--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2011 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.core.runtime.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
+ int nextLine= document.getLineOfOffset(offset) + 1;
+ if (nextLine == document.getNumberOfLines())
+ offset= end;
+ else
+ offset= document.getLineOffset(nextLine);
+ }
+ }
+ 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;
+ }
+ //$FALL-THROUGH$
+ case ']':
+ if (considerNesting) {
+ if (nestingMode == BRACKET)
+ if (--nestingLevel == 0)
+ nestingMode= NONE;
+ break;
+ }
+ //$FALL-THROUGH$
+ case '(':
+ if (considerNesting) {
+ if (nestingMode == ANGLE) {
+ // generics heuristic failed
+ nestingMode=PAREN;
+ nestingLevel= 1;
+ }
+ if (nestingMode == PAREN || nestingMode == NONE) {
+ nestingMode= PAREN;
+ nestingLevel++;
+ }
+ break;
+ }
+ //$FALL-THROUGH$
+ case ')':
+ if (considerNesting) {
+ if (nestingMode == PAREN)
+ if (--nestingLevel == 0)
+ nestingMode= NONE;
+ break;
+ }
+ //$FALL-THROUGH$
+ case '{':
+ if (considerNesting) {
+ if (nestingMode == ANGLE) {
+ // generics heuristic failed
+ nestingMode=BRACE;
+ nestingLevel= 1;
+ }
+ if (nestingMode == BRACE || nestingMode == NONE) {
+ nestingMode= BRACE;
+ nestingLevel++;
+ }
+ break;
+ }
+ //$FALL-THROUGH$
+ case '}':
+ if (considerNesting) {
+ if (nestingMode == BRACE)
+ if (--nestingLevel == 0)
+ nestingMode= NONE;
+ break;
+ }
+ //$FALL-THROUGH$
+ case '<':
+ if (considerNesting) {
+ if (nestingMode == ANGLE || nestingMode == NONE && checkGenericsHeuristic(document, offset - 1, start - 1)) {
+ nestingMode= ANGLE;
+ nestingLevel++;
+ }
+ break;
+ }
+ //$FALL-THROUGH$
+ case '>':
+ if (considerNesting) {
+ if (nestingMode == ANGLE)
+ if (--nestingLevel == 0)
+ nestingMode= NONE;
+ break;
+ }
+ //$FALL-THROUGH$
+ 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) {
+ 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<Integer> positions= new ArrayList<Integer>();
+ 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]= positions.get(i).intValue();
+ return fields;
+ }
+
+}
+
git://git.uio.no / ifi-stolz-refaktor.git / blobdiff