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
|
/*
* Anarres C Preprocessor
* Copyright (C) 2007 Shevek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.anarres.cpp;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import static org.anarres.cpp.Token.*;
/**
* A Reader wrapper around the Preprocessor.
*
* This is a utility class to provide a transparent {@link Reader}
* which preprocesses the input text.
*
* @see Preprocessor
* @see Reader
*/
public class CppReader extends Reader {
private Preprocessor cpp;
private String token;
private int idx;
public CppReader(final Reader r) {
cpp = new Preprocessor(new LexerSource(r, true) {
@Override
public String getName() {
return "<CppReader Input@" +
System.identityHashCode(r) + ">";
}
});
token = "";
idx = 0;
}
public CppReader(Preprocessor p) {
cpp = p;
token = "";
idx = 0;
}
/**
* Returns the Preprocessor used by this CppReader.
*/
public Preprocessor getPreprocessor() {
return cpp;
}
/**
* Defines the given name as a macro.
*
* This is a convnience method.
*/
public void addMacro(String name)
throws LexerException {
cpp.addMacro(name);
}
/**
* Defines the given name as a macro.
*
* This is a convnience method.
*/
public void addMacro(String name, String value)
throws LexerException {
cpp.addMacro(name, value);
}
private boolean refill()
throws IOException {
try {
assert cpp != null : "cpp is null : was it closed?";
if (token == null)
return false;
while (idx >= token.length()) {
Token tok = cpp.token();
switch (tok.getType()) {
case EOF:
token = null;
return false;
case COMMENT:
if (false) {
token = " ";
break;
}
default:
token = tok.getText();
break;
}
idx = 0;
}
return true;
}
catch (LexerException e) {
IOException ie = new IOException(String.valueOf(e));
ie.initCause(e);
throw ie;
}
}
public int read()
throws IOException {
if (!refill())
return -1;
return token.charAt(idx++);
}
/* XXX Very slow and inefficient. */
public int read(char cbuf[], int off, int len)
throws IOException {
if (token == null)
return -1;
for (int i = 0; i < len; i++) {
int ch = read();
if (ch == -1)
return i;
cbuf[off + i] = (char)ch;
}
return len;
}
public void close()
throws IOException {
cpp = null;
token = null;
}
}
|
