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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 // Highlighting text that matches the selection
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5 //
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6 // Defines an option highlightSelectionMatches, which, when enabled,
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7 // will style strings that match the selection throughout the
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8 // document.
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9 //
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10 // The option can be set to true to simply enable it, or to a
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11 // {minChars, style, wordsOnly, showToken, delay} object to explicitly
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12 // configure it. minChars is the minimum amount of characters that should be
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13 // selected for the behavior to occur, and style is the token style to
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14 // apply to the matches. This will be prefixed by "cm-" to create an
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15 // actual CSS class name. If wordsOnly is enabled, the matches will be
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16 // highlighted only if the selected text is a word. showToken, when enabled,
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17 // will cause the current token to be highlighted when nothing is selected.
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18 // delay is used to specify how much time to wait, in milliseconds, before
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19 // highlighting the matches. If annotateScrollbar is enabled, the occurrences
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20 // will be highlighted on the scrollbar via the matchesonscrollbar addon.
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21
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22 (function(mod) {
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23 if (typeof exports == "object" && typeof module == "object") // CommonJS
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24 mod(require("../../lib/codemirror"), require("./matchesonscrollbar"));
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25 else if (typeof define == "function" && define.amd) // AMD
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26 define(["../../lib/codemirror", "./matchesonscrollbar"], mod);
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27 else // Plain browser env
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28 mod(CodeMirror);
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29 })(function(CodeMirror) {
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30 "use strict";
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31
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32 var defaults = {
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33 style: "matchhighlight",
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34 minChars: 2,
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35 delay: 100,
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36 wordsOnly: false,
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37 annotateScrollbar: false,
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38 showToken: false,
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39 trim: true
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40 }
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41
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42 function State(options) {
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43 this.options = {}
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44 for (var name in defaults)
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45 this.options[name] = (options && options.hasOwnProperty(name) ? options : defaults)[name]
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46 this.overlay = this.timeout = null;
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47 this.matchesonscroll = null;
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48 this.active = false;
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49 }
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50
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51 CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {
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52 if (old && old != CodeMirror.Init) {
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53 removeOverlay(cm);
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54 clearTimeout(cm.state.matchHighlighter.timeout);
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55 cm.state.matchHighlighter = null;
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56 cm.off("cursorActivity", cursorActivity);
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57 cm.off("focus", onFocus)
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58 }
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59 if (val) {
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60 var state = cm.state.matchHighlighter = new State(val);
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61 if (cm.hasFocus()) {
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62 state.active = true
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63 highlightMatches(cm)
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64 } else {
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65 cm.on("focus", onFocus)
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66 }
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67 cm.on("cursorActivity", cursorActivity);
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68 }
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69 });
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70
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71 function cursorActivity(cm) {
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72 var state = cm.state.matchHighlighter;
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73 if (state.active || cm.hasFocus()) scheduleHighlight(cm, state)
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74 }
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75
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76 function onFocus(cm) {
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77 var state = cm.state.matchHighlighter
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78 if (!state.active) {
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79 state.active = true
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80 scheduleHighlight(cm, state)
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81 }
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82 }
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83
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84 function scheduleHighlight(cm, state) {
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85 clearTimeout(state.timeout);
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86 state.timeout = setTimeout(function() {highlightMatches(cm);}, state.options.delay);
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87 }
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88
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89 function addOverlay(cm, query, hasBoundary, style) {
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90 var state = cm.state.matchHighlighter;
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91 cm.addOverlay(state.overlay = makeOverlay(query, hasBoundary, style));
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92 if (state.options.annotateScrollbar && cm.showMatchesOnScrollbar) {
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93 var searchFor = hasBoundary ? new RegExp((/\w/.test(query.charAt(0)) ? "\\b" : "") +
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94 query.replace(/[\\\[.+*?(){|^$]/g, "\\$&") +
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95 (/\w/.test(query.charAt(query.length - 1)) ? "\\b" : "")) : query;
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96 state.matchesonscroll = cm.showMatchesOnScrollbar(searchFor, false,
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97 {className: "CodeMirror-selection-highlight-scrollbar"});
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98 }
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99 }
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100
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101 function removeOverlay(cm) {
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102 var state = cm.state.matchHighlighter;
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103 if (state.overlay) {
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104 cm.removeOverlay(state.overlay);
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105 state.overlay = null;
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106 if (state.matchesonscroll) {
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107 state.matchesonscroll.clear();
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108 state.matchesonscroll = null;
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109 }
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110 }
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111 }
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112
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113 function highlightMatches(cm) {
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114 cm.operation(function() {
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115 var state = cm.state.matchHighlighter;
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116 removeOverlay(cm);
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117 if (!cm.somethingSelected() && state.options.showToken) {
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118 var re = state.options.showToken === true ? /[\w$]/ : state.options.showToken;
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119 var cur = cm.getCursor(), line = cm.getLine(cur.line), start = cur.ch, end = start;
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120 while (start && re.test(line.charAt(start - 1))) --start;
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121 while (end < line.length && re.test(line.charAt(end))) ++end;
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122 if (start < end)
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123 addOverlay(cm, line.slice(start, end), re, state.options.style);
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124 return;
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125 }
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126 var from = cm.getCursor("from"), to = cm.getCursor("to");
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127 if (from.line != to.line) return;
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128 if (state.options.wordsOnly && !isWord(cm, from, to)) return;
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129 var selection = cm.getRange(from, to)
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130 if (state.options.trim) selection = selection.replace(/^\s+|\s+$/g, "")
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131 if (selection.length >= state.options.minChars)
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132 addOverlay(cm, selection, false, state.options.style);
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133 });
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134 }
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135
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136 function isWord(cm, from, to) {
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137 var str = cm.getRange(from, to);
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138 if (str.match(/^\w+$/) !== null) {
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139 if (from.ch > 0) {
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140 var pos = {line: from.line, ch: from.ch - 1};
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141 var chr = cm.getRange(pos, from);
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142 if (chr.match(/\W/) === null) return false;
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143 }
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144 if (to.ch < cm.getLine(from.line).length) {
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145 var pos = {line: to.line, ch: to.ch + 1};
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146 var chr = cm.getRange(to, pos);
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147 if (chr.match(/\W/) === null) return false;
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148 }
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149 return true;
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150 } else return false;
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151 }
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152
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153 function boundariesAround(stream, re) {
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154 return (!stream.start || !re.test(stream.string.charAt(stream.start - 1))) &&
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155 (stream.pos == stream.string.length || !re.test(stream.string.charAt(stream.pos)));
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156 }
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157
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158 function makeOverlay(query, hasBoundary, style) {
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159 return {token: function(stream) {
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160 if (stream.match(query) &&
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161 (!hasBoundary || boundariesAround(stream, hasBoundary)))
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162 return style;
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163 stream.next();
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164 stream.skipTo(query.charAt(0)) || stream.skipToEnd();
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165 }};
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166 }
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167 });
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