    */
 128   this.ydisp = 0;
 129
 130   /**
 131    * The cursor's x position after ybase
 132    */
 133   this.x = 0;
 134
 135   /**
 136    * The cursor's y position after ybase
 137    */
 138   this.y = 0;
 139
 140   /**
 141    * Used to debounce the refresh function
 142    */
 143   this.isRefreshing = false;
 144
 145   /**
 146    * Whether there is a full terminal refresh queued
 147    */
 148
 149   this.cursorState = 0;
 150   this.cursorHidden = false;
 151   this.convertEol;
 152   this.state = 0;
 153   this.queue = '';
 154   this.scrollTop = 0;
 155   this.scrollBottom = this.rows - 1;
 156   this.customKeydownHandler = null;
 157
 158   // modes
 159   this.applicationKeypad = false;
 160   this.applicationCursor = false;
 161   this.originMode = false;
 162   this.insertMode = false;
 163   this.wraparoundMode = true; // defaults: xterm - true, vt100 - false
 164   this.normal = null;
 165
 166   // charset
 167   this.charset = null;
 168   this.gcharset = null;
 169   this.glevel = 0;
 170   this.charsets = [null];
 171
 172   // mouse properties
 173   this.decLocator;
 174   this.x10Mouse;
 175   this.vt200Mouse;
 176   this.vt300Mouse;
 177   this.normalMouse;
 178   this.mouseEvents;
 179   this.sendFocus;
 180   this.utfMouse;
 181   this.sgrMouse;
 182   this.urxvtMouse;
 183
 184   // misc
 185   this.element;
 186   this.children;
 187   this.refreshStart;
 188   this.refreshEnd;
 189   this.savedX;
 190   this.savedY;
 191   this.savedCols;
 192
 193   // stream
 194   this.readable = true;
 195   this.writable = true;
 196
 197   this.defAttr = (0 << 18) | (257 << 9) | (256 << 0);
 198   this.curAttr = this.defAttr;
 199
 200   this.params = [];
 201   this.currentParam = 0;
 202   this.prefix = '';
 203   this.postfix = '';
 204
 205   // leftover surrogate high from previous write invocation
 206   this.surrogate_high = '';
 207
 208   /**
 209    * An array of all lines in the entire buffer, including the prompt. The lines are array of
 210    * characters which are 2-length arrays where [0] is an attribute and [1] is the character.
 211    */
 212   this.lines = new CircularList(this.scrollback);
 213   var i = this.rows;
 214   while (i--) {
 215     this.lines.push(this.blankLine());
 216   }
 217
 218   this.tabs;
 219   this.setupStops();
 220
 221   // Store if user went browsing history in scrollback
 222   this.userScrolling = false;
 223 }
 224
 225 inherits(Terminal, EventEmitter);
 226
 227 /**
 228  * back_color_erase feature for xterm.
 229  */
 230 Terminal.prototype.eraseAttr = function() {
 231   // if (this.is('screen')) return this.defAttr;
 232   return (this.defAttr & ~0x1ff) | (this.curAttr & 0x1ff);
 233 };
 234
 235 /**
 236  * Colors
 237  */
 238
 239 // Colors 0-15
 240 Terminal.tangoColors = [
 241   // dark:
 242   '#2e3436',
 243   '#cc0000',
 244   '#4e9a06',
 245   '#c4a000',
 246   '#3465a4',
 247   '#75507b',
 248   '#06989a',
 249   '#d3d7cf',
 250   // bright:
 251   '#555753',
 252   '#ef2929',
 253   '#8ae234',
 254   '#fce94f',
 255   '#729fcf',
 256   '#ad7fa8',
 257   '#34e2e2',
 258   '#eeeeec'
 259 ];
 260
 261 // Colors 0-15 + 16-255
 262 // Much thanks to TooTallNate for writing this.
 263 Terminal.colors = (function() {
 264   var colors = Terminal.tangoColors.slice()
 265   , r = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]
 266   , i;
 267
 268   // 16-231
 269   i = 0;
 270   for (; i < 216; i++) {
 271     out(r[(i / 36) % 6 | 0], r[(i / 6) % 6 | 0], r[i % 6]);
 272   }
 273
 274   // 232-255 (grey)
 275   i = 0;
 276   for (; i < 24; i++) {
 277     r = 8 + i * 10;
 278     out(r, r, r);
 279   }
 280
 281   function out(r, g, b) {
 282     colors.push('#' + hex(r) + hex(g) + hex(b));
 283   }
 284
 285   function hex(c) {
 286     c = c.toString(16);
 287     return c.length < 2 ? '0' + c : c;
 288   }
 289
 290   return colors;
 291 })();
 292
 293 Terminal._colors = Terminal.colors.slice();
 294
 295 Terminal.vcolors = (function() {
 296   var out = []
 297   , colors = Terminal.colors
 298   , i = 0
 299   , color;
 300
 301   for (; i < 256; i++) {
 302     color = parseInt(colors[i].substring(1), 16);
 303     out.push([
 304       (color >> 16) & 0xff,
 305       (color >> 8) & 0xff,
 306       color & 0xff
 307     ]);
 308   }
 309
 310   return out;
 311 })();
 312
 313 /**
 314  * Options
 315  */
 316
 317 Terminal.defaults = {
 318   colors: Terminal.colors,
 319   theme: 'default',
 320   convertEol: false,
 321   termName: 'xterm',
 322   geometry: [80, 24],
 323   cursorBlink: false,
 324   visualBell: false,
 325   popOnBell: false,
 326   scrollback: 1000,
 327   screenKeys: false,
 328   debug: false,
 329   cancelEvents: false
 330   // programFeatures: false,
 331   // focusKeys: false,
 332 };
 333
 334 Terminal.options = {};
 335
 336 Terminal.focus = null;
 337
 338 each(keys(Terminal.defaults), function(key) {
 339   Terminal[key] = Terminal.defaults[key];
 340   Terminal.options[key] = Terminal.defaults[key];
 341 });
 342
 343 /**
 344  * Focus the terminal. Delegates focus handling to the terminal's DOM element.
 345  */
 346 Terminal.prototype.focus = function() {
 347   return this.textarea.focus();
 348 };
 349
 350 /**
 351  * Retrieves an option's value from the terminal.
 352  * @param {string} key The option key.
 353  */
 354 Terminal.prototype.getOption = function(key, value) {
 355   if (!(key in Terminal.defaults)) {
 356     throw new Error('No option with key "' + key + '"');
 357   }
 358
 359   if (typeof this.options[key] !== 'undefined') {
 360     return this.options[key];
 361   }
 362
 363   return this[key];
 364 };
 365
 366 /**
 367  * Sets an option on the terminal.
 368  * @param {string} key The option key.
 369  * @param {string} value The option value.
 370  */
 371 Terminal.prototype.setOption = function(key, value) {
 372   if (!(key in Terminal.defaults)) {
 373     throw new Error('No option with key "' + key + '"');
 374   }
 375   this[key] = value;
 376   this.options[key] = value;
 377 };
 378
 379 /**
 380  * Binds the desired focus behavior on a given terminal object.
 381  *
 382  * @static
 383  */
 384 Terminal.bindFocus = function (term) {
 385   on(term.textarea, 'focus', function (ev) {
 386     if (term.sendFocus) {
 387       term.send('\x1b[I');
 388     }
 389     term.element.classList.add('focus');
 390     term.showCursor();
 391     Terminal.focus = term;
 392     term.emit('focus', {terminal: term});
 393   });
 394 };
 395
 396 /**
 397  * Blur the terminal. Delegates blur handling to the terminal's DOM element.
 398  */
 399 Terminal.prototype.blur = function() {
 400   return this.textarea.blur();
 401 };
 402
 403 /**
 404  * Binds the desired blur behavior on a given terminal object.
 405  *
 406  * @static
 407  */
 408 Terminal.bindBlur = function (term) {
 409   on(term.textarea, 'blur', function (ev) {
 410     term.refresh(term.y, term.y);
 411     if (term.sendFocus) {
 412       term.send('\x1b[O');
 413     }
 414     term.element.classList.remove('focus');
 415     Terminal.focus = null;
 416     term.emit('blur', {terminal: term});
 417   });
 418 };
 419
 420 /**
 421  * Initialize default behavior
 422  */
 423 Terminal.prototype.initGlobal = function() {
 424   var term = this;
 425
 426   Terminal.bindKeys(this);
 427   Terminal.bindFocus(this);
 428   Terminal.bindBlur(this);
 429
 430   // Bind clipboard functionality
 431   on(this.element, 'copy', function (ev) {
 432     copyHandler.call(this, ev, term);
 433   });
 434   on(this.textarea, 'paste', function (ev) {
 435     pasteHandler.call(this, ev, term);
 436   });
 437   on(this.element, 'paste', function (ev) {
 438     pasteHandler.call(this, ev, term);
 439   });
 440
 441   function rightClickHandlerWrapper (ev) {
 442     rightClickHandler.call(this, ev, term);
 443   }
 444
 445   if (term.browser.isFirefox) {
 446     on(this.element, 'mousedown', function (ev) {
 447       if (ev.button == 2) {
 448         rightClickHandlerWrapper(ev);
 449       }
 450     });
 451   } else {
 452     on(this.element, 'contextmenu', rightClickHandlerWrapper);
 453   }
 454 };
 455
 456 /**
 457  * Apply key handling to the terminal
 458  */
 459 Terminal.bindKeys = function(term) {
 460   on(term.element, 'keydown', function(ev) {
 461     if (document.activeElement != this) {
 462       return;
 463     }
 464     term.keyDown(ev);
 465   }, true);
 466
 467   on(term.element, 'keypress', function(ev) {
 468     if (document.activeElement != this) {
 469       return;
 470     }
 471     term.keyPress(ev);
 472   }, true);
 473
 474   on(term.element, 'keyup', term.focus.bind(term));
 475
 476   on(term.textarea, 'keydown', function(ev) {
 477     term.keyDown(ev);
 478   }, true);
 479
 480   on(term.textarea, 'keypress', function(ev) {
 481     term.keyPress(ev);
 482     // Truncate the textarea's value, since it is not needed
 483     this.value = '';
 484   }, true);
 485
 486   on(term.textarea, 'compositionstart', term.compositionHelper.compositionstart.bind(term.compositionHelper));
 487   on(term.textarea, 'compositionupdate', term.compositionHelper.compositionupdate.bind(term.compositionHelper));
 488   on(term.textarea, 'compositionend', term.compositionHelper.compositionend.bind(term.compositionHelper));
 489   term.on('refresh', term.compositionHelper.updateCompositionElements.bind(term.compositionHelper));
 490 };
 491
 492
 493 /**
 494  * Insert the given row to the terminal or produce a new one
 495  * if no row argument is passed. Return the inserted row.
 496  * @param {HTMLElement} row (optional) The row to append to the terminal.
 497  */
 498 Terminal.prototype.insertRow = function (row) {
 499   if (typeof row != 'object') {
 500     row = document.createElement('div');
 501   }
 502
 503   this.rowContainer.appendChild(row);
 504   this.children.push(row);
 505
 506   return row;
 507 };
 508
 509 /**
 510  * Opens the terminal within an element.
 511  *
 512  * @param {HTMLElement} parent The element to create the terminal within.
 513  */
 514 Terminal.prototype.open = function(parent) {
 515   var self=this, i=0, div;
 516
 517   this.parent = parent || this.parent;
 518
 519   if (!this.parent) {
 520     throw new Error('Terminal requires a parent element.');
 521   }
 522
 523   // Grab global elements
 524   this.context = this.parent.ownerDocument.defaultView;
 525   this.document = this.parent.ownerDocument;
 526   this.body = this.document.getElementsByTagName('body')[0];
 527
 528   //Create main element container
 529   this.element = this.document.createElement('div');
 530   this.element.classList.add('terminal');
 531   this.element.classList.add('xterm');
 532   this.element.classList.add('xterm-theme-' + this.theme);
 533
 534   this.element.style.height
 535   this.element.setAttribute('tabindex', 0);
 536
 537   this.viewportElement = document.createElement('div');
 538   this.viewportElement.classList.add('xterm-viewport');
 539   this.element.appendChild(this.viewportElement);
 540   this.viewportScrollArea = document.createElement('div');
 541   this.viewportScrollArea.classList.add('xterm-scroll-area');
 542   this.viewportElement.appendChild(this.viewportScrollArea);
 543
 544   // Create the container that will hold the lines of the terminal and then
 545   // produce the lines the lines.
 546   this.rowContainer = document.createElement('div');
 547   this.rowContainer.classList.add('xterm-rows');
 548   this.element.appendChild(this.rowContainer);
 549   this.children = [];
 550
 551   // Create the container that will hold helpers like the textarea for
 552   // capturing DOM Events. Then produce the helpers.
 553   this.helperContainer = document.createElement('div');
 554   this.helperContainer.classList.add('xterm-helpers');
 555   // TODO: This should probably be inserted once it's filled to prevent an additional layout
 556   this.element.appendChild(this.helperContainer);
 557   this.textarea = document.createElement('textarea');
 558   this.textarea.classList.add('xterm-helper-textarea');
 559   this.textarea.setAttribute('autocorrect', 'off');
 560   this.textarea.setAttribute('autocapitalize', 'off');
 561   this.textarea.setAttribute('spellcheck', 'false');
 562   this.textarea.tabIndex = 0;
 563   this.textarea.addEventListener('focus', function() {
 564     self.emit('focus', {terminal: self});
 565   });
 566   this.textarea.addEventListener('blur', function() {
 567     self.emit('blur', {terminal: self});
 568   });
 569   this.helperContainer.appendChild(this.textarea);
 570
 571   this.compositionView = document.createElement('div');
 572   this.compositionView.classList.add('composition-view');
 573   this.compositionHelper = new CompositionHelper(this.textarea, this.compositionView, this);
 574   this.helperContainer.appendChild(this.compositionView);
 575
 576   this.charMeasureElement = document.createElement('div');
 577   this.charMeasureElement.classList.add('xterm-char-measure-element');
 578   this.charMeasureElement.innerHTML = 'W';
 579   this.helperContainer.appendChild(this.charMeasureElement);
 580
 581   for (; i < this.rows; i++) {
 582     this.insertRow();
 583   }
 584   this.parent.appendChild(this.element);
 585
 586   this.viewport = new Viewport(this, this.viewportElement, this.viewportScrollArea, this.charMeasureElement);
 587
 588   // Draw the screen.
 589   this.refresh(0, this.rows - 1);
 590
 591   // Initialize global actions that
 592   // need to be taken on the document.
 593   this.initGlobal();
 594
 595   // Ensure there is a Terminal.focus.
 596   this.focus();
 597
 598   on(this.element, 'click', function() {
 599     var selection = document.getSelection(),
 600         collapsed = selection.isCollapsed,
 601         isRange = typeof collapsed == 'boolean' ? !collapsed : selection.type == 'Range';
 602     if (!isRange) {
 603       self.focus();
 604     }
 605   });
 606
 607   // Listen for mouse events and translate
 608   // them into terminal mouse protocols.
 609   this.bindMouse();
 610
 611   // Figure out whether boldness affects
 612   // the character width of monospace fonts.
 613   if (Terminal.brokenBold == null) {
 614     Terminal.brokenBold = isBoldBroken(this.document);
 615   }
 616
 617   /**
 618    * This event is emitted when terminal has completed opening.
 619    *
 620    * @event open
 621    */
 622   this.emit('open');
 623 };
 624
 625
 626 /**
 627  * Attempts to load an add-on using CommonJS or RequireJS (whichever is available).
 628  * @param {string} addon The name of the addon to load
 629  * @static
 630  */
 631 Terminal.loadAddon = function(addon, callback) {
 632   if (typeof exports === 'object' && typeof module === 'object') {
 633     // CommonJS
 634     return require('./addons/' + addon + '/' + addon);
 635   } else if (typeof define == 'function') {
 636     // RequireJS
 637     return require(['./addons/' + addon + '/' + addon], callback);
 638   } else {
 639     console.error('Cannot load a module without a CommonJS or RequireJS environment.');
 640     return false;
 641   }
 642 };
 643
 644
 645 /**
 646  * XTerm mouse events
 647  * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
 648  * To better understand these
 649  * the xterm code is very helpful:
 650  * Relevant files:
 651  *   button.c, charproc.c, misc.c
 652  * Relevant functions in xterm/button.c:
 653  *   BtnCode, EmitButtonCode, EditorButton, SendMousePosition
 654  */
 655 Terminal.prototype.bindMouse = function() {
 656   var el = this.element, self = this, pressed = 32;
 657
 658   // mouseup, mousedown, wheel
 659   // left click: ^[[M 3<^[[M#3<
 660   // wheel up: ^[[M`3>
 661   function sendButton(ev) {
 662     var button
 663     , pos;
 664
 665     // get the xterm-style button
 666     button = getButton(ev);
 667
 668     // get mouse coordinates
 669     pos = getCoords(ev);
 670     if (!pos) return;
 671
 672     sendEvent(button, pos);
 673
 674     switch (ev.overrideType || ev.type) {
 675       case 'mousedown':
 676         pressed = button;
 677         break;
 678       case 'mouseup':
 679         // keep it at the left
 680         // button, just in case.
 681         pressed = 32;
 682         break;
 683       case 'wheel':
 684         // nothing. don't
 685         // interfere with
 686         // `pressed`.
 687         break;
 688     }
 689   }
 690
 691   // motion example of a left click:
 692   // ^[[M 3<^[[M@4<^[[M@5<^[[M@6<^[[M@7<^[[M#7<
 693   function sendMove(ev) {
 694     var button = pressed
 695     , pos;
 696
 697     pos = getCoords(ev);
 698     if (!pos) return;
 699
 700     // buttons marked as motions
 701     // are incremented by 32
 702     button += 32;
 703
 704     sendEvent(button, pos);
 705   }
 706
 707   // encode button and
 708   // position to characters
 709   function encode(data, ch) {
 710     if (!self.utfMouse) {
 711       if (ch === 255) return data.push(0);
 712       if (ch > 127) ch = 127;
 713       data.push(ch);
 714     } else {
 715       if (ch === 2047) return data.push(0);
 716       if (ch < 127) {
 717         data.push(ch);
 718       } else {
 719         if (ch > 2047) ch = 2047;
 720         data.push(0xC0 | (ch >> 6));
 721         data.push(0x80 | (ch & 0x3F));
 722       }
 723     }
 724   }
 725
 726   // send a mouse event:
 727   // regular/utf8: ^[[M Cb Cx Cy
 728   // urxvt: ^[[ Cb ; Cx ; Cy M
 729   // sgr: ^[[ Cb ; Cx ; Cy M/m
 730   // vt300: ^[[ 24(1/3/5)~ [ Cx , Cy ] \r
 731   // locator: CSI P e ; P b ; P r ; P c ; P p & w
 732   function sendEvent(button, pos) {
 733     // self.emit('mouse', {
 734     //   x: pos.x - 32,
 735     //   y: pos.x - 32,
 736     //   button: button
 737     // });
 738
 739     if (self.vt300Mouse) {
 740       // NOTE: Unstable.
 741       // http://www.vt100.net/docs/vt3xx-gp/chapter15.html
 742       button &= 3;
 743       pos.x -= 32;
 744       pos.y -= 32;
 745       var data = '\x1b[24';
 746       if (button === 0) data += '1';
 747       else if (button === 1) data += '3';
 748       else if (button === 2) data += '5';
 749       else if (button === 3) return;
 750       else data += '0';
 751       data += '~[' + pos.x + ',' + pos.y + ']\r';
 752       self.send(data);
 753       return;
 754     }
 755
 756     if (self.decLocator) {
 757       // NOTE: Unstable.
