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  1. // CodeMirror, copyright (c) by Marijn Haverbeke and others
  2. // Distributed under an MIT license: https://codemirror.net/5/LICENSE
  3.  
  4. // Because sometimes you need to mark the selected *text*.
  5. //
  6. // Adds an option 'styleSelectedText' which, when enabled, gives
  7. // selected text the CSS class given as option value, or
  8. // "CodeMirror-selectedtext" when the value is not a string.
  9.  
  10. (function(mod) {
  11.   if (typeof exports == "object" && typeof module == "object") // CommonJS
  12.     mod(require("../../lib/codemirror"));
  13.   else if (typeof define == "function" && define.amd) // AMD
  14.     define(["../../lib/codemirror"], mod);
  15.   else // Plain browser env
  16.     mod(CodeMirror);
  17. })(function(CodeMirror) {
  18.   "use strict";
  19.  
  20.   CodeMirror.defineOption("styleSelectedText", false, function(cm, val, old) {
  21.     var prev = old && old != CodeMirror.Init;
  22.     if (val && !prev) {
  23.       cm.state.markedSelection = [];
  24.       cm.state.markedSelectionStyle = typeof val == "string" ? val : "CodeMirror-selectedtext";
  25.       reset(cm);
  26.       cm.on("cursorActivity", onCursorActivity);
  27.       cm.on("change", onChange);
  28.     } else if (!val && prev) {
  29.       cm.off("cursorActivity", onCursorActivity);
  30.       cm.off("change", onChange);
  31.       clear(cm);
  32.       cm.state.markedSelection = cm.state.markedSelectionStyle = null;
  33.     }
  34.   });
  35.  
  36.   function onCursorActivity(cm) {
  37.     if (cm.state.markedSelection)
  38.       cm.operation(function() { update(cm); });
  39.   }
  40.  
  41.   function onChange(cm) {
  42.     if (cm.state.markedSelection && cm.state.markedSelection.length)
  43.       cm.operation(function() { clear(cm); });
  44.   }
  45.  
  46.   var CHUNK_SIZE = 8;
  47.   var Pos = CodeMirror.Pos;
  48.   var cmp = CodeMirror.cmpPos;
  49.  
  50.   function coverRange(cm, from, to, addAt) {
  51.     if (cmp(from, to) == 0) return;
  52.     var array = cm.state.markedSelection;
  53.     var cls = cm.state.markedSelectionStyle;
  54.     for (var line = from.line;;) {
  55.       var start = line == from.line ? from : Pos(line, 0);
  56.       var endLine = line + CHUNK_SIZE, atEnd = endLine >= to.line;
  57.       var end = atEnd ? to : Pos(endLine, 0);
  58.       var mark = cm.markText(start, end, {className: cls});
  59.       if (addAt == null) array.push(mark);
  60.       else array.splice(addAt++, 0, mark);
  61.       if (atEnd) break;
  62.       line = endLine;
  63.     }
  64.   }
  65.  
  66.   function clear(cm) {
  67.     var array = cm.state.markedSelection;
  68.     for (var i = 0; i < array.length; ++i) array[i].clear();
  69.     array.length = 0;
  70.   }
  71.  
  72.   function reset(cm) {
  73.     clear(cm);
  74.     var ranges = cm.listSelections();
  75.     for (var i = 0; i < ranges.length; i++)
  76.       coverRange(cm, ranges[i].from(), ranges[i].to());
  77.   }
  78.  
  79.   function update(cm) {
  80.     if (!cm.somethingSelected()) return clear(cm);
  81.     if (cm.listSelections().length > 1) return reset(cm);
  82.  
  83.     var from = cm.getCursor("start"), to = cm.getCursor("end");
  84.  
  85.     var array = cm.state.markedSelection;
  86.     if (!array.length) return coverRange(cm, from, to);
  87.  
  88.     var coverStart = array[0].find(), coverEnd = array[array.length - 1].find();
  89.     if (!coverStart || !coverEnd || to.line - from.line <= CHUNK_SIZE ||
  90.         cmp(from, coverEnd.to) >= 0 || cmp(to, coverStart.from) <= 0)
  91.       return reset(cm);
  92.  
  93.     while (cmp(from, coverStart.from) > 0) {
  94.       array.shift().clear();
  95.       coverStart = array[0].find();
  96.     }
  97.     if (cmp(from, coverStart.from) < 0) {
  98.       if (coverStart.to.line - from.line < CHUNK_SIZE) {
  99.         array.shift().clear();
  100.         coverRange(cm, from, coverStart.to, 0);
  101.       } else {
  102.         coverRange(cm, from, coverStart.from, 0);
  103.       }
  104.     }
  105.  
  106.     while (cmp(to, coverEnd.to) < 0) {
  107.       array.pop().clear();
  108.       coverEnd = array[array.length - 1].find();
  109.     }
  110.     if (cmp(to, coverEnd.to) > 0) {
  111.       if (to.line - coverEnd.from.line < CHUNK_SIZE) {
  112.         array.pop().clear();
  113.         coverRange(cm, coverEnd.from, to);
  114.       } else {
  115.         coverRange(cm, coverEnd.to, to);
  116.       }
  117.     }
  118.   }
  119. });
  120.