bundles/org.eclipse.wst.html.ui/src/org/eclipse/wst/html/ui/internal/text/JavaPairMatcher.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2001, 2005 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:
  *     IBM Corporation - initial API and implementation
  *
  *******************************************************************************/
 package org.eclipse.wst.html.ui.internal.text;

 // taken from package org.eclipse.jdt.ui.text;

 import java.io.IOException;

 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.IRegion;
 import org.eclipse.jface.text.Region;
 import org.eclipse.jface.text.source.ICharacterPairMatcher;

 class JavaPairMatcher implements ICharacterPairMatcher {

 	protected char[] fPairs;
 	protected IDocument fDocument;
 	protected int fOffset;

 	protected int fStartPos;
 	protected int fEndPos;
 	protected int fAnchor;

 	protected JavaCodeReader fReader = new JavaCodeReader();
 	/**
 	 * Stores the source version state.
 	 *
 	 * @see Eclipse  3.1
 	 */
 	private boolean fHighlightAngularBrackets = false;


 	public JavaPairMatcher(char[] pairs) {
 		fPairs = pairs;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#match(org.eclipse.jface.text.IDocument,
 	 *      int)
 	 */
 	public IRegion match(IDocument document, int offset) {
 		fOffset = offset;

 		if(offset < 0 || offset >= document.getLength())
 			return null;

 		fDocument = document;

 		if (fDocument != null && matchPairsAt() && fStartPos != fEndPos)
 			return new Region(fStartPos, fEndPos - fStartPos + 1);

 		return null;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#getAnchor()
 	 */
 	public int getAnchor() {
 		return fAnchor;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#dispose()
 	 */
 	public void dispose() {
 		clear();
 		fDocument = null;
 		fReader = null;
 	}

 	/*
 	 * @see org.eclipse.jface.text.source.ICharacterPairMatcher#clear()
 	 */
 	public void clear() {
 		if (fReader != null) {
 			try {
 				fReader.close();
 			}
 			catch (IOException x) {
 				// ignore
 			}
 		}
 	}

 	protected boolean matchPairsAt() {

 		int i;
 		int pairIndex1 = fPairs.length;
 		int pairIndex2 = fPairs.length;

 		fStartPos = -1;
 		fEndPos = -1;

 		// get the chars preceding and following the start position
 		try {

 			char prevChar = fDocument.getChar(Math.max(fOffset - 1, 0));
 			// modified behavior for
 			// http://dev.eclipse.org/bugs/show_bug.cgi?id=16879
 			// char nextChar= fDocument.getChar(fOffset);

 			// search for opening peer character next to the activation point
 			for (i = 0; i < fPairs.length; i = i + 2) {
 				// if (nextChar == fPairs[i]) {
 				// fStartPos= fOffset;
 				// pairIndex1= i;
 				// } else
 				if (prevChar == fPairs[i]) {
 					fStartPos = fOffset - 1;
 					pairIndex1 = i;
 				}
 			}

 			// search for closing peer character next to the activation point
 			for (i = 1; i < fPairs.length; i = i + 2) {
 				if (prevChar == fPairs[i]) {
 					fEndPos = fOffset - 1;
 					pairIndex2 = i;
 				}
 				// else if (nextChar == fPairs[i]) {
 				// fEndPos= fOffset;
 				// pairIndex2= i;
 				// }
 			}

 			if (fEndPos > -1) {
 				fAnchor = RIGHT;
 				fStartPos = searchForOpeningPeer(fEndPos, fPairs[pairIndex2 - 1], fPairs[pairIndex2], fDocument);
 				if (fStartPos > -1)
 					return true;
 				else
 					fEndPos = -1;
 			}
 			else if (fStartPos > -1) {
 				fAnchor = LEFT;
 				fEndPos = searchForClosingPeer(fStartPos, fPairs[pairIndex1], fPairs[pairIndex1 + 1], fDocument);
 				if (fEndPos > -1)
 					return true;
 				else
 					fStartPos = -1;
 			}

