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

diff --git a/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/PHPCodeReader.java b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/PHPCodeReader.java
new file mode 100644
index 0000000..fffffda
--- /dev/null
+++ b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/PHPCodeReader.java
@@ -0,0 +1,256 @@
+package net.sourceforge.phpdt.internal.ui.text;
+
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved.
+ */
+
+import java.io.IOException;
+
+import net.sourceforge.phpdt.internal.corext.phpdoc.SingleCharReader;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+
+/**
+ * Reads from a document either forwards or backwards. May be configured to skip
+ * comments and strings.
+ */
+public class PHPCodeReader extends SingleCharReader {
+
+	/** The EOF character */
+	public static final int EOF = -1;
+
+	private boolean fSkipComments = false;
+
+	private boolean fSkipStrings = false;
+
+	private boolean fForward = false;
+
+	private IDocument fDocument;
+
+	private int fOffset;
+
+	private int fEnd = -1;
+
+	private int fCachedLineNumber = -1;
+
+	private int fCachedLineOffset = -1;
+
+	public PHPCodeReader() {
+	}
+
+	/**
+	 * Returns the offset of the last read character. Should only be called
+	 * after read has been called.
+	 */
+	public int getOffset() {
+		return fForward ? fOffset - 1 : fOffset;
+	}
+
+	public void configureForwardReader(IDocument document, int offset,
+			int length, boolean skipComments, boolean skipStrings)
+			throws IOException {
+		fDocument = document;
+		fOffset = offset;
+		fSkipComments = skipComments;
+		fSkipStrings = skipStrings;
+
+		fForward = true;
+		fEnd = Math.min(fDocument.getLength(), fOffset + length);
+	}
+
+	public void configureBackwardReader(IDocument document, int offset,
+			boolean skipComments, boolean skipStrings) throws IOException {
+		fDocument = document;
+		fOffset = offset;
+		fSkipComments = skipComments;
+		fSkipStrings = skipStrings;
+
+		fForward = false;
+		try {
+			fCachedLineNumber = fDocument.getLineOfOffset(fOffset);
+		} catch (BadLocationException x) {
+			throw new IOException(x.getMessage());
+		}
+	}
+
+	/*
+	 * @see Reader#close()
+	 */
+	public void close() throws IOException {
+		fDocument = null;
+	}
+
+	/*
+	 * @see SingleCharReader#read()
+	 */
+	public int read() throws IOException {
+		try {
+			return fForward ? readForwards() : readBackwards();
+		} catch (BadLocationException x) {
+			throw new IOException(x.getMessage());
+		}
+	}
+
+	private void gotoCommentEnd() throws BadLocationException {
+		while (fOffset < fEnd) {
+			char current = fDocument.getChar(fOffset++);
+			if (current == '*') {
+				if (fOffset < fEnd && fDocument.getChar(fOffset) == '/') {
+					++fOffset;
+					return;
+				}
+			}
+		}
+	}
+
+	private void gotoStringEnd(char delimiter) throws BadLocationException {
+		while (fOffset < fEnd) {
+			char current = fDocument.getChar(fOffset++);
+			if (current == '\\') {
+				// ignore escaped characters
+				++fOffset;
+			} else if (current == delimiter) {
+				return;
+			}
+		}
+	}
+
+	private void gotoLineEnd() throws BadLocationException {
+		int line = fDocument.getLineOfOffset(fOffset);
+		fOffset = fDocument.getLineOffset(line + 1);
+	}
+
+	private int readForwards() throws BadLocationException {
+		while (fOffset < fEnd) {
+			char current = fDocument.getChar(fOffset++);
+
+			switch (current) {
+			case '"':
+			case '\'':
+
+				if (fSkipStrings) {
+					gotoStringEnd(current);
+					continue;
+				}
+
+				return current;
+			case '#':
+
+				if (fSkipComments && fOffset < fEnd) {
+					gotoLineEnd();
+					continue;
+				}
+
+				return current;
+
+			case '/':
+
+				if (fSkipComments && fOffset < fEnd) {
+					char next = fDocument.getChar(fOffset);
+					if (next == '*') {
+						// a comment starts, advance to the comment end
+						++fOffset;
+						gotoCommentEnd();
+						continue;
+					} else if (next == '/') {
+						// '//'-comment starts, advance to the line end
+						gotoLineEnd();
+						continue;
+					}
+				}
+
+				return current;
+
+			}
+
+			return current;
+		}
+
+		return EOF;
+	}
+
+	private void handleSingleLineComment() throws BadLocationException {
+		int line = fDocument.getLineOfOffset(fOffset);
+		if (line < fCachedLineNumber) {
+			fCachedLineNumber = line;
+			fCachedLineOffset = fDocument.getLineOffset(line);
+			int offset = fOffset;
+			while (fCachedLineOffset < offset) {
+				char current = fDocument.getChar(offset--);
+
+				if (current == '/' && fCachedLineOffset <= offset
+						&& fDocument.getChar(offset) == '/') {
+					fOffset = offset;
+					return;
+				}
+
+				if (current == '#' && fCachedLineOffset <= offset) {
+					fOffset = offset;
+					return;
+				}
+			}
+		}
+	}
+
+	private void gotoCommentStart() throws BadLocationException {
+		while (0 < fOffset) {
+			char current = fDocument.getChar(fOffset--);
+			if (current == '*' && 0 <= fOffset
+					&& fDocument.getChar(fOffset) == '/')
+				return;
+		}
+	}
+
+	private void gotoStringStart(char delimiter) throws BadLocationException {
+		while (0 < fOffset) {
+			char current = fDocument.getChar(fOffset);
+			if (current == delimiter) {
+				if (!(0 <= fOffset && fDocument.getChar(fOffset - 1) == '\\'))
+					return;
+			}
+			--fOffset;
+		}
+	}
+
+	private int readBackwards() throws BadLocationException {
+
+		while (0 < fOffset) {
+			--fOffset;
+
+			handleSingleLineComment();
+
+			char current = fDocument.getChar(fOffset);
+			switch (current) {
+			case '/':
+
+				if (fSkipComments && fOffset > 1) {
+					char next = fDocument.getChar(fOffset - 1);
+					if (next == '*') {
+						// a comment ends, advance to the comment start
+						fOffset -= 2;
+						gotoCommentStart();
+						continue;
+					}
+				}
+
+				return current;
+			case '"':
+			case '\'':
+
+				if (fSkipStrings) {
+					--fOffset;
+					gotoStringStart(current);
+					continue;
+				}
+
+				return current;
+			}
+
+			return current;
+		}
+
+		return EOF;
+	}
+}