cplusplus.js/src/proc/document.cpp

#ifndef CJS_PROC_DOCUMENT
#define CJS_PROC_DOCUMENT

#include <string>
#include <stdexcept>
#include "string.cpp"

namespace cjs {
    namespace doc {
        #include <emscripten.h>

        cjs_str* _query_select_property(std::string method, std::string query_selector, int nth_elem = 0) {
            int method_pass = cjs::str::pass(cjs::str::cpp_to_c(method), method.length());
            int query_pass = cjs::str::pass(cjs::str::cpp_to_c(query_selector), query_selector.length());

            int return_str_pass = EM_ASM_INT({
                try {
                    return cjs.string_pass(document.querySelectorAll(cjs.receive($1))[$2][cjs.receive($0)]);
                } catch (e) {
                    return 0;
                }
            }, method_pass, query_pass, nth_elem);

            if ( return_str_pass == 0 ) {
                throw std::runtime_error("The property or element is undefined.");
            }

            cjs_str* return_str = cjs::str::receive(return_str_pass);
            return return_str;
        }

        cjs_str* _query_select_attribute(std::string attribute, std::string query_selector, int nth_elem = 0) {
            int attribute_pass = cjs::str::pass(cjs::str::cpp_to_c(attribute), attribute.length());
            int query_pass = cjs::str::pass(cjs::str::cpp_to_c(query_selector), query_selector.length());

            int return_str_pass = EM_ASM_INT({
                try {
                    return cjs.string_pass(document.querySelectorAll(cjs.receive($1))[$2].getAttribute(cjs.receive($0)));
                } catch (e) {
                    return 0;
                }
            }, attribute_pass, query_pass, nth_elem);

            if ( return_str_pass == 0 ) {
                throw std::runtime_error("The attribute or element is undefined.");
            }

            cjs_str* return_str = cjs::str::receive(return_str_pass);
            return return_str;
        }

        void _query_set_property(std::string property, std::string value, std::string query_selector, int nth_elem = 0) {
            int property_pass = cjs::str::pass(cjs::str::cpp_to_c(property), property.length());
            int value_pass = cjs::str::pass(cjs::str::cpp_to_c(value), value.length());
            int query_pass = cjs::str::pass(cjs::str::cpp_to_c(query_selector), query_selector.length());

            EM_ASM({
                document.querySelectorAll(cjs.receive($2))[$3][cjs.receive($0)] = cjs.receive($1);
            }, property_pass, value_pass, query_pass, nth_elem);
        }

        void _query_set_attribute(std::string attribute, std::string value, std::string query_selector, int nth_elem = 0) {
            int attribute_pass = cjs::str::pass(cjs::str::cpp_to_c(attribute), attribute.length());
            int value_pass = cjs::str::pass(cjs::str::cpp_to_c(value), value.length());
            int query_pass = cjs::str::pass(cjs::str::cpp_to_c(query_selector), query_selector.length());

            EM_ASM({
                document.querySelectorAll(cjs.receive($2))[$3].setAttribute(cjs.receive($0), cjs.receive($1));
            }, attribute_pass, value_pass, query_pass, nth_elem);
        }

        void link_event_bus(std::string dom_event, std::string event_bus_key, std::string query_selector, int nth_elem = 0) {
            int dom_event_pass = cjs::str::pass(cjs::str::cpp_to_c(dom_event), dom_event.length());
            int event_bus_key_pass = cjs::str::pass(cjs::str::cpp_to_c(event_bus_key), event_bus_key.length());
            int query_pass = cjs::str::pass(cjs::str::cpp_to_c(query_selector), query_selector.length());

            EM_ASM({
                document.querySelectorAll(cjs.receive($2))[$3].addEventListener(cjs.receive($0), () => cjs.fire_event_bus(cjs.receive($1)));
            }, dom_event_pass, event_bus_key_pass, query_pass, nth_elem);
        }

        cjs_str* get_inner_html_of(std::string query_selector, int nth_elem = 0) {
            return _query_select_property("innerHTML", query_selector, nth_elem);
        }

        void set_inner_html_of(std::string query_selector, std::string value, int nth_elem = 0) {
            _query_set_property("innerHTML", value, query_selector, nth_elem);
        }

        cjs_str* get_inner_text_of(std::string query_selector, int nth_elem = 0) {
            return _query_select_property("innerText", query_selector, nth_elem);
        }

        void set_inner_text_of(std::string query_selector, std::string value, int nth_elem = 0) {
            _query_set_property("innerText", value, query_selector, nth_elem);
        }

        cjs_str* get_id_of(std::string query_selector, int nth_elem = 0) {
            return _query_select_property("id", query_selector, nth_elem);
        }

        void set_id_of(std::string query_selector, std::string value, int nth_elem = 0) {
            _query_set_property("id", value, query_selector, nth_elem);
        }

        cjs_str* get_class_of(std::string query_selector, int nth_elem = 0) {
            return _query_select_attribute("class", query_selector, nth_elem);
        }

        void set_class_of(std::string query_selector, std::string cls, int nth_elem = 0) {
            return _query_set_attribute("class", cls, query_selector, nth_elem);
        }
    }
}

#endif //CJS_PROC_DOCUMENT