107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
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#include "json.hpp"
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#include <cstdlib>
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#include <format>
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#include <iostream>
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#include <string>
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#include <unordered_map>
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using namespace sliger::json;
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auto ident_tok_typs = std::unordered_map<std::string, TokTyp> {
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{ "null", TokTyp::Null },
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{ "false", TokTyp::False },
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{ "true", TokTyp::True },
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};
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auto id_start_chars = "abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ_";
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auto id_tail_chars = "abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"1234567890";
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auto Lexer::next() -> Tok
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{
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if (done()) {
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return TokTyp::Eof;
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}
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auto pos = this->pos();
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if (test('"')) {
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step();
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auto value = std::string();
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while (!done() and !test('"')) {
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if (cur() == '\\') {
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step();
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if (done())
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break;
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value.push_back([&] {
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char ch = cur();
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switch (ch) {
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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case '0':
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return '\0';
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default:
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return ch;
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}
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}());
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} else {
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value.push_back(cur());
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}
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step();
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}
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}
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auto step_n_ret = [&](auto tok) {
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step();
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return tok;
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};
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switch (cur()) {
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case '0':
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return step_n_ret(Tok(TokTyp::Float, 0.0));
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case '{':
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return step_n_ret(TokTyp::LBrace);
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case '}':
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return step_n_ret(TokTyp::RBrace);
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case '[':
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return step_n_ret(TokTyp::LBracket);
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case ']':
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return step_n_ret(TokTyp::RBracket);
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case ',':
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return step_n_ret(TokTyp::Comma);
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case ':':
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return step_n_ret(TokTyp::Colon);
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}
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if (test_in(id_start_chars)) {
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auto value = std::string();
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while (test_in(id_tail_chars)) {
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value.push_back(cur());
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step();
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}
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if (ident_tok_typs.find(value) == ident_tok_typs.end()) {
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std::cerr << std::format("sliger::json::Lexer error: unknown "
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"identifier \"{}\" at {}:{}",
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value, pos.col, pos.line);
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return TokTyp::Error;
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}
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return ident_tok_typs.at(value);
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}
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if (test_in("123456789")) {
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auto value_str = std::string();
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while (test_in("1234567890")) {
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value_str.push_back(cur());
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step();
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}
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auto value = std::atof(value_str.c_str());
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return Tok(TokTyp::Float, value);
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}
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std::cerr << std::format(
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"sliger::json::Lexer error: unknown character '{}' at {}:{}", cur(),
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this->line, this->col);
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step();
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return TokTyp::Error;
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}
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