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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scala.tools.util;
/** This class represents a single source file. */
public class SourceFile {
//########################################################################
// 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 underlying file */
private final AbstractFile file;
/** The content of this source file */
private final char[] content;
/** 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 this instance with given name and content. */
public SourceFile(String sourcename, char[] content) {
this(new CharArrayFile(sourcename, content), content);
}
/** Initializes this instance with given file and content. */
public SourceFile(AbstractFile file, char[] content) {
this.file = file;
this.content = normalize(content);
}
//########################################################################
// Public Methods
/** Returns the underlying file. */
public AbstractFile getFile() {
return file;
}
/** Returns the content of this source file. */
public char[] getContent() {
return content;
}
/**
* 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 specified line. */
public String getLine(int line) {
int index = lineNumber <= line ? nextIndex : (lineNumber = 0);
for (; index < content.length && lineNumber < line; lineNumber++) {
lineStart = index;
for (; index < content.length; index++) {
if (content[index] == CR) break;
if (content[index] == LF) break;
if (content[index] == FF) break;
}
lineLength = index - lineStart;
if (index < content.length)
index++;
if (index < content.length)
if (content[index - 1] == CR && content[index] == LF) index++;
}
nextIndex = index;
return new String(content, lineStart, lineLength);
}
/** Returns the path of the underlying file. */
public String toString() {
return file.toString();
}
public int hashCode() {
return file.hashCode();
}
public boolean equals(Object that) {
return that instanceof SourceFile &&
file.equals(((SourceFile) that).file);
}
//########################################################################
// Private Functions
/** Ensures that the last char of the array is SU. */
private static char[] normalize(char[] input) {
if (input.length > 0 && input[input.length - 1] == SU)
return input;
char[] content = new char[input.length + 1];
System.arraycopy(input, 0, content, 0, input.length);
content[input.length] = SU;
return content;
}
//########################################################################
}
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