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Java Lookahead Parser Generator. Generator produces LALR(k) parsers. Grammar rules are entered using annotations. Rule annotation can be attached to reducer method, which keeps rule and it's action together.

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package org.vesalainen.parser;

public enum Trace
{
    INPUT,
    SHIFT,
    SHRD,
    GOTO,
    GTRD,
    BEFOREREDUCE,
    AFTERREDUCE,
    LASHIFT,
    LAREDUCE,
    REDUCEACT,
    SHIFTACT,
    SHIFTREDUCEACT,
    LAINPUT,
    PUSHVALUE,
    GOTOLA2LR,
    EXITLA, LASHRD, STATE}