persistence.antlr.BlockContext Maven / Gradle / Ivy
package persistence.antlr;
/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
*/
/**BlockContext stores the information needed when creating an
* alternative (list of elements). Entering a subrule requires
* that we save this state as each block of alternatives
* requires state such as "tail of current alternative."
*/
class BlockContext {
AlternativeBlock block; // current block of alternatives
int altNum; // which alt are we accepting 0..n-1
BlockEndElement blockEnd; // used if nested
public void addAlternativeElement(AlternativeElement e) {
currentAlt().addElement(e);
}
public Alternative currentAlt() {
return (Alternative)block.alternatives.elementAt(altNum);
}
public AlternativeElement currentElement() {
return currentAlt().tail;
}
}