/*
* [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
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* 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.codegen.model.decl.Decl;
import org.antlr.v4.codegen.model.decl.TokenTypeDecl;
import org.antlr.v4.misc.Utils;
import org.antlr.v4.runtime.misc.IntervalSet;
import org.antlr.v4.tool.ast.GrammarAST;
import java.util.ArrayList;
import java.util.List;
/** The class hierarchy underneath SrcOp is pretty deep but makes sense that,
* for example LL1StarBlock is a kind of LL1Loop which is a kind of Choice.
* The problem is it's impossible to figure
* out how to construct one of these deeply nested objects because of the
* long super constructor call chain. Instead, I decided to in-line all of
* this and then look for opportunities to re-factor code into functions.
* It makes sense to use a class hierarchy to share data fields, but I don't
* think it makes sense to factor code using super constructors because
* it has too much work to do.
*/
public abstract class Choice extends RuleElement {
public int decision = -1;
public Decl label;
@ModelElement public List<CodeBlockForAlt> alts;
@ModelElement public List<SrcOp> preamble = new ArrayList<SrcOp>();
public Choice(OutputModelFactory factory,
GrammarAST blkOrEbnfRootAST,
List<CodeBlockForAlt> alts)
{
super(factory, blkOrEbnfRootAST);
this.alts = alts;
}
public void addPreambleOp(SrcOp op) {
preamble.add(op);
}
public List<String[]> getAltLookaheadAsStringLists(IntervalSet[] altLookSets) {
List<String[]> altLook = new ArrayList<String[]>();
for (IntervalSet s : altLookSets) {
altLook.add(factory.getGenerator().getTarget().getTokenTypesAsTargetLabels(factory.getGrammar(), s.toArray()));
}
return altLook;
}
public TestSetInline addCodeForLookaheadTempVar(IntervalSet look) {
List<SrcOp> testOps = factory.getLL1Test(look, ast);
TestSetInline expr = Utils.find(testOps, TestSetInline.class);
if (expr != null) {
Decl d = new TokenTypeDecl(factory, expr.varName);
factory.getCurrentRuleFunction().addLocalDecl(d);
CaptureNextTokenType nextType = new CaptureNextTokenType(factory,expr.varName);
addPreambleOp(nextType);
}
return expr;
}
public ThrowNoViableAlt getThrowNoViableAlt(OutputModelFactory factory,
GrammarAST blkAST,
IntervalSet expecting) {
return new ThrowNoViableAlt(factory, blkAST, expecting);
}
}