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

diff --git a/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/SubstitutionTextReader.java b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/SubstitutionTextReader.java
new file mode 100644
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+++ b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/SubstitutionTextReader.java
@@ -0,0 +1,155 @@
+/**********************************************************************
+ Copyright (c) 2000, 2002 IBM Corp. and others.
+ All rights reserved. This program and the accompanying materials
+ are made available under the terms of the Common Public License v1.0
+ which accompanies this distribution, and is available at
+ http://www.eclipse.org/legal/cpl-v10.html
+
+ Contributors:
+ IBM Corporation - Initial implementation
+ **********************************************************************/
+
+package net.sourceforge.phpdt.internal.ui.text;
+
+import java.io.IOException;
+import java.io.Reader;
+
+import net.sourceforge.phpdt.internal.corext.phpdoc.SingleCharReader;
+
+/**
+ * Reads the text contents from a reader and computes for each character a
+ * potential substitution. The substitution may eat more characters than only
+ * the one passed into the computation routine.
+ */
+public abstract class SubstitutionTextReader extends SingleCharReader {
+
+	protected static final String LINE_DELIM = System.getProperty(
+			"line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
+
+	private Reader fReader;
+
+	private boolean fWasWhiteSpace;
+
+	private int fCharAfterWhiteSpace;
+
+	/**
+	 * Tells whether white space characters are skipped.
+	 */
+	private boolean fSkipWhiteSpace = true;
+
+	private boolean fReadFromBuffer;
+
+	private StringBuffer fBuffer;
+
+	private int fIndex;
+
+	protected SubstitutionTextReader(Reader reader) {
+		fReader = reader;
+		fBuffer = new StringBuffer();
+		fIndex = 0;
+		fReadFromBuffer = false;
+		fCharAfterWhiteSpace = -1;
+		fWasWhiteSpace = true;
+	}
+
+	/**
+	 * Implement to compute the substitution for the given character and if
+	 * necessary subsequent characters. Use <code>nextChar</code> to read
+	 * subsequent characters.
+	 */
+	protected abstract String computeSubstitution(int c) throws IOException;
+
+	/**
+	 * Returns the internal reader.
+	 */
+	protected Reader getReader() {
+		return fReader;
+	}
+
+	/**
+	 * Returns the next character.
+	 */
+	protected int nextChar() throws IOException {
+		fReadFromBuffer = (fBuffer.length() > 0);
+		if (fReadFromBuffer) {
+			char ch = fBuffer.charAt(fIndex++);
+			if (fIndex >= fBuffer.length()) {
+				fBuffer.setLength(0);
+				fIndex = 0;
+			}
+			return ch;
+		} else {
+			int ch = fCharAfterWhiteSpace;
+			if (ch == -1) {
+				ch = fReader.read();
+			}
+			if (fSkipWhiteSpace && Character.isWhitespace((char) ch)) {
+				do {
+					ch = fReader.read();
+				} while (Character.isWhitespace((char) ch));
+				if (ch != -1) {
+					fCharAfterWhiteSpace = ch;
+					return ' ';
+				}
+			} else {
+				fCharAfterWhiteSpace = -1;
+			}
+			return ch;
+		}
+	}
+
+	/**
+	 * @see Reader#read()
+	 */
+	public int read() throws IOException {
+		int c;
+		do {
+
+			c = nextChar();
+			while (!fReadFromBuffer) {
+				String s = computeSubstitution(c);
+				if (s == null)
+					break;
+				if (s.length() > 0)
+					fBuffer.insert(0, s);
+				c = nextChar();
+			}
+
+		} while (fSkipWhiteSpace && fWasWhiteSpace && (c == ' '));
+		fWasWhiteSpace = (c == ' ' || c == '\r' || c == '\n');
+		return c;
+	}
+
+	/**
+	 * @see Reader#ready()
+	 */
+	public boolean ready() throws IOException {
+		return fReader.ready();
+	}
+
+	/**
+	 * @see Reader#close()
+	 */
+	public void close() throws IOException {
+		fReader.close();
+	}
+
+	/**
+	 * @see Reader#reset()
+	 */
+	public void reset() throws IOException {
+		fReader.reset();
+		fWasWhiteSpace = true;
+		fCharAfterWhiteSpace = -1;
+		fBuffer.setLength(0);
+		fIndex = 0;
+	}
+
+	protected final void setSkipWhitespace(boolean state) {
+		fSkipWhiteSpace = state;
+	}
+
+	protected final boolean isSkippingWhitespace() {
+		return fSkipWhiteSpace;
+	}
+}
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