lib/table.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "table.h"
  20
  21 #include "dynamic-string.h"
  22 #include "json.h"
  23 #include "ovsdb-data.h"
  24 #include "ovsdb-error.h"
  25 #include "timeval.h"
  26 #include "util.h"
  27
  28 struct column {
  29     char *heading;
  30 };
  31
  32 static char *
  33 cell_to_text(struct cell *cell, const struct table_style *style)
  34 {
  35     if (!cell->text) {
  36         if (cell->json) {
  37             if (style->cell_format == CF_JSON || !cell->type) {
  38                 cell->text = json_to_string(cell->json, JSSF_SORT);
  39             } else {
  40                 struct ovsdb_datum datum;
  41                 struct ovsdb_error *error;
  42                 struct ds s;
  43
  44                 error = ovsdb_datum_from_json(&datum, cell->type, cell->json,
  45                                               NULL);
  46                 if (!error) {
  47                     ds_init(&s);
  48                     if (style->cell_format == CF_STRING) {
  49                         ovsdb_datum_to_string(&datum, cell->type, &s);
  50                     } else {
  51                         ovsdb_datum_to_bare(&datum, cell->type, &s);
  52                     }
  53                     ovsdb_datum_destroy(&datum, cell->type);
  54                     cell->text = ds_steal_cstr(&s);
  55                 } else {
  56                     cell->text = json_to_string(cell->json, JSSF_SORT);
  57                     ovsdb_error_destroy(error);
  58                 }
  59             }
  60         } else {
  61             cell->text = xstrdup("");
  62         }
  63     }
  64
  65     return cell->text;
  66 }
  67
  68 static void
  69 cell_destroy(struct cell *cell)
  70 {
  71     free(cell->text);
  72     json_destroy(cell->json);
  73 }
  74
  75 /* Initializes 'table' as an empty table.
  76  *
  77  * The caller should then:
  78  *
  79  * 1. Call table_add_column() once for each column.
  80  * 2. For each row:
  81  *    2a. Call table_add_row().
  82  *    2b. For each column in the cell, call table_add_cell() and fill in
  83  *        the returned cell.
  84  * 3. Call table_print() to print the final table.
  85  * 4. Free the table with table_destroy().
  86  */
  87 void
  88 table_init(struct table *table)
  89 {
  90     memset(table, 0, sizeof *table);
  91 }
  92
  93 /* Destroys 'table' and frees all associated storage.  (However, the client
  94  * owns the 'type' members pointed to by cells, so these are not destroyed.) */
  95 void
  96 table_destroy(struct table *table)
  97 {
  98     if (table) {
  99         size_t i;
 100
 101         for (i = 0; i < table->n_columns; i++) {
 102             free(table->columns[i].heading);
 103         }
 104         free(table->columns);
 105
 106         for (i = 0; i < table->n_columns * table->n_rows; i++) {
 107             cell_destroy(&table->cells[i]);
 108         }
 109         free(table->cells);
 110
 111         free(table->caption);
 112     }
 113 }
 114
 115 /* Sets 'caption' as the caption for 'table'.
 116  *
 117  * 'table' takes ownership of 'caption'. */
 118 void
 119 table_set_caption(struct table *table, char *caption)
 120 {
 121     free(table->caption);
 122     table->caption = caption;
 123 }
 124
 125 /* Turns printing a timestamp along with 'table' on or off, according to
 126  * 'timestamp'.  */
 127 void
 128 table_set_timestamp(struct table *table, bool timestamp)
 129 {
 130     table->timestamp = timestamp;
 131 }
 132
 133 /* Adds a new column to 'table' just to the right of any existing column, with
 134  * 'heading' as a title for the column.  'heading' must be a valid printf()
 135  * format specifier.
 136  *
 137  * Columns must be added before any data is put into 'table'. */
 138 void
 139 table_add_column(struct table *table, const char *heading, ...)
 140 {
 141     struct column *column;
 142     va_list args;
 143
 144     ovs_assert(!table->n_rows);
 145     if (table->n_columns >= table->allocated_columns) {
 146         table->columns = x2nrealloc(table->columns, &table->allocated_columns,
 147                                     sizeof *table->columns);
 148     }
 149     column = &table->columns[table->n_columns++];
 150
 151     va_start(args, heading);
 152     column->heading = xvasprintf(heading, args);
 153     va_end(args);
 154 }
 155
 156 static struct cell *
 157 table_cell__(const struct table *table, size_t row, size_t column)
 158 {
 159     return &table->cells[column + row * table->n_columns];
 160 }
 161
 162 /* Adds a new row to 'table'.  The table's columns must already have been added
 163  * with table_add_column().
