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/*
* Licensed Materials - Property of IBM,
* WebSphere Studio Workbench
* (c) Copyright IBM Corp 2000, 2001
*/
package org.eclipse.compare.internal;
import org.eclipse.swt.SWTError;
import org.eclipse.jface.text.*;
import org.eclipse.compare.rangedifferencer.IRangeComparator;
import org.eclipse.compare.contentmergeviewer.ITokenComparator;
/**
* Implements the <code>ITokenComparator</code> interface for lines in a document.
* A <code>DocLineComparator</code> is used as the input for the <code>RangeDifferencer</code>
* engine to perform a line oriented compare on documents.
* <p>
* A <code>DocLineComparator</code> doesn't know anything about line separators because
* its notion of lines is solely defined in the underlying <code>IDocument</code>.
*/
public class DocLineComparator implements IRangeComparator {
private IDocument fDocument;
private int fLineOffset;
private int fLineCount;
private int fLength;
private boolean fIgnoreWhiteSpace;
/**
* Creates a <code>DocLineComparator</code> for the given document range.
* ignoreWhiteSpace controls whether comparing lines (in method
* <code>rangesEqual<code>) should ignore whitespace.
*
* @param document the document from which the lines are taken
* @param region if non-<code>null</code> only lines within this range are taken
* @param ignoreWhiteSpace if <code>true</code> white space is ignored when comparing lines
*/
public DocLineComparator(IDocument document, IRegion region, boolean ignoreWhiteSpace) {
fDocument= document;
fIgnoreWhiteSpace= ignoreWhiteSpace;
fLineOffset= 0;
if (region != null) {
fLength= region.getLength();
int start= region.getOffset();
try {
fLineOffset= fDocument.getLineOfOffset(start);
} catch (BadLocationException ex) {
}
if (fLength == 0)
fLineCount= 0;
else {
int endLine= fDocument.getNumberOfLines();
try {
endLine= fDocument.getLineOfOffset(start + fLength);
} catch (BadLocationException ex) {
}
fLineCount= endLine - fLineOffset + 1;
}
} else {
fLength= document.getLength();
fLineCount= fDocument.getNumberOfLines();
}
}
/**
* Returns the content of lines in the specified range as a String.
* This includes the line separators.
*
* @param start index of first line
* @param length number of lines
* @return the contents of the specified line range as a String
*/
public String extract(int start, int length) {
if (fLength > 0) {
if (fLength == 1)
return extract(start);
int startPos= getTokenStart(start);
int endPos= getTokenStart(start + length);
try {
return fDocument.get(startPos, endPos - startPos);
} catch (BadLocationException e) {
System.out.println("extract("+fDocument.getLength()+"): " + startPos + " " + endPos);
}
}
return "";
}
/**
* Extract a single line from the underlying document without the line separator.
*
* @param line the number of the line to extract
* @return the contents of the line as a String
*/
public String extract(int line) {
line += fLineOffset;
if (line < fLength) {
try {
IRegion r= fDocument.getLineInformation(line);
return fDocument.get(r.getOffset(), r.getLength());
// return fDocument.getLine(line);
} catch(BadLocationException e) {
}
}
return "";
}
/**
* Returns the number of lines in the document.
*
* @return number of lines
*/
public int getRangeCount() {
return fLineCount;
}
/**
* Returns <code>true</code> if a line given by the first index
* matches a line specified by the other <code>IRangeComparator</code> and index.
*
* @param thisIndex the number of the line within this range comparator
* @param other the range comparator to compare this with
* @param otherIndex the number of the line within the other comparator
* @return <code>true</code> if the lines are equal
*/
public boolean rangesEqual(int thisIndex, IRangeComparator other0, int otherIndex) {
if (other0 != null && other0.getClass() == getClass()) {
DocLineComparator other= (DocLineComparator) other0;
if (fIgnoreWhiteSpace) {
String s1= extract(thisIndex);
String s2= other.extract(otherIndex);
return compare(s1, s2);
}
int tlen= getTokenLength(thisIndex);
int olen= other.getTokenLength(otherIndex);
if (tlen == olen) {
String s1= extract(thisIndex);
String s2= other.extract(otherIndex);
return s1.equals(s2);
}
}
return false;
}
/* (non Javadoc)
* see IRangeComparator.skipRangeComparison
*/
public boolean skipRangeComparison(int length, int max, IRangeComparator other) {
return false;
}
/* (non Javadoc)
* see ITokenComparator.getTokenStart
*/
public int getTokenStart(int line) {
try {
IRegion r= fDocument.getLineInformation(fLineOffset + line);
return r.getOffset();
//return fDocument.getLineStartOffset(fLineOffset + line);
} catch (BadLocationException ex) {
return fDocument.getLength();
}
}
/* (non Javadoc)
* see ITokenComparator.getTokenEnd
*/
public int getTokenEnd(int start, int length) {
return getTokenStart(start + length);
}
//---- private methods
private int getTokenLength(int line) {
if (fLength == 0)
return 0;
return getTokenStart(line + 1) - getTokenStart(line);
}
private boolean compare(String s1, String s2) {
int i1= 0;
int i2= 0;
int l1= s1.length();
int l2= s2.length();
char c1= ' ';
char c2= ' ';
while (i1 < l1 || i2 < l2) {
if (i1 < l1) {
c1= s1.charAt(i1);
if (Character.isWhitespace(c1)) {
i1++;
continue;
}
}
if (i2 < l2) {
c2= s2.charAt(i2);
if (Character.isWhitespace(c2)) {
i2++;
continue;
}
}
if (c1 != c2)
return false;
i1++;
i2++;
}
return true;
}
}
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