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32 lines
998 B
32 lines
998 B
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/BlockContext.java#2 $ |
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*/ |
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/**BlockContext stores the information needed when creating an |
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* alternative (list of elements). Entering a subrule requires |
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* that we save this state as each block of alternatives |
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* requires state such as "tail of current alternative." |
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*/ |
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class BlockContext { |
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AlternativeBlock block; // current block of alternatives |
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int altNum; // which alt are we accepting 0..n-1 |
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BlockEndElement blockEnd; // used if nested |
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public void addAlternativeElement(AlternativeElement e) { |
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currentAlt().addElement(e); |
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} |
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public Alternative currentAlt() { |
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return (Alternative)block.alternatives.elementAt(altNum); |
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} |
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public AlternativeElement currentElement() { |
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return currentAlt().tail; |
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} |
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}
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