text_completer.js 3.2 KB

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  1. /* ***** BEGIN LICENSE BLOCK *****
  2. * Distributed under the BSD license:
  3. *
  4. * Copyright (c) 2012, Ajax.org B.V.
  5. * All rights reserved.
  6. *
  7. * Redistribution and use in source and binary forms, with or without
  8. * modification, are permitted provided that the following conditions are met:
  9. * * Redistributions of source code must retain the above copyright
  10. * notice, this list of conditions and the following disclaimer.
  11. * * Redistributions in binary form must reproduce the above copyright
  12. * notice, this list of conditions and the following disclaimer in the
  13. * documentation and/or other materials provided with the distribution.
  14. * * Neither the name of Ajax.org B.V. nor the
  15. * names of its contributors may be used to endorse or promote products
  16. * derived from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  19. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20. * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21. * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
  22. * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23. * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28. *
  29. * ***** END LICENSE BLOCK ***** */
  30. define(function(require, exports, module) {
  31. var Range = require("../range").Range;
  32. var splitRegex = /[^a-zA-Z_0-9\$\-\u00C0-\u1FFF\u2C00-\uD7FF\w]+/;
  33. function getWordIndex(doc, pos) {
  34. var textBefore = doc.getTextRange(Range.fromPoints({row: 0, column:0}, pos));
  35. return textBefore.split(splitRegex).length - 1;
  36. }
  37. /**
  38. * Does a distance analysis of the word `prefix` at position `pos` in `doc`.
  39. * @return Map
  40. */
  41. function wordDistance(doc, pos) {
  42. var prefixPos = getWordIndex(doc, pos);
  43. var words = doc.getValue().split(splitRegex);
  44. var wordScores = Object.create(null);
  45. var currentWord = words[prefixPos];
  46. words.forEach(function(word, idx) {
  47. if (!word || word === currentWord) return;
  48. var distance = Math.abs(prefixPos - idx);
  49. var score = words.length - distance;
  50. if (wordScores[word]) {
  51. wordScores[word] = Math.max(score, wordScores[word]);
  52. } else {
  53. wordScores[word] = score;
  54. }
  55. });
  56. return wordScores;
  57. }
  58. exports.getCompletions = function(editor, session, pos, prefix, callback) {
  59. var wordScore = wordDistance(session, pos, prefix);
  60. var wordList = Object.keys(wordScore);
  61. callback(null, wordList.map(function(word) {
  62. return {
  63. caption: word,
  64. value: word,
  65. score: wordScore[word],
  66. meta: "local"
  67. };
  68. }));
  69. };
  70. });