public UstNode VisitPatternLiterals([NotNull] DslParser.PatternLiteralsContext context)
{
Expression result;
PatternVarDef patternVarDef;
if (context.patternNotLiteral().Length == 1)
{
result = (Expression)VisitPatternNotLiteral(context.patternNotLiteral().First());
if (context.PatternVar() != null)
{
string id = context.PatternVar().GetText().Substring(1);
if (!patternVarDefs.TryGetValue(id, out patternVarDef))
{
patternVarDef = new PatternVarDef(id, new Expression[] { result }, context.GetTextSpan());
patternVarDefs[id] = patternVarDef;
}
else
{
if (context.patternNotLiteral().Length != 0)
{
var lcTextSpan = new LineColumnTextSpan(patternVarDef.TextSpan, Data);
throw new ConversionException(
$"DSL Error: PatternVar {id} with matching Id already defined earlier at {lcTextSpan}")
{
TextSpan = context.PatternVar().GetTextSpan()
};
}
}
result = new PatternVarRef(patternVarDef, context.GetTextSpan());
}
}
else
{
List <Expression> values = context.patternNotLiteral()
.Select(literal => (Expression)VisitPatternNotLiteral(literal)).ToList();
if (values.Count == 0)
{
values.Add(new PatternIdToken("", context.GetTextSpan()));
}
if (context.PatternVar() == null)
{
result = new PatternVarDef(GetNewVarDefName(), values, context.GetTextSpan());
}
else
{
string id = context.PatternVar().GetText().Substring(1);
if (!patternVarDefs.TryGetValue(id, out patternVarDef))
{
patternVarDef = new PatternVarDef(id, values, context.GetTextSpan());
patternVarDefs[id] = patternVarDef;
}
else
{
if (context.patternNotLiteral().Length != 0)
{
var lcTextSpan = new LineColumnTextSpan(patternVarDef.TextSpan, Data);
throw new ConversionException(
$"DSL Error: PatternVar {id} with matching Id already defined earlier at {lcTextSpan}")
{
TextSpan = context.PatternVar().GetTextSpan()
};
}
}
result = new PatternVarRef(patternVarDef, context.GetTextSpan());
}
}
return(result);
}
public virtual void Exit(PatternVarRef patternVarRef)
{
}
public virtual UstNode Visit(PatternVarRef patternVarRef)
{
return(VisitChildren(patternVarRef));
}
public virtual void Enter(PatternVarRef patternVarRef)
{
}