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
| 'use strict';
| module.exports = balanced;
| function balanced(a, b, str) {
| if (a instanceof RegExp) a = maybeMatch(a, str);
| if (b instanceof RegExp) b = maybeMatch(b, str);
|
| var r = range(a, b, str);
|
| return r && {
| start: r[0],
| end: r[1],
| pre: str.slice(0, r[0]),
| body: str.slice(r[0] + a.length, r[1]),
| post: str.slice(r[1] + b.length)
| };
| }
|
| function maybeMatch(reg, str) {
| var m = str.match(reg);
| return m ? m[0] : null;
| }
|
| balanced.range = range;
| function range(a, b, str) {
| var begs, beg, left, right, result;
| var ai = str.indexOf(a);
| var bi = str.indexOf(b, ai + 1);
| var i = ai;
|
| if (ai >= 0 && bi > 0) {
| if(a===b) {
| return [ai, bi];
| }
| begs = [];
| left = str.length;
|
| while (i >= 0 && !result) {
| if (i == ai) {
| begs.push(i);
| ai = str.indexOf(a, i + 1);
| } else if (begs.length == 1) {
| result = [ begs.pop(), bi ];
| } else {
| beg = begs.pop();
| if (beg < left) {
| left = beg;
| right = bi;
| }
|
| bi = str.indexOf(b, i + 1);
| }
|
| i = ai < bi && ai >= 0 ? ai : bi;
| }
|
| if (begs.length) {
| result = [ left, right ];
| }
| }
|
| return result;
| }
|
|
