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
|
/*
[The "BSD license"]
Copyright (c) 2005-2009 Terence Parr
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. 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.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*/
package org.antlr.runtime.debug;
import org.antlr.runtime.*;
import java.util.List;
public class DebugTokenStream implements TokenStream {
protected DebugEventListener dbg;
public TokenStream input;
protected boolean initialStreamState = true;
/** Track the last mark() call result value for use in rewind(). */
protected int lastMarker;
public DebugTokenStream(TokenStream input, DebugEventListener dbg) {
this.input = input;
setDebugListener(dbg);
// force TokenStream to get at least first valid token
// so we know if there are any hidden tokens first in the stream
input.LT(1);
}
public void setDebugListener(DebugEventListener dbg) {
this.dbg = dbg;
}
public void consume() {
if ( initialStreamState ) {
consumeInitialHiddenTokens();
}
int a = input.index();
Token t = input.LT(1);
input.consume();
int b = input.index();
dbg.consumeToken(t);
if ( b>a+1 ) {
// then we consumed more than one token; must be off channel tokens
for (int i=a+1; i<b; i++) {
dbg.consumeHiddenToken(input.get(i));
}
}
}
/* consume all initial off-channel tokens */
protected void consumeInitialHiddenTokens() {
int firstOnChannelTokenIndex = input.index();
for (int i=0; i<firstOnChannelTokenIndex; i++) {
dbg.consumeHiddenToken(input.get(i));
}
initialStreamState = false;
}
public Token LT(int i) {
if ( initialStreamState ) {
consumeInitialHiddenTokens();
}
dbg.LT(i, input.LT(i));
return input.LT(i);
}
public int LA(int i) {
if ( initialStreamState ) {
consumeInitialHiddenTokens();
}
dbg.LT(i, input.LT(i));
return input.LA(i);
}
public Token get(int i) {
return input.get(i);
}
public int mark() {
lastMarker = input.mark();
dbg.mark(lastMarker);
return lastMarker;
}
public int index() {
return input.index();
}
public int range() {
return input.range();
}
public void rewind(int marker) {
dbg.rewind(marker);
input.rewind(marker);
}
public void rewind() {
dbg.rewind();
input.rewind(lastMarker);
}
public void release(int marker) {
}
public void seek(int index) {
// TODO: implement seek in dbg interface
// db.seek(index);
input.seek(index);
}
public int size() {
return input.size();
}
public TokenSource getTokenSource() {
return input.getTokenSource();
}
public String getSourceName() {
return getTokenSource().getSourceName();
}
public String toString() {
return input.toString();
}
public String toString(int start, int stop) {
return input.toString(start,stop);
}
public String toString(Token start, Token stop) {
return input.toString(start,stop);
}
}
|
