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/*******************************************************************************
* Copyright (c) 2006, 2012 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Christian Plesner Hansen ([email protected]) - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.source;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentExtension3;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextUtilities;
/**
* A character pair matcher that matches a specified set of character
* pairs against each other. Only characters that occur in the same
* partitioning are matched.
*
* @since 3.3
*/
public class DefaultCharacterPairMatcher implements ICharacterPairMatcher, ICharacterPairMatcherExtension {
private int fAnchor= -1;
private final CharPairs fPairs;
private final String fPartitioning;
private final boolean fCaretEitherSideOfBracket;
/**
* Creates a new character pair matcher that matches the specified characters within the
* specified partitioning. The specified list of characters must have the form {
* start, end, start, end, ..., start, end
* }
For instance:
*
*
* char[] chars = new char[] {'(', ')', '{', '}', '[', ']'};
* new DefaultCharacterPairMatcher(chars, ...);
*
*
* @param chars a list of characters
* @param partitioning the partitioning to match within
*/
public DefaultCharacterPairMatcher(char[] chars, String partitioning) {
this(chars, partitioning, false);
}
/**
* Creates a new character pair matcher that matches the specified characters within the
* specified partitioning. The specified list of characters must have the form {
* start, end, start, end, ..., start, end
* }
For instance:
*
*
* char[] chars = new char[] {'(', ')', '{', '}', '[', ']'};
* new DefaultCharacterPairMatcher(chars, ...);
*
*
* @param chars a list of characters
* @param partitioning the partitioning to match within
* @param caretEitherSideOfBracket controls the matching behavior. When true, the
* matching peer will be found when the caret is placed either before or after a
* character. When false, the matching peer will be found only when the
* caret is placed after a character.
* @since 3.8
*/
public DefaultCharacterPairMatcher(char[] chars, String partitioning, boolean caretEitherSideOfBracket) {
Assert.isLegal(chars.length % 2 == 0);
Assert.isNotNull(partitioning);
fPairs= new CharPairs(chars);
fPartitioning= partitioning;
fCaretEitherSideOfBracket= caretEitherSideOfBracket;
}
/**
* Creates a new character pair matcher that matches characters within the default partitioning.
* The specified list of characters must have the form { start, end,
* start, end, ..., start, end }
For instance:
*
*
* char[] chars= new char[] { '(', ')', '{', '}', '[', ']' };
* new DefaultCharacterPairMatcher(chars);
*
*
* @param chars a list of characters
*/
public DefaultCharacterPairMatcher(char[] chars) {
this(chars, IDocumentExtension3.DEFAULT_PARTITIONING);
}
/* @see ICharacterPairMatcher#match(IDocument, int) */
public IRegion match(IDocument doc, int offset) {
if (doc == null || offset < 0 || offset > doc.getLength()) return null;
try {
return performMatch(doc, offset);
} catch (BadLocationException ble) {
return null;
}
}
/**
* @see org.eclipse.jface.text.source.ICharacterPairMatcherExtension#match(org.eclipse.jface.text.IDocument,
* int, int)
* @since 3.8
*/
public IRegion match(IDocument document, int offset, int length) {
if (document == null || offset < 0 || offset > document.getLength() || Math.abs(length) > 1)
return null;
try {
int sourceCaretOffset= offset + length;
if (Math.abs(length) == 1) {
char ch= length > 0 ? document.getChar(offset) : document.getChar(sourceCaretOffset);
if (!fPairs.contains(ch))
return null;
}
int adjustment= getOffsetAdjustment(document, sourceCaretOffset, length);
sourceCaretOffset+= adjustment;
return match(document, sourceCaretOffset);
} catch (BadLocationException e) {
return null;
}
}
/**
* @see org.eclipse.jface.text.source.ICharacterPairMatcherExtension#findEnclosingPeerCharacters(org.eclipse.jface.text.IDocument,
* int, int)
* @since 3.8
*/
