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1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
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2 // Distributed under an MIT license: https://codemirror.net/5/LICENSE
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3
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4 (function(mod) {
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5 if (typeof exports == "object" && typeof module == "object") // CommonJS
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6 mod(require("../../lib/codemirror"));
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7 else if (typeof define == "function" && define.amd) // AMD
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8 define(["../../lib/codemirror"], mod);
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9 else // Plain browser env
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10 mod(CodeMirror);
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11 })(function(CodeMirror) {
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12 var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
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13 (document.documentMode == null || document.documentMode < 8);
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14
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15 var Pos = CodeMirror.Pos;
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16
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17 var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<", "<": ">>", ">": "<<"};
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18
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19 function bracketRegex(config) {
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20 return config && config.bracketRegex || /[(){}[\]]/
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21 }
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22
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23 function findMatchingBracket(cm, where, config) {
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24 var line = cm.getLineHandle(where.line), pos = where.ch - 1;
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25 var afterCursor = config && config.afterCursor
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26 if (afterCursor == null)
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27 afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className)
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28 var re = bracketRegex(config)
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29
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30 // A cursor is defined as between two characters, but in vim command mode
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31 // (i.e. not insert mode), the cursor is visually represented as a
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32 // highlighted box on top of the 2nd character. Otherwise, we allow matches
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33 // from before or after the cursor.
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34 var match = (!afterCursor && pos >= 0 && re.test(line.text.charAt(pos)) && matching[line.text.charAt(pos)]) ||
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35 re.test(line.text.charAt(pos + 1)) && matching[line.text.charAt(++pos)];
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36 if (!match) return null;
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37 var dir = match.charAt(1) == ">" ? 1 : -1;
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38 if (config && config.strict && (dir > 0) != (pos == where.ch)) return null;
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39 var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));
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40
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41 var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style, config);
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42 if (found == null) return null;
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43 return {from: Pos(where.line, pos), to: found && found.pos,
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44 match: found && found.ch == match.charAt(0), forward: dir > 0};
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45 }
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46
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47 // bracketRegex is used to specify which type of bracket to scan
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48 // should be a regexp, e.g. /[[\]]/
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49 //
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50 // Note: If "where" is on an open bracket, then this bracket is ignored.
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51 //
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52 // Returns false when no bracket was found, null when it reached
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53 // maxScanLines and gave up
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54 function scanForBracket(cm, where, dir, style, config) {
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55 var maxScanLen = (config && config.maxScanLineLength) || 10000;
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56 var maxScanLines = (config && config.maxScanLines) || 1000;
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57
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58 var stack = [];
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59 var re = bracketRegex(config)
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60 var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
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61 : Math.max(cm.firstLine() - 1, where.line - maxScanLines);
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62 for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
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63 var line = cm.getLine(lineNo);
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64 if (!line) continue;
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65 var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;
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66 if (line.length > maxScanLen) continue;
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67 if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);
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68 for (; pos != end; pos += dir) {
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69 var ch = line.charAt(pos);
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70 if (re.test(ch) && (style === undefined ||
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71 (cm.getTokenTypeAt(Pos(lineNo, pos + 1)) || "") == (style || ""))) {
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72 var match = matching[ch];
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73 if (match && (match.charAt(1) == ">") == (dir > 0)) stack.push(ch);
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74 else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};
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75 else stack.pop();
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76 }
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77 }
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78 }
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79 return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null;
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80 }
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81
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82 function matchBrackets(cm, autoclear, config) {
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83 // Disable brace matching in long lines, since it'll cause hugely slow updates
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84 var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000,
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85 highlightNonMatching = config && config.highlightNonMatching;
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86 var marks = [], ranges = cm.listSelections();
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87 for (var i = 0; i < ranges.length; i++) {
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88 var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, config);
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89 if (match && (match.match || highlightNonMatching !== false) && cm.getLine(match.from.line).length <= maxHighlightLen) {
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90 var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
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91 marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));
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92 if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen)
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93 marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));
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94 }
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95 }
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96
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97 if (marks.length) {
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98 // Kludge to work around the IE bug from issue #1193, where text
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99 // input stops going to the textarea whenever this fires.
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100 if (ie_lt8 && cm.state.focused) cm.focus();
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101
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102 var clear = function() {
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103 cm.operation(function() {
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104 for (var i = 0; i < marks.length; i++) marks[i].clear();
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105 });
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106 };
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107 if (autoclear) setTimeout(clear, 800);
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108 else return clear;
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109 }
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110 }
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111
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112 function doMatchBrackets(cm) {
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113 cm.operation(function() {
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114 if (cm.state.matchBrackets.currentlyHighlighted) {
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115 cm.state.matchBrackets.currentlyHighlighted();
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116 cm.state.matchBrackets.currentlyHighlighted = null;
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117 }
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118 cm.state.matchBrackets.currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
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119 });
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120 }
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121
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122 function clearHighlighted(cm) {
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123 if (cm.state.matchBrackets && cm.state.matchBrackets.currentlyHighlighted) {
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124 cm.state.matchBrackets.currentlyHighlighted();
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125 cm.state.matchBrackets.currentlyHighlighted = null;
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126 }
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127 }
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128
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129 CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
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130 if (old && old != CodeMirror.Init) {
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131 cm.off("cursorActivity", doMatchBrackets);
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132 cm.off("focus", doMatchBrackets)
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133 cm.off("blur", clearHighlighted)
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134 clearHighlighted(cm);
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135 }
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136 if (val) {
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137 cm.state.matchBrackets = typeof val == "object" ? val : {};
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138 cm.on("cursorActivity", doMatchBrackets);
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139 cm.on("focus", doMatchBrackets)
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140 cm.on("blur", clearHighlighted)
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141 }
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142 });
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143
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144 CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
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145 CodeMirror.defineExtension("findMatchingBracket", function(pos, config, oldConfig){
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146 // Backwards-compatibility kludge
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147 if (oldConfig || typeof config == "boolean") {
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148 if (!oldConfig) {
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149 config = config ? {strict: true} : null
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150 } else {
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151 oldConfig.strict = config
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152 config = oldConfig
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153 }
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154 }
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155 return findMatchingBracket(this, pos, config)
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156 });
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157 CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){
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158 return scanForBracket(this, pos, dir, style, config);
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159 });
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160 });
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