/
Symbol.java
167 lines (149 loc) · 4.49 KB
/
Symbol.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
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** 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):
* Norris Boyd
* Roger Lawrence
* Mike McCabe
* Steve Yegge
*
* 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 org.mozilla.javascript.ast;
import org.mozilla.javascript.Node;
import org.mozilla.javascript.Token;
/**
* Represents a symbol-table entry.
*/
public class Symbol {
// One of Token.FUNCTION, Token.LP (for parameters), Token.VAR,
// Token.LET, or Token.CONST
private int declType;
private int index = -1;
private String name;
private Node node;
private Scope containingTable;
public Symbol() {
}
/**
* Constructs a new Symbol with a specific name and declaration type
* @param declType {@link Token#FUNCTION}, {@link Token#LP}
* (for params), {@link Token#VAR}, {@link Token#LET} or {@link Token#CONST}
*/
public Symbol(int declType, String name) {
setName(name);
setDeclType(declType);
}
/**
* Returns symbol declaration type
*/
public int getDeclType() {
return declType;
}
/**
* Sets symbol declaration type
*/
public void setDeclType(int declType) {
if (!(declType == Token.FUNCTION
|| declType == Token.FUNCTION_UNARY
|| declType == Token.LP
|| declType == Token.VAR
|| declType == Token.LET
|| declType == Token.CONST))
throw new IllegalArgumentException("Invalid declType: " + declType);
this.declType = declType;
}
/**
* Returns symbol name
*/
public String getName() {
return name;
}
/**
* Sets symbol name
*/
public void setName(String name) {
this.name = name;
}
/**
* Returns the node associated with this identifier
*/
public Node getNode() {
return node;
}
/**
* Returns symbol's index in its scope
*/
public int getIndex() {
return index;
}
/**
* Sets symbol's index in its scope
*/
public void setIndex(int index) {
this.index = index;
}
/**
* Sets the node associated with this identifier
*/
public void setNode(Node node) {
this.node = node;
}
/**
* Returns the Scope in which this symbol is entered
*/
public Scope getContainingTable() {
return containingTable;
}
/**
* Sets this symbol's Scope
*/
public void setContainingTable(Scope containingTable) {
this.containingTable = containingTable;
}
public String getDeclTypeName() {
return Token.typeToName(declType);
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
result.append("Symbol (");
result.append(getDeclTypeName());
result.append(") name=");
result.append(name);
if (node != null) {
result.append(" line=");
result.append(node.getLineno());
}
return result.toString();
}
}