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ByteBuffer.java
Package: antlr-2_7_0.zip [view]
Upload User: afrynkmhm
Upload Date: 2007-01-06
Package Size: 1262k
Code Size: 2k
Category:
Compiler program
Development Platform:
Others
- package antlr;
- /* ANTLR Translator Generator
- * Project led by Terence Parr at http://www.jGuru.com
- * Software rights: http://www.antlr.org/RIGHTS.html
- *
- * $Id: //depot/code/org.antlr/release/antlr-2.7.0/antlr/ByteBuffer.java#1 $
- */
- /**A Stream of characters fed to the lexer from a InputStream that can
- * be rewound via mark()/rewind() methods.
- * <p>
- * A dynamic array is used to buffer up all the input characters. Normally,
- * "k" characters are stored in the buffer. More characters may be stored during
- * guess mode (testing syntactic predicate), or when LT(i>k) is referenced.
- * Consumption of characters is deferred. In other words, reading the next
- * character is not done by conume(), but deferred until needed by LA or LT.
- * <p>
- *
- * @see antlr.CharQueue
- */
- // SAS: added this class to handle Binary input w/ FileInputStream
- import java.io.InputStream;
- import java.io.IOException;
- public class ByteBuffer extends InputBuffer{
- // char source
- transient InputStream input;
- /** Create a character buffer */
- public ByteBuffer(InputStream input_) {
- super();
- input = input_;
- }
- /** Ensure that the character buffer is sufficiently full */
- public void fill(int amount) throws CharStreamException {
- try {
- syncConsume();
- // Fill the buffer sufficiently to hold needed characters
- while (queue.nbrEntries < amount + markerOffset) {
- // Append the next character
- queue.append((char) input.read());
- }
- } catch (IOException io) {
- throw new CharStreamIOException(io);
- }
- }
- }