 164  *
 165  * The row is initially empty; use table_add_cell() to start filling it in. */
 166 void
 167 table_add_row(struct table *table)
 168 {
 169     size_t x, y;
 170
 171     if (table->n_rows >= table->allocated_rows) {
 172         table->cells = x2nrealloc(table->cells, &table->allocated_rows,
 173                                   table->n_columns * sizeof *table->cells);
 174     }
 175
 176     y = table->n_rows++;
 177     table->current_column = 0;
 178     for (x = 0; x < table->n_columns; x++) {
 179         struct cell *cell = table_cell__(table, y, x);
 180         memset(cell, 0, sizeof *cell);
 181     }
 182 }
 183
 184 /* Adds a new cell in the current row of 'table', which must have been added
 185  * with table_add_row().  Cells are filled in the same order that the columns
 186  * were added with table_add_column().
 187  *
 188  * The caller is responsible for filling in the returned cell, in one of two
 189  * fashions:
 190  *
 191  *   - If the cell should contain an ovsdb_datum, formatted according to the
 192  *     table style, then fill in the 'json' member with the JSON representation
 193  *     of the datum and 'type' with its type.
 194  *
 195  *   - If the cell should contain a fixed text string, then the caller should
 196  *     assign that string to the 'text' member.  This is undesirable if the
 197  *     cell actually contains OVSDB data because 'text' cannot be formatted
 198  *     according to the table style; it is always output verbatim.
 199  */
 200 struct cell *
 201 table_add_cell(struct table *table)
 202 {
 203     size_t x, y;
 204
 205     ovs_assert(table->n_rows > 0);
 206     ovs_assert(table->current_column < table->n_columns);
 207
 208     x = table->current_column++;
 209     y = table->n_rows - 1;
 210
 211     return table_cell__(table, y, x);
 212 }
 213
 214 static void
 215 table_print_table_line__(struct ds *line)
 216 {
 217     puts(ds_cstr(line));
 218     ds_clear(line);
 219 }
 220
 221 static char *
 222 table_format_timestamp__(void)
 223 {
 224     return xastrftime("%Y-%m-%d %H:%M:%S", time_wall(), true);
 225 }
 226
 227 static void
 228 table_print_timestamp__(const struct table *table)
 229 {
 230     if (table->timestamp) {
 231         char *s = table_format_timestamp__();
 232         puts(s);
 233         free(s);
 234     }
 235 }
 236
 237 static void
 238 table_print_table__(const struct table *table, const struct table_style *style)
 239 {
 240     static int n = 0;
 241     struct ds line = DS_EMPTY_INITIALIZER;
 242     int *widths;
 243     size_t x, y;
 244
 245     if (n++ > 0) {
 246         putchar('\n');
 247     }
 248
 249     table_print_timestamp__(table);
 250
 251     if (table->caption) {
 252         puts(table->caption);
 253     }
 254
 255     widths = xmalloc(table->n_columns * sizeof *widths);
 256     for (x = 0; x < table->n_columns; x++) {
 257         const struct column *column = &table->columns[x];
 258
 259         widths[x] = strlen(column->heading);
 260         for (y = 0; y < table->n_rows; y++) {
 261             const char *text = cell_to_text(table_cell__(table, y, x), style);
 262             size_t length = strlen(text);
 263
 264             if (length > widths[x]) {
 265                 widths[x] = length;
 266             }
 267         }
 268     }
 269
 270     if (style->headings) {
 271         for (x = 0; x < table->n_columns; x++) {
 272             const struct column *column = &table->columns[x];
 273             if (x) {
 274                 ds_put_char(&line, ' ');
 275             }
 276             ds_put_format(&line, "%-*s", widths[x], column->heading);
 277         }
 278         table_print_table_line__(&line);
 279
 280         for (x = 0; x < table->n_columns; x++) {
 281             if (x) {
 282                 ds_put_char(&line, ' ');
 283             }
 284             ds_put_char_multiple(&line, '-', widths[x]);
 285         }
 286         table_print_table_line__(&line);
 287     }
 288
 289     for (y = 0; y < table->n_rows; y++) {
 290         for (x = 0; x < table->n_columns; x++) {
 291             const char *text = cell_to_text(table_cell__(table, y, x), style);
 292             if (x) {
 293                 ds_put_char(&line, ' ');
 294             }
 295             ds_put_format(&line, "%-*s", widths[x], text);
 296         }
 297         table_print_table_line__(&line);
 298     }
 299
 300     ds_destroy(&line);
