Class LogicalTautologyOrError

java.lang.Object

org.ek9lang.compiler.common.RuleSupport

org.ek9lang.compiler.common.TypedSymbolAccess

org.ek9lang.compiler.phase5.LogicalTautologyOrError

All Implemented Interfaces:

Consumer<EK9Parser.ExpressionContext>

final class LogicalTautologyOrError
extends TypedSymbolAccess
implements Consumer<EK9Parser.ExpressionContext>

Detects logical tautologies and contradictions (E08085).

Expressions like a or not a are always true (tautology) and a and not a are always false (contradiction). These indicate logic errors or dead code.

Only the direct pattern X op not X (and reversed not X op X) is detected. General propositional logic simplification is not attempted.

Field Summary

Fields inherited from class RuleSupport

errorListener, symbolsAndScopes

Constructor Summary

Constructors

Constructor	Description
LogicalTautologyOrError(SymbolsAndScopes symbolsAndScopes, ErrorListener errorListener)

Method Summary

Modifier and Type	Method	Description
void	accept(EK9Parser.ExpressionContext ctx)

Methods inherited from class TypedSymbolAccess

getRecordedAndTypedSymbol, isProcessingScopePure, recordATypedSymbol

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Consumer

andThen

Constructor Details

LogicalTautologyOrError

LogicalTautologyOrError(SymbolsAndScopes symbolsAndScopes,
 ErrorListener errorListener)

Method Details

accept

public void accept(EK9Parser.ExpressionContext ctx)

Specified by:

accept in interface Consumer<EK9Parser.ExpressionContext>