 		}
 		catch (BadLocationException x) {
 		}
 		catch (IOException x) {
 		}

 		return false;
 	}

 	protected int searchForClosingPeer(int offset, int openingPeer, int closingPeer, IDocument document) throws IOException {
 		if (openingPeer == '<' && !(fHighlightAngularBrackets && isTypeParameterBracket(offset, document)))
 			return -1;

 		fReader.configureForwardReader(document, offset + 1, document.getLength(), true, true);

 		int stack = 1;
 		int c = fReader.read();
 		while (c != JavaCodeReader.EOF) {
 			if (c == openingPeer && c != closingPeer)
 				stack++;
 			else if (c == closingPeer)
 				stack--;

 			if (stack == 0)
 				return fReader.getOffset();

 			c = fReader.read();
 		}

 		return -1;
 	}


 	protected int searchForOpeningPeer(int offset, int openingPeer, int closingPeer, IDocument document) throws IOException {
 		if (openingPeer == '<' && !fHighlightAngularBrackets)
 			return -1;

 		fReader.configureBackwardReader(document, offset, true, true);

 		int stack = 1;
 		int c = fReader.read();
 		while (c != JavaCodeReader.EOF) {
 			if (c == closingPeer && c != openingPeer)
 				stack++;
 			else if (c == openingPeer)
 				stack--;

 			if (stack == 0) {
 				if (closingPeer == '>' && !isTypeParameterBracket(fReader.getOffset(), document))
 					return -1;
 				return fReader.getOffset();
 			}

 			c = fReader.read();
 		}

 		return -1;
 	}

 	/**
 	 * Checks if the angular bracket at <code>offset</code> is a type
 	 * parameter bracket.
 	 *
 	 * @param offset
 	 *            the offset of the opening bracket
 	 * @param document
 	 *            the document
 	 * @return <code>true</code> if the bracket is part of a type parameter,
 	 *         <code>false</code> otherwise
 	 * @see Eclipse  3.1
 	 */
 	private boolean isTypeParameterBracket(int offset, IDocument document) {
 		/*
 		 * type parameter come after braces (closing or opening), semicolons,
 		 * or after a Type name (heuristic: starts with capital character, or
 		 * after a modifier keyword in a method declaration (visibility,
 		 * static, synchronized, final)
 		 */

 		try {
 			IRegion line = document.getLineInformationOfOffset(offset);

 			JavaHeuristicScanner scanner = new JavaHeuristicScanner(document);
 			int prevToken = scanner.previousToken(offset - 1, line.getOffset());
 			int prevTokenOffset = scanner.getPosition() + 1;
 			String previous = prevToken == Symbols.TokenEOF ? null : document.get(prevTokenOffset, offset - prevTokenOffset).trim();

 			if (prevToken == Symbols.TokenLBRACE || prevToken == Symbols.TokenRBRACE || prevToken == Symbols.TokenSEMICOLON || prevToken == Symbols.TokenSYNCHRONIZED || prevToken == Symbols.TokenSTATIC || (prevToken == Symbols.TokenIDENT && isTypeParameterIntroducer(previous)) || prevToken == Symbols.TokenEOF)
 				return true;
 		}
 		catch (BadLocationException e) {
 			return false;
 		}

 		return false;
 	}

 	/**
 	 * Returns <code>true</code> if <code>identifier</code> is an
 	 * identifier that could come right before a type parameter list. It uses
 	 * a heuristic: if the identifier starts with an upper case, it is assumed
 	 * a type name. Also, if <code>identifier</code> is a method modifier,
 	 * it is assumed that the angular bracket is part of the generic type
 	 * parameter of a method.
 	 *
 	 * @param identifier
 	 *            the identifier to check
 	 * @return <code>true</code> if the identifier could introduce a type
 	 *         parameter list
 	 * @see Eclipse  3.1
 	 */
 	private boolean isTypeParameterIntroducer(String identifier) {
 		return identifier.length() > 0 && (Character.isUpperCase(identifier.charAt(0)) || identifier.startsWith("final") //$NON-NLS-1$
 					|| identifier.startsWith("public") //$NON-NLS-1$
 					|| identifier.startsWith("public") //$NON-NLS-1$
 					|| identifier.startsWith("protected") //$NON-NLS-1$
 		|| identifier.startsWith("private")); //$NON-NLS-1$
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2001, 2005 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:
	* IBM Corporation - initial API and implementation
	*
	*******************************************************************************/
	package org.eclipse.wst.html.ui.internal.text;

