| /******************************************************************************* |
| * 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.java; |
| |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.custom.StyleRange; |
| |
| import org.eclipse.jface.text.Assert; |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.TextPresentation; |
| import org.eclipse.jface.text.contentassist.IContextInformation; |
| import org.eclipse.jface.text.contentassist.IContextInformationPresenter; |
| import org.eclipse.jface.text.contentassist.IContextInformationValidator; |
| |
| import org.eclipse.jdt.internal.ui.text.JavaHeuristicScanner; |
| |
| |
| |
| public class JavaParameterListValidator implements IContextInformationValidator, IContextInformationPresenter { |
| |
| private int fPosition; |
| private ITextViewer fViewer; |
| private IContextInformation fInformation; |
| |
| private int fCurrentParameter; |
| |
| |
| |
| public JavaParameterListValidator() { |
| } |
| |
| /** |
| * @see IContextInformationValidator#install(IContextInformation, ITextViewer, int) |
| * @see IContextInformationPresenter#install(IContextInformation, ITextViewer, int) |
| */ |
| public void install(IContextInformation info, ITextViewer viewer, int documentPosition) { |
| fPosition= documentPosition; |
| fViewer= viewer; |
| fInformation= info; |
| |
| fCurrentParameter= -1; |
| } |
| |
| private int getCommentEnd(IDocument d, int pos, int end) throws BadLocationException { |
| while (pos < end) { |
| char curr= d.getChar(pos); |
| pos++; |
| if (curr == '*') { |
| if (pos < end && d.getChar(pos) == '/') { |
| return pos + 1; |
| } |
| } |
| } |
| return end; |
| } |
| |
| private int getStringEnd(IDocument d, int pos, int end, char ch) throws BadLocationException { |
| while (pos < end) { |
| char curr= d.getChar(pos); |
| pos++; |
| if (curr == '\\') { |
| // ignore escaped characters |
| pos++; |
| } else if (curr == ch) { |
| return pos; |
| } |
| } |
| return end; |
| } |
| |
| private int getCharCount(IDocument document, final int start, final int end, String increments, String decrements, boolean considerNesting) throws BadLocationException { |
| |
| Assert.isTrue((increments.length() != 0 || decrements.length() != 0) && !increments.equals(decrements)); |
| |
| final int NONE= 0; |
| final int BRACKET= 1; |
| final int BRACE= 2; |
| final int PAREN= 3; |
| final int ANGLE= 4; |
| |
| int nestingMode= NONE; |
| int nestingLevel= 0; |
| |
| int charCount= 0; |
| int offset= start; |
| while (offset < end) { |
| char curr= document.getChar(offset++); |
| switch (curr) { |
| case '/': |
| if (offset < end) { |
| char next= document.getChar(offset); |
| if (next == '*') { |
| // a comment starts, advance to the comment end |
| offset= getCommentEnd(document, offset + 1, end); |
| } else if (next == '/') { |
| // '//'-comment: nothing to do anymore on this line |
| offset= end; |
| } |
| } |
| break; |
| case '*': |
| if (offset < end) { |
| char next= document.getChar(offset); |
| if (next == '/') { |
| // we have been in a comment: forget what we read before |
| charCount= 0; |
| ++ offset; |
| } |
| } |
| break; |
| case '"': |
| case '\'': |
| offset= getStringEnd(document, offset, end, curr); |
| break; |
| case '[': |
| if (considerNesting) { |
| if (nestingMode == BRACKET || nestingMode == NONE) { |
| nestingMode= BRACKET; |
| nestingLevel++; |
| } |
| break; |
| } |
| case ']': |
| if (considerNesting) { |
| if (nestingMode == BRACKET) |
| if (--nestingLevel == 0) |
| nestingMode= NONE; |
| break; |
| } |
| case '(': |
| if (considerNesting) { |
| if (nestingMode == ANGLE) { |
| // generics heuristic failed |
| nestingMode=PAREN; |
| nestingLevel= 1; |
| } |
| if (nestingMode == PAREN || nestingMode == NONE) { |
| nestingMode= PAREN; |
| nestingLevel++; |
| } |
| break; |
| } |
| case ')': |
| if (considerNesting) { |
| if (nestingMode == PAREN) |
| if (--nestingLevel == 0) |
| nestingMode= NONE; |
| break; |
| } |
| case '{': |
