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