mirror of
https://github.com/marcin-szczepanski/jFuzzyLogic.git
synced 2024-08-16 18:06:57 +02:00
191 lines
7.5 KiB
Java
191 lines
7.5 KiB
Java
![]() |
/*
|
||
|
[The "BSD licence"]
|
||
|
Copyright (c) 2005-2006 Terence Parr
|
||
|
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.codegen;
|
||
|
|
||
|
import org.antlr.analysis.*;
|
||
|
import org.antlr.misc.Utils;
|
||
|
import org.antlr.stringtemplate.StringTemplate;
|
||
|
import org.antlr.stringtemplate.StringTemplateGroup;
|
||
|
|
||
|
import java.util.List;
|
||
|
|
||
|
public class ACyclicDFACodeGenerator {
|
||
|
protected CodeGenerator parentGenerator;
|
||
|
|
||
|
public ACyclicDFACodeGenerator(CodeGenerator parent) {
|
||
|
this.parentGenerator = parent;
|
||
|
}
|
||
|
|
||
|
public StringTemplate genFixedLookaheadDecision(StringTemplateGroup templates,
|
||
|
DFA dfa)
|
||
|
{
|
||
|
return walkFixedDFAGeneratingStateMachine(templates, dfa, dfa.startState, 1);
|
||
|
}
|
||
|
|
||
|
protected StringTemplate walkFixedDFAGeneratingStateMachine(
|
||
|
StringTemplateGroup templates,
|
||
|
DFA dfa,
|
||
|
DFAState s,
|
||
|
int k)
|
||
|
{
|
||
|
//System.out.println("walk "+s.stateNumber+" in dfa for decision "+dfa.decisionNumber);
|
||
|
if ( s.isAcceptState() ) {
|
||
|
StringTemplate dfaST = templates.getInstanceOf("dfaAcceptState");
|
||
|
dfaST.setAttribute("alt", Utils.integer(s.getUniquelyPredictedAlt()));
|
||
|
return dfaST;
|
||
|
}
|
||
|
|
||
|
// the default templates for generating a state and its edges
|
||
|
// can be an if-then-else structure or a switch
|
||
|
String dfaStateName = "dfaState";
|
||
|
String dfaLoopbackStateName = "dfaLoopbackState";
|
||
|
String dfaOptionalBlockStateName = "dfaOptionalBlockState";
|
||
|
String dfaEdgeName = "dfaEdge";
|
||
|
if ( parentGenerator.canGenerateSwitch(s) ) {
|
||
|
dfaStateName = "dfaStateSwitch";
|
||
|
dfaLoopbackStateName = "dfaLoopbackStateSwitch";
|
||
|
dfaOptionalBlockStateName = "dfaOptionalBlockStateSwitch";
|
||
|
dfaEdgeName = "dfaEdgeSwitch";
|
||
|
}
|
||
|
|
||
|
StringTemplate dfaST = templates.getInstanceOf(dfaStateName);
|
||
|
if ( dfa.getNFADecisionStartState().decisionStateType==NFAState.LOOPBACK ) {
|
||
|
dfaST = templates.getInstanceOf(dfaLoopbackStateName);
|
||
|
}
|
||
|
else if ( dfa.getNFADecisionStartState().decisionStateType==NFAState.OPTIONAL_BLOCK_START ) {
|
||
|
dfaST = templates.getInstanceOf(dfaOptionalBlockStateName);
|
||
|
}
|
||
|
dfaST.setAttribute("k", Utils.integer(k));
|
||
|
dfaST.setAttribute("stateNumber", Utils.integer(s.stateNumber));
|
||
|
dfaST.setAttribute("semPredState",
|
||
|
Boolean.valueOf(s.isResolvedWithPredicates()));
|
||
|
/*
|
||
|
String description = dfa.getNFADecisionStartState().getDescription();
|
||
|
description = parentGenerator.target.getTargetStringLiteralFromString(description);
|
||
|
//System.out.println("DFA: "+description+" associated with AST "+dfa.getNFADecisionStartState());
|
||
|
if ( description!=null ) {
|
||
|
dfaST.setAttribute("description", description);
|
||
|
}
|
||
|
*/
|
||
|
int EOTPredicts = NFA.INVALID_ALT_NUMBER;
|
||
|
DFAState EOTTarget = null;
|
||
|
//System.out.println("DFA state "+s.stateNumber);
|
||
|
for (int i = 0; i < s.getNumberOfTransitions(); i++) {
|
||
|
Transition edge = (Transition) s.transition(i);
|
||
|
//System.out.println("edge "+s.stateNumber+"-"+edge.label.toString()+"->"+edge.target.stateNumber);
|
||
|
if ( edge.label.getAtom()==Label.EOT ) {
|
||
|
// don't generate a real edge for EOT; track alt EOT predicts
