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fail option on predicates work.

This commit is contained in:
Terence Parr 2012-10-20 15:57:06 -07:00
parent d96e02019a
commit ed7d4b1dc1
3 changed files with 29 additions and 11 deletions
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18
runtime/Java/src/org/antlr/v4/runtime/FailedPredicateException.java
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@ -40,6 +40,7 @@ import org.antlr.v4.runtime.misc.Nullable;
public class FailedPredicateException extends RecognitionException { public class FailedPredicateException extends RecognitionException {
public int ruleIndex; public int ruleIndex;
public int predIndex; public int predIndex;
public String predicate;
public String msg; public String msg;
public FailedPredicateException(Parser recognizer) { public FailedPredicateException(Parser recognizer) {
@ -52,8 +53,25 @@ public class FailedPredicateException extends RecognitionException {
PredicateTransition trans = (PredicateTransition)s.transition(0); PredicateTransition trans = (PredicateTransition)s.transition(0);
ruleIndex = trans.ruleIndex; ruleIndex = trans.ruleIndex;
predIndex = trans.predIndex; predIndex = trans.predIndex;
this.predicate = predicate;
this.msg = String.format("failed predicate: {%s}?", predicate); this.msg = String.format("failed predicate: {%s}?", predicate);
Token la = recognizer.getCurrentToken(); Token la = recognizer.getCurrentToken();
this.offendingToken = la; this.offendingToken = la;
} }
public FailedPredicateException(Parser recognizer,
@Nullable String predicate,
@Nullable String msg)
{
super(recognizer, recognizer.getInputStream(), recognizer._ctx);
ATNState s = recognizer.getInterpreter().atn.states.get(recognizer._ctx.s);
PredicateTransition trans = (PredicateTransition)s.transition(0);
ruleIndex = trans.ruleIndex;
predIndex = trans.predIndex;
this.predicate = predicate;
this.msg = msg;
Token la = recognizer.getCurrentToken();
this.offendingToken = la;
}
} }

2
tool/resources/org/antlr/v4/tool/templates/codegen/Java/Java.stg
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@ -489,7 +489,7 @@ ArgAction(a, chunks) ::= "<chunks>"
SemPred(p, chunks, failChunks) ::= << SemPred(p, chunks, failChunks) ::= <<
setState(<p.stateNumber>); setState(<p.stateNumber>);
if (!(<chunks>)) throw new FailedPredicateException(this, <if(p.msg)><p.msg><else><failChunks><endif>); if (!(<chunks>)) throw new FailedPredicateException(this, <p.predicate><if(failChunks)>, <failChunks><elseif(p.msg)>, <p.msg><endif>);
>> >>
ExceptionClause(e, catchArg, catchAction) ::= << ExceptionClause(e, catchArg, catchAction) ::= <<

20
tool/src/org/antlr/v4/codegen/model/SemPred.java
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@ -35,28 +35,28 @@ import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.codegen.model.chunk.ActionChunk; import org.antlr.v4.codegen.model.chunk.ActionChunk;
import org.antlr.v4.tool.ast.ActionAST; import org.antlr.v4.tool.ast.ActionAST;
import org.antlr.v4.tool.ast.GrammarAST; import org.antlr.v4.tool.ast.GrammarAST;
import org.antlr.v4.tool.ast.PredAST;
import java.util.List; import java.util.List;
/** */ /** */
public class SemPred extends Action { public class SemPred extends Action {
public String msg; // user-specified in grammar option public String msg; // user-specified string in fail grammar option
public String predicate; // the predicate string with { }? stripped
/** user-specified action in fail grammar option */
@ModelElement public List<ActionChunk> failChunks; @ModelElement public List<ActionChunk> failChunks;
public SemPred(OutputModelFactory factory, ActionAST ast) { public SemPred(OutputModelFactory factory, ActionAST ast) {
super(factory,ast); super(factory,ast);
GrammarAST failNode = ((PredAST)ast).getOptionAST("fail"); GrammarAST failNode = ast.getOptionAST("fail");
CodeGenerator gen = factory.getGenerator(); CodeGenerator gen = factory.getGenerator();
if ( failNode==null ) { predicate = ast.getText();
msg = ast.getText(); if (predicate.startsWith("{") && predicate.endsWith("}?")) {
if (msg.startsWith("{") && msg.endsWith("}?")) { predicate = predicate.substring(1, predicate.length() - 2);
msg = msg.substring(1, msg.length() - 2);
}
msg = gen.target.getTargetStringLiteralFromString(msg);
return;
} }
predicate = gen.target.getTargetStringLiteralFromString(predicate);
if ( failNode==null ) return;
if ( failNode instanceof ActionAST ) { if ( failNode instanceof ActionAST ) {
ActionAST failActionNode = (ActionAST)failNode; ActionAST failActionNode = (ActionAST)failNode;