 758       button &= 3;
 759       pos.x -= 32;
 760       pos.y -= 32;
 761       if (button === 0) button = 2;
 762       else if (button === 1) button = 4;
 763       else if (button === 2) button = 6;
 764       else if (button === 3) button = 3;
 765       self.send('\x1b['
 766                 + button
 767                 + ';'
 768                 + (button === 3 ? 4 : 0)
 769                 + ';'
 770                 + pos.y
 771                 + ';'
 772                 + pos.x
 773                 + ';'
 774                 + (pos.page || 0)
 775                 + '&w');
 776       return;
 777     }
 778
 779     if (self.urxvtMouse) {
 780       pos.x -= 32;
 781       pos.y -= 32;
 782       pos.x++;
 783       pos.y++;
 784       self.send('\x1b[' + button + ';' + pos.x + ';' + pos.y + 'M');
 785       return;
 786     }
 787
 788     if (self.sgrMouse) {
 789       pos.x -= 32;
 790       pos.y -= 32;
 791       self.send('\x1b[<'
 792                 + (((button & 3) === 3 ? button & ~3 : button) - 32)
 793                 + ';'
 794                 + pos.x
 795                 + ';'
 796                 + pos.y
 797                 + ((button & 3) === 3 ? 'm' : 'M'));
 798       return;
 799     }
 800
 801     var data = [];
 802
 803     encode(data, button);
 804     encode(data, pos.x);
 805     encode(data, pos.y);
 806
 807     self.send('\x1b[M' + String.fromCharCode.apply(String, data));
 808   }
 809
 810   function getButton(ev) {
 811     var button
 812     , shift
 813     , meta
 814     , ctrl
 815     , mod;
 816
 817     // two low bits:
 818     // 0 = left
 819     // 1 = middle
 820     // 2 = right
 821     // 3 = release
 822     // wheel up/down:
 823     // 1, and 2 - with 64 added
 824     switch (ev.overrideType || ev.type) {
 825       case 'mousedown':
 826         button = ev.button != null
 827           ? +ev.button
 828         : ev.which != null
 829           ? ev.which - 1
 830         : null;
 831
 832         if (self.browser.isMSIE) {
 833           button = button === 1 ? 0 : button === 4 ? 1 : button;
 834         }
 835         break;
 836       case 'mouseup':
 837         button = 3;
 838         break;
 839       case 'DOMMouseScroll':
 840         button = ev.detail < 0
 841           ? 64
 842         : 65;
 843         break;
 844       case 'wheel':
 845         button = ev.wheelDeltaY > 0
 846           ? 64
 847         : 65;
 848         break;
 849     }
 850
 851     // next three bits are the modifiers:
 852     // 4 = shift, 8 = meta, 16 = control
 853     shift = ev.shiftKey ? 4 : 0;
 854     meta = ev.metaKey ? 8 : 0;
 855     ctrl = ev.ctrlKey ? 16 : 0;
 856     mod = shift | meta | ctrl;
 857
 858     // no mods
 859     if (self.vt200Mouse) {
 860       // ctrl only
 861       mod &= ctrl;
 862     } else if (!self.normalMouse) {
 863       mod = 0;
 864     }
 865
 866     // increment to SP
 867     button = (32 + (mod << 2)) + button;
 868
 869     return button;
 870   }
 871
 872   // mouse coordinates measured in cols/rows
 873   function getCoords(ev) {
 874     var x, y, w, h, el;
 875
 876     // ignore browsers without pageX for now
 877     if (ev.pageX == null) return;
 878
 879     x = ev.pageX;
 880     y = ev.pageY;
 881     el = self.element;
 882
 883     // should probably check offsetParent
 884     // but this is more portable
 885     while (el && el !== self.document.documentElement) {
 886       x -= el.offsetLeft;
 887       y -= el.offsetTop;
 888       el = 'offsetParent' in el
 889         ? el.offsetParent
 890       : el.parentNode;
 891     }
 892
 893     // convert to cols/rows
 894     w = self.element.clientWidth;
 895     h = self.element.clientHeight;
 896     x = Math.ceil((x / w) * self.cols);
 897     y = Math.ceil((y / h) * self.rows);
 898
 899     // be sure to avoid sending
 900     // bad positions to the program
 901     if (x < 0) x = 0;
 902     if (x > self.cols) x = self.cols;
 903     if (y < 0) y = 0;
 904     if (y > self.rows) y = self.rows;
 905
 906     // xterm sends raw bytes and
 907     // starts at 32 (SP) for each.
 908     x += 32;
 909     y += 32;
 910
 911     return {
 912       x: x,
 913       y: y,
 914       type: 'wheel'
 915     };
 916   }
 917
 918   on(el, 'mousedown', function(ev) {
 919     if (!self.mouseEvents) return;
 920
 921     // send the button
 922     sendButton(ev);
 923
 924     // ensure focus
 925     self.focus();
 926
 927     // fix for odd bug
 928     //if (self.vt200Mouse && !self.normalMouse) {
 929     if (self.vt200Mouse) {
 930       ev.overrideType = 'mouseup';
 931       sendButton(ev);
 932       return self.cancel(ev);
 933     }
 934
 935     // bind events
 936     if (self.normalMouse) on(self.document, 'mousemove', sendMove);
 937
 938     // x10 compatibility mode can't send button releases
 939     if (!self.x10Mouse) {
 940       on(self.document, 'mouseup', function up(ev) {
 941         sendButton(ev);
 942         if (self.normalMouse) off(self.document, 'mousemove', sendMove);
 943         off(self.document, 'mouseup', up);
 944         return self.cancel(ev);
 945       });
 946     }
 947
 948     return self.cancel(ev);
 949   });
 950
 951   //if (self.normalMouse) {
 952   //  on(self.document, 'mousemove', sendMove);
 953   //}
 954
 955   on(el, 'wheel', function(ev) {
 956     if (!self.mouseEvents) return;
 957     if (self.x10Mouse
 958         || self.vt300Mouse
 959         || self.decLocator) return;
 960     sendButton(ev);
 961     return self.cancel(ev);
 962   });
 963
 964   // allow wheel scrolling in
 965   // the shell for example
 966   on(el, 'wheel', function(ev) {
 967     if (self.mouseEvents) return;
 968     self.viewport.onWheel(ev);
 969     return self.cancel(ev);
 970   });
 971 };
 972
 973 /**
 974  * Destroys the terminal.
 975  */
 976 Terminal.prototype.destroy = function() {
 977   this.readable = false;
 978   this.writable = false;
 979   this._events = {};
 980   this.handler = function() {};
 981   this.write = function() {};
 982   if (this.element.parentNode) {
 983     this.element.parentNode.removeChild(this.element);
 984   }
 985   //this.emit('close');
 986 };
 987
 988
 989 /**
 990  * Flags used to render terminal text properly
 991  */
 992 Terminal.flags = {
 993   BOLD: 1,
 994   UNDERLINE: 2,
 995   BLINK: 4,
 996   INVERSE: 8,
 997   INVISIBLE: 16
 998 }
 999
1000 /**
1001  * Refreshes (re-renders) terminal content within two rows (inclusive)
1002  *
1003  * Rendering Engine:
1004  *
1005  * In the screen buffer, each character is stored as a an array with a character
1006  * and a 32-bit integer:
1007  *   - First value: a utf-16 character.
1008  *   - Second value:
1009  *   - Next 9 bits: background color (0-511).
1010  *   - Next 9 bits: foreground color (0-511).
1011  *   - Next 14 bits: a mask for misc. flags:
1012  *     - 1=bold
1013  *     - 2=underline
1014  *     - 4=blink
1015  *     - 8=inverse
1016  *     - 16=invisible
1017  *
1018  * @param {number} start The row to start from (between 0 and terminal's height terminal - 1)
1019  * @param {number} end The row to end at (between fromRow and terminal's height terminal - 1)
1020  * @param {boolean} queue Whether the refresh should ran right now or be queued
1021  */
1022 Terminal.prototype.refresh = function(start, end, queue) {
1023   var self = this;
1024
1025   // queue defaults to true
1026   queue = (typeof queue == 'undefined') ? true : queue;
1027
1028   /**
1029    * The refresh queue allows refresh to execute only approximately 30 times a second. For
1030    * commands that pass a significant amount of output to the write function, this prevents the
1031    * terminal from maxing out the CPU and making the UI unresponsive. While commands can still
1032    * run beyond what they do on the terminal, it is far better with a debounce in place as
1033    * every single terminal manipulation does not need to be constructed in the DOM.
1034    *
1035    * A side-effect of this is that it makes ^C to interrupt a process seem more responsive.
1036    */
1037   if (queue) {
1038     // If refresh should be queued, order the refresh and return.
1039     if (this._refreshIsQueued) {
1040       // If a refresh has already been queued, just order a full refresh next
1041       this._fullRefreshNext = true;
1042     } else {
1043       setTimeout(function () {
1044         self.refresh(start, end, false);
1045       }, 34)
1046       this._refreshIsQueued = true;
1047     }
1048     return;
1049   }
1050
1051   // If refresh should be run right now (not be queued), release the lock
1052   this._refreshIsQueued = false;
1053
1054   // If multiple refreshes were requested, make a full refresh.
1055   if (this._fullRefreshNext) {
1056     start = 0;
1057     end = this.rows - 1;
1058     this._fullRefreshNext = false // reset lock
1059   }
1060
1061   var x, y, i, line, out, ch, ch_width, width, data, attr, bg, fg, flags, row, parent, focused = document.activeElement;
1062
1063   // If this is a big refresh, remove the terminal rows from the DOM for faster calculations
1064   if (end - start >= this.rows / 2) {
1065     parent = this.element.parentNode;
1066     if (parent) {
1067       this.element.removeChild(this.rowContainer);
1068     }
1069   }
1070
1071   width = this.cols;
1072   y = start;
1073
1074   if (end >= this.rows.length) {
1075     this.log('`end` is too large. Most likely a bad CSR.');
1076     end = this.rows.length - 1;
1077   }
1078
1079   for (; y <= end; y++) {
1080     row = y + this.ydisp;
1081
1082     line = this.lines.get(row);
1083     out = '';
1084
1085     if (this.y === y - (this.ybase - this.ydisp)
1086         && this.cursorState
1087         && !this.cursorHidden) {
1088       x = this.x;
1089     } else {
1090       x = -1;
1091     }
1092
1093     attr = this.defAttr;
1094     i = 0;
1095
1096     for (; i < width; i++) {
1097       data = line[i][0];
1098       ch = line[i][1];
1099       ch_width = line[i][2];
1100       if (!ch_width)
1101         continue;
1102
1103       if (i === x) data = -1;
1104
1105       if (data !== attr) {
1106         if (attr !== this.defAttr) {
1107           out += '</span>';
1108         }
1109         if (data !== this.defAttr) {
1110           if (data === -1) {
1111             out += '<span class="reverse-video terminal-cursor';
1112             if (this.cursorBlink) {
1113               out += ' blinking';
1114             }
1115             out += '">';
1116           } else {
1117             var classNames = [];
1118
1119             bg = data & 0x1ff;
1120             fg = (data >> 9) & 0x1ff;
1121             flags = data >> 18;
1122
1123             if (flags & Terminal.flags.BOLD) {
1124               if (!Terminal.brokenBold) {
1125                 classNames.push('xterm-bold');
1126               }
1127               // See: XTerm*boldColors
1128               if (fg < 8) fg += 8;
1129             }
1130
1131             if (flags & Terminal.flags.UNDERLINE) {
1132               classNames.push('xterm-underline');
1133             }
1134
1135             if (flags & Terminal.flags.BLINK) {
1136               classNames.push('xterm-blink');
1137             }
1138
1139             // If inverse flag is on, then swap the foreground and background variables.
1140             if (flags & Terminal.flags.INVERSE) {
1141               /* One-line variable swap in JavaScript: http://stackoverflow.com/a/16201730 */
1142               bg = [fg, fg = bg][0];
1143               // Should inverse just be before the
1144               // above boldColors effect instead?
1145               if ((flags & 1) && fg < 8) fg += 8;
1146             }
1147
1148             if (flags & Terminal.flags.INVISIBLE) {
1149               classNames.push('xterm-hidden');
1150             }
1151
1152             /**
1153              * Weird situation: Invert flag used black foreground and white background results
1154              * in invalid background color, positioned at the 256 index of the 256 terminal
1155              * color map. Pin the colors manually in such a case.
1156              *
1157              * Source: https://github.com/sourcelair/xterm.js/issues/57
1158              */
1159             if (flags & Terminal.flags.INVERSE) {
1160               if (bg == 257) {
1161                 bg = 15;
1162               }
1163               if (fg == 256) {
1164                 fg = 0;
1165               }
1166             }
1167
1168             if (bg < 256) {
1169               classNames.push('xterm-bg-color-' + bg);
1170             }
1171
1172             if (fg < 256) {
1173               classNames.push('xterm-color-' + fg);
1174             }
1175
1176             out += '<span';
1177             if (classNames.length) {
1178               out += ' class="' + classNames.join(' ') + '"';
1179             }
1180             out += '>';
1181           }
1182         }
1183       }
1184
1185       if (ch_width === 2) {
1186         out += '<span class="xterm-wide-char">';
1187       }
1188       switch (ch) {
1189         case '&':
1190           out += '&amp;';
1191           break;
1192         case '<':
1193           out += '&lt;';
1194           break;
1195         case '>':
1196           out += '&gt;';
1197           break;
1198         default:
1199           if (ch <= ' ') {
1200             out += '&nbsp;';
1201           } else {
1202             out += ch;
1203           }
1204           break;
1205       }
1206       if (ch_width === 2) {
1207         out += '</span>';
1208       }
1209
1210       attr = data;
1211     }
1212
1213     if (attr !== this.defAttr) {
1214       out += '</span>';
1215     }
1216
1217     this.children[y].innerHTML = out;
1218   }
1219
1220   if (parent) {
1221     this.element.appendChild(this.rowContainer);
1222   }
1223
1224   this.emit('refresh', {element: this.element, start: start, end: end});
1225 };
1226
1227 /**
1228  * Display the cursor element
1229  */
1230 Terminal.prototype.showCursor = function() {
1231   if (!this.cursorState) {
1232     this.cursorState = 1;
1233     this.refresh(this.y, this.y);
1234   }
1235 };
1236
1237 /**
1238  * Scroll the terminal down 1 row, creating a blank line.
1239  */
1240 Terminal.prototype.scroll = function() {
1241   var row;
1242
1243   this.ybase++;
1244
1245   // TODO: Why is this done twice?
1246   if (!this.userScrolling) {
1247     this.ydisp = this.ybase;
1248   }
1249
1250   // last line
1251   row = this.ybase + this.rows - 1;
1252
1253   // subtract the bottom scroll region
1254   row -= this.rows - 1 - this.scrollBottom;
1255
1256   if (row === this.lines.length) {
1257     // Compensate ybase and ydisp if lines has hit the maximum buffer size
1258     if (this.lines.length === this.lines.maxLength) {
1259       this.ybase--;
1260       if (this.ydisp !== 0) {
1261         this.ydisp--;
1262       }
1263     }
1264     // Optimization: pushing is faster than splicing when they amount to the same behavior
1265     this.lines.push(this.blankLine());
1266   } else {
1267     // add our new line
1268     this.lines.splice(row, 0, this.blankLine());
1269   }
1270
1271   if (this.scrollTop !== 0) {
1272     if (this.ybase !== 0) {
1273       this.ybase--;
1274       if (!this.userScrolling) {
1275         this.ydisp = this.ybase;
1276       }
1277     }
1278     this.lines.splice(this.ybase + this.scrollTop, 1);
1279   }
1280
1281   // this.maxRange();
1282   this.updateRange(this.scrollTop);
1283   this.updateRange(this.scrollBottom);
1284
1285   /**
1286    * This event is emitted whenever the terminal is scrolled.
1287    * The one parameter passed is the new y display position.
1288    *
1289    * @event scroll
1290    */
1291   this.emit('scroll', this.ydisp);
1292 };
1293
1294 /**
1295  * Scroll the display of the terminal
1296  * @param {number} disp The number of lines to scroll down (negatives scroll up).
1297  * @param {boolean} suppressScrollEvent Don't emit the scroll event as scrollDisp. This is used
1298  * to avoid unwanted events being handled by the veiwport when the event was triggered from the
1299  * viewport originally.
1300  */
1301 Terminal.prototype.scrollDisp = function(disp, suppressScrollEvent) {
1302   if (disp < 0) {
1303     this.userScrolling = true;
1304   } else if (disp + this.ydisp >= this.ybase) {
1305     this.userScrolling = false;
1306   }
1307
1308   this.ydisp += disp;
1309
1310   if (this.ydisp > this.ybase) {
1311     this.ydisp = this.ybase;
1312   } else if (this.ydisp < 0) {
1313     this.ydisp = 0;
1314   }
1315
1316   if (!suppressScrollEvent) {
1317     this.emit('scroll', this.ydisp);
1318   }
1319
1320   this.refresh(0, this.rows - 1);
1321 };
1322
1323 /**
1324  * Scroll the display of the terminal by a number of pages.
1325  * @param {number} pageCount The number of pages to scroll (negative scrolls up).
1326  */
1327 Terminal.prototype.scrollPages = function(pageCount) {
1328   this.scrollDisp(pageCount * (this.rows - 1));
1329 }
1330
1331 /**
1332  * Scrolls the display of the terminal to the top.
1333  */
1334 Terminal.prototype.scrollToTop = function() {
1335   this.scrollDisp(-this.ydisp);
1336 }
1337
1338 /**
1339  * Scrolls the display of the terminal to the bottom.
1340  */
1341 Terminal.prototype.scrollToBottom = function() {
1342   this.scrollDisp(this.ybase - this.ydisp);
1343 }
1344
1345 /**
1346  * Writes text to the terminal.
1347  * @param {string} text The text to write to the terminal.
1348  */
1349 Terminal.prototype.write = function(data) {
1350   var l = data.length, i = 0, j, cs, ch, code, low, ch_width, row;
1351
1352   this.refreshStart = this.y;
1353   this.refreshEnd = this.y;
1354
1355   // apply leftover surrogate high from last write
1356   if (this.surrogate_high) {
1357     data = this.surrogate_high + data;
1358     this.surrogate_high = '';
1359   }
1360
1361   for (; i < l; i++) {
1362     ch = data[i];
1363
1364     // FIXME: higher chars than 0xa0 are not allowed in escape sequences
1365     //        --> maybe move to default
1366     code = data.charCodeAt(i);
1367     if (0xD800 <= code && code <= 0xDBFF) {
1368       // we got a surrogate high
1369       // get surrogate low (next 2 bytes)
1370       low = data.charCodeAt(i+1);
1371       if (isNaN(low)) {
1372         // end of data stream, save surrogate high
1373         this.surrogate_high = ch;
1374         continue;
1375       }
1376       code = ((code - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;
1377       ch += data.charAt(i+1);
1378     }
1379     // surrogate low - already handled above
1380     if (0xDC00 <= code && code <= 0xDFFF)
1381       continue;
1382     switch (this.state) {
1383       case normal:
1384         switch (ch) {
1385           case '\x07':
1386             this.bell();
1387             break;
1388
1389           // '\n', '\v', '\f'
1390           case '\n':
1391           case '\x0b':
1392           case '\x0c':
1393             if (this.convertEol) {
1394               this.x = 0;
1395             }
1396             this.y++;
1397             if (this.y > this.scrollBottom) {
1398               this.y--;
1399               this.scroll();
1400             }
1401             break;
1402
1403           // '\r'
1404           case '\r':
1405             this.x = 0;
1406             break;
1407
1408           // '\b'
1409           case '\x08':
1410             if (this.x > 0) {
1411               this.x--;
1412             }
1413             break;
1414
1415           // '\t'
1416           case '\t':
1417             this.x = this.nextStop();
1418             break;
1419
1420           // shift out
1421           case '\x0e':
1422             this.setgLevel(1);
1423             break;
1424
1425           // shift in
1426           case '\x0f':
1427             this.setgLevel(0);
1428             break;
1429
1430           // '\e'
1431           case '\x1b':
1432             this.state = escaped;
1433             break;
1434
1435           default:
1436             // ' '
1437             // calculate print space
1438             // expensive call, therefore we save width in line buffer
1439             ch_width = wcwidth(code);
1440
1441             if (ch >= ' ') {
1442               if (this.charset && this.charset[ch]) {
1443                 ch = this.charset[ch];
1444               }
1445
1446               row = this.y + this.ybase;
1447
1448               // insert combining char in last cell
1449               // FIXME: needs handling after cursor jumps
1450               if (!ch_width && this.x) {
1451                 // dont overflow left
1452                 if (this.lines.get(row)[this.x-1]) {
1453                   if (!this.lines.get(row)[this.x-1][2]) {
1454
1455                     // found empty cell after fullwidth, need to go 2 cells back
1456                     if (this.lines.get(row)[this.x-2])
1457                       this.lines.get(row)[this.x-2][1] += ch;
1458
1459                   } else {
1460                     this.lines.get(row)[this.x-1][1] += ch;
1461                   }
1462                   this.updateRange(this.y);
1463                 }
1464                 break;
1465               }
1466
1467               // goto next line if ch would overflow
1468               // TODO: needs a global min terminal width of 2
1469               if (this.x+ch_width-1 >= this.cols) {
1470                 // autowrap - DECAWM
1471                 if (this.wraparoundMode) {
1472                   this.x = 0;
1473                   this.y++;
1474                   if (this.y > this.scrollBottom) {
1475                     this.y--;
1476                     this.scroll();
1477                   }
1478                 } else {
1479                   this.x = this.cols-1;
1480                   if(ch_width===2)  // FIXME: check for xterm behavior
1481                     continue;
1482                 }
1483               }
1484               row = this.y + this.ybase;
1485
1486               // insert mode: move characters to right
1487               if (this.insertMode) {
1488                 // do this twice for a fullwidth char
1489                 for (var moves=0; moves<ch_width; ++moves) {
1490                   // remove last cell, if it's width is 0
1491                   // we have to adjust the second last cell as well
1492                   var removed = this.lines.get(this.y + this.ybase).pop();
1493                   if (removed[2]===0
1494                       && this.lines.get(row)[this.cols-2]
1495                   && this.lines.get(row)[this.cols-2][2]===2)
1496                     this.lines.get(row)[this.cols-2] = [this.curAttr, ' ', 1];
1497
1498                   // insert empty cell at cursor
1499                   this.lines.get(row).splice(this.x, 0, [this.curAttr, ' ', 1]);
1500                 }
1501               }
1502
1503               this.lines.get(row)[this.x] = [this.curAttr, ch, ch_width];
1504               this.x++;
1505               this.updateRange(this.y);
1506
1507               // fullwidth char - set next cell width to zero and advance cursor
1508               if (ch_width===2) {
1509                 this.lines.get(row)[this.x] = [this.curAttr, '', 0];
1510                 this.x++;
1511               }
1512             }
1513             break;
1514         }
1515         break;
1516       case escaped:
1517         switch (ch) {
1518           // ESC [ Control Sequence Introducer ( CSI is 0x9b).
1519           case '[':
1520             this.params = [];
1521             this.currentParam = 0;
1522             this.state = csi;
1523             break;
1524
1525           // ESC ] Operating System Command ( OSC is 0x9d).
