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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
Copyright (c) 2006 Lawrence Oluyede <l.oluyede@gmail.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
/*
startsWith(str, prefix[, start[, end]]) -> bool
Return true if str ends with the specified prefix, false otherwise.
With optional start, test str beginning at that position.
With optional end, stop comparing str at that position.
prefix can also be an array of strings to try.
*/
var EXPORTED_SYMBOLS = ['startsWith', 'endsWith'];
function startsWith(str, prefix, start, end) {
if (arguments.length < 2) {
throw new TypeError('startsWith() requires at least 2 arguments');
}
// check if start and end are null/undefined or a 'number'
if ((start == null) || (isNaN(new Number(start)))) {
start = 0;
}
if ((end == null) || (isNaN(new Number(end)))) {
end = Number.MAX_VALUE;
}
// if it's an array
if (typeof prefix == "object") {
for (var i = 0, j = prefix.length; i < j; i++) {
var res = _stringTailMatch(str, prefix[i], start, end, true);
if (res) {
return true;
}
}
return false;
}
return _stringTailMatch(str, prefix, start, end, true);
}
/*
endsWith(str, suffix[, start[, end]]) -> bool
Return true if str ends with the specified suffix, false otherwise.
With optional start, test str beginning at that position.
With optional end, stop comparing str at that position.
suffix can also be an array of strings to try.
*/
function endsWith(str, suffix, start, end) {
if (arguments.length < 2) {
throw new TypeError('endsWith() requires at least 2 arguments');
}
// check if start and end are null/undefined or a 'number'
if ((start == null) || (isNaN(new Number(start)))) {
start = 0;
}
if ((end == null) || (isNaN(new Number(end)))) {
end = Number.MAX_VALUE;
}
// if it's an array
if (typeof suffix == "object") {
for (var i = 0, j = suffix.length; i < j; i++) {
var res = _stringTailMatch(str, suffix[i], start, end, false);
if (res) {
return true;
}
}
return false;
}
return _stringTailMatch(str, suffix, start, end, false);
}
/*
Matches the end (direction == false) or start (direction == true) of str
against substr, using the start and end arguments. Returns false
if not found and true if found.
*/
function _stringTailMatch(str, substr, start, end, fromStart) {
var len = str.length;
var slen = substr.length;
var indices = _adjustIndices(start, end, len);
start = indices[0]; end = indices[1]; len = indices[2];
if (fromStart) {
if (start + slen > len) {
return false;
}
} else {
if (end - start < slen || start > len) {
return false;
}
if (end - slen > start) {
start = end - slen;
}
}
if (end - start >= slen) {
return str.substr(start, slen) == substr;
}
return false;
}
function _adjustIndices(start, end, len)
{
if (end > len) {
end = len;
} else if (end < 0) {
end += len;
}
if (end < 0) {
end = 0;
}
if (start < 0) {
start += len;
}
if (start < 0) {
start = 0;
}
return [start, end, len];
}
|
