--- /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; // Holds the brace pairs
+
+ protected IDocument fDocument;
+
+ protected int fOffset; // The current text position from which we search
+ protected int nPosOpening; // The position of the opening brace
+ protected int nPosClosing; // The position of the closing brace
+ protected int fAnchor;
+
+ protected PHPCodeReader fReader = new PHPCodeReader();
+
+ /**
+ *
+ * @param pairs The array of opening and closing braces we need for searching the brace matching
+ */
+
+ 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
+ }
+ }
+ }
+
+ /**
+ * Try to find a matching pair of opening and closing braces
+ *
+ * @return Returns a region if a matching pair was found.
+ */
+
+ public IRegion match (IDocument document, int offset) {
+ fOffset = offset;
+
+ if (fOffset < 0) {
+ return null;
+ }
+
+ fDocument = document;
+
+ if (matchPairsAt ()) { // If we found a pair of opening and closing braces
+ return new Region (nPosOpening, nPosClosing - nPosOpening + 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;
+ }
+ }
+
+ /**
+ * Take the character from the current text position, checks for opening or closing braces and search for
+ * the corresponding opening or closing brace
+ *
+ * @return True if a pair was found
+ */
+ protected boolean matchPairsAt() {
+ int i;
+ int nIndexOpen = fPairs.length; // Opening index
+ int nIndexClose = fPairs.length;
+ char cCurrentChar; // The character from the current text position
+ char cPrevChar; // The character from the previouis text position, just
+ // for the case the user pointed the cursor after the opening or closing brace
+
+ nPosOpening = -1;
+ nPosClosing = -1;
+
+ // get the chars preceding and following the start position
+ try {
+ cCurrentChar = fDocument.getChar (fOffset);
+ cPrevChar = fDocument.getChar (Math.max (fOffset - 1, 0));
+
+ // search for opening peer character next to the activation point
+ for (i = 0; i < fPairs.length; i = i + 2) { // The opening brace is on even indexes
+ if (cCurrentChar == fPairs[i]) { // If the current character matches an opening brace
+ nPosOpening = fOffset; // Remember the character position
+ nIndexOpen = i; // and remember the opening brace for which we search the closing one
+ }
+ else if (cPrevChar == fPairs[i]) { // If the current character is not an opening, but the previous character is an opening brace
+ nPosOpening = fOffset - 1; // Remember the character position
+ nIndexOpen = i; // and remember the opening brace for which we search the closing one
+ }
+ }
+
+ // search for closing peer character next to the activation point
+
+ if (nPosOpening < 0) { // If we didn't find an opening brace
+ for (i = 1; i < fPairs.length; i = i + 2) { // The closing brace is on odd indexes
+ if (cCurrentChar == fPairs[i]) { // If the current character matches an closing brace
+ nPosClosing = fOffset; // Remember the character position
+ nIndexClose = i; // and remember the opening brace for which we search the closing one
+ }
+ else if (cPrevChar == fPairs[i]) { // If the current character is not an opening, but the previous character is an opening brace
+ nPosClosing = fOffset - 1; // Remember the character position
+ nIndexClose = i; // and remember the opening brace for which we search the closing one
+ }
+ }
+ }
+
+ if (nPosClosing > -1) { // If we found a closing brace on current position (or before)
+ fAnchor = RIGHT;
+ nPosOpening = searchForOpeningPeer (nPosClosing, fPairs[nIndexClose - 1], fPairs[nIndexClose], fDocument);
+
+ return (nPosOpening > -1); // If we found a opening brace, return true
+ }
+ else if (nPosOpening > -1) { // If we found a opening brace on current position (or before)
+ fAnchor = LEFT;
+ nPosClosing = searchForClosingPeer (nPosOpening, fPairs[nIndexOpen], fPairs[nIndexOpen + 1], fDocument);
+
+ return (nPosClosing > -1); // If we found an closing brace for this opening brace return true
+ }
+ }
+ catch (BadLocationException x) {
+ }
+ catch (IOException x) {
+ }
+
+ return false;
+ }
+
+ /**
+ *
+ * @param offset The search start position
+ * @param openingPeer The opening brace we had found
+ * @param closingPeer The closing brace we search for
+ * @param document The document we currently are in
+ *
+ * @return
+ *
+ * @throws IOException
+ */
+ protected int searchForClosingPeer (int offset, char openingPeer,
+ char closingPeer, IDocument document) throws IOException {
+ fReader.configureForwardReader (document, offset + 1, document.getLength(), true, true);
+
+ int stack = 1; // As we have already the opening brace
+ int c = fReader.read (); // Read character on position one after the opening brace
+
+ while (c != PHPCodeReader.EOF) { // As long as we are not at the end
+ if ((c == openingPeer) && // If character is opening brace again
+ (c != closingPeer)) { // and not a closing brace (how could it be?)
+ stack++; // put it on stack
+ }
+ else if (c == closingPeer) { // If it's a closing brace
+ stack--; // Decrement level counter
+ }
+
+ if (stack == 0) { // If we found the matching closing brace
+ return fReader.getOffset (); // return the position of this closing brace
+ }
+
+ c = fReader.read (); // Read the next character
+ }
+
+ return -1;
+ }
+
+ /**
+ *
+ * @param offset The search start position
+ * @param openingPeer The opening brace we search for
+ * @param closingPeer The closing brace we search for
+ * @param document The document we currently are in
+ *
+ * @return
+ *
+ * @throws IOException
+ */
+ protected int searchForOpeningPeer (int offset, char openingPeer,
+ char closingPeer, IDocument document) throws IOException {
+ fReader.configureBackwardReader (document, offset, true, true);
+
+ int stack = 1; // As we have already the opening brace
+ int c = fReader.read (); // Read character on position one before the closing brace
+
+ while (c != PHPCodeReader.EOF) { // As long as we are not at the start of text
+ if ((c == closingPeer) && // If character is closing brace again
+ (c != openingPeer)) { // and not a opening brace (how could it be?)
+ stack++; // put it on stack
+ }
+ else if (c == openingPeer) { // If it's a opening brace
+ stack--; // Decrement level counter
+ }
+
+ if (stack == 0) { // If we found the matching closing brace
+ return fReader.getOffset (); // return the position of this closing brace
+ }
+
+ c = fReader.read (); // Read the previous character
+ }
+
+ return -1;
+ }
+}
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