1526           case ']':
1527             this.params = [];
1528             this.currentParam = 0;
1529             this.state = osc;
1530             break;
1531
1532           // ESC P Device Control String ( DCS is 0x90).
1533           case 'P':
1534             this.params = [];
1535             this.currentParam = 0;
1536             this.state = dcs;
1537             break;
1538
1539           // ESC _ Application Program Command ( APC is 0x9f).
1540           case '_':
1541             this.state = ignore;
1542             break;
1543
1544           // ESC ^ Privacy Message ( PM is 0x9e).
1545           case '^':
1546             this.state = ignore;
1547             break;
1548
1549           // ESC c Full Reset (RIS).
1550           case 'c':
1551             this.reset();
1552             break;
1553
1554           // ESC E Next Line ( NEL is 0x85).
1555           // ESC D Index ( IND is 0x84).
1556           case 'E':
1557             this.x = 0;
1558             ;
1559           case 'D':
1560             this.index();
1561             break;
1562
1563           // ESC M Reverse Index ( RI is 0x8d).
1564           case 'M':
1565             this.reverseIndex();
1566             break;
1567
1568           // ESC % Select default/utf-8 character set.
1569           // @ = default, G = utf-8
1570           case '%':
1571             //this.charset = null;
1572             this.setgLevel(0);
1573             this.setgCharset(0, Terminal.charsets.US);
1574             this.state = normal;
1575             i++;
1576             break;
1577
1578           // ESC (,),*,+,-,. Designate G0-G2 Character Set.
1579           case '(': // <-- this seems to get all the attention
1580           case ')':
1581           case '*':
1582           case '+':
1583           case '-':
1584           case '.':
1585             switch (ch) {
1586               case '(':
1587                 this.gcharset = 0;
1588                 break;
1589               case ')':
1590                 this.gcharset = 1;
1591                 break;
1592               case '*':
1593                 this.gcharset = 2;
1594                 break;
1595               case '+':
1596                 this.gcharset = 3;
1597                 break;
1598               case '-':
1599                 this.gcharset = 1;
1600                 break;
1601               case '.':
1602                 this.gcharset = 2;
1603                 break;
1604             }
1605             this.state = charset;
1606             break;
1607
1608           // Designate G3 Character Set (VT300).
1609           // A = ISO Latin-1 Supplemental.
1610           // Not implemented.
1611           case '/':
1612             this.gcharset = 3;
1613             this.state = charset;
1614             i--;
1615             break;
1616
1617           // ESC N
1618           // Single Shift Select of G2 Character Set
1619           // ( SS2 is 0x8e). This affects next character only.
1620           case 'N':
1621             break;
1622           // ESC O
1623           // Single Shift Select of G3 Character Set
1624           // ( SS3 is 0x8f). This affects next character only.
1625           case 'O':
1626             break;
1627           // ESC n
1628           // Invoke the G2 Character Set as GL (LS2).
1629           case 'n':
1630             this.setgLevel(2);
1631             break;
1632           // ESC o
1633           // Invoke the G3 Character Set as GL (LS3).
1634           case 'o':
1635             this.setgLevel(3);
1636             break;
1637           // ESC |
1638           // Invoke the G3 Character Set as GR (LS3R).
1639           case '|':
1640             this.setgLevel(3);
1641             break;
1642           // ESC }
1643           // Invoke the G2 Character Set as GR (LS2R).
1644           case '}':
1645             this.setgLevel(2);
1646             break;
1647           // ESC ~
1648           // Invoke the G1 Character Set as GR (LS1R).
1649           case '~':
1650             this.setgLevel(1);
1651             break;
1652
1653           // ESC 7 Save Cursor (DECSC).
1654           case '7':
1655             this.saveCursor();
1656             this.state = normal;
1657             break;
1658
1659           // ESC 8 Restore Cursor (DECRC).
1660           case '8':
1661             this.restoreCursor();
1662             this.state = normal;
1663             break;
1664
1665           // ESC # 3 DEC line height/width
1666           case '#':
1667             this.state = normal;
1668             i++;
1669             break;
1670
1671           // ESC H Tab Set (HTS is 0x88).
1672           case 'H':
1673             this.tabSet();
1674             break;
1675
1676           // ESC = Application Keypad (DECKPAM).
1677           case '=':
1678             this.log('Serial port requested application keypad.');
1679             this.applicationKeypad = true;
1680             this.viewport.syncScrollArea();
1681             this.state = normal;
1682             break;
1683
1684           // ESC > Normal Keypad (DECKPNM).
1685           case '>':
1686             this.log('Switching back to normal keypad.');
1687             this.applicationKeypad = false;
1688             this.viewport.syncScrollArea();
1689             this.state = normal;
1690             break;
1691
1692           default:
1693             this.state = normal;
1694             this.error('Unknown ESC control: %s.', ch);
1695             break;
1696         }
1697         break;
1698
1699       case charset:
1700         switch (ch) {
1701           case '0': // DEC Special Character and Line Drawing Set.
1702             cs = Terminal.charsets.SCLD;
1703             break;
1704           case 'A': // UK
1705             cs = Terminal.charsets.UK;
1706             break;
1707           case 'B': // United States (USASCII).
1708             cs = Terminal.charsets.US;
1709             break;
1710           case '4': // Dutch
1711             cs = Terminal.charsets.Dutch;
1712             break;
1713           case 'C': // Finnish
1714           case '5':
1715             cs = Terminal.charsets.Finnish;
1716             break;
1717           case 'R': // French
1718             cs = Terminal.charsets.French;
1719             break;
1720           case 'Q': // FrenchCanadian
1721             cs = Terminal.charsets.FrenchCanadian;
1722             break;
1723           case 'K': // German
1724             cs = Terminal.charsets.German;
1725             break;
1726           case 'Y': // Italian
1727             cs = Terminal.charsets.Italian;
1728             break;
1729           case 'E': // NorwegianDanish
1730           case '6':
1731             cs = Terminal.charsets.NorwegianDanish;
1732             break;
1733           case 'Z': // Spanish
1734             cs = Terminal.charsets.Spanish;
1735             break;
1736           case 'H': // Swedish
1737           case '7':
1738             cs = Terminal.charsets.Swedish;
1739             break;
1740           case '=': // Swiss
1741             cs = Terminal.charsets.Swiss;
1742             break;
1743           case '/': // ISOLatin (actually /A)
1744             cs = Terminal.charsets.ISOLatin;
1745             i++;
1746             break;
1747           default: // Default
1748             cs = Terminal.charsets.US;
1749             break;
1750         }
1751         this.setgCharset(this.gcharset, cs);
1752         this.gcharset = null;
1753         this.state = normal;
1754         break;
1755
1756       case osc:
1757         // OSC Ps ; Pt ST
1758         // OSC Ps ; Pt BEL
1759         //   Set Text Parameters.
1760         if (ch === '\x1b' || ch === '\x07') {
1761           if (ch === '\x1b') i++;
1762
1763           this.params.push(this.currentParam);
1764
1765           switch (this.params[0]) {
1766             case 0:
1767             case 1:
1768             case 2:
1769               if (this.params[1]) {
1770                 this.title = this.params[1];
1771                 this.handleTitle(this.title);
1772               }
1773               break;
1774             case 3:
1775               // set X property
1776               break;
1777             case 4:
1778             case 5:
1779               // change dynamic colors
1780               break;
1781             case 10:
1782             case 11:
1783             case 12:
1784             case 13:
1785             case 14:
1786             case 15:
1787             case 16:
1788             case 17:
1789             case 18:
1790             case 19:
1791               // change dynamic ui colors
1792               break;
1793             case 46:
1794               // change log file
1795               break;
1796             case 50:
1797               // dynamic font
1798               break;
1799             case 51:
1800               // emacs shell
1801               break;
1802             case 52:
1803               // manipulate selection data
1804               break;
1805             case 104:
1806             case 105:
1807             case 110:
1808             case 111:
1809             case 112:
1810             case 113:
1811             case 114:
1812             case 115:
1813             case 116:
1814             case 117:
1815             case 118:
1816               // reset colors
1817               break;
1818           }
1819
1820           this.params = [];
1821           this.currentParam = 0;
1822           this.state = normal;
1823         } else {
1824           if (!this.params.length) {
1825             if (ch >= '0' && ch <= '9') {
1826               this.currentParam =
1827                 this.currentParam * 10 + ch.charCodeAt(0) - 48;
1828             } else if (ch === ';') {
1829               this.params.push(this.currentParam);
1830               this.currentParam = '';
1831             }
1832           } else {
1833             this.currentParam += ch;
1834           }
1835         }
1836         break;
1837
1838       case csi:
1839         // '?', '>', '!'
1840         if (ch === '?' || ch === '>' || ch === '!') {
1841           this.prefix = ch;
1842           break;
1843         }
1844
1845         // 0 - 9
1846         if (ch >= '0' && ch <= '9') {
1847           this.currentParam = this.currentParam * 10 + ch.charCodeAt(0) - 48;
1848           break;
1849         }
1850
1851         // '$', '"', ' ', '\''
1852         if (ch === '$' || ch === '"' || ch === ' ' || ch === '\'') {
1853           this.postfix = ch;
1854           break;
1855         }
1856
1857         this.params.push(this.currentParam);
1858         this.currentParam = 0;
1859
1860         // ';'
1861         if (ch === ';') break;
1862
1863         this.state = normal;
1864
1865         switch (ch) {
1866           // CSI Ps A
1867           // Cursor Up Ps Times (default = 1) (CUU).
1868           case 'A':
1869             this.cursorUp(this.params);
1870             break;
1871
1872           // CSI Ps B
1873           // Cursor Down Ps Times (default = 1) (CUD).
1874           case 'B':
1875             this.cursorDown(this.params);
1876             break;
1877
1878           // CSI Ps C
1879           // Cursor Forward Ps Times (default = 1) (CUF).
1880           case 'C':
1881             this.cursorForward(this.params);
1882             break;
1883
1884           // CSI Ps D
1885           // Cursor Backward Ps Times (default = 1) (CUB).
1886           case 'D':
1887             this.cursorBackward(this.params);
1888             break;
1889
1890           // CSI Ps ; Ps H
1891           // Cursor Position [row;column] (default = [1,1]) (CUP).
1892           case 'H':
1893             this.cursorPos(this.params);
1894             break;
1895
1896           // CSI Ps J  Erase in Display (ED).
1897           case 'J':
1898             this.eraseInDisplay(this.params);
1899             break;
1900
1901           // CSI Ps K  Erase in Line (EL).
1902           case 'K':
1903             this.eraseInLine(this.params);
1904             break;
1905
1906           // CSI Pm m  Character Attributes (SGR).
1907           case 'm':
1908             if (!this.prefix) {
1909               this.charAttributes(this.params);
1910             }
1911             break;
1912
1913           // CSI Ps n  Device Status Report (DSR).
1914           case 'n':
1915             if (!this.prefix) {
1916               this.deviceStatus(this.params);
1917             }
1918             break;
1919
1920             /**
1921              * Additions
1922              */
1923
1924           // CSI Ps @
1925           // Insert Ps (Blank) Character(s) (default = 1) (ICH).
1926           case '@':
1927             this.insertChars(this.params);
1928             break;
1929
1930           // CSI Ps E
1931           // Cursor Next Line Ps Times (default = 1) (CNL).
1932           case 'E':
1933             this.cursorNextLine(this.params);
1934             break;
1935
1936           // CSI Ps F
1937           // Cursor Preceding Line Ps Times (default = 1) (CNL).
1938           case 'F':
1939             this.cursorPrecedingLine(this.params);
1940             break;
1941
1942           // CSI Ps G
1943           // Cursor Character Absolute  [column] (default = [row,1]) (CHA).
1944           case 'G':
1945             this.cursorCharAbsolute(this.params);
1946             break;
1947
1948           // CSI Ps L
1949           // Insert Ps Line(s) (default = 1) (IL).
1950           case 'L':
1951             this.insertLines(this.params);
1952             break;
1953
1954           // CSI Ps M
1955           // Delete Ps Line(s) (default = 1) (DL).
1956           case 'M':
1957             this.deleteLines(this.params);
1958             break;
1959
1960           // CSI Ps P
1961           // Delete Ps Character(s) (default = 1) (DCH).
1962           case 'P':
1963             this.deleteChars(this.params);
1964             break;
1965
1966           // CSI Ps X
1967           // Erase Ps Character(s) (default = 1) (ECH).
1968           case 'X':
1969             this.eraseChars(this.params);
1970             break;
1971
1972           // CSI Pm `  Character Position Absolute
1973           //   [column] (default = [row,1]) (HPA).
1974           case '`':
1975             this.charPosAbsolute(this.params);
1976             break;
1977
1978           // 141 61 a * HPR -
1979           // Horizontal Position Relative
1980           case 'a':
1981             this.HPositionRelative(this.params);
1982             break;
1983
1984           // CSI P s c
1985           // Send Device Attributes (Primary DA).
1986           // CSI > P s c
1987           // Send Device Attributes (Secondary DA)
1988           case 'c':
1989             this.sendDeviceAttributes(this.params);
1990             break;
1991
1992           // CSI Pm d
1993           // Line Position Absolute  [row] (default = [1,column]) (VPA).
1994           case 'd':
1995             this.linePosAbsolute(this.params);
1996             break;
1997
1998           // 145 65 e * VPR - Vertical Position Relative
1999           case 'e':
2000             this.VPositionRelative(this.params);
2001             break;
2002
2003           // CSI Ps ; Ps f
2004           //   Horizontal and Vertical Position [row;column] (default =
2005           //   [1,1]) (HVP).
2006           case 'f':
2007             this.HVPosition(this.params);
2008             break;
2009
2010           // CSI Pm h  Set Mode (SM).
2011           // CSI ? Pm h - mouse escape codes, cursor escape codes
2012           case 'h':
2013             this.setMode(this.params);
2014             break;
2015
2016           // CSI Pm l  Reset Mode (RM).
2017           // CSI ? Pm l
2018           case 'l':
2019             this.resetMode(this.params);
2020             break;
2021
2022           // CSI Ps ; Ps r
2023           //   Set Scrolling Region [top;bottom] (default = full size of win-
2024           //   dow) (DECSTBM).
2025           // CSI ? Pm r
2026           case 'r':
2027             this.setScrollRegion(this.params);
2028             break;
2029
2030           // CSI s
2031           //   Save cursor (ANSI.SYS).
2032           case 's':
2033             this.saveCursor(this.params);
2034             break;
2035
2036           // CSI u
2037           //   Restore cursor (ANSI.SYS).
2038           case 'u':
2039             this.restoreCursor(this.params);
2040             break;
2041
2042             /**
2043              * Lesser Used
2044              */
2045
2046           // CSI Ps I
2047           // Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
2048           case 'I':
2049             this.cursorForwardTab(this.params);
2050             break;
2051
2052           // CSI Ps S  Scroll up Ps lines (default = 1) (SU).
2053           case 'S':
2054             this.scrollUp(this.params);
2055             break;
2056
2057           // CSI Ps T  Scroll down Ps lines (default = 1) (SD).
2058           // CSI Ps ; Ps ; Ps ; Ps ; Ps T
2059           // CSI > Ps; Ps T
2060           case 'T':
2061             // if (this.prefix === '>') {
2062             //   this.resetTitleModes(this.params);
2063             //   break;
2064             // }
2065             // if (this.params.length > 2) {
2066             //   this.initMouseTracking(this.params);
2067             //   break;
2068             // }
2069             if (this.params.length < 2 && !this.prefix) {
2070               this.scrollDown(this.params);
2071             }
2072             break;
2073
2074           // CSI Ps Z
2075           // Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
2076           case 'Z':
2077             this.cursorBackwardTab(this.params);
2078             break;
2079
2080           // CSI Ps b  Repeat the preceding graphic character Ps times (REP).
2081           case 'b':
2082             this.repeatPrecedingCharacter(this.params);
2083             break;
2084
2085           // CSI Ps g  Tab Clear (TBC).
2086           case 'g':
2087             this.tabClear(this.params);
2088             break;
2089
2090             // CSI Pm i  Media Copy (MC).
2091             // CSI ? Pm i
2092             // case 'i':
2093             //   this.mediaCopy(this.params);
2094             //   break;
2095
2096             // CSI Pm m  Character Attributes (SGR).
2097             // CSI > Ps; Ps m
2098             // case 'm': // duplicate
2099             //   if (this.prefix === '>') {
2100             //     this.setResources(this.params);
2101             //   } else {
2102             //     this.charAttributes(this.params);
2103             //   }
2104             //   break;
2105
2106             // CSI Ps n  Device Status Report (DSR).
2107             // CSI > Ps n
2108             // case 'n': // duplicate
2109             //   if (this.prefix === '>') {
2110             //     this.disableModifiers(this.params);
2111             //   } else {
2112             //     this.deviceStatus(this.params);
2113             //   }
2114             //   break;
2115
2116             // CSI > Ps p  Set pointer mode.
2117             // CSI ! p   Soft terminal reset (DECSTR).
2118             // CSI Ps$ p
2119             //   Request ANSI mode (DECRQM).
2120             // CSI ? Ps$ p
2121             //   Request DEC private mode (DECRQM).
2122             // CSI Ps ; Ps " p
2123           case 'p':
2124             switch (this.prefix) {
2125                 // case '>':
2126                 //   this.setPointerMode(this.params);
2127                 //   break;
2128               case '!':
2129                 this.softReset(this.params);
2130                 break;
2131                 // case '?':
2132                 //   if (this.postfix === '$') {
2133                 //     this.requestPrivateMode(this.params);
2134                 //   }
2135                 //   break;
2136                 // default:
2137                 //   if (this.postfix === '"') {
2138                 //     this.setConformanceLevel(this.params);
2139                 //   } else if (this.postfix === '$') {
2140                 //     this.requestAnsiMode(this.params);
2141                 //   }
2142                 //   break;
2143             }
2144             break;
2145
2146             // CSI Ps q  Load LEDs (DECLL).
2147             // CSI Ps SP q
2148             // CSI Ps " q
2149             // case 'q':
2150             //   if (this.postfix === ' ') {
2151             //     this.setCursorStyle(this.params);
2152             //     break;
2153             //   }
2154             //   if (this.postfix === '"') {
2155             //     this.setCharProtectionAttr(this.params);
2156             //     break;
2157             //   }
2158             //   this.loadLEDs(this.params);
2159             //   break;
2160
2161             // CSI Ps ; Ps r
2162             //   Set Scrolling Region [top;bottom] (default = full size of win-
2163             //   dow) (DECSTBM).
2164             // CSI ? Pm r
2165             // CSI Pt; Pl; Pb; Pr; Ps$ r
2166             // case 'r': // duplicate
2167             //   if (this.prefix === '?') {
2168             //     this.restorePrivateValues(this.params);
2169             //   } else if (this.postfix === '$') {
2170             //     this.setAttrInRectangle(this.params);
2171             //   } else {
2172             //     this.setScrollRegion(this.params);
2173             //   }
2174             //   break;
2175
2176             // CSI s     Save cursor (ANSI.SYS).
2177             // CSI ? Pm s
2178             // case 's': // duplicate
2179             //   if (this.prefix === '?') {
2180             //     this.savePrivateValues(this.params);
2181             //   } else {
2182             //     this.saveCursor(this.params);
2183             //   }
2184             //   break;
2185
2186             // CSI Ps ; Ps ; Ps t
2187             // CSI Pt; Pl; Pb; Pr; Ps$ t
2188             // CSI > Ps; Ps t
2189             // CSI Ps SP t
2190             // case 't':
2191             //   if (this.postfix === '$') {
2192             //     this.reverseAttrInRectangle(this.params);
2193             //   } else if (this.postfix === ' ') {
2194             //     this.setWarningBellVolume(this.params);
2195             //   } else {
2196             //     if (this.prefix === '>') {
2197             //       this.setTitleModeFeature(this.params);
2198             //     } else {
2199             //       this.manipulateWindow(this.params);
2200             //     }
2201             //   }
2202             //   break;
2203
2204             // CSI u     Restore cursor (ANSI.SYS).
2205             // CSI Ps SP u
2206             // case 'u': // duplicate
2207             //   if (this.postfix === ' ') {
2208             //     this.setMarginBellVolume(this.params);
2209             //   } else {
2210             //     this.restoreCursor(this.params);
2211             //   }
2212             //   break;
2213
2214             // CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
2215             // case 'v':
2216             //   if (this.postfix === '$') {
2217             //     this.copyRectagle(this.params);
2218             //   }
2219             //   break;
2220
2221             // CSI Pt ; Pl ; Pb ; Pr ' w
2222             // case 'w':
2223             //   if (this.postfix === '\'') {
2224             //     this.enableFilterRectangle(this.params);
2225             //   }
2226             //   break;
2227
2228             // CSI Ps x  Request Terminal Parameters (DECREQTPARM).
2229             // CSI Ps x  Select Attribute Change Extent (DECSACE).
