ragel解析http url

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已于 2022-01-28 14:00:17 修改 · 3k 阅读

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#http #网络协议 #网络

于 2022-01-28 08:34:38 首次发布

本文介绍了一个基于RFC3986标准的通用URI解析器实现细节。该解析器使用C++编写，通过状态机的方式解析URI，并将各部分信息如scheme、authority、path等分离出来。通过对URI结构的深入分析，该解析器能够有效处理各种复杂的URI格式。

#include <iostream>
#include <string>

using namespace std;

%%{
   
   
    # See RFC 3986: http://www.ietf.org/rfc/rfc3986.txt

    machine uri_parser;

    gen_delims = ":" | "/" | "?" | "#" | "[" | "]" | "@";
    sub_delims = "!" | "$" | "&" | "'" | "(" | ")" | "*" | "+" | "," | ";" | "=";
    reserved = gen_delims | sub_delims;
    unreserved = alpha | digit | "-" | "." | "_" | "~";
    pct_encoded = "%" xdigit xdigit;

    action marku {
   
    mark = fpc; }
    action markh {
   
    mark = fpc; }

    action save_scheme
    {
   
   
        uri->setScheme(std::string(mark, fpc - mark));
        mark = NULL;
    }

    scheme = (alpha (alpha | digit | "+" | "-" | ".")*) >marku %save_scheme;

    action save_port
    {
   
   
        if (fpc != mark) {
   
   
            uri->setPort(atoi(mark));
        }
        mark = NULL;
    }
    action save_userinfo
    {
   
   
        if(mark) {
   
   
            //std::cout << std::string(mark, fpc - mark) << std::endl;
            uri->setUserinfo(std::string(mark, fpc - mark));
        }
        mark = NULL;
    }
    action save_host
    {
   
   
        if (mark != NULL) {
   
   
            //std::cout << std::string(mark, fpc - mark) << std::endl;
            uri->setHost(std::string(mark

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