public IRegion findEnclosingPeerCharacters(IDocument document, int offset, int length) {
if (document == null || offset < 0 || offset > document.getLength())
return null;
//maybe a bracket is selected
IRegion region= match(document, offset, length);
fAnchor= ICharacterPairMatcher.LEFT; //always set the anchor to LEFT
if (region != null) {
return region;
}
//bracket is not selected
try {
final String partition= TextUtilities.getContentType(document, fPartitioning, offset, false);
DocumentPartitionAccessor partDoc= new DocumentPartitionAccessor(document, fPartitioning, partition);
IRegion enclosingPeers= findEnclosingPeers(document, partDoc, offset, length, 0, document.getLength());
if (enclosingPeers != null)
return enclosingPeers;
partDoc= new DocumentPartitionAccessor(document, fPartitioning, IDocument.DEFAULT_CONTENT_TYPE);
return findEnclosingPeers(document, partDoc, offset, length, 0, document.getLength());
} catch (BadLocationException ble) {
fAnchor= -1;
return null;
}
}
/**
* @see org.eclipse.jface.text.source.ICharacterPairMatcherExtension#isMatchedChar(char)
* @since 3.8
*/
public boolean isMatchedChar(char ch) {
return fPairs.contains(ch);
}
/**
* @see org.eclipse.jface.text.source.ICharacterPairMatcherExtension#isMatchedChar(char,
* org.eclipse.jface.text.IDocument, int)
* @since 3.8
*/
public boolean isMatchedChar(char ch, IDocument document, int offset) {
return isMatchedChar(ch);
}
/**
* @see org.eclipse.jface.text.source.ICharacterPairMatcherExtension#isRecomputationOfEnclosingPairRequired(org.eclipse.jface.text.IDocument,
* org.eclipse.jface.text.IRegion, org.eclipse.jface.text.IRegion)
* @since 3.8
*/
public boolean isRecomputationOfEnclosingPairRequired(IDocument document, IRegion currentSelection, IRegion previousSelection) {
int previousStartOffset= previousSelection.getOffset();
int currentStartOffset= currentSelection.getOffset();
int previousEndOffset= previousStartOffset + previousSelection.getLength();
int currentEndOffset= currentStartOffset + currentSelection.getLength();
try {
String prevEndContentType= TextUtilities.getContentType(document, fPartitioning, previousEndOffset, false);
String currEndContentType= TextUtilities.getContentType(document, fPartitioning, currentEndOffset, false);
if (!prevEndContentType.equals(currEndContentType))
return true;
String prevStartContentType= TextUtilities.getContentType(document, fPartitioning, previousStartOffset, true);
String currStartContentType= TextUtilities.getContentType(document, fPartitioning, currentStartOffset, true);
if (!prevStartContentType.equals(currStartContentType))
return true;
int start;
int end;
if (currentEndOffset > previousEndOffset) {
start= previousEndOffset;
end= currentEndOffset;
} else {
start= currentEndOffset;
end= previousEndOffset;
}
for (int i= Math.max(start - 1, 0); i <= end; i++) {
if (isMatchedChar(document.getChar(i))) {
return true;
}
}
if (currentStartOffset > previousStartOffset) {
start= previousStartOffset;
end= currentStartOffset;
} else {
start= currentStartOffset;
end= previousStartOffset;
}
for (int i= Math.max(start - 1, 0); i <= end; i++) {
if (isMatchedChar(document.getChar(i))) {
return true;
}
}
} catch (BadLocationException e) {
//do nothing
}
return false;
}
/**
* Computes the adjustment in the start offset for the purpose of finding a matching peer. This
* is required as the direction of selection can be right-to-left or left-to-right.
*
* @param document the document to work on
* @param offset the start offset
* @param length the selection length
* @return the start offset adjustment which can be -1, 0 or +1
* @since 3.8
*/
private int getOffsetAdjustment(IDocument document, int offset, int length) {
if (length == 0 || Math.abs(length) > 1 || offset >= document.getLength())
return 0;
try {
if (length < 0) {
if (fPairs.isStartCharacter(document.getChar(offset))) {
return 1;
}
} else {
if (fCaretEitherSideOfBracket && fPairs.isEndCharacter(document.getChar(offset - 1))) {
return -1;
}
}
} catch (BadLocationException e) {
//do nothing
}
return 0;
}
/*
* Performs the actual work of matching for #match(IDocument, int).
