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
|
/*
Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
(function () {
'use strict';
var code = require('./code');
function isStrictModeReservedWordES6(id) {
switch (id) {
case 'implements':
case 'interface':
case 'package':
case 'private':
case 'protected':
case 'public':
case 'static':
case 'let':
return true;
default:
return false;
}
}
function isKeywordES5(id, strict) {
// yield should not be treated as keyword under non-strict mode.
if (!strict && id === 'yield') {
return false;
}
return isKeywordES6(id, strict);
}
function isKeywordES6(id, strict) {
if (strict && isStrictModeReservedWordES6(id)) {
return true;
}
switch (id.length) {
case 2:
return (id === 'if') || (id === 'in') || (id === 'do');
case 3:
return (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try');
case 4:
return (id === 'this') || (id === 'else') || (id === 'case') ||
(id === 'void') || (id === 'with') || (id === 'enum');
case 5:
return (id === 'while') || (id === 'break') || (id === 'catch') ||
(id === 'throw') || (id === 'const') || (id === 'yield') ||
(id === 'class') || (id === 'super');
case 6:
return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
(id === 'switch') || (id === 'export') || (id === 'import');
case 7:
return (id === 'default') || (id === 'finally') || (id === 'extends');
case 8:
return (id === 'function') || (id === 'continue') || (id === 'debugger');
case 10:
return (id === 'instanceof');
default:
return false;
}
}
function isReservedWordES5(id, strict) {
return id === 'null' || id === 'true' || id === 'false' || isKeywordES5(id, strict);
}
function isReservedWordES6(id, strict) {
return id === 'null' || id === 'true' || id === 'false' || isKeywordES6(id, strict);
}
function isRestrictedWord(id) {
return id === 'eval' || id === 'arguments';
}
function isIdentifierNameES5(id) {
var i, iz, ch;
if (id.length === 0) { return false; }
ch = id.charCodeAt(0);
if (!code.isIdentifierStartES5(ch)) {
return false;
}
for (i = 1, iz = id.length; i < iz; ++i) {
ch = id.charCodeAt(i);
if (!code.isIdentifierPartES5(ch)) {
return false;
}
}
return true;
}
function decodeUtf16(lead, trail) {
return (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
}
function isIdentifierNameES6(id) {
var i, iz, ch, lowCh, check;
if (id.length === 0) { return false; }
check = code.isIdentifierStartES6;
for (i = 0, iz = id.length; i < iz; ++i) {
ch = id.charCodeAt(i);
if (0xD800 <= ch && ch <= 0xDBFF) {
++i;
if (i >= iz) { return false; }
lowCh = id.charCodeAt(i);
if (!(0xDC00 <= lowCh && lowCh <= 0xDFFF)) {
return false;
}
ch = decodeUtf16(ch, lowCh);
}
if (!check(ch)) {
return false;
}
check = code.isIdentifierPartES6;
}
return true;
}
function isIdentifierES5(id, strict) {
return isIdentifierNameES5(id) && !isReservedWordES5(id, strict);
}
function isIdentifierES6(id, strict) {
return isIdentifierNameES6(id) && !isReservedWordES6(id, strict);
}
module.exports = {
isKeywordES5: isKeywordES5,
isKeywordES6: isKeywordES6,
isReservedWordES5: isReservedWordES5,
isReservedWordES6: isReservedWordES6,
isRestrictedWord: isRestrictedWord,
isIdentifierNameES5: isIdentifierNameES5,
isIdentifierNameES6: isIdentifierNameES6,
isIdentifierES5: isIdentifierES5,
isIdentifierES6: isIdentifierES6
};
}());
/* vim: set sw=4 ts=4 et tw=80 : */
|
