public override ObjectType VisitRelationalExpression(QuestScriptParser.RelationalExpressionContext context)
{
var leftType = context.left.Accept(this);
var rightType = context.right.Accept(this);
if (TypeUtil.IsComparable(leftType) && TypeUtil.IsComparable(rightType))
{
return(ObjectType.Boolean); //comparison results are boolean of course...
}
_scriptEnvironmentBuilder.Errors.Add(new InvalidOperandsException(context, context.op.GetText(), leftType,
rightType));
return(ObjectType.Unknown);
}
public override Lazy <object> VisitRelationalExpression(QuestScriptParser.RelationalExpressionContext context)
{
var leftType = _scriptEnvironmentBuilder.TypeInferenceVisitor.Visit(context.left);
var rightType = _scriptEnvironmentBuilder.TypeInferenceVisitor.Visit(context.right);
if (!TypeUtil.IsComparable(leftType) ||
!TypeUtil.IsComparable(rightType))
{
_scriptEnvironmentBuilder.Errors.Add(new InvalidOperandsException(context, context.op.GetText(),
leftType, rightType));
return(new Lazy <object>(() => null));
}
return(new Lazy <object>(() =>
{
var left = context.left.Accept(this).Value.GetValueOrLazyValue();
var right = context.right.Accept(this).Value.GetValueOrLazyValue();
switch (context.op.GetText())
{
case ">":
return Cast((dynamic)left > (dynamic)right, ObjectType.Boolean);
case ">=":
return Cast((dynamic)left >= (dynamic)right, ObjectType.Boolean);
case "<":
return Cast((dynamic)left < (dynamic)right, ObjectType.Boolean);
case "<=":
return Cast((dynamic)left <= (dynamic)right, ObjectType.Boolean);
case "=":
return Cast((dynamic)left == (dynamic)right, ObjectType.Boolean);
case "<>": //alternate "not equals"
case "!=":
return Cast((dynamic)left != (dynamic)right, ObjectType.Boolean);
}
return true;
}));
}
public override bool VisitRelationalExpression(QuestScriptParser.RelationalExpressionContext context)
{
PrintBoolean(context.left, context.op.GetText(), context.right);
return(true);
}
