github.com/elliott5/community@v0.14.1-0.20160709191136-823126fb026a/app/public/codemirror/addon/selection/mark-selection.js (about)

     1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
     2  // Distributed under an MIT license: http://codemirror.net/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      cm.operation(function() { update(cm); });
    38    }
    39  
    40    function onChange(cm) {
    41      if (cm.state.markedSelection.length)
    42        cm.operation(function() { clear(cm); });
    43    }
    44  
    45    var CHUNK_SIZE = 8;
    46    var Pos = CodeMirror.Pos;
    47    var cmp = CodeMirror.cmpPos;
    48  
    49    function coverRange(cm, from, to, addAt) {
    50      if (cmp(from, to) == 0) return;
    51      var array = cm.state.markedSelection;
    52      var cls = cm.state.markedSelectionStyle;
    53      for (var line = from.line;;) {
    54        var start = line == from.line ? from : Pos(line, 0);
    55        var endLine = line + CHUNK_SIZE, atEnd = endLine >= to.line;
    56        var end = atEnd ? to : Pos(endLine, 0);
    57        var mark = cm.markText(start, end, {className: cls});
    58        if (addAt == null) array.push(mark);
    59        else array.splice(addAt++, 0, mark);
    60        if (atEnd) break;
    61        line = endLine;
    62      }
    63    }
    64  
    65    function clear(cm) {
    66      var array = cm.state.markedSelection;
    67      for (var i = 0; i < array.length; ++i) array[i].clear();
    68      array.length = 0;
    69    }
    70  
    71    function reset(cm) {
    72      clear(cm);
    73      var ranges = cm.listSelections();
    74      for (var i = 0; i < ranges.length; i++)
    75        coverRange(cm, ranges[i].from(), ranges[i].to());
    76    }
    77  
    78    function update(cm) {
    79      if (!cm.somethingSelected()) return clear(cm);
    80      if (cm.listSelections().length > 1) return reset(cm);
    81  
    82      var from = cm.getCursor("start"), to = cm.getCursor("end");
    83  
    84      var array = cm.state.markedSelection;
    85      if (!array.length) return coverRange(cm, from, to);
    86  
    87      var coverStart = array[0].find(), coverEnd = array[array.length - 1].find();
    88      if (!coverStart || !coverEnd || to.line - from.line < CHUNK_SIZE ||
    89          cmp(from, coverEnd.to) >= 0 || cmp(to, coverStart.from) <= 0)
    90        return reset(cm);
    91  
    92      while (cmp(from, coverStart.from) > 0) {
    93        array.shift().clear();
    94        coverStart = array[0].find();
    95      }
    96      if (cmp(from, coverStart.from) < 0) {
    97        if (coverStart.to.line - from.line < CHUNK_SIZE) {
    98          array.shift().clear();
    99          coverRange(cm, from, coverStart.to, 0);
   100        } else {
   101          coverRange(cm, from, coverStart.from, 0);
   102        }
   103      }
   104  
   105      while (cmp(to, coverEnd.to) < 0) {
   106        array.pop().clear();
   107        coverEnd = array[array.length - 1].find();
   108      }
   109      if (cmp(to, coverEnd.to) > 0) {
   110        if (to.line - coverEnd.from.line < CHUNK_SIZE) {
   111          array.pop().clear();
   112          coverRange(cm, coverEnd.from, to);
   113        } else {
   114          coverRange(cm, coverEnd.to, to);
   115        }
   116      }
   117    }
   118  });