scheme.js 4.9 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. *
  30. * Contributor(s):
  31. *
  32. * NalaGinrut@gmail.com
  33. *
  34. * ***** END LICENSE BLOCK ***** */
  35. define(function(require, exports, module) {
  36. "use strict";
  37. var oop = require("../lib/oop");
  38. var TextMode = require("./text").Mode;
  39. var SchemeHighlightRules = require("./scheme_highlight_rules").SchemeHighlightRules;
  40. var MatchingParensOutdent = require("./matching_parens_outdent").MatchingParensOutdent;
  41. var Mode = function() {
  42. this.HighlightRules = SchemeHighlightRules;
  43. this.$outdent = new MatchingParensOutdent();
  44. };
  45. oop.inherits(Mode, TextMode);
  46. (function() {
  47. this.lineCommentStart = ";";
  48. this.minorIndentFunctions = ["define", "lambda", "define-macro", "define-syntax", "syntax-rules", "define-record-type", "define-structure"];
  49. this.$toIndent = function(str) {
  50. return str.split('').map(function(ch) {
  51. if (/\s/.exec(ch)) {
  52. return ch;
  53. } else {
  54. return ' ';
  55. }
  56. }).join('');
  57. };
  58. this.$calculateIndent = function(line, tab) {
  59. var baseIndent = this.$getIndent(line);
  60. var delta = 0;
  61. var isParen, ch;
  62. // Walk back from end of line, find matching braces
  63. for (var i = line.length - 1; i >= 0; i--) {
  64. ch = line[i];
  65. if (ch === '(') {
  66. delta--;
  67. isParen = true;
  68. } else if (ch === '(' || ch === '[' || ch === '{') {
  69. delta--;
  70. isParen = false;
  71. } else if (ch === ')' || ch === ']' || ch === '}') {
  72. delta++;
  73. }
  74. if (delta < 0) {
  75. break;
  76. }
  77. }
  78. if (delta < 0 && isParen) {
  79. // Were more brackets opened than closed and was a ( left open?
  80. i += 1;
  81. var iBefore = i;
  82. var fn = '';
  83. while (true) {
  84. ch = line[i];
  85. if (ch === ' ' || ch === '\t') {
  86. if(this.minorIndentFunctions.indexOf(fn) !== -1) {
  87. return this.$toIndent(line.substring(0, iBefore - 1) + tab);
  88. } else {
  89. return this.$toIndent(line.substring(0, i + 1));
  90. }
  91. } else if (ch === undefined) {
  92. return this.$toIndent(line.substring(0, iBefore - 1) + tab);
  93. }
  94. fn += line[i];
  95. i++;
  96. }
  97. } else if(delta < 0 && !isParen) {
  98. // Were more brackets openend than closed and was it not a (?
  99. return this.$toIndent(line.substring(0, i+1));
  100. } else if(delta > 0) {
  101. // Mere more brackets closed than opened? Outdent.
  102. baseIndent = baseIndent.substring(0, baseIndent.length - tab.length);
  103. return baseIndent;
  104. } else {
  105. // Were they nicely matched? Just indent like line before.
  106. return baseIndent;
  107. }
  108. };
  109. this.getNextLineIndent = function(state, line, tab) {
  110. return this.$calculateIndent(line, tab);
  111. };
  112. this.checkOutdent = function(state, line, input) {
  113. return this.$outdent.checkOutdent(line, input);
  114. };
  115. this.autoOutdent = function(state, doc, row) {
  116. this.$outdent.autoOutdent(doc, row);
  117. };
  118. this.$id = "ace/mode/scheme";
  119. }).call(Mode.prototype);
  120. exports.Mode = Mode;
  121. });