C++ BNF语法解析

https://github.com/r35382/bnflite

#include "bnflite/bnflite.h"
#include <iostream>

typedef bnf::Interface<double> Calc;
/* pass number result */
Calc DoNumber(std::vector<Calc>& res)
{
	char* lst;
	double value = strtod(res[0].text, &lst); // formaly it is not correct for not 0-terminated strings
	Calc ret(value, res);
	if (lst - res[0].text - ret.length != 0) {
		std::cout << "number parse error:"; std::cout.write(ret.text, ret.length);
	}
	return ret;
}

int main_bnflite(int argc, char* argv[]) {
	//int argc1 = 3;
	//char* argv1[3] = { "sjijasd", "测试", "。，.,,.." };
	//main_prettyprint(argc1, argv1);

	bnf::Token token('0', '9');
	bnf::Lexem number = 6 * token;
	bnf::Rule positiveNum = !bnf::Token('-') | number;
	bnf::Bind(positiveNum, DoNumber);
	const char* tail = 0;

	typedef bnf::Interface<double> Calc;
	Calc result;
	std::string clc("123456");
	int tst = bnf::Analyze(positiveNum, clc.c_str(), &tail, result);
	if (tst > 0)
		std::cout << "Result of " << clc << " = " << result.data << std::endl;
	else
		std::cout << "Parsing errors detected, status = " << std::hex << tst << std::endl
		<< "stopped at: " << tail << std::endl;
	return 0;
}

创作不易，小小的支持一下吧！