	// taken from package org.eclipse.jdt.ui.text;

	import java.io.IOException;

	import org.eclipse.jface.text.BadLocationException;
	import org.eclipse.jface.text.IDocument;
	import org.eclipse.jface.text.IRegion;
	import org.eclipse.jface.text.Region;
	import org.eclipse.jface.text.source.ICharacterPairMatcher;

	class JavaPairMatcher implements ICharacterPairMatcher {

	protected char[] fPairs;
	protected IDocument fDocument;
	protected int fOffset;

	protected int fStartPos;
	protected int fEndPos;
	protected int fAnchor;

	protected JavaCodeReader fReader = new JavaCodeReader();
	/**
	* Stores the source version state.
	*
	* @see Eclipse 3.1
	*/
	private boolean fHighlightAngularBrackets = false;


	public JavaPairMatcher(char[] pairs) {
	fPairs = pairs;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.text.source.ICharacterPairMatcher#match(org.eclipse.jface.text.IDocument,
	* int)
	*/
	public IRegion match(IDocument document, int offset) {
	fOffset = offset;

	if(offset < 0 \|\| offset >= document.getLength())
	return null;

	fDocument = document;

	if (fDocument != null && matchPairsAt() && fStartPos != fEndPos)
	return new Region(fStartPos, fEndPos - fStartPos + 1);

	return null;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.text.source.ICharacterPairMatcher#getAnchor()
	*/
	public int getAnchor() {
	return fAnchor;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.text.source.ICharacterPairMatcher#dispose()
	*/
	public void dispose() {
	clear();
	fDocument = null;
	fReader = null;
	}

	/*
	* @see org.eclipse.jface.text.source.ICharacterPairMatcher#clear()
	*/
	public void clear() {
	if (fReader != null) {
	try {
	fReader.close();
	}
	catch (IOException x) {
	// ignore
	}
	}
	}

	protected boolean matchPairsAt() {

	int i;
	int pairIndex1 = fPairs.length;
	int pairIndex2 = fPairs.length;

	fStartPos = -1;
	fEndPos = -1;

	// get the chars preceding and following the start position
	try {

	char prevChar = fDocument.getChar(Math.max(fOffset - 1, 0));
	// modified behavior for
	// http://dev.eclipse.org/bugs/show_bug.cgi?id=16879
	// char nextChar= fDocument.getChar(fOffset);

	// search for opening peer character next to the activation point
	for (i = 0; i < fPairs.length; i = i + 2) {
	// if (nextChar == fPairs[i]) {
	// fStartPos= fOffset;
	// pairIndex1= i;
	// } else
	if (prevChar == fPairs[i]) {
	fStartPos = fOffset - 1;
	pairIndex1 = i;
	}
	}

	// search for closing peer character next to the activation point
	for (i = 1; i < fPairs.length; i = i + 2) {
	if (prevChar == fPairs[i]) {
	fEndPos = fOffset - 1;
	pairIndex2 = i;
	}
	// else if (nextChar == fPairs[i]) {
	// fEndPos= fOffset;
	// pairIndex2= i;
	// }
	}

	if (fEndPos > -1) {
	fAnchor = RIGHT;
	fStartPos = searchForOpeningPeer(fEndPos, fPairs[pairIndex2 - 1], fPairs[pairIndex2], fDocument);
	if (fStartPos > -1)
	return true;
	else
	fEndPos = -1;
	}
	else if (fStartPos > -1) {
	fAnchor = LEFT;
	fEndPos = searchForClosingPeer(fStartPos, fPairs[pairIndex1], fPairs[pairIndex1 + 1], fDocument);
	if (fEndPos > -1)
	return true;
	else
	fStartPos = -1;
	}

