Package org.antlr.v4.codegen.model

Source Code of org.antlr.v4.codegen.model.LL1StarBlockSingleAlt

/*
* [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,
*  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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*  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package org.antlr.v4.codegen.model;

import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.runtime.atn.StarLoopEntryState;
import org.antlr.v4.runtime.misc.IntervalSet;
import org.antlr.v4.tool.ast.GrammarAST;

import java.util.List;

/** */
public class LL1StarBlockSingleAlt extends LL1Loop {
  public LL1StarBlockSingleAlt(OutputModelFactory factory, GrammarAST starRoot, List<CodeBlockForAlt> alts) {
    super(factory, starRoot, alts);

    StarLoopEntryState star = (StarLoopEntryState)starRoot.atnState;
    loopBackStateNumber = star.loopBackState.stateNumber;
    this.decision = star.decision;
    IntervalSet[] altLookSets = factory.getGrammar().decisionLOOK.get(decision);
    assert altLookSets.length == 2;
    IntervalSet enterLook = altLookSets[0];
    IntervalSet exitLook = altLookSets[1];
    loopExpr = addCodeForLoopLookaheadTempVar(enterLook);
  }
}
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