| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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.jdt.internal.ui.text; |
| |
| 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.TextUtilities; |
| import org.eclipse.jface.text.source.ICharacterPairMatcher; |
| |
| import org.eclipse.jdt.core.JavaCore; |
| |
| import org.eclipse.jdt.ui.text.IJavaPartitions; |
| |
| /** |
| * Helper class for match pairs of characters. |
| */ |
| public final class JavaPairMatcher implements ICharacterPairMatcher, ISourceVersionDependent { |
| |
| private char[] fPairs; |
| private IDocument fDocument; |
| private int fOffset; |
| |
| private int fStartPos; |
| private int fEndPos; |
| private int fAnchor; |
| |
| /** |
| * Stores the source version state. |
| * @since 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 (fOffset < 0) |
| 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; |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.source.ICharacterPairMatcher#clear() |
| */ |
| public void clear() { |
| } |
| |
| private boolean matchPairsAt() { |
| |
| int i; |
| int pairIndex1= fPairs.length; |
| int pairIndex2= fPairs.length; |
| |
| fStartPos= -1; |
| fEndPos= -1; |
| |
| // get the char preceding the start position |
| try { |
| |
| char prevChar= fDocument.getChar(Math.max(fOffset - 1, 0)); |
| // search for opening peer character next to the activation point |
| for (i= 0; i < fPairs.length; i= i + 2) { |
| 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; |
| } |
| } |
| |
| 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) { |
| } |
| |
| return false; |
| } |
| |
| private int searchForClosingPeer(int offset, char openingPeer, char closingPeer, IDocument document) throws BadLocationException { |
| boolean useGenericsHeuristic= openingPeer == '<'; |
| if (useGenericsHeuristic && !fHighlightAngularBrackets) |
| return -1; |
| JavaHeuristicScanner scanner= new JavaHeuristicScanner(document, IJavaPartitions.JAVA_PARTITIONING, TextUtilities.getContentType(document, IJavaPartitions.JAVA_PARTITIONING, offset, false)); |
| if (useGenericsHeuristic && !isTypeParameterBracket(offset, document, scanner)) |
| return -1; |
| |
| return scanner.findClosingPeer(offset + 1, openingPeer, closingPeer); |
| } |
| |
| |
| private int searchForOpeningPeer(int offset, char openingPeer, char closingPeer, IDocument document) throws BadLocationException { |
| boolean useGenericsHeuristic= openingPeer == '<'; |
| if (useGenericsHeuristic && !fHighlightAngularBrackets) |
| return -1; |
| |
| JavaHeuristicScanner scanner= new JavaHeuristicScanner(document, IJavaPartitions.JAVA_PARTITIONING, TextUtilities.getContentType(document, IJavaPartitions.JAVA_PARTITIONING, offset, false)); |
| int peer= scanner.findOpeningPeer(offset - 1, openingPeer, closingPeer); |
| if (peer == JavaHeuristicScanner.NOT_FOUND) |
| return -1; |
| if (useGenericsHeuristic && !isTypeParameterBracket(peer, document, scanner)) |
| return -1; |
| return peer; |
| } |
| |
| /** |
| * 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 |
| * @param scanner a java heuristic scanner on <code>document</code> |
| * @return <code>true</code> if the bracket is part of a type parameter, |
| * <code>false</code> otherwise |
| * @since 3.1 |
| */ |
| private boolean isTypeParameterBracket(int offset, IDocument document, JavaHeuristicScanner scanner) { |
| /* |
| * 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); |
| |
| 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 |
| * @since 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")); //$NON-NLS-1$ |
| } |
| |
| /* |
| * @see org.eclipse.jdt.internal.ui.text.ISourceVersionDependent#setSourceVersion(java.lang.String) |
| */ |
| public void setSourceVersion(String version) { |
| if (JavaCore.VERSION_1_5.compareTo(version) <= 0) |
| fHighlightAngularBrackets= true; |
| else |
| fHighlightAngularBrackets= false; |
| } |
| } |