	}
	catch (BadLocationException x) {
	}
	catch (IOException x) {
	}

	return false;
	}

	protected int searchForClosingPeer(int offset, int openingPeer, int closingPeer, IDocument document) throws IOException {
	if (openingPeer == '<' && !(fHighlightAngularBrackets && isTypeParameterBracket(offset, document)))
	return -1;

	fReader.configureForwardReader(document, offset + 1, document.getLength(), true, true);

	int stack = 1;
	int c = fReader.read();
	while (c != JavaCodeReader.EOF) {
	if (c == openingPeer && c != closingPeer)
	stack++;
	else if (c == closingPeer)
	stack--;

	if (stack == 0)
	return fReader.getOffset();

	c = fReader.read();
	}

	return -1;
	}


	protected int searchForOpeningPeer(int offset, int openingPeer, int closingPeer, IDocument document) throws IOException {
	if (openingPeer == '<' && !fHighlightAngularBrackets)
	return -1;

	fReader.configureBackwardReader(document, offset, true, true);

	int stack = 1;
	int c = fReader.read();
	while (c != JavaCodeReader.EOF) {
	if (c == closingPeer && c != openingPeer)
	stack++;
	else if (c == openingPeer)
	stack--;

	if (stack == 0) {
	if (closingPeer == '>' && !isTypeParameterBracket(fReader.getOffset(), document))
	return -1;
	return fReader.getOffset();
	}

	c = fReader.read();
	}

	return -1;
	}

	/**
	* Checks if the angular bracket at <code>offset</code> is a type
	* parameter bracket.
	*
	* @param offset
	* the offset of the opening bracket
	* @param document
	* the document
	* @return <code>true</code> if the bracket is part of a type parameter,
	* <code>false</code> otherwise
	* @see Eclipse 3.1
	*/
	private boolean isTypeParameterBracket(int offset, IDocument document) {
	/*
	* type parameter come after braces (closing or opening), semicolons,
	* or after a Type name (heuristic: starts with capital character, or
	* after a modifier keyword in a method declaration (visibility,
	* static, synchronized, final)
	*/

	try {
	IRegion line = document.getLineInformationOfOffset(offset);

	JavaHeuristicScanner scanner = new JavaHeuristicScanner(document);
	int prevToken = scanner.previousToken(offset - 1, line.getOffset());
	int prevTokenOffset = scanner.getPosition() + 1;
	String previous = prevToken == Symbols.TokenEOF ? null : document.get(prevTokenOffset, offset - prevTokenOffset).trim();

	if (prevToken == Symbols.TokenLBRACE \|\| prevToken == Symbols.TokenRBRACE \|\| prevToken == Symbols.TokenSEMICOLON \|\| prevToken == Symbols.TokenSYNCHRONIZED \|\| prevToken == Symbols.TokenSTATIC \|\| (prevToken == Symbols.TokenIDENT && isTypeParameterIntroducer(previous)) \|\| prevToken == Symbols.TokenEOF)
	return true;
	}
	catch (BadLocationException e) {
	return false;
	}

	return false;
	}

	/**
	* Returns <code>true</code> if <code>identifier</code> is an
	* identifier that could come right before a type parameter list. It uses
	* a heuristic: if the identifier starts with an upper case, it is assumed
	* a type name. Also, if <code>identifier</code> is a method modifier,
	* it is assumed that the angular bracket is part of the generic type
	* parameter of a method.
	*
	* @param identifier
	* the identifier to check
	* @return <code>true</code> if the identifier could introduce a type
	* parameter list
	* @see Eclipse 3.1
	*/
	private boolean isTypeParameterIntroducer(String identifier) {
	return identifier.length() > 0 && (Character.isUpperCase(identifier.charAt(0)) \|\| identifier.startsWith("final") //$NON-NLS-1$
	\|\| identifier.startsWith("public") //$NON-NLS-1$
	\|\| identifier.startsWith("public") //$NON-NLS-1$
	\|\| identifier.startsWith("protected") //$NON-NLS-1$
	\|\| identifier.startsWith("private")); //$NON-NLS-1$
	}
	}