utils/parse.js

   1 // Utility to parse keysymdef.h to produce mappings from Unicode codepoints to keysyms
   2 "use strict";
   3
   4 var fs = require('fs');
   5
   6 var show_help = process.argv.length === 2;
   7 var filename;
   8
   9 for (var i = 2; i < process.argv.length; ++i) {
  10   switch (process.argv[i]) {
  11     case "--help":
  12     case "-h":
  13       show_help = true;
  14       break;
  15     case "--file":
  16     case "-f":
  17     default:
  18       filename = process.argv[i];
  19   }
  20 }
  21
  22 if (!filename) {
  23   show_help = true;
  24   console.log("Error: No filename specified\n");
  25 }
  26
  27 if (show_help) {
  28   console.log("Parses a *nix keysymdef.h to generate Unicode code point mappings");
  29   console.log("Usage: node parse.js [options] filename:");
  30   console.log("  -h [ --help ]                 Produce this help message");
  31   console.log("  filename                      The keysymdef.h file to parse");
  32   return;
  33 }
  34
  35 var buf = fs.readFileSync(filename);
  36 var str = buf.toString('utf8');
  37
  38 var re = /^\#define XK_([a-zA-Z_0-9]+)\s+0x([0-9a-fA-F]+)\s*(\/\*\s*(.*)\s*\*\/)?\s*$/m;
  39
  40 var arr = str.split('\n');
  41
  42 var codepoints = {};
  43
  44 for (var i = 0; i < arr.length; ++i) {
  45     var result = re.exec(arr[i]);
  46     if (result){
  47         var keyname = result[1];
  48         var keysym = parseInt(result[2], 16);
  49         var remainder = result[3];
  50
  51         var unicodeRes = /U\+([0-9a-fA-F]+)/.exec(remainder);
  52         if (unicodeRes) {
  53             var unicode = parseInt(unicodeRes[1], 16);
  54             if (!codepoints[unicode]){
  55                 codepoints[unicode] = keysym;
  56             }
  57         }
  58         else {
  59             console.log("no unicode codepoint found:", arr[i]);
  60         }
  61     }
  62     else {
  63         console.log("line is not a keysym:", arr[i]);
  64     }
  65 }
  66
  67 var out = "// This file describes mappings from Unicode codepoints to the keysym values\n" +
  68 "// (and optionally, key names) expected by the RFB protocol\n" +
  69 "// How this file was generated:\n" +
  70 "// " + process.argv.join(" ") + "\n" +
  71 "\n" +
  72 "var codepoints = {codepoints};\n" +
  73 "\n" +
  74 "export default {\n" +
  75 "    lookup : function(u) {\n" +
  76 "        var keysym = codepoints[u];\n" +
  77 "        if (keysym === undefined) {\n" +
  78 "            keysym = 0x01000000 | u;\n" +
  79 "        }\n" +
  80 "        return keysym;\n" +
  81 "    },\n" +
  82 "};\n";
  83 out = out.replace('{codepoints}', JSON.stringify(codepoints));
  84
  85 fs.writeFileSync("keysymdef.js", out);