Webserv/srcs/json/Token.cpp

/**
 * @file Token.cpp
 * @brief The tokenizer read json file and when asked for give us the next token encounter and his type.
 * @author Narnaud
 * @version 0.1
 * @date 2023-01-17
 */
#include "webserv.hpp"

/**
 * @brief Constructor
 * Open conf file if he is readeable.
 *
 * @param fileName conf file path.
 */
Tokenizer::Tokenizer(string fileName) {
	file.open(fileName.c_str(), std::ios::in);
	if (!file.good()) std::cerr << "File open error.\n";
}

bool Tokenizer::hasMoreTokens() { return !file.eof(); }

char Tokenizer::getWithoutWhiteSpace() {
	char c = ' ';
	while ((c == ' ' || c == '\n') || c == '\t') {
		file.get(c);
		if ((c == ' ' || c == '\n') && !file.good()) {
			throw std::logic_error("Ran out of tokens");
		} else if (!file.good()) {
			return c;
		}
	}

	return c;
}

void Tokenizer::rollBackToken() {
	if (file.eof()) file.clear();
	file.seekg(prevPos);
}

Token Tokenizer::getToken() {
	char c;
	if (file.eof()) { cout << "Exhaused tokens\n"; }
	prevPos = file.tellg();
	c = getWithoutWhiteSpace();
	Token token;
	token.type = NULL_TYPE;
	if (c == '"') {
		token.type = STRING;
		token.value = "";
		file.get(c);
		while (c != '"') {
			if (c == '}' || c == ']' || c == ',') throw std::logic_error("Invalid json syntax: a string is not close");
			token.value += c;
			file.get(c);
		}
	} else if (c == '-' || (c >= '0' && c <= '9')) {
		token.type = NUMBER;
		token.value = "";
		token.value += c;
		std::streampos prevCharPos = file.tellg();
		while ((c == '-') || (c >= '0' && c <= '9') || c == '.') {
			prevCharPos = file.tellg();
			file.get(c);
			if (file.eof()) {
				break;
			} else {
				if ((c == '-') || (c >= '0' && c <= '9') || (c == '.')) token.value += c;
				else file.seekg(prevCharPos);
			}
		}
	} else if (c == 'f') {
		token.type = BOOLEAN;
		token.value = "False";
		file.seekg(4, std::ios_base::cur);
	} else if (c == 't') {
		token.type = BOOLEAN;
		token.value = "True";
		file.seekg(3, std::ios_base::cur);
	} else if (c == 'n') {
		token.type = NULL_TYPE;
		file.seekg(3, std::ios_base::cur);
	} else if (c == '{') token.type = CURLY_OPEN;
	else if (c == '}') token.type = CURLY_CLOSE;
	else if (c == '[') token.type = ARRAY_OPEN;
	else if (c == ']') token.type = ARRAY_CLOSE;
	else if (c == ':') token.type = COLON;
	else if (c == ',') token.type = COMMA;
	return token;
}