| /******************************************************************************* |
| * Copyright (c) 2005 The Regents of the University of California. |
| * This material was produced under U.S. Government contract W-7405-ENG-36 |
| * for Los Alamos National Laboratory, which is operated by the University |
| * of California for the U.S. Department of Energy. The U.S. Government has |
| * rights to use, reproduce, and distribute this software. NEITHER THE |
| * GOVERNMENT NOR THE UNIVERSITY MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR |
| * ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE. If software is modified |
| * to produce derivative works, such modified software should be clearly marked, |
| * so as not to confuse it with the version available from LANL. |
| * |
| * Additionally, 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 |
| * |
| * LA-CC 04-115 |
| *******************************************************************************/ |
| package org.eclipse.ptp.internal.ui.hover; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| /** |
| * @author Clement chu |
| * |
| */ |
| public abstract class SubstitutionTextReader extends SingleCharReader { |
| protected static final String LINE_DELIM= System.getProperty("line.separator", "\n"); |
| |
| private Reader fReader; |
| protected 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; |
| |
| /** Constructor |
| * @param reader |
| */ |
| 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; |
| /** |
| * @return the internal reader. |
| */ |
| protected Reader getReader() { |
| return fReader; |
| } |
| /** |
| * @return the next character. |
| * @throws IOException |
| */ |
| 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; |
| } |
| } |
| /* (non-Javadoc) |
| * @see java.io.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; |
| } |
| /* (non-Javadoc) |
| * @see java.io.Reader#ready() |
| */ |
| public boolean ready() throws IOException { |
| return fReader.ready(); |
| } |
| /* (non-Javadoc) |
| * @see java.io.Closeable#close() |
| */ |
| public void close() throws IOException { |
| fReader.close(); |
| } |
| /* (non-Javadoc) |
| * @see java.io.Reader#reset() |
| */ |
| public void reset() throws IOException { |
| fReader.reset(); |
| fWasWhiteSpace= true; |
| fCharAfterWhiteSpace= -1; |
| fBuffer.setLength(0); |
| fIndex= 0; |
| } |
| /** Set skip white space |
| * @param state |
| */ |
| protected final void setSkipWhitespace(boolean state) { |
| fSkipWhiteSpace= state; |
| } |
| /** Is skip white space |
| * @return |
| */ |
| protected final boolean isSkippingWhitespace() { |
| return fSkipWhiteSpace; |
| } |
| } |