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
|
/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id$
\* */
package ch.epfl.lamp.util;
import java.io.File;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
/** This class represents a single source file.
*/
public class SourceFile2 implements AbstractSourceFile {
//########################################################################
// Public Constants
/** Constants used for source parsing */
public static final char LF = 0x0A;
public static final char FF = 0x0C;
public static final char CR = 0x0D;
public static final char SU = 0x1A;
//########################################################################
// Private Fields
/** The name of this source file */
private final String name;
/** The content of source this file */
private final char[] chars;
/** The encoding of this source file or null if unspecified */
private String encoding = "ISO-8859-1";
/** The position of the last line returned by getLine */
private int lineNumber = 0;
private int lineStart = 0;
private int lineLength = 0;
private int nextIndex = 0;
//########################################################################
// Public Constructors
/** Initializes a new instance. */
public SourceFile2(String name, String encoding)
throws IOException {
this(new File(name), encoding);
}
/** Initializes a new instance. */
public SourceFile2(File name, String encoding)
throws IOException {
this(name.toString(), read(name, encoding));
}
/** Initializes a new instance. */
public SourceFile2(String name, InputStream input, String encoding)
throws IOException {
this(name, read(name, input, encoding));
}
/** Initializes a new instance. */
public SourceFile2(String name, char[] inp) {
this.name = name;
this.chars = normalize( inp );
}
//########################################################################
// Public Methods
/** Returns the name of this source file. */
public String name() {
return name;
}
/** Returns the content of this source file. */
public char[] chars() {
return chars;
}
/** Returns the short name (name without path) of this source file. */
public String getShortName() {
int start = name.lastIndexOf( File.separatorChar );
return start < 0 ? name : name.substring( start + 1 );
}
/**
* Returns an instance of Position representing the given line and
* column of this source file.
*/
public Position getPosition( int line, int column ) {
return new Position( this, line, column );
}
/** Returns the content of the given line. */
public String getLine(int line) {
int index = lineNumber <= line ? nextIndex : (lineNumber = 0);
for (; index < chars.length && lineNumber < line; lineNumber++) {
lineStart = index;
for (; index < chars.length; index++) {
if (chars[ index ] == CR) break;
if (chars[ index ] == LF) break;
if (chars[ index ] == FF) break;
}
lineLength = index - lineStart;
if (index < chars.length)
index++;
if (index < chars.length)
if (chars[index - 1] == CR && chars[index] == LF) index++;
}
nextIndex = index;
return new String(chars, lineStart, lineLength);
}
/** Returns the name of this source file. */
public String toString() {
return name;
}
//########################################################################
// Private Methods
/** Reads the file and returns its content as a byte array.
*/
private static char[] read(File file, String encoding) throws IOException {
FileInputStream input = new FileInputStream( file );
try {
return read( input, encoding );
} finally {
input.close();
}
}
private static char[] read(ByteBuffer bb, String encoding)
throws IOException {
try {
CharsetDecoder chd = Charset.forName( encoding ).newDecoder();
CharBuffer cb = chd.decode( bb );
if( cb.hasArray() )
return cb.array();
else {
char[] cs = new char[ cb.length() ];
for(int i = 0; cb.hasRemaining(); i++ ) {
cs[i] = cb.get();
}
return cs;
}
} catch (CharacterCodingException e) {
throw new IOException("error in decoding:"+e.getMessage());
}
}
private static char[] read(FileInputStream input, String encoding)
throws IOException {
return read( input
.getChannel()
.map( FileChannel.MapMode.READ_ONLY, 0, input.available()),
encoding );
}
/** Reads the InputStream and returns its content as a byte array.
*/
private static char[] read(String name, InputStream input, String encoding) throws IOException {
ByteBuffer bb = ByteBuffer.allocate( input.available() );
Channels.newChannel( input ).read( bb );
return read( bb, encoding );
}
/** Ensures that the last byte of the array is SU. */
private static char[] normalize( char[] input ) {
if ( input.length > 0 && input[ input.length - 1 ] == SU )
return input;
char[] cs = new char[ input.length + 1 ];
System.arraycopy( input, 0, cs, 0, input.length );
cs[ input.length ] = SU;
return cs;
}
//########################################################################
}
|