--- /dev/null
+package net.sourceforge.phpdt.internal.ui.text;
+
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved.
+ */
+
+import java.io.IOException;
+
+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.source.ICharacterPairMatcher;
+
+/**
+ * Helper class for match pairs of characters.
+ */
+public class PHPPairMatcher implements ICharacterPairMatcher {
+ protected char[] fPairs;
+
+ protected IDocument fDocument;
+
+ protected int fOffset;
+
+ protected int fStartPos;
+
+ protected int fEndPos;
+
+ protected int fAnchor;
+
+ protected PHPCodeReader fReader = new PHPCodeReader();
+
+ public PHPPairMatcher(char[] pairs) {
+ fPairs = pairs;
+ }
+
+ /*
+ * @see org.eclipse.jface.text.source.ICharacterPairMatcher#clear()
+ */
+ public void clear() {
+ if (fReader != null) {
+ try {
+ fReader.close();
+ } catch (IOException x) {
+ // ignore
+ }
+ }
+ }
+
+ public IRegion match(IDocument document, int offset) {
+
+ fOffset = offset;
+
+ if (fOffset < 0)
+ return null;
+
+ fDocument = document;
+
+ if (matchPairsAt() && fStartPos != fEndPos)
+ return new Region(fStartPos, fEndPos - fStartPos + 1);
+
+ return null;
+ }
+
+ public int getAnchor() {
+ return fAnchor;
+ }
+
+ public void dispose() {
+ fDocument = null;
+ if (fReader != null) {
+ try {
+ fReader.close();
+ } catch (IOException x) {
+ // ignore
+ }
+ fReader = null;
+ }
+ }
+
+ protected boolean matchPairsAt() {
+
+ int i;
+ int pairIndex1 = fPairs.length;
+ int pairIndex2 = fPairs.length;
+
+ fStartPos = -1;
+ fEndPos = -1;
+
+ // get the chars preceding and following the start position
+ try {
+
+ char prevChar = fDocument.getChar(Math.max(fOffset - 1, 0));
+ char nextChar = fDocument.getChar(fOffset);
+
+ // search for opening peer character next to the activation point
+ for (i = 0; i < fPairs.length; i = i + 2) {
+ if (nextChar == fPairs[i]) {
+ fStartPos = fOffset;
+ pairIndex1 = i;
+ } else 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;
+ } else if (nextChar == fPairs[i]) {
+ fEndPos = fOffset;
+ 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) {
+ } catch (IOException x) {
+ }
+
+ return false;
+ }
+
+ protected int searchForClosingPeer(int offset, int openingPeer,
+ int closingPeer, IDocument document) throws IOException {
+
+ fReader.configureForwardReader(document, offset + 1, document
+ .getLength(), true, true);
+
+ int stack = 1;
+ int c = fReader.read();
+ while (c != PHPCodeReader.EOF) {
+ if (c == openingPeer && c != closingPeer)
+ stack++;
+ else if (c == closingPeer)
+ stack--;
+
+ if (stack == 0)
+ return fReader.getOffset();
+
+ c = fReader.read();
+ }
+
+ return -1;
+ }
+
+ protected int searchForOpeningPeer(int offset, int openingPeer,
+ int closingPeer, IDocument document) throws IOException {
+
+ fReader.configureBackwardReader(document, offset, true, true);
+
+ int stack = 1;
+ int c = fReader.read();
+ while (c != PHPCodeReader.EOF) {
+ if (c == closingPeer && c != openingPeer)
+ stack++;
+ else if (c == openingPeer)
+ stack--;
+
+ if (stack == 0)
+ return fReader.getOffset();
+
+ c = fReader.read();
+ }
+
+ return -1;
+ }
+}
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