-
Notifications
You must be signed in to change notification settings - Fork 1.1k
/
TokenStream.java
195 lines (192 loc) · 8.29 KB
/
TokenStream.java
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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger Lawrence
* Mike McCabe
* Igor Bukanov
* Ethan Hugg
* Bob Jervis
* Terry Lucas
* Milen Nankov
* Pascal-Louis Perez
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package com.google.javascript.rhino;
/**
* This class implements the JavaScript scanner.
*
* It is based on the C source files jsscan.c and jsscan.h
* in the jsref package.
*
*
* IMPORTANT: As of 2018-03-09 it is still not possible to use Java 8 features in this file
* due to limitations on some internal Google projects that depend on it.
*/
public class TokenStream {
public static boolean isKeyword(String name) {
boolean id = false;
String s = name;
complete: {
String X = null;
int c;
partial: switch (s.length()) {
case 2: c=s.charAt(1);
if (c=='f') {
if (s.charAt(0)=='i') {id=true; break complete;}
} else if (c=='n') {
if (s.charAt(0)=='i') {id=true; break complete;}
} else if (c=='o') {
if (s.charAt(0)=='d') {id=true; break complete;}
}
break partial;
case 3: switch (s.charAt(0)) {
case 'f':
if (s.charAt(2)=='r' && s.charAt(1)=='o') {
id=true; break complete;
} break partial;
case 'i':
if (s.charAt(2)=='t' && s.charAt(1)=='n') {
id=true; break complete;
} break partial;
case 'n':
if (s.charAt(2)=='w' && s.charAt(1)=='e') {
id=true; break complete;
} break partial;
case 't':
if (s.charAt(2)=='y' && s.charAt(1)=='r') {
id=true; break complete;
} break partial;
case 'v':
if (s.charAt(2)=='r' && s.charAt(1)=='a') {
id=true; break complete;
} break partial;
} break partial;
case 4: switch (s.charAt(0)) {
case 'b': X="byte";id=true; break partial;
case 'c': c=s.charAt(3);
if (c=='e') { if (s.charAt(2)=='s' && s.charAt(1)=='a') {
id=true; break complete;} }
else if (c=='r') {
if (s.charAt(2)=='a' && s.charAt(1)=='h') {
id=true; break complete;
}
}
break partial;
case 'e': c=s.charAt(3);
if (c=='e') { if (s.charAt(2)=='s' && s.charAt(1)=='l') {
id=true; break complete;} }
else if (c=='m') {
if (s.charAt(2)=='u' && s.charAt(1)=='n') {
id=true; break complete;} }
break partial;
case 'g': X="goto";id=true; break partial;
case 'l': X="long";id=true; break partial;
case 'n': X="null";id=true; break partial;
case 't': c=s.charAt(3);
if (c=='e') { if (s.charAt(2)=='u' && s.charAt(1)=='r') {
id=true; break complete;} }
else if (c=='s') {
if (s.charAt(2)=='i' && s.charAt(1)=='h') {
id=true; break complete;} }
break partial;
case 'v': X="void";id=true; break partial;
case 'w': X="with";id=true; break partial;
} break partial;
case 5: switch (s.charAt(2)) {
case 'a': X="class";id=true; break partial;
case 'e': X="break";id=true; break partial;
case 'i': X="while";id=true; break partial;
case 'l': X="false";id=true; break partial;
case 'n': c=s.charAt(0);
if (c=='c') { X="const";id=true; }
else if (c=='f') { X="final";id=true; }
break partial;
case 'o': c=s.charAt(0);
if (c=='f') { X="float";id=true; }
else if (c=='s') { X="short";id=true; }
break partial;
case 'p': X="super";id=true; break partial;
case 'r': X="throw";id=true; break partial;
case 't': X="catch";id=true; break partial;
} break partial;
case 6: switch (s.charAt(1)) {
case 'a': X="native";id=true; break partial;
case 'e': c=s.charAt(0);
if (c=='d') { X="delete";id=true; }
else if (c=='r') { X="return";id=true; }
break partial;
case 'h': X="throws";id=true; break partial;
case 'm': X="import";id=true; break partial;
case 'o': X="double";id=true; break partial;
case 't': X="static";id=true; break partial;
case 'u': X="public";id=true; break partial;
case 'w': X="switch";id=true; break partial;
case 'x': X="export";id=true; break partial;
case 'y': X="typeof";id=true; break partial;
} break partial;
case 7: switch (s.charAt(1)) {
case 'a': X="package";id=true; break partial;
case 'e': X="default";id=true; break partial;
case 'i': X="finally";id=true; break partial;
case 'o': X="boolean";id=true; break partial;
case 'r': X="private";id=true; break partial;
case 'x': X="extends";id=true; break partial;
} break partial;
case 8: switch (s.charAt(0)) {
case 'a': X="abstract";id=true; break partial;
case 'c': X="continue";id=true; break partial;
case 'd': X="debugger";id=true; break partial;
case 'f': X="function";id=true; break partial;
case 'v': X="volatile";id=true; break partial;
} break partial;
case 9: c=s.charAt(0);
if (c=='i') { X="interface";id=true; }
else if (c=='p') { X="protected";id=true; }
else if (c=='t') { X="transient";id=true; }
break partial;
case 10: c=s.charAt(1);
if (c=='m') { X="implements";id=true; }
else if (c=='n') { X="instanceof";id=true; }
break partial;
case 12: X="synchronized";id=true; break partial;
}
// partial match validate the entire string the one possibility
if (X!=null && X!=s && !X.equals(s)) return false;
}
return id;
}
public static boolean isJSIdentifier(String s) {
return JSIdentifier.isJSIdentifier(s);
}
}