2230             // CSI Pc; Pt; Pl; Pb; Pr$ x
2231             // case 'x':
2232             //   if (this.postfix === '$') {
2233             //     this.fillRectangle(this.params);
2234             //   } else {
2235             //     this.requestParameters(this.params);
2236             //     //this.__(this.params);
2237             //   }
2238             //   break;
2239
2240             // CSI Ps ; Pu ' z
2241             // CSI Pt; Pl; Pb; Pr$ z
2242             // case 'z':
2243             //   if (this.postfix === '\'') {
2244             //     this.enableLocatorReporting(this.params);
2245             //   } else if (this.postfix === '$') {
2246             //     this.eraseRectangle(this.params);
2247             //   }
2248             //   break;
2249
2250             // CSI Pm ' {
2251             // CSI Pt; Pl; Pb; Pr$ {
2252             // case '{':
2253             //   if (this.postfix === '\'') {
2254             //     this.setLocatorEvents(this.params);
2255             //   } else if (this.postfix === '$') {
2256             //     this.selectiveEraseRectangle(this.params);
2257             //   }
2258             //   break;
2259
2260             // CSI Ps ' |
2261             // case '|':
2262             //   if (this.postfix === '\'') {
2263             //     this.requestLocatorPosition(this.params);
2264             //   }
2265             //   break;
2266
2267             // CSI P m SP }
2268             // Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
2269             // case '}':
2270             //   if (this.postfix === ' ') {
2271             //     this.insertColumns(this.params);
2272             //   }
2273             //   break;
2274
2275             // CSI P m SP ~
2276             // Delete P s Column(s) (default = 1) (DECDC), VT420 and up
2277             // case '~':
2278             //   if (this.postfix === ' ') {
2279             //     this.deleteColumns(this.params);
2280             //   }
2281             //   break;
2282
2283           default:
2284             this.error('Unknown CSI code: %s.', ch);
2285             break;
2286         }
2287
2288         this.prefix = '';
2289         this.postfix = '';
2290         break;
2291
2292       case dcs:
2293         if (ch === '\x1b' || ch === '\x07') {
2294           if (ch === '\x1b') i++;
2295
2296           switch (this.prefix) {
2297             // User-Defined Keys (DECUDK).
2298             case '':
2299               break;
2300
2301             // Request Status String (DECRQSS).
2302             // test: echo -e '\eP$q"p\e\\'
2303             case '$q':
2304               var pt = this.currentParam
2305               , valid = false;
2306
2307               switch (pt) {
2308                 // DECSCA
2309                 case '"q':
2310                   pt = '0"q';
2311                   break;
2312
2313                 // DECSCL
2314                 case '"p':
2315                   pt = '61"p';
2316                   break;
2317
2318                 // DECSTBM
2319                 case 'r':
2320                   pt = ''
2321                     + (this.scrollTop + 1)
2322                     + ';'
2323                     + (this.scrollBottom + 1)
2324                     + 'r';
2325                   break;
2326
2327                 // SGR
2328                 case 'm':
2329                   pt = '0m';
2330                   break;
2331
2332                 default:
2333                   this.error('Unknown DCS Pt: %s.', pt);
2334                   pt = '';
2335                   break;
2336               }
2337
2338               this.send('\x1bP' + +valid + '$r' + pt + '\x1b\\');
2339               break;
2340
2341             // Set Termcap/Terminfo Data (xterm, experimental).
2342             case '+p':
2343               break;
2344
2345             // Request Termcap/Terminfo String (xterm, experimental)
2346             // Regular xterm does not even respond to this sequence.
2347             // This can cause a small glitch in vim.
2348             // test: echo -ne '\eP+q6b64\e\\'
2349             case '+q':
2350               var pt = this.currentParam
2351               , valid = false;
2352
2353               this.send('\x1bP' + +valid + '+r' + pt + '\x1b\\');
2354               break;
2355
2356             default:
2357               this.error('Unknown DCS prefix: %s.', this.prefix);
2358               break;
2359           }
2360
2361           this.currentParam = 0;
2362           this.prefix = '';
2363           this.state = normal;
2364         } else if (!this.currentParam) {
2365           if (!this.prefix && ch !== '$' && ch !== '+') {
2366             this.currentParam = ch;
2367           } else if (this.prefix.length === 2) {
2368             this.currentParam = ch;
2369           } else {
2370             this.prefix += ch;
2371           }
2372         } else {
2373           this.currentParam += ch;
2374         }
2375         break;
2376
2377       case ignore:
2378         // For PM and APC.
2379         if (ch === '\x1b' || ch === '\x07') {
2380           if (ch === '\x1b') i++;
2381           this.state = normal;
2382         }
2383         break;
2384     }
2385   }
2386
2387   this.updateRange(this.y);
2388   this.refresh(this.refreshStart, this.refreshEnd);
2389 };
2390
2391 /**
2392  * Writes text to the terminal, followed by a break line character (\n).
2393  * @param {string} text The text to write to the terminal.
2394  */
2395 Terminal.prototype.writeln = function(data) {
2396   this.write(data + '\r\n');
2397 };
2398
2399 /**
2400  * Attaches a custom keydown handler which is run before keys are processed, giving consumers of
2401  * xterm.js ultimate control as to what keys should be processed by the terminal and what keys
2402  * should not.
2403  * @param {function} customKeydownHandler The custom KeyboardEvent handler to attach. This is a
2404  *   function that takes a KeyboardEvent, allowing consumers to stop propogation and/or prevent
2405  *   the default action. The function returns whether the event should be processed by xterm.js.
2406  */
2407 Terminal.prototype.attachCustomKeydownHandler = function(customKeydownHandler) {
2408   this.customKeydownHandler = customKeydownHandler;
2409 }
2410
2411 /**
2412  * Handle a keydown event
2413  * Key Resources:
2414  *   - https://developer.mozilla.org/en-US/docs/DOM/KeyboardEvent
2415  * @param {KeyboardEvent} ev The keydown event to be handled.
2416  */
2417 Terminal.prototype.keyDown = function(ev) {
2418   if (this.customKeydownHandler && this.customKeydownHandler(ev) === false) {
2419     return false;
2420   }
2421
2422   if (!this.compositionHelper.keydown.bind(this.compositionHelper)(ev)) {
2423     if (this.ybase !== this.ydisp) {
2424       this.scrollToBottom();
2425     }
2426     return false;
2427   }
2428
2429   var self = this;
2430   var result = this.evaluateKeyEscapeSequence(ev);
2431
2432   if (result.scrollDisp) {
2433     this.scrollDisp(result.scrollDisp);
2434     return this.cancel(ev, true);
2435   }
2436
2437   if (isThirdLevelShift(this, ev)) {
2438     return true;
2439   }
2440
2441   if (result.cancel) {
2442     // The event is canceled at the end already, is this necessary?
2443     this.cancel(ev, true);
2444   }
2445
2446   if (!result.key) {
2447     return true;
2448   }
2449
2450   this.emit('keydown', ev);
2451   this.emit('key', result.key, ev);
2452   this.showCursor();
2453   this.handler(result.key);
2454
2455   return this.cancel(ev, true);
2456 };
2457
2458 /**
2459  * Returns an object that determines how a KeyboardEvent should be handled. The key of the
2460  * returned value is the new key code to pass to the PTY.
2461  *
2462  * Reference: http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
2463  * @param {KeyboardEvent} ev The keyboard event to be translated to key escape sequence.
2464  */
2465 Terminal.prototype.evaluateKeyEscapeSequence = function(ev) {
2466   var result = {
2467     // Whether to cancel event propogation (NOTE: this may not be needed since the event is
2468     // canceled at the end of keyDown
2469     cancel: false,
2470     // The new key even to emit
2471     key: undefined,
2472     // The number of characters to scroll, if this is defined it will cancel the event
2473     scrollDisp: undefined
2474   };
2475   var modifiers = ev.shiftKey << 0 | ev.altKey << 1 | ev.ctrlKey << 2 | ev.metaKey << 3;
2476   switch (ev.keyCode) {
2477     case 8:
2478       // backspace
2479       if (ev.shiftKey) {
2480         result.key = '\x08'; // ^H
2481         break;
2482       }
2483       result.key = '\x7f'; // ^?
2484       break;
2485     case 9:
2486       // tab
2487       if (ev.shiftKey) {
2488         result.key = '\x1b[Z';
2489         break;
2490       }
2491       result.key = '\t';
2492       result.cancel = true;
2493       break;
2494     case 13:
2495       // return/enter
2496       result.key = '\r';
2497       result.cancel = true;
2498       break;
2499     case 27:
2500       // escape
2501       result.key = '\x1b';
2502       result.cancel = true;
2503       break;
2504     case 37:
2505       // left-arrow
2506       if (modifiers) {
2507         result.key = '\x1b[1;' + (modifiers + 1) + 'D';
2508         // HACK: Make Alt + left-arrow behave like Ctrl + left-arrow: move one word backwards
2509         // http://unix.stackexchange.com/a/108106
2510         // macOS uses different escape sequences than linux
2511         if (result.key == '\x1b[1;3D') {
2512           result.key = (this.browser.isMac) ? '\x1bb' : '\x1b[1;5D';
2513         }
2514       } else if (this.applicationCursor) {
2515         result.key = '\x1bOD';
2516       } else {
2517         result.key = '\x1b[D';
2518       }
2519       break;
2520     case 39:
2521       // right-arrow
2522       if (modifiers) {
2523         result.key = '\x1b[1;' + (modifiers + 1) + 'C';
2524         // HACK: Make Alt + right-arrow behave like Ctrl + right-arrow: move one word forward
2525         // http://unix.stackexchange.com/a/108106
2526         // macOS uses different escape sequences than linux
2527         if (result.key == '\x1b[1;3C') {
2528           result.key = (this.browser.isMac) ? '\x1bf' : '\x1b[1;5C';
2529         }
2530       } else if (this.applicationCursor) {
2531         result.key = '\x1bOC';
2532       } else {
2533         result.key = '\x1b[C';
2534       }
2535       break;
2536     case 38:
2537       // up-arrow
2538       if (modifiers) {
2539         result.key = '\x1b[1;' + (modifiers + 1) + 'A';
2540         // HACK: Make Alt + up-arrow behave like Ctrl + up-arrow
2541         // http://unix.stackexchange.com/a/108106
2542         if (result.key == '\x1b[1;3A') {
2543           result.key = '\x1b[1;5A';
2544         }
2545       } else if (this.applicationCursor) {
2546         result.key = '\x1bOA';
2547       } else {
2548         result.key = '\x1b[A';
2549       }
2550       break;
2551     case 40:
2552       // down-arrow
2553       if (modifiers) {
2554         result.key = '\x1b[1;' + (modifiers + 1) + 'B';
2555         // HACK: Make Alt + down-arrow behave like Ctrl + down-arrow
2556         // http://unix.stackexchange.com/a/108106
2557         if (result.key == '\x1b[1;3B') {
2558           result.key = '\x1b[1;5B';
2559         }
2560       } else if (this.applicationCursor) {
2561         result.key = '\x1bOB';
2562       } else {
2563         result.key = '\x1b[B';
2564       }
2565       break;
2566     case 45:
2567       // insert
2568       if (!ev.shiftKey && !ev.ctrlKey) {
2569         // <Ctrl> or <Shift> + <Insert> are used to
2570         // copy-paste on some systems.
2571         result.key = '\x1b[2~';
2572       }
2573       break;
2574     case 46:
2575       // delete
2576       if (modifiers) {
2577         result.key = '\x1b[3;' + (modifiers + 1) + '~';
2578       } else {
2579         result.key = '\x1b[3~';
2580       }
2581       break;
2582     case 36:
2583       // home
2584       if (modifiers)
2585         result.key = '\x1b[1;' + (modifiers + 1) + 'H';
2586       else if (this.applicationCursor)
2587         result.key = '\x1bOH';
2588       else
2589         result.key = '\x1b[H';
2590       break;
2591     case 35:
2592       // end
2593       if (modifiers)
2594         result.key = '\x1b[1;' + (modifiers + 1) + 'F';
2595       else if (this.applicationCursor)
2596         result.key = '\x1bOF';
2597       else
2598         result.key = '\x1b[F';
2599       break;
2600     case 33:
2601       // page up
2602       if (ev.shiftKey) {
2603         result.scrollDisp = -(this.rows - 1);
2604       } else {
2605         result.key = '\x1b[5~';
2606       }
2607       break;
2608     case 34:
2609       // page down
2610       if (ev.shiftKey) {
2611         result.scrollDisp = this.rows - 1;
2612       } else {
2613         result.key = '\x1b[6~';
2614       }
2615       break;
2616     case 112:
2617       // F1-F12
2618       if (modifiers) {
2619         result.key = '\x1b[1;' + (modifiers + 1) + 'P';
2620       } else {
2621         result.key = '\x1bOP';
2622       }
2623       break;
2624     case 113:
2625       if (modifiers) {
2626         result.key = '\x1b[1;' + (modifiers + 1) + 'Q';
2627       } else {
2628         result.key = '\x1bOQ';
2629       }
2630       break;
2631     case 114:
2632       if (modifiers) {
2633         result.key = '\x1b[1;' + (modifiers + 1) + 'R';
2634       } else {
2635         result.key = '\x1bOR';
2636       }
2637       break;
2638     case 115:
2639       if (modifiers) {
2640         result.key = '\x1b[1;' + (modifiers + 1) + 'S';
2641       } else {
2642         result.key = '\x1bOS';
2643       }
2644       break;
2645     case 116:
2646       if (modifiers) {
2647         result.key = '\x1b[15;' + (modifiers + 1) + '~';
2648       } else {
2649         result.key = '\x1b[15~';
2650       }
2651       break;
2652     case 117:
2653       if (modifiers) {
2654         result.key = '\x1b[17;' + (modifiers + 1) + '~';
2655       } else {
2656         result.key = '\x1b[17~';
2657       }
2658       break;
2659     case 118:
2660       if (modifiers) {
2661         result.key = '\x1b[18;' + (modifiers + 1) + '~';
2662       } else {
2663         result.key = '\x1b[18~';
2664       }
2665       break;
2666     case 119:
2667       if (modifiers) {
2668         result.key = '\x1b[19;' + (modifiers + 1) + '~';
2669       } else {
2670         result.key = '\x1b[19~';
2671       }
2672       break;
2673     case 120:
2674       if (modifiers) {
2675         result.key = '\x1b[20;' + (modifiers + 1) + '~';
2676       } else {
2677         result.key = '\x1b[20~';
2678       }
2679       break;
2680     case 121:
2681       if (modifiers) {
2682         result.key = '\x1b[21;' + (modifiers + 1) + '~';
2683       } else {
2684         result.key = '\x1b[21~';
2685       }
2686       break;
2687     case 122:
2688       if (modifiers) {
2689         result.key = '\x1b[23;' + (modifiers + 1) + '~';
2690       } else {
2691         result.key = '\x1b[23~';
2692       }
2693       break;
2694     case 123:
2695       if (modifiers) {
2696         result.key = '\x1b[24;' + (modifiers + 1) + '~';
2697       } else {
2698         result.key = '\x1b[24~';
2699       }
2700       break;
2701     default:
2702       // a-z and space
2703       if (ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {
2704         if (ev.keyCode >= 65 && ev.keyCode <= 90) {
2705           result.key = String.fromCharCode(ev.keyCode - 64);
2706         } else if (ev.keyCode === 32) {
2707           // NUL
2708           result.key = String.fromCharCode(0);
2709         } else if (ev.keyCode >= 51 && ev.keyCode <= 55) {
2710           // escape, file sep, group sep, record sep, unit sep
2711           result.key = String.fromCharCode(ev.keyCode - 51 + 27);
2712         } else if (ev.keyCode === 56) {
2713           // delete
2714           result.key = String.fromCharCode(127);
2715         } else if (ev.keyCode === 219) {
2716           // ^[ - Control Sequence Introducer (CSI)
2717           result.key = String.fromCharCode(27);
2718         } else if (ev.keyCode === 220) {
2719           // ^\ - String Terminator (ST)
2720           result.key = String.fromCharCode(28);
2721         } else if (ev.keyCode === 221) {
2722           // ^] - Operating System Command (OSC)
2723           result.key = String.fromCharCode(29);
2724         }
2725       } else if (!this.browser.isMac && ev.altKey && !ev.ctrlKey && !ev.metaKey) {
2726         // On Mac this is a third level shift. Use <Esc> instead.
2727         if (ev.keyCode >= 65 && ev.keyCode <= 90) {
2728           result.key = '\x1b' + String.fromCharCode(ev.keyCode + 32);
2729         } else if (ev.keyCode === 192) {
2730           result.key = '\x1b`';
2731         } else if (ev.keyCode >= 48 && ev.keyCode <= 57) {
2732           result.key = '\x1b' + (ev.keyCode - 48);
2733         }
2734       }
2735       break;
2736   }
2737   return result;
2738 };
2739
2740 /**
2741  * Set the G level of the terminal
2742  * @param g
2743  */
2744 Terminal.prototype.setgLevel = function(g) {
2745   this.glevel = g;
2746   this.charset = this.charsets[g];
2747 };
2748
2749 /**
2750  * Set the charset for the given G level of the terminal
2751  * @param g
2752  * @param charset
2753  */
2754 Terminal.prototype.setgCharset = function(g, charset) {
2755   this.charsets[g] = charset;
2756   if (this.glevel === g) {
2757     this.charset = charset;
2758   }
2759 };
2760
2761 /**
2762  * Handle a keypress event.
2763  * Key Resources:
2764  *   - https://developer.mozilla.org/en-US/docs/DOM/KeyboardEvent
2765  * @param {KeyboardEvent} ev The keypress event to be handled.
2766  */
2767 Terminal.prototype.keyPress = function(ev) {
2768   var key;
2769
2770   this.cancel(ev);
2771
2772   if (ev.charCode) {
2773     key = ev.charCode;
2774   } else if (ev.which == null) {
2775     key = ev.keyCode;
2776   } else if (ev.which !== 0 && ev.charCode !== 0) {
2777     key = ev.which;
2778   } else {
2779     return false;
2780   }
2781
2782   if (!key || (
2783     (ev.altKey || ev.ctrlKey || ev.metaKey) && !isThirdLevelShift(this, ev)
2784   )) {
2785     return false;
2786   }
2787
2788   key = String.fromCharCode(key);
2789
2790   this.emit('keypress', key, ev);
2791   this.emit('key', key, ev);
2792   this.showCursor();
2793   this.handler(key);
2794
2795   return false;
2796 };
2797
2798 /**
2799  * Send data for handling to the terminal
2800  * @param {string} data
2801  */
2802 Terminal.prototype.send = function(data) {
2803   var self = this;
2804
2805   if (!this.queue) {
2806     setTimeout(function() {
2807       self.handler(self.queue);
2808       self.queue = '';
2809     }, 1);
2810   }
2811
2812   this.queue += data;
2813 };
2814
2815 /**
2816  * Ring the bell.
2817  * Note: We could do sweet things with webaudio here
2818  */
2819 Terminal.prototype.bell = function() {
2820   if (!this.visualBell) return;
2821   var self = this;
2822   this.element.style.borderColor = 'white';
2823   setTimeout(function() {
2824     self.element.style.borderColor = '';
2825   }, 10);
2826   if (this.popOnBell) this.focus();
2827 };
2828
2829 /**
2830  * Log the current state to the console.
2831  */
2832 Terminal.prototype.log = function() {
2833   if (!this.debug) return;
2834   if (!this.context.console || !this.context.console.log) return;
2835   var args = Array.prototype.slice.call(arguments);
2836   this.context.console.log.apply(this.context.console, args);
2837 };
2838
2839 /**
2840  * Log the current state as error to the console.
2841  */
2842 Terminal.prototype.error = function() {
2843   if (!this.debug) return;
2844   if (!this.context.console || !this.context.console.error) return;
2845   var args = Array.prototype.slice.call(arguments);
2846   this.context.console.error.apply(this.context.console, args);
2847 };
2848
2849 /**
2850  * Resizes the terminal.
2851  *
2852  * @param {number} x The number of columns to resize to.
2853  * @param {number} y The number of rows to resize to.
2854  */
2855 Terminal.prototype.resize = function(x, y) {
2856   var line
2857   , el
2858   , i
2859   , j
2860   , ch
2861   , addToY;
2862
2863   if (x === this.cols && y === this.rows) {
2864     return;
2865   }
2866
2867   if (x < 1) x = 1;
2868   if (y < 1) y = 1;
2869
2870   // resize cols
2871   j = this.cols;
2872   if (j < x) {
2873     ch = [this.defAttr, ' ', 1]; // does xterm use the default attr?
