96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
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#include "wrenpp/vm_fun.hpp"
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#include "wrenpp/def_configuration.hpp"
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#include <iostream>
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#include <string_view>
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#include <map>
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#include <string>
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#include <functional>
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namespace {
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const constexpr char g_script[] = ""
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R"script(class Maths {
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foreign static mul(a,b)
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foreign static div(a,b)
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foreign static sum(a,b)
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foreign static sub(a,b)
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}
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var my_mul = Maths.mul(Maths.mul(2, 2), Maths.mul(3, 2)) - 4
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System.print("my_mul = %(my_mul) (expected: 20)")
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var my_sum = Maths.sum(Maths.sum(3, 4), Maths.sum(5, -1)) + 8
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System.print("my_sum = %(my_sum) (expected: 19)")
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var my_sub = Maths.sub(Maths.sub(8, 5), Maths.sub(20, 19)) + 1
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System.print("my_sub = %(my_sub) (expected: 3)")
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)script";
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class MyConfig : public wren::DefConfiguration {
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typedef std::map<std::string, wren::foreign_method_t> MethodMap;
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public:
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wren::foreign_method_t foreign_method_fn(
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wren::VM* vm,
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const char* module_ptr,
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const char* class_name_ptr,
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bool is_static,
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const char* signature_ptr
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) {
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auto key = to_map_key(module_ptr, class_name_ptr, signature_ptr);
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auto it_found = m_foreign_methods.find(key);
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if (m_foreign_methods.end() != it_found)
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return it_found->second;
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else
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return nullptr;
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}
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void register_foreign_method (
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std::string_view module_name,
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std::string_view class_name,
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std::string_view func_name,
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wren::foreign_method_t fn
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) {
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m_foreign_methods[to_map_key(module_name, class_name, func_name)] = fn;
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}
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private:
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static std::string to_map_key(
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std::string_view module_name,
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std::string_view class_name,
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std::string_view func_name
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) {
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std::string key;
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key.reserve(module_name.size() + class_name.size() + func_name.size() + 4);
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key.append(module_name);
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key += "::";
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key.append(class_name);
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key += "::";
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key.append(func_name);
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return key;
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}
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MethodMap m_foreign_methods;
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};
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template <typename Op>
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void do_op(wren::VM& vm) {
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using wren::get;
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set(vm, 0, Op()(get<int>(vm, 1), get<int>(vm, 2)));
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}
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} //unnamed namespace
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int main() {
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MyConfig config;
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config.register_foreign_method("main", "Maths", "sum(_,_)", &do_op<std::plus<int>>);
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config.register_foreign_method("main", "Maths", "sub(_,_)", &do_op<std::minus<int>>);
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config.register_foreign_method("main", "Maths", "mul(_,_)", &do_op<std::multiplies<int>>);
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config.register_foreign_method("main", "Maths", "div(_,_)", &do_op<std::divides<int>>);
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wren::VM vm(&config, nullptr);
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vm.interpret("main", g_script);
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std::cout << "Dynafunc mem usage: " << vm.dynafunc_byte_size() << " bytes\n";
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return 0;
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}
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