49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
#include "parsed_type.hpp"
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#include <sstream>
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#include "type.hpp"
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#include "type_env.hpp"
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#include "error.hpp"
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type_ptr parsed_type_app::to_type(
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const std::set<std::string>& vars,
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const type_env& e) const {
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auto parent_type = e.lookup_type(name);
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if(parent_type == nullptr)
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throw type_error(std::string("no such type or type constructor ") + name);
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type_base* base_type;
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if(!(base_type = dynamic_cast<type_base*>(parent_type.get())))
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throw type_error(std::string("invalid type ") + name);
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if(base_type->arity != arguments.size()) {
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std::ostringstream error_stream;
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error_stream << "invalid application of type ";
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error_stream << name;
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error_stream << "(" << base_type->arity << " arguments expected, ";
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error_stream << "but " << arguments.size() << " were provided)";
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throw type_error(error_stream.str());
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}
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type_app* new_app = new type_app(std::move(parent_type));
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type_ptr to_return(new_app);
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for(auto& arg : arguments) {
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new_app->arguments.push_back(arg->to_type(vars, e));
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}
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return to_return;
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}
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type_ptr parsed_type_var::to_type(
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const std::set<std::string>& vars,
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const type_env& e) const {
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if(vars.find(var) == vars.end())
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throw type_error(std::string("the type variable ") + var + std::string(" was not explicitly declared."));
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return type_ptr(new type_var(var));
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}
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type_ptr parsed_type_arr::to_type(
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const std::set<std::string>& vars,
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const type_env& env) const {
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auto new_left = left->to_type(vars, env);
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auto new_right = right->to_type(vars, env);
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return type_ptr(new type_arr(std::move(new_left), std::move(new_right)));
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}
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