2874     i = this.lines.length;
2875     while (i--) {
2876       while (this.lines.get(i).length < x) {
2877         this.lines.get(i).push(ch);
2878       }
2879     }
2880   } else { // (j > x)
2881     i = this.lines.length;
2882     while (i--) {
2883       while (this.lines.get(i).length > x) {
2884         this.lines.get(i).pop();
2885       }
2886     }
2887   }
2888   this.setupStops(j);
2889   this.cols = x;
2890
2891   // resize rows
2892   j = this.rows;
2893   addToY = 0;
2894   if (j < y) {
2895     el = this.element;
2896     while (j++ < y) {
2897       // y is rows, not this.y
2898       if (this.lines.length < y + this.ybase) {
2899         if (this.ybase > 0 && this.lines.length <= this.ybase + this.y + addToY + 1) {
2900           // There is room above the buffer and there are no empty elements below the line,
2901           // scroll up
2902           this.ybase--;
2903           addToY++
2904           if (this.ydisp > 0) {
2905             // Viewport is at the top of the buffer, must increase downwards
2906             this.ydisp--;
2907           }
2908         } else {
2909           // Add a blank line if there is no buffer left at the top to scroll to, or if there
2910           // are blank lines after the cursor
2911           this.lines.push(this.blankLine());
2912         }
2913       }
2914       if (this.children.length < y) {
2915         this.insertRow();
2916       }
2917     }
2918   } else { // (j > y)
2919     while (j-- > y) {
2920       if (this.lines.length > y + this.ybase) {
2921         if (this.lines.length > this.ybase + this.y + 1) {
2922           // The line is a blank line below the cursor, remove it
2923           this.lines.pop();
2924         } else {
2925           // The line is the cursor, scroll down
2926           this.ybase++;
2927           this.ydisp++;
2928         }
2929       }
2930       if (this.children.length > y) {
2931         el = this.children.shift();
2932         if (!el) continue;
2933         el.parentNode.removeChild(el);
2934       }
2935     }
2936   }
2937   this.rows = y;
2938
2939   // Make sure that the cursor stays on screen
2940   if (this.y >= y) {
2941     this.y = y - 1;
2942   }
2943   if (addToY) {
2944     this.y += addToY;
2945   }
2946
2947   if (this.x >= x) {
2948     this.x = x - 1;
2949   }
2950
2951   this.scrollTop = 0;
2952   this.scrollBottom = y - 1;
2953
2954   this.refresh(0, this.rows - 1);
2955
2956   this.normal = null;
2957
2958   this.geometry = [this.cols, this.rows];
2959   this.emit('resize', {terminal: this, cols: x, rows: y});
2960 };
2961
2962 /**
2963  * Updates the range of rows to refresh
2964  * @param {number} y The number of rows to refresh next.
2965  */
2966 Terminal.prototype.updateRange = function(y) {
2967   if (y < this.refreshStart) this.refreshStart = y;
2968   if (y > this.refreshEnd) this.refreshEnd = y;
2969   // if (y > this.refreshEnd) {
2970   //   this.refreshEnd = y;
2971   //   if (y > this.rows - 1) {
2972   //     this.refreshEnd = this.rows - 1;
2973   //   }
2974   // }
2975 };
2976
2977 /**
2978  * Set the range of refreshing to the maximum value
2979  */
2980 Terminal.prototype.maxRange = function() {
2981   this.refreshStart = 0;
2982   this.refreshEnd = this.rows - 1;
2983 };
2984
2985
2986
2987 /**
2988  * Setup the tab stops.
2989  * @param {number} i
2990  */
2991 Terminal.prototype.setupStops = function(i) {
2992   if (i != null) {
2993     if (!this.tabs[i]) {
2994       i = this.prevStop(i);
2995     }
2996   } else {
2997     this.tabs = {};
2998     i = 0;
2999   }
3000
3001   for (; i < this.cols; i += 8) {
3002     this.tabs[i] = true;
3003   }
3004 };
3005
3006
3007 /**
3008  * Move the cursor to the previous tab stop from the given position (default is current).
3009  * @param {number} x The position to move the cursor to the previous tab stop.
3010  */
3011 Terminal.prototype.prevStop = function(x) {
3012   if (x == null) x = this.x;
3013   while (!this.tabs[--x] && x > 0);
3014   return x >= this.cols
3015     ? this.cols - 1
3016   : x < 0 ? 0 : x;
3017 };
3018
3019
3020 /**
3021  * Move the cursor one tab stop forward from the given position (default is current).
3022  * @param {number} x The position to move the cursor one tab stop forward.
3023  */
3024 Terminal.prototype.nextStop = function(x) {
3025   if (x == null) x = this.x;
3026   while (!this.tabs[++x] && x < this.cols);
3027   return x >= this.cols
3028     ? this.cols - 1
3029   : x < 0 ? 0 : x;
3030 };
3031
3032
3033 /**
3034  * Erase in the identified line everything from "x" to the end of the line (right).
3035  * @param {number} x The column from which to start erasing to the end of the line.
3036  * @param {number} y The line in which to operate.
3037  */
3038 Terminal.prototype.eraseRight = function(x, y) {
3039   var line = this.lines.get(this.ybase + y)
3040   , ch = [this.eraseAttr(), ' ', 1]; // xterm
3041
3042
3043   for (; x < this.cols; x++) {
3044     line[x] = ch;
3045   }
3046
3047   this.updateRange(y);
3048 };
3049
3050
3051
3052 /**
3053  * Erase in the identified line everything from "x" to the start of the line (left).
3054  * @param {number} x The column from which to start erasing to the start of the line.
3055  * @param {number} y The line in which to operate.
3056  */
3057 Terminal.prototype.eraseLeft = function(x, y) {
3058   var line = this.lines.get(this.ybase + y)
3059   , ch = [this.eraseAttr(), ' ', 1]; // xterm
3060
3061   x++;
3062   while (x--) line[x] = ch;
3063
3064   this.updateRange(y);
3065 };
3066
3067 /**
3068  * Clears the entire buffer, making the prompt line the new first line.
3069  */
3070 Terminal.prototype.clear = function() {
3071   if (this.ybase === 0 && this.y === 0) {
3072     // Don't clear if it's already clear
3073     return;
3074   }
3075   this.lines.set(0, this.lines.get(this.ybase + this.y));
3076   this.lines.length = 1;
3077   this.ydisp = 0;
3078   this.ybase = 0;
3079   this.y = 0;
3080   for (var i = 1; i < this.rows; i++) {
3081     this.lines.push(this.blankLine());
3082   }
3083   this.refresh(0, this.rows - 1);
3084   this.emit('scroll', this.ydisp);
3085 };
3086
3087 /**
3088  * Erase all content in the given line
3089  * @param {number} y The line to erase all of its contents.
3090  */
3091 Terminal.prototype.eraseLine = function(y) {
3092   this.eraseRight(0, y);
3093 };
3094
3095
3096 /**
3097  * Return the data array of a blank line
3098  * @param {number} cur First bunch of data for each "blank" character.
3099  */
3100 Terminal.prototype.blankLine = function(cur) {
3101   var attr = cur
3102   ? this.eraseAttr()
3103   : this.defAttr;
3104
3105   var ch = [attr, ' ', 1]  // width defaults to 1 halfwidth character
3106   , line = []
3107   , i = 0;
3108
3109   for (; i < this.cols; i++) {
3110     line[i] = ch;
3111   }
3112
3113   return line;
3114 };
3115
3116
3117 /**
3118  * If cur return the back color xterm feature attribute. Else return defAttr.
3119  * @param {object} cur
3120  */
3121 Terminal.prototype.ch = function(cur) {
3122   return cur
3123     ? [this.eraseAttr(), ' ', 1]
3124   : [this.defAttr, ' ', 1];
3125 };
3126
3127
3128 /**
3129  * Evaluate if the current erminal is the given argument.
3130  * @param {object} term The terminal to evaluate
3131  */
3132 Terminal.prototype.is = function(term) {
3133   var name = this.termName;
3134   return (name + '').indexOf(term) === 0;
3135 };
3136
3137
3138 /**
3139  * Emit the 'data' event and populate the given data.
3140  * @param {string} data The data to populate in the event.
3141  */
3142 Terminal.prototype.handler = function(data) {
3143   // Input is being sent to the terminal, the terminal should focus the prompt.
3144   if (this.ybase !== this.ydisp) {
3145     this.scrollToBottom();
3146   }
3147   this.emit('data', data);
3148 };
3149
3150
3151 /**
3152  * Emit the 'title' event and populate the given title.
3153  * @param {string} title The title to populate in the event.
3154  */
3155 Terminal.prototype.handleTitle = function(title) {
3156   /**
3157    * This event is emitted when the title of the terminal is changed
3158    * from inside the terminal. The parameter is the new title.
3159    *
3160    * @event title
3161    */
3162   this.emit('title', title);
3163 };
3164
3165
3166 /**
3167  * ESC
3168  */
3169
3170 /**
3171  * ESC D Index (IND is 0x84).
3172  */
3173 Terminal.prototype.index = function() {
3174   this.y++;
3175   if (this.y > this.scrollBottom) {
3176     this.y--;
3177     this.scroll();
3178   }
3179   this.state = normal;
3180 };
3181
3182
3183 /**
3184  * ESC M Reverse Index (RI is 0x8d).
3185  *
3186  * Move the cursor up one row, inserting a new blank line if necessary.
3187  */
3188 Terminal.prototype.reverseIndex = function() {
3189   var j;
3190   if (this.y === this.scrollTop) {
3191     // possibly move the code below to term.reverseScroll();
3192     // test: echo -ne '\e[1;1H\e[44m\eM\e[0m'
3193     // blankLine(true) is xterm/linux behavior
3194     this.lines.shiftElements(this.y + this.ybase, this.rows - 1, 1);
3195     this.lines.set(this.y + this.ybase, this.blankLine(true));
3196     this.updateRange(this.scrollTop);
3197     this.updateRange(this.scrollBottom);
3198   } else {
3199     this.y--;
3200   }
3201   this.state = normal;
3202 };
3203
3204
3205 /**
3206  * ESC c Full Reset (RIS).
3207  */
3208 Terminal.prototype.reset = function() {
3209   this.options.rows = this.rows;
3210   this.options.cols = this.cols;
3211   var customKeydownHandler = this.customKeydownHandler;
3212   Terminal.call(this, this.options);
3213   this.customKeydownHandler = customKeydownHandler;
3214   this.refresh(0, this.rows - 1);
3215   this.viewport.syncScrollArea();
3216 };
3217
3218
3219 /**
3220  * ESC H Tab Set (HTS is 0x88).
3221  */
3222 Terminal.prototype.tabSet = function() {
3223   this.tabs[this.x] = true;
3224   this.state = normal;
3225 };
3226
3227
3228 /**
3229  * CSI
3230  */
3231
3232 /**
3233  * CSI Ps A
3234  * Cursor Up Ps Times (default = 1) (CUU).
3235  */
3236 Terminal.prototype.cursorUp = function(params) {
3237   var param = params[0];
3238   if (param < 1) param = 1;
3239   this.y -= param;
3240   if (this.y < 0) this.y = 0;
3241 };
3242
3243
3244 /**
3245  * CSI Ps B
3246  * Cursor Down Ps Times (default = 1) (CUD).
3247  */
3248 Terminal.prototype.cursorDown = function(params) {
3249   var param = params[0];
3250   if (param < 1) param = 1;
3251   this.y += param;
3252   if (this.y >= this.rows) {
3253     this.y = this.rows - 1;
3254   }
3255 };
3256
3257
3258 /**
3259  * CSI Ps C
3260  * Cursor Forward Ps Times (default = 1) (CUF).
3261  */
3262 Terminal.prototype.cursorForward = function(params) {
3263   var param = params[0];
3264   if (param < 1) param = 1;
3265   this.x += param;
3266   if (this.x >= this.cols) {
3267     this.x = this.cols - 1;
3268   }
3269 };
3270
3271
3272 /**
3273  * CSI Ps D
3274  * Cursor Backward Ps Times (default = 1) (CUB).
3275  */
3276 Terminal.prototype.cursorBackward = function(params) {
3277   var param = params[0];
3278   if (param < 1) param = 1;
3279   this.x -= param;
3280   if (this.x < 0) this.x = 0;
3281 };
3282
3283
3284 /**
3285  * CSI Ps ; Ps H
3286  * Cursor Position [row;column] (default = [1,1]) (CUP).
3287  */
3288 Terminal.prototype.cursorPos = function(params) {
3289   var row, col;
3290
3291   row = params[0] - 1;
3292
3293   if (params.length >= 2) {
3294     col = params[1] - 1;
3295   } else {
3296     col = 0;
3297   }
3298
3299   if (row < 0) {
3300     row = 0;
3301   } else if (row >= this.rows) {
3302     row = this.rows - 1;
3303   }
3304
3305   if (col < 0) {
3306     col = 0;
3307   } else if (col >= this.cols) {
3308     col = this.cols - 1;
3309   }
3310
3311   this.x = col;
3312   this.y = row;
3313 };
3314
3315
3316 /**
3317  * CSI Ps J  Erase in Display (ED).
3318  *     Ps = 0  -> Erase Below (default).
3319  *     Ps = 1  -> Erase Above.
3320  *     Ps = 2  -> Erase All.
3321  *     Ps = 3  -> Erase Saved Lines (xterm).
3322  * CSI ? Ps J
3323  *   Erase in Display (DECSED).
3324  *     Ps = 0  -> Selective Erase Below (default).
3325  *     Ps = 1  -> Selective Erase Above.
3326  *     Ps = 2  -> Selective Erase All.
3327  */
3328 Terminal.prototype.eraseInDisplay = function(params) {
3329   var j;
3330   switch (params[0]) {
3331     case 0:
3332       this.eraseRight(this.x, this.y);
3333       j = this.y + 1;
3334       for (; j < this.rows; j++) {
3335         this.eraseLine(j);
3336       }
3337       break;
3338     case 1:
3339       this.eraseLeft(this.x, this.y);
3340       j = this.y;
3341       while (j--) {
3342         this.eraseLine(j);
3343       }
3344       break;
3345     case 2:
3346       j = this.rows;
3347       while (j--) this.eraseLine(j);
3348       break;
3349     case 3:
3350       ; // no saved lines
3351       break;
3352   }
3353 };
3354
3355
3356 /**
3357  * CSI Ps K  Erase in Line (EL).
3358  *     Ps = 0  -> Erase to Right (default).
3359  *     Ps = 1  -> Erase to Left.
3360  *     Ps = 2  -> Erase All.
3361  * CSI ? Ps K
3362  *   Erase in Line (DECSEL).
3363  *     Ps = 0  -> Selective Erase to Right (default).
3364  *     Ps = 1  -> Selective Erase to Left.
3365  *     Ps = 2  -> Selective Erase All.
3366  */
3367 Terminal.prototype.eraseInLine = function(params) {
3368   switch (params[0]) {
3369     case 0:
3370       this.eraseRight(this.x, this.y);
3371       break;
3372     case 1:
3373       this.eraseLeft(this.x, this.y);
3374       break;
3375     case 2:
3376       this.eraseLine(this.y);
3377       break;
3378   }
3379 };
3380
3381
3382 /**
3383  * CSI Pm m  Character Attributes (SGR).
3384  *     Ps = 0  -> Normal (default).
3385  *     Ps = 1  -> Bold.
3386  *     Ps = 4  -> Underlined.
3387  *     Ps = 5  -> Blink (appears as Bold).
3388  *     Ps = 7  -> Inverse.
3389  *     Ps = 8  -> Invisible, i.e., hidden (VT300).
3390  *     Ps = 2 2  -> Normal (neither bold nor faint).
3391  *     Ps = 2 4  -> Not underlined.
3392  *     Ps = 2 5  -> Steady (not blinking).
3393  *     Ps = 2 7  -> Positive (not inverse).
3394  *     Ps = 2 8  -> Visible, i.e., not hidden (VT300).
3395  *     Ps = 3 0  -> Set foreground color to Black.
3396  *     Ps = 3 1  -> Set foreground color to Red.
3397  *     Ps = 3 2  -> Set foreground color to Green.
3398  *     Ps = 3 3  -> Set foreground color to Yellow.
3399  *     Ps = 3 4  -> Set foreground color to Blue.
3400  *     Ps = 3 5  -> Set foreground color to Magenta.
3401  *     Ps = 3 6  -> Set foreground color to Cyan.
3402  *     Ps = 3 7  -> Set foreground color to White.
3403  *     Ps = 3 9  -> Set foreground color to default (original).
3404  *     Ps = 4 0  -> Set background color to Black.
3405  *     Ps = 4 1  -> Set background color to Red.
3406  *     Ps = 4 2  -> Set background color to Green.
3407  *     Ps = 4 3  -> Set background color to Yellow.
3408  *     Ps = 4 4  -> Set background color to Blue.
3409  *     Ps = 4 5  -> Set background color to Magenta.
3410  *     Ps = 4 6  -> Set background color to Cyan.
3411  *     Ps = 4 7  -> Set background color to White.
3412  *     Ps = 4 9  -> Set background color to default (original).
3413  *
3414  *   If 16-color support is compiled, the following apply.  Assume
3415  *   that xterm's resources are set so that the ISO color codes are
3416  *   the first 8 of a set of 16.  Then the aixterm colors are the
3417  *   bright versions of the ISO colors:
3418  *     Ps = 9 0  -> Set foreground color to Black.
3419  *     Ps = 9 1  -> Set foreground color to Red.
3420  *     Ps = 9 2  -> Set foreground color to Green.
3421  *     Ps = 9 3  -> Set foreground color to Yellow.
3422  *     Ps = 9 4  -> Set foreground color to Blue.
3423  *     Ps = 9 5  -> Set foreground color to Magenta.
3424  *     Ps = 9 6  -> Set foreground color to Cyan.
3425  *     Ps = 9 7  -> Set foreground color to White.
3426  *     Ps = 1 0 0  -> Set background color to Black.
3427  *     Ps = 1 0 1  -> Set background color to Red.
3428  *     Ps = 1 0 2  -> Set background color to Green.
3429  *     Ps = 1 0 3  -> Set background color to Yellow.
3430  *     Ps = 1 0 4  -> Set background color to Blue.
3431  *     Ps = 1 0 5  -> Set background color to Magenta.
3432  *     Ps = 1 0 6  -> Set background color to Cyan.
3433  *     Ps = 1 0 7  -> Set background color to White.
3434  *
3435  *   If xterm is compiled with the 16-color support disabled, it
3436  *   supports the following, from rxvt:
3437  *     Ps = 1 0 0  -> Set foreground and background color to
3438  *     default.
3439  *
3440  *   If 88- or 256-color support is compiled, the following apply.
3441  *     Ps = 3 8  ; 5  ; Ps -> Set foreground color to the second
3442  *     Ps.
3443  *     Ps = 4 8  ; 5  ; Ps -> Set background color to the second
3444  *     Ps.
3445  */
3446 Terminal.prototype.charAttributes = function(params) {
3447   // Optimize a single SGR0.
3448   if (params.length === 1 && params[0] === 0) {
3449     this.curAttr = this.defAttr;
3450     return;
3451   }
3452
3453   var l = params.length
3454   , i = 0
3455   , flags = this.curAttr >> 18
3456   , fg = (this.curAttr >> 9) & 0x1ff
3457   , bg = this.curAttr & 0x1ff
3458   , p;
3459
3460   for (; i < l; i++) {
3461     p = params[i];
3462     if (p >= 30 && p <= 37) {
3463       // fg color 8
3464       fg = p - 30;
3465     } else if (p >= 40 && p <= 47) {
3466       // bg color 8
3467       bg = p - 40;
3468     } else if (p >= 90 && p <= 97) {
3469       // fg color 16
3470       p += 8;
3471       fg = p - 90;
3472     } else if (p >= 100 && p <= 107) {
3473       // bg color 16
3474       p += 8;
3475       bg = p - 100;
3476     } else if (p === 0) {
3477       // default
3478       flags = this.defAttr >> 18;
3479       fg = (this.defAttr >> 9) & 0x1ff;
3480       bg = this.defAttr & 0x1ff;
3481       // flags = 0;
3482       // fg = 0x1ff;
3483       // bg = 0x1ff;
3484     } else if (p === 1) {
3485       // bold text
3486       flags |= 1;
3487     } else if (p === 4) {
3488       // underlined text
3489       flags |= 2;
3490     } else if (p === 5) {
3491       // blink
3492       flags |= 4;
3493     } else if (p === 7) {
3494       // inverse and positive
3495       // test with: echo -e '\e[31m\e[42mhello\e[7mworld\e[27mhi\e[m'
3496       flags |= 8;
3497     } else if (p === 8) {
3498       // invisible
3499       flags |= 16;
3500     } else if (p === 22) {
3501       // not bold
3502       flags &= ~1;
3503     } else if (p === 24) {
3504       // not underlined
3505       flags &= ~2;
3506     } else if (p === 25) {
3507       // not blink
3508       flags &= ~4;
3509     } else if (p === 27) {
3510       // not inverse
3511       flags &= ~8;
3512     } else if (p === 28) {
3513       // not invisible
3514       flags &= ~16;
3515     } else if (p === 39) {
3516       // reset fg
3517       fg = (this.defAttr >> 9) & 0x1ff;
3518     } else if (p === 49) {
3519       // reset bg
3520       bg = this.defAttr & 0x1ff;
3521     } else if (p === 38) {
3522       // fg color 256
3523       if (params[i + 1] === 2) {
3524         i += 2;
3525         fg = matchColor(
3526           params[i] & 0xff,
3527           params[i + 1] & 0xff,
3528           params[i + 2] & 0xff);
3529         if (fg === -1) fg = 0x1ff;
3530         i += 2;
3531       } else if (params[i + 1] === 5) {
3532         i += 2;
3533         p = params[i] & 0xff;
3534         fg = p;
3535       }
3536     } else if (p === 48) {
3537       // bg color 256
3538       if (params[i + 1] === 2) {
3539         i += 2;
3540         bg = matchColor(
3541           params[i] & 0xff,
3542           params[i + 1] & 0xff,
3543           params[i + 2] & 0xff);
3544         if (bg === -1) bg = 0x1ff;
3545         i += 2;
3546       } else if (params[i + 1] === 5) {
3547         i += 2;
3548         p = params[i] & 0xff;
3549         bg = p;
3550       }
3551     } else if (p === 100) {
3552       // reset fg/bg
3553       fg = (this.defAttr >> 9) & 0x1ff;
3554       bg = this.defAttr & 0x1ff;
3555     } else {
3556       this.error('Unknown SGR attribute: %d.', p);
3557     }
3558   }
3559
3560   this.curAttr = (flags << 18) | (fg << 9) | bg;
3561 };
3562
3563
3564 /**
3565  * CSI Ps n  Device Status Report (DSR).