 301     free(widths);
 302 }
 303
 304 static void
 305 table_print_list__(const struct table *table, const struct table_style *style)
 306 {
 307     static int n = 0;
 308     size_t x, y;
 309
 310     if (n++ > 0) {
 311         putchar('\n');
 312     }
 313
 314     table_print_timestamp__(table);
 315
 316     if (table->caption) {
 317         puts(table->caption);
 318     }
 319
 320     for (y = 0; y < table->n_rows; y++) {
 321         if (y > 0) {
 322             putchar('\n');
 323         }
 324         for (x = 0; x < table->n_columns; x++) {
 325             const char *text = cell_to_text(table_cell__(table, y, x), style);
 326             if (style->headings) {
 327                 printf("%-20s: ", table->columns[x].heading);
 328             }
 329             puts(text);
 330         }
 331     }
 332 }
 333
 334 static void
 335 table_escape_html_text__(const char *s, size_t n)
 336 {
 337     size_t i;
 338
 339     for (i = 0; i < n; i++) {
 340         char c = s[i];
 341
 342         switch (c) {
 343         case '&':
 344             fputs("&amp;", stdout);
 345             break;
 346         case '<':
 347             fputs("&lt;", stdout);
 348             break;
 349         case '>':
 350             fputs("&gt;", stdout);
 351             break;
 352         case '"':
 353             fputs("&quot;", stdout);
 354             break;
 355         default:
 356             putchar(c);
 357             break;
 358         }
 359     }
 360 }
 361
 362 static void
 363 table_print_html_cell__(const char *element, const char *content)
 364 {
 365     const char *p;
 366
 367     printf("    <%s>", element);
 368     for (p = content; *p; ) {
 369         struct uuid uuid;
 370
 371         if (uuid_from_string_prefix(&uuid, p)) {
 372             printf("<a href=\"#%.*s\">%.*s</a>", UUID_LEN, p, 8, p);
 373             p += UUID_LEN;
 374         } else {
 375             table_escape_html_text__(p, 1);
 376             p++;
 377         }
 378     }
 379     printf("</%s>\n", element);
 380 }
 381
 382 static void
 383 table_print_html__(const struct table *table, const struct table_style *style)
 384 {
 385     size_t x, y;
 386
 387     table_print_timestamp__(table);
 388
 389     fputs("<table border=1>\n", stdout);
 390
 391     if (table->caption) {
 392         table_print_html_cell__("caption", table->caption);
 393     }
 394
 395     if (style->headings) {
 396         fputs("  <tr>\n", stdout);
 397         for (x = 0; x < table->n_columns; x++) {
 398             const struct column *column = &table->columns[x];
 399             table_print_html_cell__("th", column->heading);
 400         }
 401         fputs("  </tr>\n", stdout);
 402     }
 403
 404     for (y = 0; y < table->n_rows; y++) {
 405         fputs("  <tr>\n", stdout);
 406         for (x = 0; x < table->n_columns; x++) {
 407             const char *content;
 408
 409             content = cell_to_text(table_cell__(table, y, x), style);
 410             if (!strcmp(table->columns[x].heading, "_uuid")) {
 411                 fputs("    <td><a name=\"", stdout);
 412                 table_escape_html_text__(content, strlen(content));
 413                 fputs("\">", stdout);
 414                 table_escape_html_text__(content, 8);
 415                 fputs("</a></td>\n", stdout);
 416             } else {
 417                 table_print_html_cell__("td", content);
 418             }
 419         }
 420         fputs("  </tr>\n", stdout);
 421     }
 422
 423     fputs("</table>\n", stdout);
 424 }
 425
 426 static void
 427 table_print_csv_cell__(const char *content)
 428 {
 429     const char *p;
 430
 431     if (!strpbrk(content, "\n\",")) {
 432         fputs(content, stdout);
 433     } else {
 434         putchar('"');
 435         for (p = content; *p != '\0'; p++) {
 436             switch (*p) {
 437             case '"':
 438                 fputs("\"\"", stdout);
 439                 break;
 440             default:
 441                 putchar(*p);
 442                 break;
 443             }
 444         }
 445         putchar('"');
 446     }
 447 }
 448
 449 static void
 450 table_print_csv__(const struct table *table, const struct table_style *style)
 451 {
 452     static int n = 0;
 453     size_t x, y;
 454
 455     if (n++ > 0) {
 456         putchar('\n');
 457     }
 458
 459     table_print_timestamp__(table);
 460
 461     if (table->caption) {
