public void Visit(Assignment asg)
{
if (asg.LoadExp != null)
{
asg.LoadExp.Accept(this);
}
asg.Exp.Accept(this);
var varName = asg.VarName;
StaticEnvBase.VarInfo varInfo;
if (asg.LoadExp != null)
{
var structType = asg.LoadExp.Type as StructType;
Raise <TypeCheckException> .IfIsNull(structType, "Can apply dot only on structs");
var field = structType.Fields.FirstOrDefault(f => f.Name == varName);
Raise <TypeCheckException> .IfIsNull(field, "Given struct type has not given field");
Raise <TypeCheckException> .IfAreNotSame(field.Type, asg.Exp.Type, "Wrong type in assignment");
varInfo = new StaticEnvBase.VarInfo(varName, asg.Exp.Type, StaticEnvBase.Kind.Field, field);
}
else if (_staticEnv.TryGetVariable(varName, out varInfo))
{
if (!varInfo.Type.Equals(_result))
{
throw new TypeCheckException(string.Format(
"Cannot re-assign {0} with a value of different type", varName));
}
}
else
{
var info = _currFunc.AddVariable(varName, asg.Exp.Type);
varInfo = new StaticEnvBase.VarInfo(varName, asg.Exp.Type, StaticEnvBase.Kind.Var, info);
_staticEnv.SetVariable(varName, varInfo);
}
asg.Var = varInfo;
}
public override bool TryGetVariable(string name, out VarInfo v)
{
return(_locals.TryGetValue(name, out v) || _parent.TryGetVariable(name, out v));
}