3566  *     Ps = 5  -> Status Report.  Result (``OK'') is
3567  *   CSI 0 n
3568  *     Ps = 6  -> Report Cursor Position (CPR) [row;column].
3569  *   Result is
3570  *   CSI r ; c R
3571  * CSI ? Ps n
3572  *   Device Status Report (DSR, DEC-specific).
3573  *     Ps = 6  -> Report Cursor Position (CPR) [row;column] as CSI
3574  *     ? r ; c R (assumes page is zero).
3575  *     Ps = 1 5  -> Report Printer status as CSI ? 1 0  n  (ready).
3576  *     or CSI ? 1 1  n  (not ready).
3577  *     Ps = 2 5  -> Report UDK status as CSI ? 2 0  n  (unlocked)
3578  *     or CSI ? 2 1  n  (locked).
3579  *     Ps = 2 6  -> Report Keyboard status as
3580  *   CSI ? 2 7  ;  1  ;  0  ;  0  n  (North American).
3581  *   The last two parameters apply to VT400 & up, and denote key-
3582  *   board ready and LK01 respectively.
3583  *     Ps = 5 3  -> Report Locator status as
3584  *   CSI ? 5 3  n  Locator available, if compiled-in, or
3585  *   CSI ? 5 0  n  No Locator, if not.
3586  */
3587 Terminal.prototype.deviceStatus = function(params) {
3588   if (!this.prefix) {
3589     switch (params[0]) {
3590       case 5:
3591         // status report
3592         this.send('\x1b[0n');
3593         break;
3594       case 6:
3595         // cursor position
3596         this.send('\x1b['
3597                   + (this.y + 1)
3598                   + ';'
3599                   + (this.x + 1)
3600                   + 'R');
3601         break;
3602     }
3603   } else if (this.prefix === '?') {
3604     // modern xterm doesnt seem to
3605     // respond to any of these except ?6, 6, and 5
3606     switch (params[0]) {
3607       case 6:
3608         // cursor position
3609         this.send('\x1b[?'
3610                   + (this.y + 1)
3611                   + ';'
3612                   + (this.x + 1)
3613                   + 'R');
3614         break;
3615       case 15:
3616         // no printer
3617         // this.send('\x1b[?11n');
3618         break;
3619       case 25:
3620         // dont support user defined keys
3621         // this.send('\x1b[?21n');
3622         break;
3623       case 26:
3624         // north american keyboard
3625         // this.send('\x1b[?27;1;0;0n');
3626         break;
3627       case 53:
3628         // no dec locator/mouse
3629         // this.send('\x1b[?50n');
3630         break;
3631     }
3632   }
3633 };
3634
3635
3636 /**
3637  * Additions
3638  */
3639
3640 /**
3641  * CSI Ps @
3642  * Insert Ps (Blank) Character(s) (default = 1) (ICH).
3643  */
3644 Terminal.prototype.insertChars = function(params) {
3645   var param, row, j, ch;
3646
3647   param = params[0];
3648   if (param < 1) param = 1;
3649
3650   row = this.y + this.ybase;
3651   j = this.x;
3652   ch = [this.eraseAttr(), ' ', 1]; // xterm
3653
3654   while (param-- && j < this.cols) {
3655     this.lines.get(row).splice(j++, 0, ch);
3656     this.lines.get(row).pop();
3657   }
3658 };
3659
3660 /**
3661  * CSI Ps E
3662  * Cursor Next Line Ps Times (default = 1) (CNL).
3663  * same as CSI Ps B ?
3664  */
3665 Terminal.prototype.cursorNextLine = function(params) {
3666   var param = params[0];
3667   if (param < 1) param = 1;
3668   this.y += param;
3669   if (this.y >= this.rows) {
3670     this.y = this.rows - 1;
3671   }
3672   this.x = 0;
3673 };
3674
3675
3676 /**
3677  * CSI Ps F
3678  * Cursor Preceding Line Ps Times (default = 1) (CNL).
3679  * reuse CSI Ps A ?
3680  */
3681 Terminal.prototype.cursorPrecedingLine = function(params) {
3682   var param = params[0];
3683   if (param < 1) param = 1;
3684   this.y -= param;
3685   if (this.y < 0) this.y = 0;
3686   this.x = 0;
3687 };
3688
3689
3690 /**
3691  * CSI Ps G
3692  * Cursor Character Absolute  [column] (default = [row,1]) (CHA).
3693  */
3694 Terminal.prototype.cursorCharAbsolute = function(params) {
3695   var param = params[0];
3696   if (param < 1) param = 1;
3697   this.x = param - 1;
3698 };
3699
3700
3701 /**
3702  * CSI Ps L
3703  * Insert Ps Line(s) (default = 1) (IL).
3704  */
3705 Terminal.prototype.insertLines = function(params) {
3706   var param, row, j;
3707
3708   param = params[0];
3709   if (param < 1) param = 1;
3710   row = this.y + this.ybase;
3711
3712   j = this.rows - 1 - this.scrollBottom;
3713   j = this.rows - 1 + this.ybase - j + 1;
3714
3715   while (param--) {
3716     if (this.lines.length === this.lines.maxLength) {
3717       // Trim the start of lines to make room for the new line
3718       this.lines.trimStart(1);
3719       this.ybase--;
3720       this.ydisp--;
3721       row--;
3722       j--;
3723     }
3724     // test: echo -e '\e[44m\e[1L\e[0m'
3725     // blankLine(true) - xterm/linux behavior
3726     this.lines.splice(row, 0, this.blankLine(true));
3727     this.lines.splice(j, 1);
3728   }
3729
3730   // this.maxRange();
3731   this.updateRange(this.y);
3732   this.updateRange(this.scrollBottom);
3733 };
3734
3735
3736 /**
3737  * CSI Ps M
3738  * Delete Ps Line(s) (default = 1) (DL).
3739  */
3740 Terminal.prototype.deleteLines = function(params) {
3741   var param, row, j;
3742
3743   param = params[0];
3744   if (param < 1) param = 1;
3745   row = this.y + this.ybase;
3746
3747   j = this.rows - 1 - this.scrollBottom;
3748   j = this.rows - 1 + this.ybase - j;
3749
3750   while (param--) {
3751     if (this.lines.length === this.lines.maxLength) {
3752       // Trim the start of lines to make room for the new line
3753       this.lines.trimStart(1);
3754       this.ybase -= 1;
3755       this.ydisp -= 1;
3756     }
3757     // test: echo -e '\e[44m\e[1M\e[0m'
3758     // blankLine(true) - xterm/linux behavior
3759     this.lines.splice(j + 1, 0, this.blankLine(true));
3760     this.lines.splice(row, 1);
3761   }
3762
3763   // this.maxRange();
3764   this.updateRange(this.y);
3765   this.updateRange(this.scrollBottom);
3766 };
3767
3768
3769 /**
3770  * CSI Ps P
3771  * Delete Ps Character(s) (default = 1) (DCH).
3772  */
3773 Terminal.prototype.deleteChars = function(params) {
3774   var param, row, ch;
3775
3776   param = params[0];
3777   if (param < 1) param = 1;
3778
3779   row = this.y + this.ybase;
3780   ch = [this.eraseAttr(), ' ', 1]; // xterm
3781
3782   while (param--) {
3783     this.lines.get(row).splice(this.x, 1);
3784     this.lines.get(row).push(ch);
3785   }
3786 };
3787
3788 /**
3789  * CSI Ps X
3790  * Erase Ps Character(s) (default = 1) (ECH).
3791  */
3792 Terminal.prototype.eraseChars = function(params) {
3793   var param, row, j, ch;
3794
3795   param = params[0];
3796   if (param < 1) param = 1;
3797
3798   row = this.y + this.ybase;
3799   j = this.x;
3800   ch = [this.eraseAttr(), ' ', 1]; // xterm
3801
3802   while (param-- && j < this.cols) {
3803     this.lines.get(row)[j++] = ch;
3804   }
3805 };
3806
3807 /**
3808  * CSI Pm `  Character Position Absolute
3809  *   [column] (default = [row,1]) (HPA).
3810  */
3811 Terminal.prototype.charPosAbsolute = function(params) {
3812   var param = params[0];
3813   if (param < 1) param = 1;
3814   this.x = param - 1;
3815   if (this.x >= this.cols) {
3816     this.x = this.cols - 1;
3817   }
3818 };
3819
3820
3821 /**
3822  * 141 61 a * HPR -
3823  * Horizontal Position Relative
3824  * reuse CSI Ps C ?
3825  */
3826 Terminal.prototype.HPositionRelative = function(params) {
3827   var param = params[0];
3828   if (param < 1) param = 1;
3829   this.x += param;
3830   if (this.x >= this.cols) {
3831     this.x = this.cols - 1;
3832   }
3833 };
3834
3835
3836 /**
3837  * CSI Ps c  Send Device Attributes (Primary DA).
3838  *     Ps = 0  or omitted -> request attributes from terminal.  The
3839  *     response depends on the decTerminalID resource setting.
3840  *     -> CSI ? 1 ; 2 c  (``VT100 with Advanced Video Option'')
3841  *     -> CSI ? 1 ; 0 c  (``VT101 with No Options'')
3842  *     -> CSI ? 6 c  (``VT102'')
3843  *     -> CSI ? 6 0 ; 1 ; 2 ; 6 ; 8 ; 9 ; 1 5 ; c  (``VT220'')
3844  *   The VT100-style response parameters do not mean anything by
3845  *   themselves.  VT220 parameters do, telling the host what fea-
3846  *   tures the terminal supports:
3847  *     Ps = 1  -> 132-columns.
3848  *     Ps = 2  -> Printer.
3849  *     Ps = 6  -> Selective erase.
3850  *     Ps = 8  -> User-defined keys.
3851  *     Ps = 9  -> National replacement character sets.
3852  *     Ps = 1 5  -> Technical characters.
3853  *     Ps = 2 2  -> ANSI color, e.g., VT525.
3854  *     Ps = 2 9  -> ANSI text locator (i.e., DEC Locator mode).
3855  * CSI > Ps c
3856  *   Send Device Attributes (Secondary DA).
3857  *     Ps = 0  or omitted -> request the terminal's identification
3858  *     code.  The response depends on the decTerminalID resource set-
3859  *     ting.  It should apply only to VT220 and up, but xterm extends
3860  *     this to VT100.
3861  *     -> CSI  > Pp ; Pv ; Pc c
3862  *   where Pp denotes the terminal type
3863  *     Pp = 0  -> ``VT100''.
3864  *     Pp = 1  -> ``VT220''.
3865  *   and Pv is the firmware version (for xterm, this was originally
3866  *   the XFree86 patch number, starting with 95).  In a DEC termi-
3867  *   nal, Pc indicates the ROM cartridge registration number and is
3868  *   always zero.
3869  * More information:
3870  *   xterm/charproc.c - line 2012, for more information.
3871  *   vim responds with ^[[?0c or ^[[?1c after the terminal's response (?)
3872  */
3873 Terminal.prototype.sendDeviceAttributes = function(params) {
3874   if (params[0] > 0) return;
3875
3876   if (!this.prefix) {
3877     if (this.is('xterm')
3878         || this.is('rxvt-unicode')
3879         || this.is('screen')) {
3880       this.send('\x1b[?1;2c');
3881     } else if (this.is('linux')) {
3882       this.send('\x1b[?6c');
3883     }
3884   } else if (this.prefix === '>') {
3885     // xterm and urxvt
3886     // seem to spit this
3887     // out around ~370 times (?).
3888     if (this.is('xterm')) {
3889       this.send('\x1b[>0;276;0c');
3890     } else if (this.is('rxvt-unicode')) {
3891       this.send('\x1b[>85;95;0c');
3892     } else if (this.is('linux')) {
3893       // not supported by linux console.
3894       // linux console echoes parameters.
3895       this.send(params[0] + 'c');
3896     } else if (this.is('screen')) {
3897       this.send('\x1b[>83;40003;0c');
3898     }
3899   }
3900 };
3901
3902
3903 /**
3904  * CSI Pm d
3905  * Line Position Absolute  [row] (default = [1,column]) (VPA).
3906  */
3907 Terminal.prototype.linePosAbsolute = function(params) {
3908   var param = params[0];
3909   if (param < 1) param = 1;
3910   this.y = param - 1;
3911   if (this.y >= this.rows) {
3912     this.y = this.rows - 1;
3913   }
3914 };
3915
3916
3917 /**
3918  * 145 65 e * VPR - Vertical Position Relative
3919  * reuse CSI Ps B ?
3920  */
3921 Terminal.prototype.VPositionRelative = function(params) {
3922   var param = params[0];
3923   if (param < 1) param = 1;
3924   this.y += param;
3925   if (this.y >= this.rows) {
3926     this.y = this.rows - 1;
3927   }
3928 };
3929
3930
3931 /**
3932  * CSI Ps ; Ps f
3933  *   Horizontal and Vertical Position [row;column] (default =
3934  *   [1,1]) (HVP).
3935  */
3936 Terminal.prototype.HVPosition = function(params) {
3937   if (params[0] < 1) params[0] = 1;
3938   if (params[1] < 1) params[1] = 1;
3939
3940   this.y = params[0] - 1;
3941   if (this.y >= this.rows) {
3942     this.y = this.rows - 1;
3943   }
3944
3945   this.x = params[1] - 1;
3946   if (this.x >= this.cols) {
3947     this.x = this.cols - 1;
3948   }
3949 };
3950
3951
3952 /**
3953  * CSI Pm h  Set Mode (SM).
3954  *     Ps = 2  -> Keyboard Action Mode (AM).
3955  *     Ps = 4  -> Insert Mode (IRM).
3956  *     Ps = 1 2  -> Send/receive (SRM).
3957  *     Ps = 2 0  -> Automatic Newline (LNM).
3958  * CSI ? Pm h
3959  *   DEC Private Mode Set (DECSET).
3960  *     Ps = 1  -> Application Cursor Keys (DECCKM).
3961  *     Ps = 2  -> Designate USASCII for character sets G0-G3
3962  *     (DECANM), and set VT100 mode.
3963  *     Ps = 3  -> 132 Column Mode (DECCOLM).
3964  *     Ps = 4  -> Smooth (Slow) Scroll (DECSCLM).
3965  *     Ps = 5  -> Reverse Video (DECSCNM).
3966  *     Ps = 6  -> Origin Mode (DECOM).
3967  *     Ps = 7  -> Wraparound Mode (DECAWM).
3968  *     Ps = 8  -> Auto-repeat Keys (DECARM).
3969  *     Ps = 9  -> Send Mouse X & Y on button press.  See the sec-
3970  *     tion Mouse Tracking.
3971  *     Ps = 1 0  -> Show toolbar (rxvt).
3972  *     Ps = 1 2  -> Start Blinking Cursor (att610).
3973  *     Ps = 1 8  -> Print form feed (DECPFF).
3974  *     Ps = 1 9  -> Set print extent to full screen (DECPEX).
3975  *     Ps = 2 5  -> Show Cursor (DECTCEM).
3976  *     Ps = 3 0  -> Show scrollbar (rxvt).
3977  *     Ps = 3 5  -> Enable font-shifting functions (rxvt).
3978  *     Ps = 3 8  -> Enter Tektronix Mode (DECTEK).
3979  *     Ps = 4 0  -> Allow 80 -> 132 Mode.
3980  *     Ps = 4 1  -> more(1) fix (see curses resource).
3981  *     Ps = 4 2  -> Enable Nation Replacement Character sets (DECN-
3982  *     RCM).
3983  *     Ps = 4 4  -> Turn On Margin Bell.
3984  *     Ps = 4 5  -> Reverse-wraparound Mode.
3985  *     Ps = 4 6  -> Start Logging.  This is normally disabled by a
3986  *     compile-time option.
3987  *     Ps = 4 7  -> Use Alternate Screen Buffer.  (This may be dis-
3988  *     abled by the titeInhibit resource).
3989  *     Ps = 6 6  -> Application keypad (DECNKM).
3990  *     Ps = 6 7  -> Backarrow key sends backspace (DECBKM).
3991  *     Ps = 1 0 0 0  -> Send Mouse X & Y on button press and
3992  *     release.  See the section Mouse Tracking.
3993  *     Ps = 1 0 0 1  -> Use Hilite Mouse Tracking.
3994  *     Ps = 1 0 0 2  -> Use Cell Motion Mouse Tracking.
3995  *     Ps = 1 0 0 3  -> Use All Motion Mouse Tracking.
3996  *     Ps = 1 0 0 4  -> Send FocusIn/FocusOut events.
3997  *     Ps = 1 0 0 5  -> Enable Extended Mouse Mode.
3998  *     Ps = 1 0 1 0  -> Scroll to bottom on tty output (rxvt).
3999  *     Ps = 1 0 1 1  -> Scroll to bottom on key press (rxvt).
4000  *     Ps = 1 0 3 4  -> Interpret "meta" key, sets eighth bit.
4001  *     (enables the eightBitInput resource).
4002  *     Ps = 1 0 3 5  -> Enable special modifiers for Alt and Num-
4003  *     Lock keys.  (This enables the numLock resource).
4004  *     Ps = 1 0 3 6  -> Send ESC   when Meta modifies a key.  (This
4005  *     enables the metaSendsEscape resource).
4006  *     Ps = 1 0 3 7  -> Send DEL from the editing-keypad Delete
4007  *     key.
4008  *     Ps = 1 0 3 9  -> Send ESC  when Alt modifies a key.  (This
4009  *     enables the altSendsEscape resource).
4010  *     Ps = 1 0 4 0  -> Keep selection even if not highlighted.
4011  *     (This enables the keepSelection resource).
4012  *     Ps = 1 0 4 1  -> Use the CLIPBOARD selection.  (This enables
4013  *     the selectToClipboard resource).
4014  *     Ps = 1 0 4 2  -> Enable Urgency window manager hint when
4015  *     Control-G is received.  (This enables the bellIsUrgent
4016  *     resource).
4017  *     Ps = 1 0 4 3  -> Enable raising of the window when Control-G
4018  *     is received.  (enables the popOnBell resource).
4019  *     Ps = 1 0 4 7  -> Use Alternate Screen Buffer.  (This may be
4020  *     disabled by the titeInhibit resource).
4021  *     Ps = 1 0 4 8  -> Save cursor as in DECSC.  (This may be dis-
4022  *     abled by the titeInhibit resource).
4023  *     Ps = 1 0 4 9  -> Save cursor as in DECSC and use Alternate
4024  *     Screen Buffer, clearing it first.  (This may be disabled by
4025  *     the titeInhibit resource).  This combines the effects of the 1
4026  *     0 4 7  and 1 0 4 8  modes.  Use this with terminfo-based
4027  *     applications rather than the 4 7  mode.
4028  *     Ps = 1 0 5 0  -> Set terminfo/termcap function-key mode.
4029  *     Ps = 1 0 5 1  -> Set Sun function-key mode.
4030  *     Ps = 1 0 5 2  -> Set HP function-key mode.
4031  *     Ps = 1 0 5 3  -> Set SCO function-key mode.
4032  *     Ps = 1 0 6 0  -> Set legacy keyboard emulation (X11R6).
4033  *     Ps = 1 0 6 1  -> Set VT220 keyboard emulation.
4034  *     Ps = 2 0 0 4  -> Set bracketed paste mode.
4035  * Modes:
4036  *   http: *vt100.net/docs/vt220-rm/chapter4.html
4037  */
4038 Terminal.prototype.setMode = function(params) {
4039   if (typeof params === 'object') {
4040     var l = params.length
4041     , i = 0;
4042
4043     for (; i < l; i++) {
4044       this.setMode(params[i]);
4045     }
4046
4047     return;
4048   }
4049
4050   if (!this.prefix) {
4051     switch (params) {
4052       case 4:
4053         this.insertMode = true;
4054         break;
4055       case 20:
4056         //this.convertEol = true;
4057         break;
4058     }
4059   } else if (this.prefix === '?') {
4060     switch (params) {
4061       case 1:
4062         this.applicationCursor = true;
4063         break;
4064       case 2:
4065         this.setgCharset(0, Terminal.charsets.US);
4066         this.setgCharset(1, Terminal.charsets.US);
4067         this.setgCharset(2, Terminal.charsets.US);
4068         this.setgCharset(3, Terminal.charsets.US);
4069         // set VT100 mode here
4070         break;
4071       case 3: // 132 col mode
4072         this.savedCols = this.cols;
4073         this.resize(132, this.rows);
4074         break;
4075       case 6:
4076         this.originMode = true;
4077         break;
4078       case 7:
4079         this.wraparoundMode = true;
4080         break;
4081       case 12:
4082         // this.cursorBlink = true;
4083         break;
4084       case 66:
4085         this.log('Serial port requested application keypad.');
4086         this.applicationKeypad = true;
4087         this.viewport.syncScrollArea();
4088         break;
4089       case 9: // X10 Mouse
4090         // no release, no motion, no wheel, no modifiers.
4091       case 1000: // vt200 mouse
4092         // no motion.
4093         // no modifiers, except control on the wheel.
4094       case 1002: // button event mouse
4095       case 1003: // any event mouse
4096         // any event - sends motion events,
4097         // even if there is no button held down.