| if (considerNesting) { |
| if (nestingMode == ANGLE) { |
| // generics heuristic failed |
| nestingMode=BRACE; |
| nestingLevel= 1; |
| } |
| if (nestingMode == BRACE || nestingMode == NONE) { |
| nestingMode= BRACE; |
| nestingLevel++; |
| } |
| break; |
| } |
| case '}': |
| if (considerNesting) { |
| if (nestingMode == BRACE) |
| if (--nestingLevel == 0) |
| nestingMode= NONE; |
| break; |
| } |
| case '<': |
| if (considerNesting) { |
| if (nestingMode == ANGLE || nestingMode == NONE && checkGenericsHeuristic(document, offset - 1, start - 1)) { |
| nestingMode= ANGLE; |
| nestingLevel++; |
| } |
| break; |
| } |
| case '>': |
| if (considerNesting) { |
| if (nestingMode == ANGLE) |
| if (--nestingLevel == 0) |
| nestingMode= NONE; |
| break; |
| } |
| |
| default: |
| if (nestingLevel != 0) |
| continue; |
| |
| if (increments.indexOf(curr) >= 0) { |
| ++ charCount; |
| } |
| |
| if (decrements.indexOf(curr) >= 0) { |
| -- charCount; |
| } |
| } |
| } |
| |
| return charCount; |
| } |
| |
| private boolean checkGenericsHeuristic(IDocument document, int end, int bound) throws BadLocationException { |
| JavaHeuristicScanner scanner= new JavaHeuristicScanner(document); |
| return scanner.looksLikeClassInstanceCreationBackward(end, bound); |
| } |
| |
| /** |
| * @see IContextInformationValidator#isContextInformationValid(int) |
| */ |
| public boolean isContextInformationValid(int position) { |
| |
| try { |
| if (position < fPosition) |
| return false; |
| |
| IDocument document= fViewer.getDocument(); |
| IRegion line= document.getLineInformationOfOffset(fPosition); |
| |
| if (position < line.getOffset() || position >= document.getLength()) |
| return false; |
| |
| return getCharCount(document, fPosition, position, "(<", ")>", false) >= 0; //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| } catch (BadLocationException x) { |
| return false; |
| } |
| } |
| |
| /** |
| * @see IContextInformationPresenter#updatePresentation(int, TextPresentation) |
| */ |
| public boolean updatePresentation(int position, TextPresentation presentation) { |
| |
| int currentParameter= -1; |
| |
| try { |
| currentParameter= getCharCount(fViewer.getDocument(), fPosition, position, ",", "", true); //$NON-NLS-1$//$NON-NLS-2$ |
| } catch (BadLocationException x) { |
| return false; |
| } |
| |
| if (fCurrentParameter != -1) { |
| if (currentParameter == fCurrentParameter) |
| return false; |
| } |
| |
| presentation.clear(); |
| fCurrentParameter= currentParameter; |
| |
| String s= fInformation.getInformationDisplayString(); |
| int[] commas= computeCommaPositions(s); |
| |
| if (commas.length - 2 < fCurrentParameter) { |
| presentation.addStyleRange(new StyleRange(0, s.length(), null, null, SWT.NORMAL)); |
| return true; |
| } |
| |
| int start= commas[fCurrentParameter] + 1; |
| int end= commas[fCurrentParameter + 1]; |
| if (start > 0) |
| presentation.addStyleRange(new StyleRange(0, start, null, null, SWT.NORMAL)); |
| |
| if (end > start) |
| presentation.addStyleRange(new StyleRange(start, end - start, null, null, SWT.BOLD)); |
| |
| if (end < s.length()) |
| presentation.addStyleRange(new StyleRange(end, s.length() - end, null, null, SWT.NORMAL)); |
| |
| return true; |
| } |
| |
| private int[] computeCommaPositions(String code) { |
| final int length= code.length(); |
| int pos= 0; |
| List positions= new ArrayList(); |
| positions.add(new Integer(-1)); |
| while (pos < length && pos != -1) { |
| char ch= code.charAt(pos); |
| switch (ch) { |
| case ',': |
| positions.add(new Integer(pos)); |
| break; |
| case '<': |
| pos= code.indexOf('>', pos); |
| break; |
| case '[': |
| pos= code.indexOf(']', pos); |
| break; |
| default: |
| break; |
| } |
| if (pos != -1) |
| pos++; |
| } |
| positions.add(new Integer(length)); |
| |
| int[] fields= new int[positions.size()]; |
| for (int i= 0; i < fields.length; i++) |
| fields[i]= ((Integer) positions.get(i)).intValue(); |
| return fields; |
| } |
| |
| } |
| |