 462         puts(table->caption);
 463     }
 464
 465     if (style->headings) {
 466         for (x = 0; x < table->n_columns; x++) {
 467             const struct column *column = &table->columns[x];
 468             if (x) {
 469                 putchar(',');
 470             }
 471             table_print_csv_cell__(column->heading);
 472         }
 473         putchar('\n');
 474     }
 475
 476     for (y = 0; y < table->n_rows; y++) {
 477         for (x = 0; x < table->n_columns; x++) {
 478             if (x) {
 479                 putchar(',');
 480             }
 481             table_print_csv_cell__(cell_to_text(table_cell__(table, y, x),
 482                                                 style));
 483         }
 484         putchar('\n');
 485     }
 486 }
 487
 488 static void
 489 table_print_json__(const struct table *table, const struct table_style *style)
 490 {
 491     struct json *json, *headings, *data;
 492     size_t x, y;
 493     char *s;
 494
 495     json = json_object_create();
 496     if (table->caption) {
 497         json_object_put_string(json, "caption", table->caption);
 498     }
 499     if (table->timestamp) {
 500         char *s = table_format_timestamp__();
 501         json_object_put_string(json, "time", s);
 502         free(s);
 503     }
 504
 505     headings = json_array_create_empty();
 506     for (x = 0; x < table->n_columns; x++) {
 507         const struct column *column = &table->columns[x];
 508         json_array_add(headings, json_string_create(column->heading));
 509     }
 510     json_object_put(json, "headings", headings);
 511
 512     data = json_array_create_empty();
 513     for (y = 0; y < table->n_rows; y++) {
 514         struct json *row = json_array_create_empty();
 515         for (x = 0; x < table->n_columns; x++) {
 516             const struct cell *cell = table_cell__(table, y, x);
 517             if (cell->text) {
 518                 json_array_add(row, json_string_create(cell->text));
 519             } else if (cell->json) {
 520                 json_array_add(row, json_clone(cell->json));
 521             } else {
 522                 json_array_add(row, json_null_create());
 523             }
 524         }
 525         json_array_add(data, row);
 526     }
 527     json_object_put(json, "data", data);
 528
 529     s = json_to_string(json, style->json_flags);
 530     json_destroy(json);
 531     puts(s);
 532     free(s);
 533 }
 534 \f
 535 /* Parses 'format' as the argument to a --format command line option, updating
 536  * 'style->format'. */
 537 void
 538 table_parse_format(struct table_style *style, const char *format)
 539 {
 540     if (!strcmp(format, "table")) {
 541         style->format = TF_TABLE;
 542     } else if (!strcmp(format, "list")) {
 543         style->format = TF_LIST;
 544     } else if (!strcmp(format, "html")) {
 545         style->format = TF_HTML;
 546     } else if (!strcmp(format, "csv")) {
 547         style->format = TF_CSV;
 548     } else if (!strcmp(format, "json")) {
 549         style->format = TF_JSON;
 550     } else {
 551         ovs_fatal(0, "unknown output format \"%s\"", format);
 552     }
 553 }
 554
 555 /* Parses 'format' as the argument to a --data command line option, updating
 556  * 'style->cell_format'. */
 557 void
 558 table_parse_cell_format(struct table_style *style, const char *format)
 559 {
 560     if (!strcmp(format, "string")) {
 561         style->cell_format = CF_STRING;
 562     } else if (!strcmp(format, "bare")) {
 563         style->cell_format = CF_BARE;
 564     } else if (!strcmp(format, "json")) {
 565         style->cell_format = CF_JSON;
 566     } else {
 567         ovs_fatal(0, "unknown data format \"%s\"", format);
 568     }
 569 }
 570
 571 /* Outputs 'table' on stdout in the specified 'style'. */
 572 void
 573 table_print(const struct table *table, const struct table_style *style)
 574 {
 575     switch (style->format) {
 576     case TF_TABLE:
 577         table_print_table__(table, style);
 578         break;
 579
 580     case TF_LIST:
 581         table_print_list__(table, style);
 582         break;
 583
 584     case TF_HTML:
 585         table_print_html__(table, style);
 586         break;
 587
 588     case TF_CSV:
 589         table_print_csv__(table, style);
 590         break;
 591
 592     case TF_JSON:
 593         table_print_json__(table, style);
 594         break;
 595     }
 596 }