4098         this.x10Mouse = params === 9;
4099         this.vt200Mouse = params === 1000;
4100         this.normalMouse = params > 1000;
4101         this.mouseEvents = true;
4102         this.element.style.cursor = 'default';
4103         this.log('Binding to mouse events.');
4104         break;
4105       case 1004: // send focusin/focusout events
4106         // focusin: ^[[I
4107         // focusout: ^[[O
4108         this.sendFocus = true;
4109         break;
4110       case 1005: // utf8 ext mode mouse
4111         this.utfMouse = true;
4112         // for wide terminals
4113         // simply encodes large values as utf8 characters
4114         break;
4115       case 1006: // sgr ext mode mouse
4116         this.sgrMouse = true;
4117         // for wide terminals
4118         // does not add 32 to fields
4119         // press: ^[[<b;x;yM
4120         // release: ^[[<b;x;ym
4121         break;
4122       case 1015: // urxvt ext mode mouse
4123         this.urxvtMouse = true;
4124         // for wide terminals
4125         // numbers for fields
4126         // press: ^[[b;x;yM
4127         // motion: ^[[b;x;yT
4128         break;
4129       case 25: // show cursor
4130         this.cursorHidden = false;
4131         break;
4132       case 1049: // alt screen buffer cursor
4133         //this.saveCursor();
4134         ; // FALL-THROUGH
4135       case 47: // alt screen buffer
4136       case 1047: // alt screen buffer
4137         if (!this.normal) {
4138           var normal = {
4139             lines: this.lines,
4140             ybase: this.ybase,
4141             ydisp: this.ydisp,
4142             x: this.x,
4143             y: this.y,
4144             scrollTop: this.scrollTop,
4145             scrollBottom: this.scrollBottom,
4146             tabs: this.tabs
4147             // XXX save charset(s) here?
4148             // charset: this.charset,
4149             // glevel: this.glevel,
4150             // charsets: this.charsets
4151           };
4152           this.reset();
4153           this.viewport.syncScrollArea();
4154           this.normal = normal;
4155           this.showCursor();
4156         }
4157         break;
4158     }
4159   }
4160 };
4161
4162 /**
4163  * CSI Pm l  Reset Mode (RM).
4164  *     Ps = 2  -> Keyboard Action Mode (AM).
4165  *     Ps = 4  -> Replace Mode (IRM).
4166  *     Ps = 1 2  -> Send/receive (SRM).
4167  *     Ps = 2 0  -> Normal Linefeed (LNM).
4168  * CSI ? Pm l
4169  *   DEC Private Mode Reset (DECRST).
4170  *     Ps = 1  -> Normal Cursor Keys (DECCKM).
4171  *     Ps = 2  -> Designate VT52 mode (DECANM).
4172  *     Ps = 3  -> 80 Column Mode (DECCOLM).
4173  *     Ps = 4  -> Jump (Fast) Scroll (DECSCLM).
4174  *     Ps = 5  -> Normal Video (DECSCNM).
4175  *     Ps = 6  -> Normal Cursor Mode (DECOM).
4176  *     Ps = 7  -> No Wraparound Mode (DECAWM).
4177  *     Ps = 8  -> No Auto-repeat Keys (DECARM).
4178  *     Ps = 9  -> Don't send Mouse X & Y on button press.
4179  *     Ps = 1 0  -> Hide toolbar (rxvt).
4180  *     Ps = 1 2  -> Stop Blinking Cursor (att610).
4181  *     Ps = 1 8  -> Don't print form feed (DECPFF).
4182  *     Ps = 1 9  -> Limit print to scrolling region (DECPEX).
4183  *     Ps = 2 5  -> Hide Cursor (DECTCEM).
4184  *     Ps = 3 0  -> Don't show scrollbar (rxvt).
4185  *     Ps = 3 5  -> Disable font-shifting functions (rxvt).
4186  *     Ps = 4 0  -> Disallow 80 -> 132 Mode.
4187  *     Ps = 4 1  -> No more(1) fix (see curses resource).
4188  *     Ps = 4 2  -> Disable Nation Replacement Character sets (DEC-
4189  *     NRCM).
4190  *     Ps = 4 4  -> Turn Off Margin Bell.
4191  *     Ps = 4 5  -> No Reverse-wraparound Mode.
4192  *     Ps = 4 6  -> Stop Logging.  (This is normally disabled by a
4193  *     compile-time option).
4194  *     Ps = 4 7  -> Use Normal Screen Buffer.
4195  *     Ps = 6 6  -> Numeric keypad (DECNKM).
4196  *     Ps = 6 7  -> Backarrow key sends delete (DECBKM).
4197  *     Ps = 1 0 0 0  -> Don't send Mouse X & Y on button press and
4198  *     release.  See the section Mouse Tracking.
4199  *     Ps = 1 0 0 1  -> Don't use Hilite Mouse Tracking.
4200  *     Ps = 1 0 0 2  -> Don't use Cell Motion Mouse Tracking.
4201  *     Ps = 1 0 0 3  -> Don't use All Motion Mouse Tracking.
4202  *     Ps = 1 0 0 4  -> Don't send FocusIn/FocusOut events.
4203  *     Ps = 1 0 0 5  -> Disable Extended Mouse Mode.
4204  *     Ps = 1 0 1 0  -> Don't scroll to bottom on tty output
4205  *     (rxvt).
4206  *     Ps = 1 0 1 1  -> Don't scroll to bottom on key press (rxvt).
4207  *     Ps = 1 0 3 4  -> Don't interpret "meta" key.  (This disables
4208  *     the eightBitInput resource).
4209  *     Ps = 1 0 3 5  -> Disable special modifiers for Alt and Num-
4210  *     Lock keys.  (This disables the numLock resource).
4211  *     Ps = 1 0 3 6  -> Don't send ESC  when Meta modifies a key.
4212  *     (This disables the metaSendsEscape resource).
4213  *     Ps = 1 0 3 7  -> Send VT220 Remove from the editing-keypad
4214  *     Delete key.
4215  *     Ps = 1 0 3 9  -> Don't send ESC  when Alt modifies a key.
4216  *     (This disables the altSendsEscape resource).
4217  *     Ps = 1 0 4 0  -> Do not keep selection when not highlighted.
4218  *     (This disables the keepSelection resource).
4219  *     Ps = 1 0 4 1  -> Use the PRIMARY selection.  (This disables
4220  *     the selectToClipboard resource).
4221  *     Ps = 1 0 4 2  -> Disable Urgency window manager hint when
4222  *     Control-G is received.  (This disables the bellIsUrgent
4223  *     resource).
4224  *     Ps = 1 0 4 3  -> Disable raising of the window when Control-
4225  *     G is received.  (This disables the popOnBell resource).
4226  *     Ps = 1 0 4 7  -> Use Normal Screen Buffer, clearing screen
4227  *     first if in the Alternate Screen.  (This may be disabled by
4228  *     the titeInhibit resource).
4229  *     Ps = 1 0 4 8  -> Restore cursor as in DECRC.  (This may be
4230  *     disabled by the titeInhibit resource).
4231  *     Ps = 1 0 4 9  -> Use Normal Screen Buffer and restore cursor
4232  *     as in DECRC.  (This may be disabled by the titeInhibit
4233  *     resource).  This combines the effects of the 1 0 4 7  and 1 0
4234  *     4 8  modes.  Use this with terminfo-based applications rather
4235  *     than the 4 7  mode.
4236  *     Ps = 1 0 5 0  -> Reset terminfo/termcap function-key mode.
4237  *     Ps = 1 0 5 1  -> Reset Sun function-key mode.
4238  *     Ps = 1 0 5 2  -> Reset HP function-key mode.
4239  *     Ps = 1 0 5 3  -> Reset SCO function-key mode.
4240  *     Ps = 1 0 6 0  -> Reset legacy keyboard emulation (X11R6).
4241  *     Ps = 1 0 6 1  -> Reset keyboard emulation to Sun/PC style.
4242  *     Ps = 2 0 0 4  -> Reset bracketed paste mode.
4243  */
4244 Terminal.prototype.resetMode = function(params) {
4245   if (typeof params === 'object') {
4246     var l = params.length
4247     , i = 0;
4248
4249     for (; i < l; i++) {
4250       this.resetMode(params[i]);
4251     }
4252
4253     return;
4254   }
4255
4256   if (!this.prefix) {
4257     switch (params) {
4258       case 4:
4259         this.insertMode = false;
4260         break;
4261       case 20:
4262         //this.convertEol = false;
4263         break;
4264     }
4265   } else if (this.prefix === '?') {
4266     switch (params) {
4267       case 1:
4268         this.applicationCursor = false;
4269         break;
4270       case 3:
4271         if (this.cols === 132 && this.savedCols) {
4272           this.resize(this.savedCols, this.rows);
4273         }
4274         delete this.savedCols;
4275         break;
4276       case 6:
4277         this.originMode = false;
4278         break;
4279       case 7:
4280         this.wraparoundMode = false;
4281         break;
4282       case 12:
4283         // this.cursorBlink = false;
4284         break;
4285       case 66:
4286         this.log('Switching back to normal keypad.');
4287         this.applicationKeypad = false;
4288         this.viewport.syncScrollArea();
4289         break;
4290       case 9: // X10 Mouse
4291       case 1000: // vt200 mouse
4292       case 1002: // button event mouse
4293       case 1003: // any event mouse
4294         this.x10Mouse = false;
4295         this.vt200Mouse = false;
4296         this.normalMouse = false;
4297         this.mouseEvents = false;
4298         this.element.style.cursor = '';
4299         break;
4300       case 1004: // send focusin/focusout events
4301         this.sendFocus = false;
4302         break;
4303       case 1005: // utf8 ext mode mouse
4304         this.utfMouse = false;
4305         break;
4306       case 1006: // sgr ext mode mouse
4307         this.sgrMouse = false;
4308         break;
4309       case 1015: // urxvt ext mode mouse
4310         this.urxvtMouse = false;
4311         break;
4312       case 25: // hide cursor
4313         this.cursorHidden = true;
4314         break;
4315       case 1049: // alt screen buffer cursor
4316         ; // FALL-THROUGH
4317       case 47: // normal screen buffer
4318       case 1047: // normal screen buffer - clearing it first
4319         if (this.normal) {
4320           this.lines = this.normal.lines;
4321           this.ybase = this.normal.ybase;
4322           this.ydisp = this.normal.ydisp;
4323           this.x = this.normal.x;
4324           this.y = this.normal.y;
4325           this.scrollTop = this.normal.scrollTop;
4326           this.scrollBottom = this.normal.scrollBottom;
4327           this.tabs = this.normal.tabs;
4328           this.normal = null;
4329           // if (params === 1049) {
4330           //   this.x = this.savedX;
4331           //   this.y = this.savedY;
4332           // }
4333           this.refresh(0, this.rows - 1);
4334           this.viewport.syncScrollArea();
4335           this.showCursor();
4336         }
4337         break;
4338     }
4339   }
4340 };
4341
4342
4343 /**
4344  * CSI Ps ; Ps r
4345  *   Set Scrolling Region [top;bottom] (default = full size of win-
4346  *   dow) (DECSTBM).
4347  * CSI ? Pm r
4348  */
4349 Terminal.prototype.setScrollRegion = function(params) {
4350   if (this.prefix) return;
4351   this.scrollTop = (params[0] || 1) - 1;
4352   this.scrollBottom = (params[1] || this.rows) - 1;
4353   this.x = 0;
4354   this.y = 0;
4355 };
4356
4357
4358 /**
4359  * CSI s
4360  *   Save cursor (ANSI.SYS).
4361  */
4362 Terminal.prototype.saveCursor = function(params) {
4363   this.savedX = this.x;
4364   this.savedY = this.y;
4365 };
4366
4367
4368 /**
4369  * CSI u
4370  *   Restore cursor (ANSI.SYS).
4371  */
4372 Terminal.prototype.restoreCursor = function(params) {
4373   this.x = this.savedX || 0;
4374   this.y = this.savedY || 0;
4375 };
4376
4377
4378 /**
4379  * Lesser Used
4380  */
4381
4382 /**
4383  * CSI Ps I
4384  *   Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
4385  */
4386 Terminal.prototype.cursorForwardTab = function(params) {
4387   var param = params[0] || 1;
4388   while (param--) {
4389     this.x = this.nextStop();
4390   }
4391 };
4392
4393
4394 /**
4395  * CSI Ps S  Scroll up Ps lines (default = 1) (SU).
4396  */
4397 Terminal.prototype.scrollUp = function(params) {
4398   var param = params[0] || 1;
4399   while (param--) {
4400     this.lines.splice(this.ybase + this.scrollTop, 1);
4401     this.lines.splice(this.ybase + this.scrollBottom, 0, this.blankLine());
4402   }
4403   // this.maxRange();
4404   this.updateRange(this.scrollTop);
4405   this.updateRange(this.scrollBottom);
4406 };
4407
4408
4409 /**
4410  * CSI Ps T  Scroll down Ps lines (default = 1) (SD).
4411  */
4412 Terminal.prototype.scrollDown = function(params) {
4413   var param = params[0] || 1;
4414   while (param--) {
4415     this.lines.splice(this.ybase + this.scrollBottom, 1);
4416     this.lines.splice(this.ybase + this.scrollTop, 0, this.blankLine());
4417   }
4418   // this.maxRange();
4419   this.updateRange(this.scrollTop);
4420   this.updateRange(this.scrollBottom);
4421 };
4422
4423
4424 /**
4425  * CSI Ps ; Ps ; Ps ; Ps ; Ps T
4426  *   Initiate highlight mouse tracking.  Parameters are
4427  *   [func;startx;starty;firstrow;lastrow].  See the section Mouse
4428  *   Tracking.
4429  */
4430 Terminal.prototype.initMouseTracking = function(params) {
4431   // Relevant: DECSET 1001
4432 };
4433
4434
4435 /**
4436  * CSI > Ps; Ps T
4437  *   Reset one or more features of the title modes to the default
4438  *   value.  Normally, "reset" disables the feature.  It is possi-
4439  *   ble to disable the ability to reset features by compiling a
4440  *   different default for the title modes into xterm.
4441  *     Ps = 0  -> Do not set window/icon labels using hexadecimal.
4442  *     Ps = 1  -> Do not query window/icon labels using hexadeci-
4443  *     mal.
4444  *     Ps = 2  -> Do not set window/icon labels using UTF-8.
4445  *     Ps = 3  -> Do not query window/icon labels using UTF-8.
4446  *   (See discussion of "Title Modes").
4447  */
4448 Terminal.prototype.resetTitleModes = function(params) {
4449   ;
4450 };
4451
4452
4453 /**
4454  * CSI Ps Z  Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
4455  */
4456 Terminal.prototype.cursorBackwardTab = function(params) {
4457   var param = params[0] || 1;
4458   while (param--) {
4459     this.x = this.prevStop();
4460   }
4461 };
4462
4463
4464 /**
4465  * CSI Ps b  Repeat the preceding graphic character Ps times (REP).
4466  */
4467 Terminal.prototype.repeatPrecedingCharacter = function(params) {
4468   var param = params[0] || 1
4469   , line = this.lines.get(this.ybase + this.y)
4470   , ch = line[this.x - 1] || [this.defAttr, ' ', 1];
4471
4472   while (param--) line[this.x++] = ch;
4473 };
4474
4475
4476 /**
4477  * CSI Ps g  Tab Clear (TBC).
4478  *     Ps = 0  -> Clear Current Column (default).
4479  *     Ps = 3  -> Clear All.
4480  * Potentially:
4481  *   Ps = 2  -> Clear Stops on Line.
4482  *   http://vt100.net/annarbor/aaa-ug/section6.html
4483  */
4484 Terminal.prototype.tabClear = function(params) {
4485   var param = params[0];
4486   if (param <= 0) {
4487     delete this.tabs[this.x];
4488   } else if (param === 3) {
4489     this.tabs = {};
4490   }
4491 };
4492
4493
4494 /**
4495  * CSI Pm i  Media Copy (MC).
4496  *     Ps = 0  -> Print screen (default).
4497  *     Ps = 4  -> Turn off printer controller mode.
4498  *     Ps = 5  -> Turn on printer controller mode.
4499  * CSI ? Pm i
4500  *   Media Copy (MC, DEC-specific).
4501  *     Ps = 1  -> Print line containing cursor.
4502  *     Ps = 4  -> Turn off autoprint mode.
4503  *     Ps = 5  -> Turn on autoprint mode.
4504  *     Ps = 1  0  -> Print composed display, ignores DECPEX.
4505  *     Ps = 1  1  -> Print all pages.
4506  */
4507 Terminal.prototype.mediaCopy = function(params) {
4508   ;
4509 };
4510
4511
4512 /**
4513  * CSI > Ps; Ps m
4514  *   Set or reset resource-values used by xterm to decide whether
4515  *   to construct escape sequences holding information about the
4516  *   modifiers pressed with a given key.  The first parameter iden-
4517  *   tifies the resource to set/reset.  The second parameter is the
4518  *   value to assign to the resource.  If the second parameter is
4519  *   omitted, the resource is reset to its initial value.
4520  *     Ps = 1  -> modifyCursorKeys.
4521  *     Ps = 2  -> modifyFunctionKeys.
4522  *     Ps = 4  -> modifyOtherKeys.
4523  *   If no parameters are given, all resources are reset to their
4524  *   initial values.
4525  */
4526 Terminal.prototype.setResources = function(params) {
4527   ;
4528 };
4529
4530
4531 /**
4532  * CSI > Ps n
4533  *   Disable modifiers which may be enabled via the CSI > Ps; Ps m
4534  *   sequence.  This corresponds to a resource value of "-1", which
4535  *   cannot be set with the other sequence.  The parameter identi-
4536  *   fies the resource to be disabled:
4537  *     Ps = 1  -> modifyCursorKeys.
4538  *     Ps = 2  -> modifyFunctionKeys.
4539  *     Ps = 4  -> modifyOtherKeys.
4540  *   If the parameter is omitted, modifyFunctionKeys is disabled.
4541  *   When modifyFunctionKeys is disabled, xterm uses the modifier
4542  *   keys to make an extended sequence of functions rather than
4543  *   adding a parameter to each function key to denote the modi-
4544  *   fiers.
4545  */
4546 Terminal.prototype.disableModifiers = function(params) {
4547   ;
4548 };
4549
4550
4551 /**
4552  * CSI > Ps p
4553  *   Set resource value pointerMode.  This is used by xterm to
4554  *   decide whether to hide the pointer cursor as the user types.
4555  *   Valid values for the parameter:
4556  *     Ps = 0  -> never hide the pointer.
4557  *     Ps = 1  -> hide if the mouse tracking mode is not enabled.
4558  *     Ps = 2  -> always hide the pointer.  If no parameter is
4559  *     given, xterm uses the default, which is 1 .
4560  */
4561 Terminal.prototype.setPointerMode = function(params) {
4562   ;
4563 };
4564
4565
4566 /**
4567  * CSI ! p   Soft terminal reset (DECSTR).
4568  * http://vt100.net/docs/vt220-rm/table4-10.html
4569  */
4570 Terminal.prototype.softReset = function(params) {
4571   this.cursorHidden = false;
4572   this.insertMode = false;
4573   this.originMode = false;
4574   this.wraparoundMode = false; // autowrap
4575   this.applicationKeypad = false; // ?
4576   this.viewport.syncScrollArea();
4577   this.applicationCursor = false;
4578   this.scrollTop = 0;
4579   this.scrollBottom = this.rows - 1;
4580   this.curAttr = this.defAttr;
4581   this.x = this.y = 0; // ?
4582   this.charset = null;
4583   this.glevel = 0; // ??
4584   this.charsets = [null]; // ??
4585 };
4586
4587
4588 /**
4589  * CSI Ps$ p
4590  *   Request ANSI mode (DECRQM).  For VT300 and up, reply is
4591  *     CSI Ps; Pm$ y
4592  *   where Ps is the mode number as in RM, and Pm is the mode
4593  *   value:
4594  *     0 - not recognized
4595  *     1 - set
4596  *     2 - reset
4597  *     3 - permanently set
4598  *     4 - permanently reset
4599  */
4600 Terminal.prototype.requestAnsiMode = function(params) {
4601   ;
4602 };
4603
4604
4605 /**
4606  * CSI ? Ps$ p
4607  *   Request DEC private mode (DECRQM).  For VT300 and up, reply is
4608  *     CSI ? Ps; Pm$ p
4609  *   where Ps is the mode number as in DECSET, Pm is the mode value
4610  *   as in the ANSI DECRQM.
4611  */
4612 Terminal.prototype.requestPrivateMode = function(params) {
4613   ;
4614 };
4615
4616
4617 /**
4618  * CSI Ps ; Ps " p
4619  *   Set conformance level (DECSCL).  Valid values for the first
4620  *   parameter:
4621  *     Ps = 6 1  -> VT100.
4622  *     Ps = 6 2  -> VT200.
4623  *     Ps = 6 3  -> VT300.
4624  *   Valid values for the second parameter:
4625  *     Ps = 0  -> 8-bit controls.
4626  *     Ps = 1  -> 7-bit controls (always set for VT100).
4627  *     Ps = 2  -> 8-bit controls.
4628  */
4629 Terminal.prototype.setConformanceLevel = function(params) {
4630   ;
4631 };
4632
4633
4634 /**
4635  * CSI Ps q  Load LEDs (DECLL).
4636  *     Ps = 0  -> Clear all LEDS (default).
4637  *     Ps = 1  -> Light Num Lock.
4638  *     Ps = 2  -> Light Caps Lock.
4639  *     Ps = 3  -> Light Scroll Lock.
4640  *     Ps = 2  1  -> Extinguish Num Lock.
