/trunk/jsdoc-toolkit/app/frame/String.js

 1/**
 2	@name String
 3	@class Additions to the core string object.
 4*/
 5
 6/** @author Steven Levithan, released as public domain. */
 7String.prototype.trim = function() {
 8	var str = this.replace(/^\s+/, '');
 9	for (var i = str.length - 1; i >= 0; i--) {
10		if (/\S/.test(str.charAt(i))) {
11			str = str.substring(0, i + 1);
12			break;
13		}
14	}
15	return str;
16}
17/*t:
18	plan(6, "Testing String.prototype.trim.");
19	
20	var s = "   a bc   ".trim();
21	is(s, "a bc", "multiple spaces front and back are trimmed.");
22
23	s = "a bc\n\n".trim();
24	is(s, "a bc", "newlines only in back are trimmed.");
25	
26	s = "\ta bc".trim();
27	is(s, "a bc", "tabs only in front are trimmed.");
28	
29	s = "\n \t".trim();
30	is(s, "", "an all-space string is trimmed to empty.");
31	
32	s = "a b\nc".trim();
33	is(s, "a b\nc", "a string with no spaces in front or back is trimmed to itself.");
34	
35	s = "".trim();
36	is(s, "", "an empty string is trimmed to empty.");
37
38*/
39
40String.prototype.balance = function(open, close) {
41	var i = 0;
42	while (this.charAt(i) != open) {
43		if (i == this.length) return [-1, -1];
44		i++;
45	}
46	
47	var j = i+1;
48	var balance = 1;
49	while (j < this.length) {
50		if (this.charAt(j) == open) balance++;
51		if (this.charAt(j) == close) balance--;
52		if (balance == 0) break;
53		j++;
54		if (j == this.length) return [-1, -1];
55	}
56	
57	return [i, j];
58}
59/*t:
60	plan(16, "Testing String.prototype.balance.");
61	
62	var s = "{abc}".balance("{","}");
63	is(s[0], 0, "opener in first is found.");
64	is(s[1], 4, "closer in last is found.");
65	
66	s = "ab{c}de".balance("{","}");
67	is(s[0], 2, "opener in middle is found.");
68	is(s[1], 4, "closer in middle is found.");
69	
70	s = "a{b{c}de}f".balance("{","}");
71	is(s[0], 1, "nested opener is found.");
72	is(s[1], 8, "nested closer is found.");
73	
74	s = "{}".balance("{","}");
75	is(s[0], 0, "opener with no content is found.");
76	is(s[1], 1, "closer with no content is found.");
77	
78	s = "".balance("{","}");
79	is(s[0], -1, "empty string opener is -1.");
80	is(s[1], -1, "empty string closer is -1.");
81	
82	s = "{abc".balance("{","}");
83	is(s[0], -1, "opener with no closer returns -1.");
84	is(s[1], -1, "no closer returns -1.");
85	
86	s = "abc".balance("{","}");
87	is(s[0], -1, "no opener or closer returns -1 for opener.");
88	is(s[1], -1, "no opener or closer returns -1 for closer.");
89	
90	s = "a<bc}de".balance("<","}");
91	is(s[0], 1, "unmatching opener is found.");
92	is(s[1], 4, "unmatching closer is found.");
93*/