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53 lines
1.7 KiB
53 lines
1.7 KiB
package com.fr.third.antlr; |
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/* ANTLR Translator Generator |
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* Project led by Terence Parr at http://www.cs.usfca.edu |
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* Software rights: http://www.antlr.org/license.html |
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* |
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* $Id: //depot/code/org.antlr/release/antlr-2.7.7/antlr/CharBuffer.java#2 $ |
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*/ |
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/**A Stream of characters fed to the lexer from a InputStream that can |
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* be rewound via mark()/rewind() methods. |
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* <p> |
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* A dynamic array is used to buffer up all the input characters. Normally, |
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* "k" characters are stored in the buffer. More characters may be stored during |
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* guess mode (testing syntactic predicate), or when LT(i>k) is referenced. |
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* Consumption of characters is deferred. In other words, reading the next |
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* character is not done by conume(), but deferred until needed by LA or LT. |
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* <p> |
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* |
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* @see antlr.CharQueue |
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*/ |
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import java.io.IOException; |
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import java.io.Reader; |
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// SAS: Move most functionality into InputBuffer -- just the file-specific |
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// stuff is in here |
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public class CharBuffer extends InputBuffer { |
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// char source |
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public transient Reader input; |
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/** Create a character buffer */ |
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public CharBuffer(Reader input_) { // SAS: for proper text i/o |
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super(); |
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input = input_; |
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} |
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/** Ensure that the character buffer is sufficiently full */ |
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public void fill(int amount) throws CharStreamException { |
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try { |
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syncConsume(); |
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// Fill the buffer sufficiently to hold needed characters |
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while (queue.nbrEntries < amount + markerOffset) { |
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// Append the next character |
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queue.append((char)input.read()); |
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} |
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} |
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catch (IOException io) { |
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throw new CharStreamIOException(io); |
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} |
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} |
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}
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