4641  *     Ps = 2  2  -> Extinguish Caps Lock.
4642  *     Ps = 2  3  -> Extinguish Scroll Lock.
4643  */
4644 Terminal.prototype.loadLEDs = function(params) {
4645   ;
4646 };
4647
4648
4649 /**
4650  * CSI Ps SP q
4651  *   Set cursor style (DECSCUSR, VT520).
4652  *     Ps = 0  -> blinking block.
4653  *     Ps = 1  -> blinking block (default).
4654  *     Ps = 2  -> steady block.
4655  *     Ps = 3  -> blinking underline.
4656  *     Ps = 4  -> steady underline.
4657  */
4658 Terminal.prototype.setCursorStyle = function(params) {
4659   ;
4660 };
4661
4662
4663 /**
4664  * CSI Ps " q
4665  *   Select character protection attribute (DECSCA).  Valid values
4666  *   for the parameter:
4667  *     Ps = 0  -> DECSED and DECSEL can erase (default).
4668  *     Ps = 1  -> DECSED and DECSEL cannot erase.
4669  *     Ps = 2  -> DECSED and DECSEL can erase.
4670  */
4671 Terminal.prototype.setCharProtectionAttr = function(params) {
4672   ;
4673 };
4674
4675
4676 /**
4677  * CSI ? Pm r
4678  *   Restore DEC Private Mode Values.  The value of Ps previously
4679  *   saved is restored.  Ps values are the same as for DECSET.
4680  */
4681 Terminal.prototype.restorePrivateValues = function(params) {
4682   ;
4683 };
4684
4685
4686 /**
4687  * CSI Pt; Pl; Pb; Pr; Ps$ r
4688  *   Change Attributes in Rectangular Area (DECCARA), VT400 and up.
4689  *     Pt; Pl; Pb; Pr denotes the rectangle.
4690  *     Ps denotes the SGR attributes to change: 0, 1, 4, 5, 7.
4691  * NOTE: xterm doesn't enable this code by default.
4692  */
4693 Terminal.prototype.setAttrInRectangle = function(params) {
4694   var t = params[0]
4695   , l = params[1]
4696   , b = params[2]
4697   , r = params[3]
4698   , attr = params[4];
4699
4700   var line
4701   , i;
4702
4703   for (; t < b + 1; t++) {
4704     line = this.lines.get(this.ybase + t);
4705     for (i = l; i < r; i++) {
4706       line[i] = [attr, line[i][1]];
4707     }
4708   }
4709
4710   // this.maxRange();
4711   this.updateRange(params[0]);
4712   this.updateRange(params[2]);
4713 };
4714
4715
4716 /**
4717  * CSI Pc; Pt; Pl; Pb; Pr$ x
4718  *   Fill Rectangular Area (DECFRA), VT420 and up.
4719  *     Pc is the character to use.
4720  *     Pt; Pl; Pb; Pr denotes the rectangle.
4721  * NOTE: xterm doesn't enable this code by default.
4722  */
4723 Terminal.prototype.fillRectangle = function(params) {
4724   var ch = params[0]
4725   , t = params[1]
4726   , l = params[2]
4727   , b = params[3]
4728   , r = params[4];
4729
4730   var line
4731   , i;
4732
4733   for (; t < b + 1; t++) {
4734     line = this.lines.get(this.ybase + t);
4735     for (i = l; i < r; i++) {
4736       line[i] = [line[i][0], String.fromCharCode(ch)];
4737     }
4738   }
4739
4740   // this.maxRange();
4741   this.updateRange(params[1]);
4742   this.updateRange(params[3]);
4743 };
4744
4745
4746 /**
4747  * CSI Ps ; Pu ' z
4748  *   Enable Locator Reporting (DECELR).
4749  *   Valid values for the first parameter:
4750  *     Ps = 0  -> Locator disabled (default).
4751  *     Ps = 1  -> Locator enabled.
4752  *     Ps = 2  -> Locator enabled for one report, then disabled.
4753  *   The second parameter specifies the coordinate unit for locator
4754  *   reports.
4755  *   Valid values for the second parameter:
4756  *     Pu = 0  <- or omitted -> default to character cells.
4757  *     Pu = 1  <- device physical pixels.
4758  *     Pu = 2  <- character cells.
4759  */
4760 Terminal.prototype.enableLocatorReporting = function(params) {
4761   var val = params[0] > 0;
4762   //this.mouseEvents = val;
4763   //this.decLocator = val;
4764 };
4765
4766
4767 /**
4768  * CSI Pt; Pl; Pb; Pr$ z
4769  *   Erase Rectangular Area (DECERA), VT400 and up.
4770  *     Pt; Pl; Pb; Pr denotes the rectangle.
4771  * NOTE: xterm doesn't enable this code by default.
4772  */
4773 Terminal.prototype.eraseRectangle = function(params) {
4774   var t = params[0]
4775   , l = params[1]
4776   , b = params[2]
4777   , r = params[3];
4778
4779   var line
4780   , i
4781   , ch;
4782
4783   ch = [this.eraseAttr(), ' ', 1]; // xterm?
4784
4785   for (; t < b + 1; t++) {
4786     line = this.lines.get(this.ybase + t);
4787     for (i = l; i < r; i++) {
4788       line[i] = ch;
4789     }
4790   }
4791
4792   // this.maxRange();
4793   this.updateRange(params[0]);
4794   this.updateRange(params[2]);
4795 };
4796
4797
4798 /**
4799  * CSI P m SP }
4800  * Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
4801  * NOTE: xterm doesn't enable this code by default.
4802  */
4803 Terminal.prototype.insertColumns = function() {
4804   var param = params[0]
4805   , l = this.ybase + this.rows
4806   , ch = [this.eraseAttr(), ' ', 1] // xterm?
4807   , i;
4808
4809   while (param--) {
4810     for (i = this.ybase; i < l; i++) {
4811       this.lines.get(i).splice(this.x + 1, 0, ch);
4812       this.lines.get(i).pop();
4813     }
4814   }
4815
4816   this.maxRange();
4817 };
4818
4819
4820 /**
4821  * CSI P m SP ~
4822  * Delete P s Column(s) (default = 1) (DECDC), VT420 and up
4823  * NOTE: xterm doesn't enable this code by default.
4824  */
4825 Terminal.prototype.deleteColumns = function() {
4826   var param = params[0]
4827   , l = this.ybase + this.rows
4828   , ch = [this.eraseAttr(), ' ', 1] // xterm?
4829   , i;
4830
4831   while (param--) {
4832     for (i = this.ybase; i < l; i++) {
4833       this.lines.get(i).splice(this.x, 1);
4834       this.lines.get(i).push(ch);
4835     }
4836   }
4837
4838   this.maxRange();
4839 };
4840
4841 /**
4842  * Character Sets
4843  */
4844
4845 Terminal.charsets = {};
4846
4847 // DEC Special Character and Line Drawing Set.
4848 // http://vt100.net/docs/vt102-ug/table5-13.html
4849 // A lot of curses apps use this if they see TERM=xterm.
4850 // testing: echo -e '\e(0a\e(B'
4851 // The xterm output sometimes seems to conflict with the
4852 // reference above. xterm seems in line with the reference
4853 // when running vttest however.
4854 // The table below now uses xterm's output from vttest.
4855 Terminal.charsets.SCLD = { // (0
4856   '`': '\u25c6', // '◆'
4857   'a': '\u2592', // '▒'
4858   'b': '\u0009', // '\t'
4859   'c': '\u000c', // '\f'
4860   'd': '\u000d', // '\r'
4861   'e': '\u000a', // '\n'
4862   'f': '\u00b0', // '°'
4863   'g': '\u00b1', // '±'
4864   'h': '\u2424', // '\u2424' (NL)
4865   'i': '\u000b', // '\v'
4866   'j': '\u2518', // '┘'
4867   'k': '\u2510', // '┐'
4868   'l': '\u250c', // '┌'
4869   'm': '\u2514', // '└'
4870   'n': '\u253c', // '┼'
4871   'o': '\u23ba', // '⎺'
4872   'p': '\u23bb', // '⎻'
4873   'q': '\u2500', // '─'
4874   'r': '\u23bc', // '⎼'
4875   's': '\u23bd', // '⎽'
4876   't': '\u251c', // '├'
4877   'u': '\u2524', // '┤'
4878   'v': '\u2534', // '┴'
4879   'w': '\u252c', // '┬'
4880   'x': '\u2502', // '│'
4881   'y': '\u2264', // '≤'
4882   'z': '\u2265', // '≥'
4883   '{': '\u03c0', // 'π'
4884   '|': '\u2260', // '≠'
4885   '}': '\u00a3', // '£'
4886   '~': '\u00b7'  // '·'
4887 };
4888
4889 Terminal.charsets.UK = null; // (A
4890 Terminal.charsets.US = null; // (B (USASCII)
4891 Terminal.charsets.Dutch = null; // (4
4892 Terminal.charsets.Finnish = null; // (C or (5
4893 Terminal.charsets.French = null; // (R
4894 Terminal.charsets.FrenchCanadian = null; // (Q
4895 Terminal.charsets.German = null; // (K
4896 Terminal.charsets.Italian = null; // (Y
4897 Terminal.charsets.NorwegianDanish = null; // (E or (6
4898 Terminal.charsets.Spanish = null; // (Z
4899 Terminal.charsets.Swedish = null; // (H or (7
4900 Terminal.charsets.Swiss = null; // (=
4901 Terminal.charsets.ISOLatin = null; // /A
4902
4903 /**
4904  * Helpers
4905  */
4906
4907 function on(el, type, handler, capture) {
4908   if (!Array.isArray(el)) {
4909     el = [el];
4910   }
4911   el.forEach(function (element) {
4912     element.addEventListener(type, handler, capture || false);
4913   });
4914 }
4915
4916 function off(el, type, handler, capture) {
4917   el.removeEventListener(type, handler, capture || false);
4918 }
4919
4920 function cancel(ev, force) {
4921   if (!this.cancelEvents && !force) {
4922     return;
4923   }
4924   ev.preventDefault();
4925   ev.stopPropagation();
4926   return false;
4927 }
4928
4929 function inherits(child, parent) {
4930   function f() {
4931     this.constructor = child;
4932   }
4933   f.prototype = parent.prototype;
4934   child.prototype = new f;
4935 }
4936
4937 // if bold is broken, we can't
4938 // use it in the terminal.
4939 function isBoldBroken(document) {
4940   var body = document.getElementsByTagName('body')[0];
4941   var el = document.createElement('span');
4942   el.innerHTML = 'hello world';
4943   body.appendChild(el);
4944   var w1 = el.scrollWidth;
4945   el.style.fontWeight = 'bold';
4946   var w2 = el.scrollWidth;
4947   body.removeChild(el);
4948   return w1 !== w2;
4949 }
4950
4951 function indexOf(obj, el) {
4952   var i = obj.length;
4953   while (i--) {
4954     if (obj[i] === el) return i;
4955   }
4956   return -1;
4957 }
4958
4959 function isThirdLevelShift(term, ev) {
4960   var thirdLevelKey =
4961       (term.browser.isMac && ev.altKey && !ev.ctrlKey && !ev.metaKey) ||
4962       (term.browser.isMSWindows && ev.altKey && ev.ctrlKey && !ev.metaKey);
4963
4964   if (ev.type == 'keypress') {
4965     return thirdLevelKey;
4966   }
4967
4968   // Don't invoke for arrows, pageDown, home, backspace, etc. (on non-keypress events)
4969   return thirdLevelKey && (!ev.keyCode || ev.keyCode > 47);
4970 }
4971
4972 function matchColor(r1, g1, b1) {
4973   var hash = (r1 << 16) | (g1 << 8) | b1;
4974
4975   if (matchColor._cache[hash] != null) {
4976     return matchColor._cache[hash];
4977   }
4978
4979   var ldiff = Infinity
4980   , li = -1
4981   , i = 0
4982   , c
4983   , r2
4984   , g2
4985   , b2
4986   , diff;
4987
4988   for (; i < Terminal.vcolors.length; i++) {
4989     c = Terminal.vcolors[i];
4990     r2 = c[0];
4991     g2 = c[1];
4992     b2 = c[2];
4993
4994     diff = matchColor.distance(r1, g1, b1, r2, g2, b2);
4995
4996     if (diff === 0) {
4997       li = i;
4998       break;
4999     }
5000
5001     if (diff < ldiff) {
5002       ldiff = diff;
5003       li = i;
5004     }
5005   }
5006
5007   return matchColor._cache[hash] = li;
5008 }
5009
5010 matchColor._cache = {};
5011
5012 // http://stackoverflow.com/questions/1633828
5013 matchColor.distance = function(r1, g1, b1, r2, g2, b2) {
5014   return Math.pow(30 * (r1 - r2), 2)
5015     + Math.pow(59 * (g1 - g2), 2)
5016     + Math.pow(11 * (b1 - b2), 2);
5017 };
5018
5019 function each(obj, iter, con) {
5020   if (obj.forEach) return obj.forEach(iter, con);
5021   for (var i = 0; i < obj.length; i++) {
5022     iter.call(con, obj[i], i, obj);
5023   }
5024 }
5025
5026 function keys(obj) {
5027   if (Object.keys) return Object.keys(obj);
5028   var key, keys = [];
5029   for (key in obj) {
5030     if (Object.prototype.hasOwnProperty.call(obj, key)) {
5031       keys.push(key);
5032     }
5033   }
5034   return keys;
5035 }
5036
5037 var wcwidth = (function(opts) {
5038   // extracted from https://www.cl.cam.ac.uk/%7Emgk25/ucs/wcwidth.c
5039   // combining characters
5040   var COMBINING = [
5041     [0x0300, 0x036F], [0x0483, 0x0486], [0x0488, 0x0489],
5042     [0x0591, 0x05BD], [0x05BF, 0x05BF], [0x05C1, 0x05C2],
5043     [0x05C4, 0x05C5], [0x05C7, 0x05C7], [0x0600, 0x0603],
5044     [0x0610, 0x0615], [0x064B, 0x065E], [0x0670, 0x0670],
5045     [0x06D6, 0x06E4], [0x06E7, 0x06E8], [0x06EA, 0x06ED],
5046     [0x070F, 0x070F], [0x0711, 0x0711], [0x0730, 0x074A],
5047     [0x07A6, 0x07B0], [0x07EB, 0x07F3], [0x0901, 0x0902],
5048     [0x093C, 0x093C], [0x0941, 0x0948], [0x094D, 0x094D],
5049     [0x0951, 0x0954], [0x0962, 0x0963], [0x0981, 0x0981],
5050     [0x09BC, 0x09BC], [0x09C1, 0x09C4], [0x09CD, 0x09CD],
5051     [0x09E2, 0x09E3], [0x0A01, 0x0A02], [0x0A3C, 0x0A3C],
5052     [0x0A41, 0x0A42], [0x0A47, 0x0A48], [0x0A4B, 0x0A4D],
5053     [0x0A70, 0x0A71], [0x0A81, 0x0A82], [0x0ABC, 0x0ABC],
5054     [0x0AC1, 0x0AC5], [0x0AC7, 0x0AC8], [0x0ACD, 0x0ACD],
5055     [0x0AE2, 0x0AE3], [0x0B01, 0x0B01], [0x0B3C, 0x0B3C],
5056     [0x0B3F, 0x0B3F], [0x0B41, 0x0B43], [0x0B4D, 0x0B4D],
5057     [0x0B56, 0x0B56], [0x0B82, 0x0B82], [0x0BC0, 0x0BC0],
5058     [0x0BCD, 0x0BCD], [0x0C3E, 0x0C40], [0x0C46, 0x0C48],
5059     [0x0C4A, 0x0C4D], [0x0C55, 0x0C56], [0x0CBC, 0x0CBC],
5060     [0x0CBF, 0x0CBF], [0x0CC6, 0x0CC6], [0x0CCC, 0x0CCD],
5061     [0x0CE2, 0x0CE3], [0x0D41, 0x0D43], [0x0D4D, 0x0D4D],
5062     [0x0DCA, 0x0DCA], [0x0DD2, 0x0DD4], [0x0DD6, 0x0DD6],
5063     [0x0E31, 0x0E31], [0x0E34, 0x0E3A], [0x0E47, 0x0E4E],
5064     [0x0EB1, 0x0EB1], [0x0EB4, 0x0EB9], [0x0EBB, 0x0EBC],
5065     [0x0EC8, 0x0ECD], [0x0F18, 0x0F19], [0x0F35, 0x0F35],
5066     [0x0F37, 0x0F37], [0x0F39, 0x0F39], [0x0F71, 0x0F7E],
5067     [0x0F80, 0x0F84], [0x0F86, 0x0F87], [0x0F90, 0x0F97],
5068     [0x0F99, 0x0FBC], [0x0FC6, 0x0FC6], [0x102D, 0x1030],
5069     [0x1032, 0x1032], [0x1036, 0x1037], [0x1039, 0x1039],
5070     [0x1058, 0x1059], [0x1160, 0x11FF], [0x135F, 0x135F],
5071     [0x1712, 0x1714], [0x1732, 0x1734], [0x1752, 0x1753],
5072     [0x1772, 0x1773], [0x17B4, 0x17B5], [0x17B7, 0x17BD],
5073     [0x17C6, 0x17C6], [0x17C9, 0x17D3], [0x17DD, 0x17DD],
5074     [0x180B, 0x180D], [0x18A9, 0x18A9], [0x1920, 0x1922],
5075     [0x1927, 0x1928], [0x1932, 0x1932], [0x1939, 0x193B],
5076     [0x1A17, 0x1A18], [0x1B00, 0x1B03], [0x1B34, 0x1B34],
5077     [0x1B36, 0x1B3A], [0x1B3C, 0x1B3C], [0x1B42, 0x1B42],
5078     [0x1B6B, 0x1B73], [0x1DC0, 0x1DCA], [0x1DFE, 0x1DFF],
5079     [0x200B, 0x200F], [0x202A, 0x202E], [0x2060, 0x2063],
5080     [0x206A, 0x206F], [0x20D0, 0x20EF], [0x302A, 0x302F],
5081     [0x3099, 0x309A], [0xA806, 0xA806], [0xA80B, 0xA80B],
5082     [0xA825, 0xA826], [0xFB1E, 0xFB1E], [0xFE00, 0xFE0F],
5083     [0xFE20, 0xFE23], [0xFEFF, 0xFEFF], [0xFFF9, 0xFFFB],
5084     [0x10A01, 0x10A03], [0x10A05, 0x10A06], [0x10A0C, 0x10A0F],
5085     [0x10A38, 0x10A3A], [0x10A3F, 0x10A3F], [0x1D167, 0x1D169],
5086     [0x1D173, 0x1D182], [0x1D185, 0x1D18B], [0x1D1AA, 0x1D1AD],
5087     [0x1D242, 0x1D244], [0xE0001, 0xE0001], [0xE0020, 0xE007F],
5088     [0xE0100, 0xE01EF]
5089   ];
5090   // binary search
5091   function bisearch(ucs) {
5092     var min = 0;
5093     var max = COMBINING.length - 1;
5094     var mid;
5095     if (ucs < COMBINING[0][0] || ucs > COMBINING[max][1])
5096       return false;
5097     while (max >= min) {
5098       mid = Math.floor((min + max) / 2);
5099       if (ucs > COMBINING[mid][1])
5100         min = mid + 1;
5101       else if (ucs < COMBINING[mid][0])
5102         max = mid - 1;
5103       else
5104         return true;
5105     }
5106     return false;
5107   }
5108   function wcwidth(ucs) {
5109     // test for 8-bit control characters
5110     if (ucs === 0)
5111       return opts.nul;
5112     if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
5113       return opts.control;
5114     // binary search in table of non-spacing characters
5115     if (bisearch(ucs))
5116       return 0;
5117     // if we arrive here, ucs is not a combining or C0/C1 control character
5118     return 1 +
5119       (
5120       ucs >= 0x1100 &&
5121       (
5122         ucs <= 0x115f ||                // Hangul Jamo init. consonants
5123         ucs == 0x2329 ||
5124         ucs == 0x232a ||
5125         (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) ||  // CJK..Yi
5126         (ucs >= 0xac00 && ucs <= 0xd7a3) ||    // Hangul Syllables
5127         (ucs >= 0xf900 && ucs <= 0xfaff) ||    // CJK Compat Ideographs
5128         (ucs >= 0xfe10 && ucs <= 0xfe19) ||    // Vertical forms
5129         (ucs >= 0xfe30 && ucs <= 0xfe6f) ||    // CJK Compat Forms
5130         (ucs >= 0xff00 && ucs <= 0xff60) ||    // Fullwidth Forms
5131         (ucs >= 0xffe0 && ucs <= 0xffe6) ||
5132         (ucs >= 0x20000 && ucs <= 0x2fffd) ||
5133         (ucs >= 0x30000 && ucs <= 0x3fffd)
5134       )
5135     );
5136   }
5137   return wcwidth;
5138 })({nul: 0, control: 0});  // configurable options
5139
5140 /**
5141  * Expose
5142  */
5143
5144 Terminal.EventEmitter = EventEmitter;
5145 Terminal.inherits = inherits;
5146
5147 /**
5148  * Adds an event listener to the terminal.
5149  *
5150  * @param {string} event The name of the event. TODO: Document all event types
5151  * @param {function} callback The function to call when the event is triggered.
5152  */
5153 Terminal.on = on;
5154 Terminal.off = off;
5155 Terminal.cancel = cancel;
5156
5157 module.exports = Terminal;