114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
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#pragma once
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#include <vector>
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#include <map>
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#include <string>
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#include <memory>
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#include <functional>
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#include <boost/variant.hpp>
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namespace mstch {
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struct config {
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static std::function<std::string(const std::string&)> escape;
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};
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namespace internal {
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template<class N>
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class object_t {
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public:
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const N& at(const std::string& name) const {
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cache[name] = (methods.at(name))();
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return cache[name];
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}
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bool has(const std::string name) const {
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return methods.count(name) != 0;
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}
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protected:
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template<class S>
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void register_methods(S* s, std::map<std::string,N(S::*)()> methods) {
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for(auto& item: methods)
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this->methods.insert({item.first, std::bind(item.second, s)});
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}
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private:
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std::map<std::string, std::function<N()>> methods;
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mutable std::map<std::string, N> cache;
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};
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template<class T, class N>
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class is_fun {
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private:
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using not_fun = char;
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using fun_without_args = char[2];
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using fun_with_args = char[3];
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template <typename U, U> struct really_has;
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template <typename C> static fun_without_args& test(
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really_has<N(C::*)() const, &C::operator()>*);
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template <typename C> static fun_with_args& test(
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really_has<N(C::*)(const std::string&) const,
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&C::operator()>*);
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template <typename> static not_fun& test(...);
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public:
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static bool const no_args = sizeof(test<T>(0)) == sizeof(fun_without_args);
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static bool const has_args = sizeof(test<T>(0)) == sizeof(fun_with_args);
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};
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template<class N>
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using node_renderer = std::function<std::string(const N& n)>;
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template<class N>
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class lambda_t {
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public:
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template<class F>
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lambda_t(F f, typename std::enable_if<is_fun<F, N>::no_args>::type* = 0):
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fun([f](node_renderer<N> renderer, const std::string&) {
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return renderer(f());
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})
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{
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}
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template<class F>
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lambda_t(F f, typename std::enable_if<is_fun<F, N>::has_args>::type* = 0):
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fun([f](node_renderer<N> renderer, const std::string& text) {
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return renderer(f(text));
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})
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{
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}
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std::string operator()(node_renderer<N> renderer,
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const std::string& text = "") const
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{
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return fun(renderer, text);
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}
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private:
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std::function<std::string(node_renderer<N> renderer, const std::string&)> fun;
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};
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}
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using node = boost::make_recursive_variant<
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std::nullptr_t, std::string, int, double, bool,
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internal::lambda_t<boost::recursive_variant_>,
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std::shared_ptr<internal::object_t<boost::recursive_variant_>>,
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std::map<const std::string, boost::recursive_variant_>,
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std::vector<boost::recursive_variant_>>::type;
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using object = internal::object_t<node>;
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using lambda = internal::lambda_t<node>;
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using map = std::map<const std::string, node>;
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using array = std::vector<node>;
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std::string render(
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const std::string& tmplt,
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const node& root,
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const std::map<std::string,std::string>& partials =
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std::map<std::string,std::string>());
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}
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