*/
private IRegion performMatch(IDocument doc, int caretOffset) throws BadLocationException {
char prevChar= (caretOffset - 1 >= 0) ? doc.getChar(caretOffset - 1) : Character.MIN_VALUE;
boolean isForward;
final char ch;
if (fCaretEitherSideOfBracket) {
char currChar= (caretOffset != doc.getLength()) ? doc.getChar(caretOffset) : Character.MIN_VALUE;
if (fPairs.isEndCharacter(prevChar) && !fPairs.isEndCharacter(currChar)) { //https://bugs.eclipse.org/bugs/show_bug.cgi?id=372516
caretOffset--;
currChar= prevChar;
prevChar= doc.getChar(Math.max(caretOffset - 1, 0));
} else if (fPairs.isStartCharacter(currChar) && !fPairs.contains(prevChar)) {
caretOffset++;
prevChar= currChar;
currChar= doc.getChar(caretOffset);
}
isForward= fPairs.contains(prevChar) && fPairs.isStartCharacter(prevChar);
boolean isBackward= fPairs.contains(currChar) && !fPairs.isStartCharacter(currChar);
if (!isForward && !isBackward) {
return null;
}
ch= isForward ? prevChar : currChar;
} else {
if (!fPairs.contains(prevChar))
return null;
isForward= fPairs.isStartCharacter(prevChar);
ch= prevChar;
}
fAnchor= isForward ? ICharacterPairMatcher.LEFT : ICharacterPairMatcher.RIGHT;
final int searchStartPosition= isForward ? caretOffset : (fCaretEitherSideOfBracket ? caretOffset - 1 : caretOffset - 2);
final int adjustedOffset= isForward ? caretOffset - 1 : (fCaretEitherSideOfBracket ? caretOffset + 1 : caretOffset);
final String partition= TextUtilities.getContentType(doc, fPartitioning, ((!isForward && fCaretEitherSideOfBracket) ? caretOffset : Math.max(caretOffset - 1, 0)), false);
final DocumentPartitionAccessor partDoc= new DocumentPartitionAccessor(doc, fPartitioning, partition);
int endOffset= findMatchingPeer(partDoc, ch, fPairs.getMatching(ch),
isForward, isForward ? doc.getLength() : -1, searchStartPosition);
if (endOffset == -1)
return null;
final int adjustedEndOffset= isForward ? endOffset + 1 : endOffset;
if (adjustedEndOffset == adjustedOffset)
return null;
return new Region(Math.min(adjustedOffset, adjustedEndOffset),
Math.abs(adjustedEndOffset - adjustedOffset));
}
/**
* Searches doc for the specified end character, end.
*
* @param doc the document to search
* @param start the opening matching character
* @param end the end character to search for
* @param searchForward search forwards or backwards?
* @param boundary a boundary at which the search should stop
* @param startPos the start offset
* @return the index of the end character if it was found, otherwise -1
* @throws BadLocationException if the document is accessed with invalid offset or line
*/
private int findMatchingPeer(DocumentPartitionAccessor doc, char start, char end, boolean searchForward, int boundary, int startPos) throws BadLocationException {
int pos= startPos;
int nestingLevel= 0;
while (pos != boundary) {
final char c= doc.getChar(pos);
if (c == end && doc.inPartition(pos)) {
if (nestingLevel == 0)
return pos;
nestingLevel--;
} else if (c == start && doc.inPartition(pos)) {
nestingLevel++;
}
pos= doc.getNextPosition(pos, searchForward);
}
return -1;
}
/*
* Performs the actual work of finding enclosing peer characters for #findEnclosingPeerCharacters(IDocument, int, int).
