#include "type.hpp"
#include "std.hpp"

static struct v_type : public Type {
	bool canCastTo(Type* t)
	{
		return t == Type::void_type;
	}
} v;

static struct i_type : public Type {
	bool intType()
	{
		return true;
	}
	bool canCastTo(Type* t)
	{
		return t == Type::int_type || t == Type::float_type || t == Type::string_type;
	}
} i;

static struct f_type : public Type {
	bool floatType()
	{
		return true;
	}
	bool canCastTo(Type* t)
	{
		return t == Type::int_type || t == Type::float_type || t == Type::string_type;
	}
} f;

static struct s_type : public Type {
	bool stringType()
	{
		return true;
	}
	bool canCastTo(Type* t)
	{
		return t == Type::int_type || t == Type::float_type || t == Type::string_type;
	}
} s;

bool StructType::canCastTo(Type* t)
{
	return t == this || t == Type::null_type || (this == Type::null_type && t->structType());
}

bool VectorType::canCastTo(Type* t)
{
	if (this == t)
		return true;
	if (VectorType* v = t->vectorType()) {
		if (elementType != v->elementType)
			return false;
		if (sizes.size() != v->sizes.size())
			return false;
		for (int k = 0; k < sizes.size(); ++k) {
			if (sizes[k] != v->sizes[k])
				return false;
		}
		return true;
	}
	return false;
}

static StructType n("Null");

Type* Type::void_type   = &v;
Type* Type::int_type    = &i;
Type* Type::float_type  = &f;
Type* Type::string_type = &s;
Type* Type::null_type   = &n;