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mark-selection.min.js (3846B)


      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     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 });