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95 lines
2.4 KiB
95 lines
2.4 KiB
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#include "httplib.h"
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#include "peglib.h"
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#include <cstdio>
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#include <functional>
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using namespace httplib;
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using namespace std;
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function<void (size_t, size_t, const string&)> makeJSONFormatter(string& json)
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{
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auto init = make_shared<bool>(true);
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return [&json, init](size_t ln, size_t col, const string& msg) mutable {
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if (!init) {
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json += ",";
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}
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json += "{";
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json += R"("ln":)" + to_string(ln) + ",";
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json += R"("col":)" + to_string(col) + ",";
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json += R"("msg":")" + msg + R"(")";
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json += "}";
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*init = false;
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};
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}
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bool parse_grammar(const string& text, peglib::peg& peg, string& json)
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{
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peg.log = makeJSONFormatter(json);
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json += "[";
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auto ret = peg.load_grammar(text.data(), text.size());
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json += "]";
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return ret;
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}
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bool parse_code(const string& text, peglib::peg& peg, string& json)
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{
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peg.log = makeJSONFormatter(json);
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json += "[";
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auto ret = peg.parse_n(text.data(), text.size());
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json += "]";
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return ret;
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}
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int main(void)
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{
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Server svr;
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if (!svr.set_base_dir("./www")) {
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cerr << "invalid 'www' directory." << endl;
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return -1;
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}
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svr.post("/parse", [](const Request& req, Response& res) {
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const auto& grammarText = req.params.at("grammar");
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string grammarResult;
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string codeResult;
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peglib::peg peg;
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auto ret = parse_grammar(grammarText, peg, grammarResult);
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if (ret && peg) {
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const auto& codeText = req.params.at("code");
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parse_code(codeText, peg, codeResult);
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}
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string json;
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json += "{";
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json += "\"grammar\":" + grammarResult;
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if (!codeResult.empty()) {
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json += +",";
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json += "\"code\":" + codeResult;
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}
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json += "}";
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res.set_header("Access-Control-Allow-Origin", "*");
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res.set_header("Access-Control-Allow-Methods", "POST");
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res.set_content(json, "application/json");
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});
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svr.set_error_handler([](const Request& req, Response& res) {
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const char* fmt = "<p>Error Status: <span style='color:red;'>%d</span></p>";
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char buf[BUFSIZ];
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snprintf(buf, sizeof(buf), fmt, res.status);
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res.set_content(buf, "text/html");
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});
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svr.listen("localhost", 1234);
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return 0;
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}
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// vim: et ts=4 sw=4 cin cino={1s ff=unix
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