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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code, released March
* 31, 1998.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
*/
/**
File Name: 15.5.4.10-1.js
ECMA Section: 15.5.4.10 String.prototype.substring( start, end )
Description:
15.5.4.10 String.prototype.substring(start, end)
Returns a substring of the result of converting this object to a string,
starting from character position start and running to character position
end of the string. The result is a string value, not a String object.
If either argument is NaN or negative, it is replaced with zero; if either
argument is larger than the length of the string, it is replaced with the
length of the string.
If start is larger than end, they are swapped.
When the substring method is called with two arguments start and end, the
following steps are taken:
1. Call ToString, giving it the this value as its argument.
2. Call ToInteger(start).
3. Call ToInteger (end).
4. Compute the number of characters in Result(1).
5. Compute min(max(Result(2), 0), Result(4)).
6. Compute min(max(Result(3), 0), Result(4)).
7. Compute min(Result(5), Result(6)).
8. Compute max(Result(5), Result(6)).
9. Return a string whose length is the difference between Result(8) and
Result(7), containing characters from Result(1), namely the characters
with indices Result(7) through Result(8)1, in ascending order.
Note that the substring function is intentionally generic; it does not require
that its this value be a String object. Therefore it can be transferred to other
kinds of objects for use as a method.
Author: christine@netscape.com
Date: 12 november 1997
*/
var SECTION = "15.5.4.10-1";
var VERSION = "ECMA_1";
startTest();
var TITLE = "String.prototype.substring( start, end )";
writeHeaderToLog( SECTION + " "+ TITLE);
var testcases = getTestCases();
test();
function getTestCases() {
var array = new Array();
var item = 0;
array[item++] = new TestCase( SECTION, "String.prototype.substring.length", 2, String.prototype.substring.length );
array[item++] = new TestCase( SECTION, "delete String.prototype.substring.length", false, delete String.prototype.substring.length );
array[item++] = new TestCase( SECTION, "delete String.prototype.substring.length; String.prototype.substring.length", 2, eval("delete String.prototype.substring.length; String.prototype.substring.length") );
// test cases for when substring is called with no arguments.
// this is a string object
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); typeof s.substring()",
"string",
eval("var s = new String('this is a string object'); typeof s.substring()") );
array[item++] = new TestCase( SECTION,
"var s = new String(''); s.substring(1,0)",
"",
eval("var s = new String(''); s.substring(1,0)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(true, false)",
"t",
eval("var s = new String('this is a string object'); s.substring(false, true)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(NaN, Infinity)",
"this is a string object",
eval("var s = new String('this is a string object'); s.substring(NaN, Infinity)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(Infinity, NaN)",
"this is a string object",
eval("var s = new String('this is a string object'); s.substring(Infinity, NaN)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(Infinity, Infinity)",
"",
eval("var s = new String('this is a string object'); s.substring(Infinity, Infinity)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(-0.01, 0)",
"",
eval("var s = new String('this is a string object'); s.substring(-0.01,0)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(s.length, s.length)",
"",
eval("var s = new String('this is a string object'); s.substring(s.length, s.length)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(s.length+1, 0)",
"this is a string object",
eval("var s = new String('this is a string object'); s.substring(s.length+1, 0)") );
array[item++] = new TestCase( SECTION,
"var s = new String('this is a string object'); s.substring(-Infinity, -Infinity)",
"",
eval("var s = new String('this is a string object'); s.substring(-Infinity, -Infinity)") );
// this is not a String object, start is not an integer
array[item++] = new TestCase( SECTION,
"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(Infinity,-Infinity)",
"1,2,3,4,5",
eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(Infinity,-Infinity)") );
array[item++] = new TestCase( SECTION,
"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true, false)",
"1",
eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true, false)") );
array[item++] = new TestCase( SECTION,
"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4', '5')",
"3",
eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4', '5')") );
// this is an object object
array[item++] = new TestCase( SECTION,
"var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,0)",
"[object ",
eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,0)") );
array[item++] = new TestCase( SECTION,
"var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,obj.toString().length)",
"Object]",
eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8, obj.toString().length)") );
// this is a function object
array[item++] = new TestCase( SECTION,
"var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8, Infinity)",
"Function]",
eval("var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8,Infinity)") );
// this is a number object
array[item++] = new TestCase( SECTION,
"var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(Infinity, NaN)",
"NaN",
eval("var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(Infinity, NaN)") );
// this is the Math object
array[item++] = new TestCase( SECTION,
"var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI, -10)",
"[ob",
eval("var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI, -10)") );
// this is a Boolean object
array[item++] = new TestCase( SECTION,
"var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array(), new Boolean(1))",
"f",
eval("var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array(), new Boolean(1))") );
// this is a user defined object
array[item++] = new TestCase( SECTION,
"var obj = new MyObject( void 0 ); obj.substring(0, 100)",
"undefined",
eval( "var obj = new MyObject( void 0 ); obj.substring(0,100)") );
return array;
}
function test() {
for ( tc=0; tc < testcases.length; tc++ ) {
testcases[tc].passed = writeTestCaseResult(
testcases[tc].expect,
testcases[tc].actual,
testcases[tc].description +" = "+
testcases[tc].actual );
testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
}
stopTest();
return ( testcases );
}
function MyObject( value ) {
this.value = value;
this.substring = String.prototype.substring;
this.toString = new Function ( "return this.value+''" );
}
|
