string-slices.js revision 85b71799222b55eb5dd74ea26efe0c64ab655c8c 
1// Copyright 2008 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --string-slices --expose-externalize-string
29
30var s = 'abcdefghijklmn';
31assertEquals(s, s.substr());
32assertEquals(s, s.substr(0));
33assertEquals(s, s.substr('0'));
34assertEquals(s, s.substr(void 0));
35assertEquals(s, s.substr(null));
36assertEquals(s, s.substr(false));
37assertEquals(s, s.substr(0.9));
38assertEquals(s, s.substr({ valueOf: function() { return 0; } }));
39assertEquals(s, s.substr({ toString: function() { return '0'; } }));
40
41var s1 = s.substring(1);
42assertEquals(s1, s.substr(1));
43assertEquals(s1, s.substr('1'));
44assertEquals(s1, s.substr(true));
45assertEquals(s1, s.substr(1.1));
46assertEquals(s1, s.substr({ valueOf: function() { return 1; } }));
47assertEquals(s1, s.substr({ toString: function() { return '1'; } }));
48
49
50assertEquals(s.substring(s.length - 1), s.substr(-1));
51assertEquals(s.substring(s.length - 1), s.substr(-1.2));
52assertEquals(s.substring(s.length - 1), s.substr(-1.7));
53assertEquals(s.substring(s.length - 2), s.substr(-2));
54assertEquals(s.substring(s.length - 2), s.substr(-2.3));
55assertEquals(s.substring(s.length - 2, s.length - 1), s.substr(-2, 1));
56assertEquals(s, s.substr(-100));
57assertEquals('abc', s.substr(-100, 3));
58assertEquals(s1, s.substr(-s.length + 1));
59
60// assertEquals('', s.substr(0, void 0)); // smjs and rhino
61assertEquals('abcdefghijklmn', s.substr(0, void 0));  // kjs and v8
62assertEquals('', s.substr(0, null));
63assertEquals(s, s.substr(0, String(s.length)));
64assertEquals('a', s.substr(0, true));
65
66
67// Test substrings of different lengths and alignments.
68// First ASCII.
69var x = "ASCII";
70for (var i = 0; i < 25; i++) {
71  x += (i >> 4).toString(16) + (i & 0x0f).toString(16);
72}
73/x/.exec(x);  // Try to force a flatten.
74for (var i = 5; i < 25; i++) {
75  for (var j = 0; j < 25; j++) {
76    var z = x.substring(i, i+j);
77    var w = Math.random() * 42;  // Allocate something new in new-space.
78    assertEquals(j, z.length);
79    for (var k = 0; k < j; k++) {
80      assertEquals(x.charAt(i+k), z.charAt(k));
81    }
82  }
83}
84// Then two-byte strings.
85x = "UC16\u2028";  // Non-ascii char forces two-byte string.
86for (var i = 0; i < 25; i++) {
87  x += (i >> 4).toString(16) + (i & 0x0f).toString(16);
88}
89/x/.exec(x);  // Try to force a flatten.
90for (var i = 5; i < 25; i++) {
91  for (var j = 0; j < 25; j++) {
92    var z = x.substring(i, i + j);
93    var w = Math.random() * 42;  // Allocate something new in new-space.
94    assertEquals(j, z.length);
95    for (var k = 0; k < j; k++) {
96      assertEquals(x.charAt(i+k), z.charAt(k));
97    }
98  }
99}
100
101// Keep creating strings to to force allocation failure on substring creation.
102var x = "0123456789ABCDEF";
103x += x;  // 2^5
104x += x;
105x += x;
106x += x;
107x += x;
108x += x;  // 2^10
109x += x;
110x += x;
111var xl = x.length;
112var cache = [];
113for (var i = 0; i < 1000; i++) {
114  var z = x.substring(i % xl);
115  assertEquals(xl - (i % xl), z.length);
116  cache.push(z);
117}
118
119
120// Same with two-byte strings
121var x = "\u2028123456789ABCDEF";
122x += x;  // 2^5
123x += x;
124x += x;
125x += x;
126x += x;
127x += x;  // 2^10
128x += x;
129x += x;
130var xl = x.length;
131var cache = [];
132for (var i = 0; i < 1000; i++) {
133  var z = x.substring(i % xl);
134  assertEquals(xl - (i % xl), z.length);
135  cache.push(z);
136}
137
138// Substring of substring.
139var cache = [];
140var last = x;
141var offset = 0;
142for (var i = 0; i < 64; i++) {
143  var z = last.substring(i);
144  last = z;
145  cache.push(z);
146  offset += i;
147}
148for (var i = 63; i >= 0; i--) {
149  var z = cache.pop();
150  assertTrue(/\u2028123456789ABCDEF/.test(z));
151  assertEquals(xl - offset, z.length);
152  assertEquals(x.charAt(i*(i+1)/2), z.charAt(0));
153  offset -= i;
154}
155
156// Test charAt for different strings.
157function f(s1, s2, s3, i) {
158  assertEquals(String.fromCharCode(97+i%11), s1.charAt(i%11));
159  assertEquals(String.fromCharCode(97+i%11), s2.charAt(i%11));
160  assertEquals(String.fromCharCode(98+i%11), s3.charAt(i%11));
161  assertEquals(String.fromCharCode(101), s3.charAt(3));
162}
163
164flat = "abcdefghijkl12345";
165cons = flat + flat.toUpperCase();
166slice = "abcdefghijklmn12345".slice(1, -1);
167for ( var i = 0; i < 1000; i++) {
168  f(flat, cons, slice, i);
169}
170flat = "abcdefghijkl1\u20232345";
171cons = flat + flat.toUpperCase();
172slice = "abcdefghijklmn1\u20232345".slice(1, -1);
173for ( var i = 0; i < 1000; i++) {
174  f(flat, cons, slice, i);
175}
176
177// Concatenate substrings.
178var ascii = 'abcdefghijklmnop';
179var utf = '\u03B1\u03B2\u03B3\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9\u03BA\u03BB';
180assertEquals("klmno", ascii.substring(10,15) + ascii.substring(16));
181assertEquals("\u03B4\u03B7", utf.substring(3,4) + utf.substring(6,7));
182assertEquals("klp", ascii.substring(10,12) + ascii.substring(15,16));
183assertEquals("\u03B1\u03B4\u03B5", utf.substring(0,1) + utf.substring(5,3));
184assertEquals("", ascii.substring(16) + utf.substring(16));
185assertEquals("bcdef\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9",
186    ascii.substring(1,6) + utf.substring(3,9));
187assertEquals("\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9abcdefghijklmnop",
188    utf.substring(3,9) + ascii);
189assertEquals("\u03B2\u03B3\u03B4\u03B5\u03B4\u03B5\u03B6\u03B7",
190    utf.substring(5,1) + utf.substring(3,7));
191
192/*
193// Externalizing strings.
194var a = "123456789qwertyuiopasdfghjklzxcvbnm";
195var b = a.slice(1,-1);
196assertEquals(a.slice(1,-1), b);
197externalizeString(a);
198assertEquals(a.slice(1,-1), b);
199*/
200