*/
private IRegion findEnclosingPeers(IDocument document, DocumentPartitionAccessor doc, int offset, int length, int lowerBoundary, int upperBoundary) throws BadLocationException {
char[] pairs= fPairs.fPairs;
int start;
int end;
if (length >= 0) {
start= offset;
end= offset + length;
} else {
end= offset;
start= offset + length;
}
boolean lowerFound= false;
boolean upperFound= false;
int[][] counts= new int[pairs.length][2];
char currChar= (start != document.getLength()) ? doc.getChar(start) : Character.MIN_VALUE;
int pos1;
int pos2;
if (fPairs.isEndCharacter(currChar)) {
pos1= doc.getNextPosition(start, false);
pos2= start;
} else {
pos1= start;
pos2= doc.getNextPosition(start, true);
}
while ((pos1 >= lowerBoundary && !lowerFound) || (pos2 < upperBoundary && !upperFound)) {
for (int i= 0; i < counts.length; i++) {
counts[i][0]= counts[i][1]= 0;
}
outer1: while (pos1 >= lowerBoundary && !lowerFound) {
final char c= doc.getChar(pos1);
int i= getCharacterIndex(c, document, pos1);
if (i != -1 && doc.inPartition(pos1)) {
if (i % 2 == 0) {
counts[i / 2][0]--; //start
} else {
counts[i / 2][0]++; //end
}
for (int j= 0; j < counts.length; j++) {
if (counts[j][0] == -1) {
lowerFound= true;
break outer1;
}
}
}
pos1= doc.getNextPosition(pos1, false);
}
outer2: while (pos2 < upperBoundary && !upperFound) {
final char c= doc.getChar(pos2);
int i= getCharacterIndex(c, document, pos2);
if (i != -1 && doc.inPartition(pos2)) {
if (i % 2 == 0) {
counts[i / 2][1]++; //start
} else {
counts[i / 2][1]--; //end
}
for (int j= 0; j < counts.length; j++) {
if (counts[j][1] == -1 && counts[j][0] == -1) {
upperFound= true;
break outer2;
}
}
}
pos2= doc.getNextPosition(pos2, true);
}
if (pos1 > start || pos2 < end - 1) {
//match inside selection => discard
pos1= doc.getNextPosition(pos1, false);
pos2= doc.getNextPosition(pos2, true);
lowerFound= false;
upperFound= false;
}
}
pos2++;
if (pos1 < lowerBoundary || pos2 > upperBoundary)
return null;
return new Region(pos1, pos2 - pos1);
}
/**
* Determines the index of the character in the char array passed to the constructor of the pair
* matcher.
*
* @param ch the character
* @param document the document
* @param offset the offset in document
* @return the index of the character in the char array passed to the constructor of the pair
* matcher, and -1 if the character is not one of the matched characters
* @since 3.8
*/
private int getCharacterIndex(char ch, IDocument document, int offset) {
char[] pairs= fPairs.fPairs;
for (int i= 0; i < pairs.length; i++) {
if (pairs[i] == ch && isMatchedChar(ch, document, offset)) {
return i;
}
}
return -1;
}
/* @see ICharacterPairMatcher#getAnchor() */
public int getAnchor() {
return fAnchor;
}
/* @see ICharacterPairMatcher#dispose() */
public void dispose() { }
/* @see ICharacterPairMatcher#clear() */
public void clear() {
fAnchor= -1;
}
/**
* Utility class that wraps a document and gives access to
* partitioning information. A document is tied to a particular
* partition and, when considering whether or not a position is a
* valid match, only considers position within its partition.
*/
private static class DocumentPartitionAccessor {
private final IDocument fDocument;
private final String fPartitioning, fPartition;
private ITypedRegion fCachedPartition;
private int fLength;
/**
* Creates a new partitioned document for the specified document.
*
* @param doc the document to wrap
* @param partitioning the partitioning used
* @param partition the partition managed by this document
*/
public DocumentPartitionAccessor(IDocument doc, String partitioning,
String partition) {
fDocument= doc;
fPartitioning= partitioning;
fPartition= partition;
fLength= doc.getLength();
}
/**
* Returns the character at the specified position in this document.
