string-charcodeat.js revision d0582a6c46733687d045e4188a1bcd0123c758a1 
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27
28/**
29 * @fileoverview Check all sorts of borderline cases for charCodeAt.
30 */
31
32function Cons() {
33  return "Te" + "st testing 123";
34}
35
36
37function Deep() {
38  var a = "T";
39  a += "e";
40  a += "s";
41  a += "ting testing 123";
42  return a;
43}
44
45
46function Slice() {
47  return "testing Testing testing 123456789012345".substring(8, 22);
48}
49
50
51function Flat() {
52  return "Testing testing 123";
53}
54
55function Cons16() {
56  return "Te" + "\u1234t testing 123";
57}
58
59
60function Deep16() {
61  var a = "T";
62  a += "e";
63  a += "\u1234";
64  a += "ting testing 123";
65  return a;
66}
67
68
69function Slice16Beginning() {
70  return "Te\u1234t testing testing 123".substring(0, 14);
71}
72
73
74function Slice16Middle() {
75  return "test Te\u1234t testing testing 123".substring(5, 19);
76}
77
78
79function Slice16End() {
80  return "test Te\u1234t".substring(5, 9);
81}
82
83
84function Flat16() {
85  return "Te\u1234ting testing 123";
86}
87
88
89function Thing() {
90}
91
92
93function NotAString() {
94  var n = new Thing();
95  n.toString = function() { return "Test"; };
96  n.charCodeAt = String.prototype.charCodeAt;
97  return n;
98}
99
100
101function NotAString16() {
102  var n = new Thing();
103  n.toString = function() { return "Te\u1234t"; };
104  n.charCodeAt = String.prototype.charCodeAt;
105  return n;
106}
107
108
109function TestStringType(generator, sixteen) {
110  var g = generator;
111  var len = g().toString().length;
112  var t = sixteen ? "t" : "f"
113  t += generator.name;
114  assertTrue(isNaN(g().charCodeAt(-1e19)), 1 + t);
115  assertTrue(isNaN(g().charCodeAt(-0x80000001)), 2 + t);
116  assertTrue(isNaN(g().charCodeAt(-0x80000000)), 3 + t);
117  assertTrue(isNaN(g().charCodeAt(-0x40000000)), 4 + t);
118  assertTrue(isNaN(g().charCodeAt(-1)), 5 + t);
119  assertTrue(isNaN(g().charCodeAt(len)), 6 + t);
120  assertTrue(isNaN(g().charCodeAt(len + 1)), 7 + t);
121  assertTrue(isNaN(g().charCodeAt(0x3fffffff)), 8 + t);
122  assertTrue(isNaN(g().charCodeAt(0x7fffffff)), 9 + t);
123  assertTrue(isNaN(g().charCodeAt(0x80000000)), 10 + t);
124  assertTrue(isNaN(g().charCodeAt(1e9)), 11 + t);
125  assertEquals(84, g().charCodeAt(0), 12 + t);
126  assertEquals(84, g().charCodeAt("test"), 13 + t);
127  assertEquals(84, g().charCodeAt(""), 14 + t);
128  assertEquals(84, g().charCodeAt(null), 15 + t);
129  assertEquals(84, g().charCodeAt(undefined), 16 + t);
130  assertEquals(84, g().charCodeAt(), 17 + t);
131  assertEquals(84, g().charCodeAt(void 0), 18 + t);
132  assertEquals(84, g().charCodeAt(false), 19 + t);
133  assertEquals(101, g().charCodeAt(true), 20 + t);
134  assertEquals(101, g().charCodeAt(1), 21 + t);
135  assertEquals(sixteen ? 0x1234 : 115, g().charCodeAt(2), 22 + t);
136  assertEquals(116, g().charCodeAt(3), 23 + t);
137  assertEquals(101, g().charCodeAt(1.1), 24 + t);
138  assertEquals(sixteen ? 0x1234 : 115, g().charCodeAt(2.1718), 25 + t);
139  assertEquals(116, g().charCodeAt(3.14159), 26 + t);
140}
141
142
143TestStringType(Cons, false);
144TestStringType(Deep, false);
145TestStringType(Slice, false);
146TestStringType(Flat, false);
147TestStringType(NotAString, false);
148TestStringType(Cons16, true);
149TestStringType(Deep16, true);
150TestStringType(Slice16Beginning, true);
151TestStringType(Slice16Middle, true);
152TestStringType(Slice16End, true);
153TestStringType(Flat16, true);
154TestStringType(NotAString16, true);
155
156
157function StupidThing() {
158  // Doesn't return a string from toString!
159  this.toString = function() { return 42; }
160  this.charCodeAt = String.prototype.charCodeAt;
161}
162
163assertEquals(52, new StupidThing().charCodeAt(0), 27);
164assertEquals(50, new StupidThing().charCodeAt(1), 28);
165assertTrue(isNaN(new StupidThing().charCodeAt(2)), 29);
166assertTrue(isNaN(new StupidThing().charCodeAt(-1)), 30);
167
168
169// Medium (>255) and long (>65535) strings.
170
171var medium = "12345678";
172medium += medium; // 16.
173medium += medium; // 32.
174medium += medium; // 64.
175medium += medium; // 128.
176medium += medium; // 256.
177
178var long = medium;
179long += long + long + long;     // 1024.
180long += long + long + long;     // 4096.
181long += long + long + long;     // 16384.
182long += long + long + long;     // 65536.
183
184assertTrue(isNaN(medium.charCodeAt(-1)), 31);
185assertEquals(49, medium.charCodeAt(0), 32);
186assertEquals(56, medium.charCodeAt(255), 33);
187assertTrue(isNaN(medium.charCodeAt(256)), 34);
188
189assertTrue(isNaN(long.charCodeAt(-1)), 35);
190assertEquals(49, long.charCodeAt(0), 36);
191assertEquals(56, long.charCodeAt(65535), 37);
192assertTrue(isNaN(long.charCodeAt(65536)), 38);
193