X-Git-Url: http://secure.phpeclipse.com

diff --git a/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/java/JavaParameterListValidator.java b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/java/JavaParameterListValidator.java
new file mode 100644
index 0000000..71bf6ff
--- /dev/null
+++ b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/java/JavaParameterListValidator.java
@@ -0,0 +1,232 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 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 net.sourceforge.phpdt.internal.ui.text.java;
+
+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;
+
+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, int start, int end,
+			String increments, String decrements, boolean considerNesting)
+			throws BadLocationException {
+
+		Assert.isTrue((increments.length() != 0 || decrements.length() != 0)
+				&& !increments.equals(decrements));
+
+		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 (increments.indexOf(curr) >= 0) {
+					++charCount;
+				}
+
+				if (decrements.indexOf(curr) >= 0) {
+					--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; //$NON-NLS-1$//$NON-NLS-2$
+
+		} 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 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;
+	}
+}