*
* @param pos an offset within this document
* @return the character at the offset
* @throws BadLocationException if the offset is invalid in this document
*/
public char getChar(int pos) throws BadLocationException {
return fDocument.getChar(pos);
}
/**
* Returns true if the specified offset is within the partition
* managed by this document.
*
* @param pos an offset within this document
* @return true if the offset is within this document's partition
*/
public boolean inPartition(int pos) {
final ITypedRegion partition= getPartition(pos);
return partition != null && partition.getType().equals(fPartition);
}
/**
* Returns the next position to query in the search. The position
* is not guaranteed to be in this document's partition.
*
* @param pos an offset within the document
* @param searchForward the direction of the search
* @return the next position to query
*/
public int getNextPosition(int pos, boolean searchForward) {
final ITypedRegion partition= getPartition(pos);
if (partition == null || fPartition.equals(partition.getType()))
return simpleIncrement(pos, searchForward);
if (searchForward) {
int end= partition.getOffset() + partition.getLength();
if (pos < end)
return end;
} else {
int offset= partition.getOffset();
if (pos > offset)
return offset - 1;
}
return simpleIncrement(pos, searchForward);
}
private int simpleIncrement(int pos, boolean searchForward) {
return pos + (searchForward ? 1 : -1);
}
/**
* Returns partition information about the region containing the
* specified position.
*
* @param pos a position within this document.
* @return positioning information about the region containing the
* position
*/
private ITypedRegion getPartition(int pos) {
if (fCachedPartition == null || !contains(fCachedPartition, pos)) {
Assert.isTrue(pos >= 0 && pos <= fLength);
try {
fCachedPartition= TextUtilities.getPartition(fDocument, fPartitioning, pos, false);
} catch (BadLocationException e) {
fCachedPartition= null;
}
}
return fCachedPartition;
}
private static boolean contains(IRegion region, int pos) {
int offset= region.getOffset();
return offset <= pos && pos < offset + region.getLength();
}
}
/**
* Utility class that encapsulates access to matching character pairs.
*/
private static class CharPairs {
private final char[] fPairs;
public CharPairs(char[] pairs) {
fPairs= pairs;
}
/**
* Returns true if the specified character occurs in one of the character pairs.
*
* @param c a character
* @return true exactly if the character occurs in one of the pairs
*/
public boolean contains(char c) {
char[] pairs= fPairs;
for (int i= 0, n= pairs.length; i < n; i++) {
if (c == pairs[i])
return true;
}
return false;
}
/**
* Returns true if the specified character opens a character pair
* when scanning in the specified direction.
*
* @param c a character
* @param searchForward the direction of the search
* @return whether or not the character opens a character pair
*/
public boolean isOpeningCharacter(char c, boolean searchForward) {
for (int i= 0; i < fPairs.length; i += 2) {
if (searchForward && getStartChar(i) == c) return true;
else if (!searchForward && getEndChar(i) == c) return true;
}
return false;
}
/**
* Returns true if the specified character is a start character.
*
* @param c a character
* @return true exactly if the character is a start character
*/
public boolean isStartCharacter(char c) {
return this.isOpeningCharacter(c, true);
}
/**
* Returns true if the specified character is an end character.
*
* @param c a character
* @return true exactly if the character is an end character
* @since 3.8
*/
public boolean isEndCharacter(char c) {
return this.isOpeningCharacter(c, false);
}
/**
* Returns the matching character for the specified character.
*
* @param c a character occurring in a character pair
* @return the matching character
*/
public char getMatching(char c) {
for (int i= 0; i < fPairs.length; i += 2) {
if (getStartChar(i) == c) return getEndChar(i);
else if (getEndChar(i) == c) return getStartChar(i);
}
Assert.isTrue(false);
return '\0';
}
private char getStartChar(int i) {
return fPairs[i];
}
private char getEndChar(int i) {
return fPairs[i + 1];
}
}
}
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