| /******************************************************************************* |
| * Copyright (c) 2004 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.jst.jsp.ui.internal.contentassist; |
| |
| 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.swt.SWT; |
| import org.eclipse.swt.custom.StyleRange; |
| |
| |
| /** |
| * @plannedfor 1.0 |
| */ |
| public class JavaParameterListValidator implements IContextInformationValidator, IContextInformationPresenter { |
| |
| private int fPosition; |
| private ITextViewer fViewer; |
| private IContextInformation fInformation; |
| |
| private int fCurrentParameter; |
| |
| /** |
| * @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, int start, int end, char increment, char decrement, boolean considerNesting) throws BadLocationException { |
| |
| Assert.isTrue((increment != 0 || decrement != 0) && increment != decrement); |
| |
| int nestingLevel= 0; |
| int charCount= 0; |
| while (start < end) { |
| char curr= document.getChar(start++); |
| switch (curr) { |
| case '/': |
| if (start < end) { |
| char next= document.getChar(start); |
| if (next == '*') { |
| // a comment starts, advance to the comment end |
| start= getCommentEnd(document, start + 1, end); |
| } else if (next == '/') { |
| // '//'-comment: nothing to do anymore on this line |
| start= end; |
| } |
| } |
| break; |
| case '*': |
| if (start < end) { |
| char next= document.getChar(start); |
| if (next == '/') { |
| // we have been in a comment: forget what we read before |
| charCount= 0; |
| ++ start; |
| } |
| } |
| break; |
| case '"': |
| case '\'': |
| start= getStringEnd(document, start, end, curr); |
| break; |
| default: |
| |
| if (considerNesting) { |
| |
| if ('(' == curr) |
| ++ nestingLevel; |
| else if (')' == curr) |
| -- nestingLevel; |
| |
| if (nestingLevel != 0) |
| break; |
| } |
| |
| if (increment != 0) { |
| if (curr == increment) |
| ++ charCount; |
| } |
| |
| if (decrement != 0) { |
| if (curr == decrement) |
| -- charCount; |
| } |
| } |
| } |
| |
| return charCount; |
| } |
| |
| /** |
| * @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); |
| |
| } 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, ',', (char) 0, true); |
| } catch (BadLocationException x) { |
| return false; |
| } |
| |
| if (fCurrentParameter != -1) { |
| if (currentParameter == fCurrentParameter) |
| return false; |
| } |
| |
| presentation.clear(); |
| fCurrentParameter= currentParameter; |
| |
| String s= fInformation.getInformationDisplayString(); |
| int start= 0; |
| int occurrences= 0; |
| while (occurrences < fCurrentParameter) { |
| int found= s.indexOf(',', start); |
| if (found == -1) |
| break; |
| start= found + 1; |
| ++ occurrences; |
| } |
| |
| if (occurrences < fCurrentParameter) { |
| presentation.addStyleRange(new StyleRange(0, s.length(), null, null, SWT.NORMAL)); |
| return true; |
| } |
| |
| if (start == -1) |
| start= 0; |
| |
| int end= s.indexOf(',', start); |
| if (end == -1) |
| end= s.length(); |
| |
| 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; |
| } |
| } |