Simple URI Parser

This is a simple, header only C++ library to allow parsing of URIs as defined by the URI generic schema (https://datatracker.ietf.org/doc/html/rfc3986).

This schema looks like

URI = scheme:[//authority]path[?query][#fragment]

Where the authority component is divided into the following components:

authority = [userinfo@]host[:port]

Usage

The library provides one function uri::parse_uri which takes a string argument and return a uri::URI structure. This structure has public fields which contain all the data parsed from the URI.

If an invalid URI is passed then the uri.error field is set to one of the errors in the uri::Error enum class and an empty URI structure is returned.

Example

#include <iostream>

#include "uri_parser.h"

int main()
{
    auto uri = uri::parse_uri("https://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top");
    
    std::cout << uri.scheme << std::endl;               // https
    std::cout << uri.authority.userinfo << std::endl;   // john.doe
    std::cout << uri.authority.host << std::endl;       // www.example.com
    std::cout << uri.authority.port << std::endl;       // 123
    std::cout << uri.path << std::endl;                 // /forum/questions/
    std::cout << uri.query_string << std::endl;         // ?tag=networking&order=newest
    std::cout << uri.query.size() << std::endl;         // 2
    std::cout << uri.query.at("tag") << std::endl;      // networking
    std::cout << uri.query.at("order") << std::endl;    // newest
    std::cout << uri.fragment << std::endl;             // top
}

Running tests

While the library is header only and can be included without any build required, there are a number of tests included which can be built and run using the following (from the library root directory):

cmake -Bbuild
cmake --build build/
./build/tests