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comparison: js/src/builtin/String.js

js/src/builtin/String.js

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TOR_BUG_3246
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-1:000000000000 0:8e182ce0a448
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4
5 /*global intl_Collator: false, */
6
7 /* ES6 Draft September 5, 2013 21.1.3.3 */
8 function String_codePointAt(pos) {
9 // Steps 1-3.
10 CheckObjectCoercible(this);
11 var S = ToString(this);
12
13 // Steps 4-5.
14 var position = ToInteger(pos);
15
16 // Step 6.
17 var size = S.length;
18
19 // Step 7.
20 if (position < 0 || position >= size)
21 return undefined;
22
23 // Steps 8-9.
24 var first = callFunction(std_String_charCodeAt, S, position);
25 if (first < 0xD800 || first > 0xDBFF || position + 1 === size)
26 return first;
27
28 // Steps 10-11.
29 var second = callFunction(std_String_charCodeAt, S, position + 1);
30 if (second < 0xDC00 || second > 0xDFFF)
31 return first;
32
33 // Step 12.
34 return (first - 0xD800) * 0x400 + (second - 0xDC00) + 0x10000;
35 }
36
37 var collatorCache = new Record();
38
39 /* ES6 20121122 draft 15.5.4.21. */
40 function String_repeat(count) {
41 // Steps 1-3.
42 CheckObjectCoercible(this);
43 var S = ToString(this);
44
45 // Steps 4-5.
46 var n = ToInteger(count);
47
48 // Steps 6-7.
49 if (n < 0)
50 ThrowError(JSMSG_NEGATIVE_REPETITION_COUNT); // a RangeError
51
52 if (!(n * S.length < (1 << 28)))
53 ThrowError(JSMSG_RESULTING_STRING_TOO_LARGE); // a RangeError
54
55 // Communicate |n|'s possible range to the compiler.
56 n = n & ((1 << 28) - 1);
57
58 // Steps 8-9.
59 var T = "";
60 for (;;) {
61 if (n & 1)
62 T += S;
63 n >>= 1;
64 if (n)
65 S += S;
66 else
67 break;
68 }
69 return T;
70 }
71
72 #define STRING_ITERATOR_SLOT_ITERATED_OBJECT 0
73 #define STRING_ITERATOR_SLOT_NEXT_INDEX 1
74
75 // ES6 draft specification, section 21.1.3.27, version 2013-09-27.
76 function String_iterator() {
77 CheckObjectCoercible(this);
78 var S = ToString(this);
79 var iterator = NewStringIterator();
80 UnsafeSetReservedSlot(iterator, STRING_ITERATOR_SLOT_ITERATED_OBJECT, S);
81 UnsafeSetReservedSlot(iterator, STRING_ITERATOR_SLOT_NEXT_INDEX, 0);
82 return iterator;
83 }
84
85 function StringIteratorIdentity() {
86 return this;
87 }
88
89 function StringIteratorNext() {
90 // FIXME: Cross-compartment wrapper StringIterator objects should pass this test. Bug 924059.
91 if (!IsObject(this) || !IsStringIterator(this))
92 ThrowError(JSMSG_INCOMPATIBLE_METHOD, "StringIterator", "next", ToString(this));
93
94 var S = UnsafeGetReservedSlot(this, STRING_ITERATOR_SLOT_ITERATED_OBJECT);
95 var index = UnsafeGetReservedSlot(this, STRING_ITERATOR_SLOT_NEXT_INDEX);
96 var size = S.length;
97
98 if (index >= size) {
99 return { value: undefined, done: true };
100 }
101
102 var charCount = 1;
103 var first = callFunction(std_String_charCodeAt, S, index);
104 if (first >= 0xD800 && first <= 0xDBFF && index + 1 < size) {
105 var second = callFunction(std_String_charCodeAt, S, index + 1);
106 if (second >= 0xDC00 && second <= 0xDFFF) {
107 charCount = 2;
108 }
109 }
110
111 UnsafeSetReservedSlot(this, STRING_ITERATOR_SLOT_NEXT_INDEX, index + charCount);
112 var value = callFunction(std_String_substring, S, index, index + charCount);
113
114 return { value: value, done: false };
115 }
116
117 /**
118 * Compare this String against that String, using the locale and collation
119 * options provided.
120 *
121 * Spec: ECMAScript Internationalization API Specification, 13.1.1.
122 */
123 function String_localeCompare(that) {
124 // Steps 1-3.
125 CheckObjectCoercible(this);
126 var S = ToString(this);
127 var That = ToString(that);
128
129 // Steps 4-5.
130 var locales = arguments.length > 1 ? arguments[1] : undefined;
131 var options = arguments.length > 2 ? arguments[2] : undefined;
132
133 // Step 6.
134 var collator;
135 if (locales === undefined && options === undefined) {
136 // This cache only optimizes for the old ES5 localeCompare without
137 // locales and options.
138 if (collatorCache.collator === undefined)
139 collatorCache.collator = intl_Collator(locales, options);
140 collator = collatorCache.collator;
141 } else {
142 collator = intl_Collator(locales, options);
143 }
144
145 // Step 7.
146 return intl_CompareStrings(collator, S, That);
147 }
148
149 /* ES6 Draft September 5, 2013 21.1.2.2 */
150 function String_static_fromCodePoint() {
151 // Step 1. is not relevant
152 // Step 2.
153 var length = arguments.length;
154
155 // Step 3.
156 var elements = new List();
157
158 // Step 4-5., 5g.
159 for (var nextIndex = 0; nextIndex < length; nextIndex++) {
160 // Step 5a.
161 var next = arguments[nextIndex];
162 // Step 5b-c.
163 var nextCP = ToNumber(next);
164
165 // Step 5d.
166 if (nextCP !== ToInteger(nextCP) || std_isNaN(nextCP))
167 ThrowError(JSMSG_NOT_A_CODEPOINT, ToString(nextCP));
168
169 // Step 5e.
170 if (nextCP < 0 || nextCP > 0x10FFFF)
171 ThrowError(JSMSG_NOT_A_CODEPOINT, ToString(nextCP));
172
173 // Step 5f.
174 // Inlined UTF-16 Encoding
175 if (nextCP <= 0xFFFF) {
176 elements.push(nextCP);
177 continue;
178 }
179
180 elements.push((((nextCP - 0x10000) / 0x400) | 0) + 0xD800);
181 elements.push((nextCP - 0x10000) % 0x400 + 0xDC00);
182 }
183
184 // Step 6.
185 return callFunction(std_Function_apply, std_String_fromCharCode, null, elements);
186 }
187
188 /**
189 * Compare String str1 against String str2, using the locale and collation
190 * options provided.
191 *
192 * Mozilla proprietary.
193 * Spec: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String#String_generic_methods
194 */
195 function String_static_localeCompare(str1, str2) {
196 if (arguments.length < 1)
197 ThrowError(JSMSG_MISSING_FUN_ARG, 0, "String.localeCompare");
198 var locales = arguments.length > 2 ? arguments[2] : undefined;
199 var options = arguments.length > 3 ? arguments[3] : undefined;
200 return callFunction(String_localeCompare, str1, str2, locales, options);
201 }
202

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