|
||
|
// generate that prediction in the else clause as default case
|
||
|
EOTTarget = (DFAState)edge.target;
|
||
|
EOTPredicts = EOTTarget.getUniquelyPredictedAlt();
|
||
|
/*
|
||
|
System.out.println("DFA s"+s.stateNumber+" EOT goes to s"+
|
||
|
edge.target.stateNumber+" predicates alt "+
|
||
|
EOTPredicts);
|
||
|
*/
|
||
|
continue;
|
||
|
}
|
||
|
StringTemplate edgeST = templates.getInstanceOf(dfaEdgeName);
|
||
|
// If the template wants all the label values delineated, do that
|
||
|
if ( edgeST.getFormalArgument("labels")!=null ) {
|
||
|
List labels = edge.label.getSet().toList();
|
||
|
for (int j = 0; j < labels.size(); j++) {
|
||
|
Integer vI = (Integer) labels.get(j);
|
||
|
String label =
|
||
|
parentGenerator.getTokenTypeAsTargetLabel(vI.intValue());
|
||
|
labels.set(j, label); // rewrite List element to be name
|
||
|
}
|
||
|
edgeST.setAttribute("labels", labels);
|
||
|
}
|
||
|
else { // else create an expression to evaluate (the general case)
|
||
|
edgeST.setAttribute("labelExpr",
|
||
|
parentGenerator.genLabelExpr(templates,edge,k));
|
||
|
}
|
||
|
|
||
|
// stick in any gated predicates for any edge if not already a pred
|
||
|
if ( !edge.label.isSemanticPredicate() ) {
|
||
|
DFAState target = (DFAState)edge.target;
|
||
|
SemanticContext preds =
|
||
|
target.getGatedPredicatesInNFAConfigurations();
|
||
|
if ( preds!=null ) {
|
||
|
//System.out.println("preds="+target.getGatedPredicatesInNFAConfigurations());
|
||
|
StringTemplate predST = preds.genExpr(parentGenerator,
|
||
|
parentGenerator.getTemplates(),
|
||
|
dfa);
|
||
|
edgeST.setAttribute("predicates", predST);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
StringTemplate targetST =
|
||
|
walkFixedDFAGeneratingStateMachine(templates,
|
||
|
dfa,
|
||
|
(DFAState)edge.target,
|
||
|
k+1);
|
||
|
edgeST.setAttribute("targetState", targetST);
|
||
|
dfaST.setAttribute("edges", edgeST);
|
||
|
/*
|
||
|
System.out.println("back to DFA "+
|
||
|
dfa.decisionNumber+"."+s.stateNumber);
|
||
|
*/
|
||
|
}
|
||
|
|
||
|
// HANDLE EOT EDGE
|
||
|
if ( EOTPredicts!=NFA.INVALID_ALT_NUMBER ) {
|
||
|
// EOT unique predicts an alt
|
||
|
dfaST.setAttribute("eotPredictsAlt", Utils.integer(EOTPredicts));
|
||
|
}
|
||
|
else if ( EOTTarget!=null && EOTTarget.getNumberOfTransitions()>0 ) {
|
||
|
// EOT state has transitions so must split on predicates.
|
||
|
// Generate predicate else-if clauses and then generate
|
||
|
// NoViableAlt exception as else clause.
|
||
|
// Note: these predicates emanate from the EOT target state
|
||
|
// rather than the current DFAState s so the error message
|
||
|
// might be slightly misleading if you are looking at the
|
||
|
// state number. Predicates emanating from EOT targets are
|
||
|
// hoisted up to the state that has the EOT edge.
|
||
|
for (int i = 0; i < EOTTarget.getNumberOfTransitions(); i++) {
|
||
|
Transition predEdge = (Transition)EOTTarget.transition(i);
|
||
|
StringTemplate edgeST = templates.getInstanceOf(dfaEdgeName);
|
||
|
edgeST.setAttribute("labelExpr",
|
||
|
parentGenerator.genSemanticPredicateExpr(templates,predEdge));
|
||
|
// the target must be an accept state
|
||
|
//System.out.println("EOT edge");
|
||
|
StringTemplate targetST =
|
||
|
walkFixedDFAGeneratingStateMachine(templates,
|
||
|
dfa,
|
||
|
(DFAState)predEdge.target,
|
||
|
k+1);
|
||
|
edgeST.setAttribute("targetState", targetST);
|
||
|
dfaST.setAttribute("edges", edgeST);
|
||
|
}
|
||
|
}
|
||
|
return dfaST;
|
||
|
}
|
||
|
}
|
||
|
|