/*
* [The "BSD license"]
* Copyright (c) 2012 Terence Parr
* Copyright (c) 2012 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package org.antlr.v4.codegen.model;
import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.runtime.atn.DecisionState;
import org.antlr.v4.runtime.misc.IntervalSet;
import org.antlr.v4.tool.ast.GrammarAST;
import java.util.List;
/** (A B C)? */
public class LL1OptionalBlockSingleAlt extends LL1Choice {
@ModelElement public SrcOp expr;
@ModelElement public List<SrcOp> followExpr; // might not work in template if size>1
public LL1OptionalBlockSingleAlt(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 = LinearApproximator.getLL1LookaheadSets(dfa);
IntervalSet[] altLookSets = factory.getGrammar().decisionLOOK.get(decision);
altLook = getAltLookaheadAsStringLists(altLookSets);
IntervalSet look = altLookSets[0];
IntervalSet followLook = altLookSets[1];
IntervalSet expecting = look.or(followLook);
this.error = getThrowNoViableAlt(factory, blkAST, expecting);
expr = addCodeForLookaheadTempVar(look);
followExpr = factory.getLL1Test(followLook, blkAST);
}
}