wcfsetup/install/files/js/3rdParty/codemirror/addon/selection/mark-selection.js

   1 // Because sometimes you need to mark the selected *text*.
   2 //
   3 // Adds an option 'styleSelectedText' which, when enabled, gives
   4 // selected text the CSS class given as option value, or
   5 // "CodeMirror-selectedtext" when the value is not a string.
   6
   7 (function() {
   8   "use strict";
   9
  10   CodeMirror.defineOption("styleSelectedText", false, function(cm, val, old) {
  11     var prev = old && old != CodeMirror.Init;
  12     if (val && !prev) {
  13       cm.state.markedSelection = [];
  14       cm.state.markedSelectionStyle = typeof val == "string" ? val : "CodeMirror-selectedtext";
  15       reset(cm);
  16       cm.on("cursorActivity", onCursorActivity);
  17       cm.on("change", onChange);
  18     } else if (!val && prev) {
  19       cm.off("cursorActivity", onCursorActivity);
  20       cm.off("change", onChange);
  21       clear(cm);
  22       cm.state.markedSelection = cm.state.markedSelectionStyle = null;
  23     }
  24   });
  25
  26   function onCursorActivity(cm) {
  27     cm.operation(function() { update(cm); });
  28   }
  29
  30   function onChange(cm) {
  31     if (cm.state.markedSelection.length)
  32       cm.operation(function() { clear(cm); });
  33   }
  34
  35   var CHUNK_SIZE = 8;
  36   var Pos = CodeMirror.Pos;
  37
  38   function cmp(pos1, pos2) {
  39     return pos1.line - pos2.line || pos1.ch - pos2.ch;
  40   }
  41
  42   function coverRange(cm, from, to, addAt) {
  43     if (cmp(from, to) == 0) return;
  44     var array = cm.state.markedSelection;
  45     var cls = cm.state.markedSelectionStyle;
  46     for (var line = from.line;;) {
  47       var start = line == from.line ? from : Pos(line, 0);
  48       var endLine = line + CHUNK_SIZE, atEnd = endLine >= to.line;
  49       var end = atEnd ? to : Pos(endLine, 0);
  50       var mark = cm.markText(start, end, {className: cls});
  51       if (addAt == null) array.push(mark);
  52       else array.splice(addAt++, 0, mark);
  53       if (atEnd) break;
  54       line = endLine;
  55     }
  56   }
  57
  58   function clear(cm) {
  59     var array = cm.state.markedSelection;
  60     for (var i = 0; i < array.length; ++i) array[i].clear();
  61     array.length = 0;
  62   }
  63
  64   function reset(cm) {
  65     clear(cm);
  66     var from = cm.getCursor("start"), to = cm.getCursor("end");
  67     coverRange(cm, from, to);
  68   }
  69
  70   function update(cm) {
  71     var from = cm.getCursor("start"), to = cm.getCursor("end");
  72     if (cmp(from, to) == 0) return clear(cm);
  73
  74     var array = cm.state.markedSelection;
  75     if (!array.length) return coverRange(cm, from, to);
  76
  77     var coverStart = array[0].find(), coverEnd = array[array.length - 1].find();
  78     if (!coverStart || !coverEnd || to.line - from.line < CHUNK_SIZE ||
  79         cmp(from, coverEnd.to) >= 0 || cmp(to, coverStart.from) <= 0)
  80       return reset(cm);
  81
  82     while (cmp(from, coverStart.from) > 0) {
  83       array.shift().clear();
  84       coverStart = array[0].find();
  85     }
  86     if (cmp(from, coverStart.from) < 0) {
  87       if (coverStart.to.line - from.line < CHUNK_SIZE) {
  88         array.shift().clear();
  89         coverRange(cm, from, coverStart.to, 0);
  90       } else {
  91         coverRange(cm, from, coverStart.from, 0);
  92       }
  93     }
  94
  95     while (cmp(to, coverEnd.to) < 0) {
  96       array.pop().clear();
  97       coverEnd = array[array.length - 1].find();
  98     }
  99     if (cmp(to, coverEnd.to) > 0) {
 100       if (to.line - coverEnd.from.line < CHUNK_SIZE) {
 101         array.pop().clear();
 102         coverRange(cm, coverEnd.from, to);
 103       } else {
 104         coverRange(cm, coverEnd.to, to);
 105       }
 106     }
 107   }
 108 })();