public void Visit(LetNode node)
{
var scopeLet = scope.CreateChild();
foreach (var expInit in node.Initialization)
{
expInit.AssignExp.Accept(new Tour2(scopeLet, errors));
var typeAssignExp = expInit.AssignExp.StaticType;
if (!scopeLet.IsDefinedType(expInit.Formal.Type.Text, out TypeInfo typeDeclared))
{
errors.Add(SemanticError.NotDeclaredType(expInit.Formal.Type));
}
if (!(typeAssignExp <= typeDeclared))
{
errors.Add(SemanticError.CannotConvert(expInit.Formal.Type, typeAssignExp, typeDeclared));
}
if (scopeLet.IsDefined(expInit.Formal.Id.Text, out TypeInfo typeOld))
{
scopeLet.Change(expInit.Formal.Id.Text, typeDeclared);
}
else
{
scopeLet.Define(expInit.Formal.Id.Text, typeDeclared);
}
}
node.ExpressionBody.Accept(new Tour2(scopeLet, errors));
node.StaticType = node.ExpressionBody.StaticType;
}
public void Visit(MethodNode node)
{
var scopeMethod = scope.CreateChild();
foreach (var arg in node.Arguments)
{
if (!scope.IsDefinedType(arg.Type.Text, out TypeInfo typeArg))
{
errors.Add(SemanticError.NotDeclaredType(arg.Type));
}
scopeMethod.Define(arg.Id.Text, typeArg);
}
if (!scope.IsDefinedType(node.TypeReturn.Text, out TypeInfo typeReturn))
{
errors.Add(SemanticError.NotDeclaredType(node.TypeReturn));
}
scope.Define(node.Id.Text, node.Arguments.Select(x => scope.GetType(x.Type.Text)).ToArray(), typeReturn);
node.Body.Accept(new Tour2(scopeMethod, errors));
if (!(node.Body.StaticType <= typeReturn))
{
errors.Add(SemanticError.CannotConvert(node.Body, node.Body.StaticType, typeReturn));
}
node.TypeReturn = new TypeNode(node.Body.Line, node.Body.Column, typeReturn.Text);
}
public void Visit(DispatchExplicitNode node)
{
node.Expression.Accept(this);
if (node.IdType.Text == "Object")
{
node.IdType = new TypeNode(node.Expression.Line, node.Expression.Column, node.Expression.StaticType.Text);
}
if (!scope.IsDefinedType(node.IdType.Text, out TypeInfo typeSuperClass))
{
errors.Add(SemanticError.NotDeclaredType(node.IdType));
}
if (!(node.Expression.StaticType <= typeSuperClass))
{
errors.Add(SemanticError.CannotConvert(node, node.Expression.StaticType, typeSuperClass));
}
node.Arguments.ForEach(x => x.Accept(this));
var scopeSuperClass = typeSuperClass.ClassReference.Scope;
if (!(scopeSuperClass.IsDefined(node.IdMethod.Text, node.Arguments.Select(x => x.StaticType).ToArray(), out node.StaticType)))
{
errors.Add(SemanticError.NotDeclareFunction(node, node.IdMethod.Text));
}
}
public void Visit(IfNode node)
{
node.Condition.Accept(this);
node.Body.Accept(this);
node.ElseBody.Accept(this);
if (node.Condition.StaticType.Text != "Bool")
{
errors.Add(SemanticError.CannotConvert(node.Condition, node.Condition.StaticType, scope.GetType("Bool")));
}
node.StaticType = Algorithm.LowerCommonAncestor(node.Body.StaticType, node.ElseBody.StaticType);
}
public void Visit(WhileNode node)
{
node.Condition.Accept(this);
node.Body.Accept(this);
if (node.Condition.StaticType.Text != "Bool")
{
errors.Add(SemanticError.CannotConvert(node.Condition, node.Condition.StaticType, scope.GetType("Bool")));
}
if (!scope.IsDefinedType("Object", out node.StaticType))
{
errors.Add(SemanticError.NotDeclaredType(new TypeNode(node.Line, node.Column, "Object")));
}
}
public void Visit(AssignmentNode node)
{
node.ExpressionRight.Accept(this);
if (!scope.IsDefined(node.ID.Text, out TypeInfo type))
{
errors.Add(SemanticError.NotDeclaredVariable(node.ID));
}
if (!(node.ExpressionRight.StaticType <= type))
{
errors.Add(SemanticError.CannotConvert(node, node.ExpressionRight.StaticType, type));
}
node.StaticType = node.ExpressionRight.StaticType;
}
public void Visit(AttributeNode node)
{
node.AssignExp.Accept(this);
var typeAssignExp = node.AssignExp.StaticType;
if (!scope.IsDefinedType(node.Formal.Type.Text, out TypeInfo typeDeclared))
{
errors.Add(SemanticError.NotDeclaredType(node.Formal.Type));
}
if (!(typeAssignExp <= typeDeclared))
{
errors.Add(SemanticError.CannotConvert(node.Formal.Type, typeAssignExp, typeDeclared));
}
scope.Define(node.Formal.Id.Text, typeDeclared);
}