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33 lines
998 B
33 lines
998 B
5 years ago
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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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