source: trip-planner-front/node_modules/esutils/lib/keyword.js@ 76712b2

Last change on this file since 76712b2 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/*
2 Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are met:
6
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in the
11 documentation and/or other materials provided with the distribution.
12
13 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
14 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
17 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
20 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23*/
24
25(function () {
26 'use strict';
27
28 var code = require('./code');
29
30 function isStrictModeReservedWordES6(id) {
31 switch (id) {
32 case 'implements':
33 case 'interface':
34 case 'package':
35 case 'private':
36 case 'protected':
37 case 'public':
38 case 'static':
39 case 'let':
40 return true;
41 default:
42 return false;
43 }
44 }
45
46 function isKeywordES5(id, strict) {
47 // yield should not be treated as keyword under non-strict mode.
48 if (!strict && id === 'yield') {
49 return false;
50 }
51 return isKeywordES6(id, strict);
52 }
53
54 function isKeywordES6(id, strict) {
55 if (strict && isStrictModeReservedWordES6(id)) {
56 return true;
57 }
58
59 switch (id.length) {
60 case 2:
61 return (id === 'if') || (id === 'in') || (id === 'do');
62 case 3:
63 return (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try');
64 case 4:
65 return (id === 'this') || (id === 'else') || (id === 'case') ||
66 (id === 'void') || (id === 'with') || (id === 'enum');
67 case 5:
68 return (id === 'while') || (id === 'break') || (id === 'catch') ||
69 (id === 'throw') || (id === 'const') || (id === 'yield') ||
70 (id === 'class') || (id === 'super');
71 case 6:
72 return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
73 (id === 'switch') || (id === 'export') || (id === 'import');
74 case 7:
75 return (id === 'default') || (id === 'finally') || (id === 'extends');
76 case 8:
77 return (id === 'function') || (id === 'continue') || (id === 'debugger');
78 case 10:
79 return (id === 'instanceof');
80 default:
81 return false;
82 }
83 }
84
85 function isReservedWordES5(id, strict) {
86 return id === 'null' || id === 'true' || id === 'false' || isKeywordES5(id, strict);
87 }
88
89 function isReservedWordES6(id, strict) {
90 return id === 'null' || id === 'true' || id === 'false' || isKeywordES6(id, strict);
91 }
92
93 function isRestrictedWord(id) {
94 return id === 'eval' || id === 'arguments';
95 }
96
97 function isIdentifierNameES5(id) {
98 var i, iz, ch;
99
100 if (id.length === 0) { return false; }
101
102 ch = id.charCodeAt(0);
103 if (!code.isIdentifierStartES5(ch)) {
104 return false;
105 }
106
107 for (i = 1, iz = id.length; i < iz; ++i) {
108 ch = id.charCodeAt(i);
109 if (!code.isIdentifierPartES5(ch)) {
110 return false;
111 }
112 }
113 return true;
114 }
115
116 function decodeUtf16(lead, trail) {
117 return (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
118 }
119
120 function isIdentifierNameES6(id) {
121 var i, iz, ch, lowCh, check;
122
123 if (id.length === 0) { return false; }
124
125 check = code.isIdentifierStartES6;
126 for (i = 0, iz = id.length; i < iz; ++i) {
127 ch = id.charCodeAt(i);
128 if (0xD800 <= ch && ch <= 0xDBFF) {
129 ++i;
130 if (i >= iz) { return false; }
131 lowCh = id.charCodeAt(i);
132 if (!(0xDC00 <= lowCh && lowCh <= 0xDFFF)) {
133 return false;
134 }
135 ch = decodeUtf16(ch, lowCh);
136 }
137 if (!check(ch)) {
138 return false;
139 }
140 check = code.isIdentifierPartES6;
141 }
142 return true;
143 }
144
145 function isIdentifierES5(id, strict) {
146 return isIdentifierNameES5(id) && !isReservedWordES5(id, strict);
147 }
148
149 function isIdentifierES6(id, strict) {
150 return isIdentifierNameES6(id) && !isReservedWordES6(id, strict);
151 }
152
153 module.exports = {
154 isKeywordES5: isKeywordES5,
155 isKeywordES6: isKeywordES6,
156 isReservedWordES5: isReservedWordES5,
157 isReservedWordES6: isReservedWordES6,
158 isRestrictedWord: isRestrictedWord,
159 isIdentifierNameES5: isIdentifierNameES5,
160 isIdentifierNameES6: isIdentifierNameES6,
161 isIdentifierES5: isIdentifierES5,
162 isIdentifierES6: isIdentifierES6
163 };
164}());
165/* vim: set sw=4 ts=4 et tw=80 : */
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