LL1AltBlock.java 文件源码

public LL1AltBlock(OutputModelFactory factory, GrammarAST blkAST, List<CodeBlockForAlt> alts) {
    super(factory, blkAST, alts);
    this.decision = ((DecisionState)blkAST.atnState).decision;

    /** Lookahead for each alt 1..n */
    IntervalSet[] altLookSets = factory.getGrammar().decisionLOOK.get(decision);
    altLook = getAltLookaheadAsStringLists(altLookSets);

    IntervalSet expecting = IntervalSet.or(altLookSets); // combine alt sets
    this.error = getThrowNoViableAlt(factory, blkAST, expecting);
}