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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ 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;
}
//########################################################################
}
|
