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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 // Because sometimes you need to mark the selected *text*.
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5 //
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6 // Adds an option 'styleSelectedText' which, when enabled, gives
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7 // selected text the CSS class given as option value, or
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8 // "CodeMirror-selectedtext" when the value is not a string.
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9
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10 (function(mod) {
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11 if (typeof exports == "object" && typeof module == "object") // CommonJS
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12 mod(require("../../lib/codemirror"));
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13 else if (typeof define == "function" && define.amd) // AMD
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14 define(["../../lib/codemirror"], mod);
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15 else // Plain browser env
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16 mod(CodeMirror);
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17 })(function(CodeMirror) {
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18 "use strict";
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19
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20 CodeMirror.defineOption("styleSelectedText", false, function(cm, val, old) {
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21 var prev = old && old != CodeMirror.Init;
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22 if (val && !prev) {
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23 cm.state.markedSelection = [];
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24 cm.state.markedSelectionStyle = typeof val == "string" ? val : "CodeMirror-selectedtext";
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25 reset(cm);
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26 cm.on("cursorActivity", onCursorActivity);
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27 cm.on("change", onChange);
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28 } else if (!val && prev) {
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29 cm.off("cursorActivity", onCursorActivity);
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30 cm.off("change", onChange);
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31 clear(cm);
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32 cm.state.markedSelection = cm.state.markedSelectionStyle = null;
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33 }
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34 });
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35
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36 function onCursorActivity(cm) {
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37 if (cm.state.markedSelection)
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38 cm.operation(function() { update(cm); });
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39 }
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40
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41 function onChange(cm) {
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42 if (cm.state.markedSelection && cm.state.markedSelection.length)
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43 cm.operation(function() { clear(cm); });
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44 }
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45
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46 var CHUNK_SIZE = 8;
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47 var Pos = CodeMirror.Pos;
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48 var cmp = CodeMirror.cmpPos;
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49
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50 function coverRange(cm, from, to, addAt) {
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51 if (cmp(from, to) == 0) return;
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52 var array = cm.state.markedSelection;
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53 var cls = cm.state.markedSelectionStyle;
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54 for (var line = from.line;;) {
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55 var start = line == from.line ? from : Pos(line, 0);
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56 var endLine = line + CHUNK_SIZE, atEnd = endLine >= to.line;
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57 var end = atEnd ? to : Pos(endLine, 0);
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58 var mark = cm.markText(start, end, {className: cls});
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59 if (addAt == null) array.push(mark);
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60 else array.splice(addAt++, 0, mark);
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61 if (atEnd) break;
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62 line = endLine;
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63 }
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64 }
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65
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66 function clear(cm) {
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67 var array = cm.state.markedSelection;
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68 for (var i = 0; i < array.length; ++i) array[i].clear();
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69 array.length = 0;
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70 }
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71
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72 function reset(cm) {
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73 clear(cm);
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74 var ranges = cm.listSelections();
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75 for (var i = 0; i < ranges.length; i++)
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76 coverRange(cm, ranges[i].from(), ranges[i].to());
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77 }
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78
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79 function update(cm) {
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80 if (!cm.somethingSelected()) return clear(cm);
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81 if (cm.listSelections().length > 1) return reset(cm);
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82
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83 var from = cm.getCursor("start"), to = cm.getCursor("end");
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84
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85 var array = cm.state.markedSelection;
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86 if (!array.length) return coverRange(cm, from, to);
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87
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88 var coverStart = array[0].find(), coverEnd = array[array.length - 1].find();
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89 if (!coverStart || !coverEnd || to.line - from.line <= CHUNK_SIZE ||
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90 cmp(from, coverEnd.to) >= 0 || cmp(to, coverStart.from) <= 0)
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91 return reset(cm);
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92
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93 while (cmp(from, coverStart.from) > 0) {
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94 array.shift().clear();
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95 coverStart = array[0].find();
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96 }
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97 if (cmp(from, coverStart.from) < 0) {
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98 if (coverStart.to.line - from.line < CHUNK_SIZE) {
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99 array.shift().clear();
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100 coverRange(cm, from, coverStart.to, 0);
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101 } else {
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102 coverRange(cm, from, coverStart.from, 0);
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103 }
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104 }
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105
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106 while (cmp(to, coverEnd.to) < 0) {
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107 array.pop().clear();
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108 coverEnd = array[array.length - 1].find();
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109 }
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110 if (cmp(to, coverEnd.to) > 0) {
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111 if (to.line - coverEnd.from.line < CHUNK_SIZE) {
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112 array.pop().clear();
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113 coverRange(cm, coverEnd.from, to);
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114 } else {
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115 coverRange(cm, coverEnd.to, to);
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116 }
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117 }
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118 }
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119 });
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