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       1             : //
       2             : // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
       3             : // Copyright (c) 2022 Alan de Freitas (alandefreitas@gmail.com)
       4             : //
       5             : // Distributed under the Boost Software License, Version 1.0. (See accompanying
       6             : // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
       7             : //
       8             : // Official repository: https://github.com/boostorg/url
       9             : //
      10             : 
      11             : #ifndef BOOST_URL_URL_VIEW_HPP
      12             : #define BOOST_URL_URL_VIEW_HPP
      13             : 
      14             : #include <boost/url/detail/config.hpp>
      15             : #include <boost/url/url_view_base.hpp>
      16             : #include <utility>
      17             : 
      18             : namespace boost {
      19             : namespace urls {
      20             : 
      21             : /** A non-owning reference to a valid URL 
      22             : 
      23             :     Objects of this type represent valid URL
      24             :     strings constructed from a parsed, external
      25             :     character buffer whose storage is managed
      26             :     by the caller. That is, it acts like a
      27             :     `core::string_view` in terms of ownership.
      28             :     The caller is responsible for ensuring
      29             :     that the lifetime of the underlying
      30             :     character buffer extends until it is no
      31             :     longer referenced.
      32             : 
      33             :     @par Example 1
      34             :     Construction from a string parses the input
      35             :     as a <em>URI-reference</em> and throws an
      36             :     exception on error. Upon success, the
      37             :     constructed object points to the passed
      38             :     character buffer; ownership is not
      39             :     transferred.
      40             :     @code
      41             :     url_view u( "https://www.example.com/index.htm?text=none#a1" );
      42             :     @endcode
      43             : 
      44             :     @par Example 2
      45             :     Parsing functions like @ref parse_uri_reference
      46             :     return a @ref result containing either a valid
      47             :     @ref url_view upon succcess, otherwise they
      48             :     contain an error. The error can be converted to
      49             :     an exception by the caller if desired:
      50             :     @code
      51             :     system::result< url_view > rv = parse_uri_reference( "https://www.example.com/index.htm?text=none#a1" );
      52             :     @endcode
      53             : 
      54             :     @par BNF
      55             :     @code
      56             :     URI-reference = URI / relative-ref
      57             : 
      58             :     URI           = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
      59             : 
      60             :     relative-ref  = relative-part [ "?" query ] [ "#" fragment ]
      61             :     @endcode
      62             : 
      63             :     @par Specification
      64             :     @li <a href="https://tools.ietf.org/html/rfc3986"
      65             :         >Uniform Resource Identifier (URI): Generic Syntax (rfc3986)</a>
      66             : 
      67             :     @see
      68             :         @ref parse_absolute_uri,
      69             :         @ref parse_origin_form,
      70             :         @ref parse_relative_ref,
      71             :         @ref parse_uri,
      72             :         @ref parse_uri_reference.
      73             : */
      74          31 : class BOOST_URL_DECL url_view
      75             :     : public url_view_base
      76             : {
      77             :     friend std::hash<url_view>;
      78             :     friend class url_view_base;
      79             :     friend class params_base;
      80             :     friend class params_encoded_base;
      81             : 
      82             : #ifndef BOOST_URL_DOCS
      83             :     // VFALCO docca emits this erroneously
      84             :     friend struct detail::url_impl;
      85             : #endif
      86             : 
      87             :     using url_view_base::digest;
      88             : 
      89             :     explicit
      90        3521 :     url_view(
      91             :         detail::url_impl const& impl) noexcept
      92        3521 :         : url_view_base(impl)
      93             :     {
      94        3521 :     }
      95             : 
      96             : public:
      97             :     //--------------------------------------------
      98             :     //
      99             :     // Special Members
     100             :     //
     101             :     //--------------------------------------------
     102             : 
     103             :     /** Destructor
     104             : 
     105             :         Any params, segments, iterators, or
     106             :         other views which reference the same
     107             :         underlying character buffer remain
     108             :         valid.
     109             :     */
     110             :     ~url_view() = default;
     111             : 
     112             :     /** Constructor
     113             : 
     114             :         Default constructed views refer to
     115             :         a string with zero length, which
     116             :         always remains valid. This matches
     117             :         the grammar for a relative-ref with
     118             :         an empty path and no query or
     119             :         fragment.
     120             : 
     121             :         @par Example
     122             :         @code
     123             :         url_view u;
     124             :         @endcode
     125             : 
     126             :         @par Postconditions
     127             :         @code
     128             :         this->empty() == true
     129             :         @endcode
     130             : 
     131             :         @par Complexity
     132             :         Constant.
     133             : 
     134             :         @par Exception Safety
     135             :         Throws nothing.
     136             : 
     137             :         @par BNF
     138             :         @code
     139             :         relative-ref  = relative-part [ "?" query ] [ "#" fragment ]
     140             :         @endcode
     141             : 
     142             :         @par Specification
     143             :         <a href="https://datatracker.ietf.org/doc/html/rfc3986#section-4.2"
     144             :             >4.2. Relative Reference (rfc3986)</a>
     145             :     */
     146             :     url_view() noexcept;
     147             : 
     148             :     /** Constructor
     149             : 
     150             :         This function constructs a URL from
     151             :         the string `s`, which must contain a
     152             :         valid <em>URI</em> or <em>relative-ref</em>
     153             :         or else an exception is thrown. Upon
     154             :         successful construction, the view
     155             :         refers to the characters in the
     156             :         buffer pointed to by `s`.
     157             :         Ownership is not transferred; The caller
     158             :         is responsible for ensuring that the
     159             :         lifetime of the buffer extends until
     160             :         it is no longer referenced.
     161             : 
     162             :         @par Example
     163             :         @code
     164             :         url_view u( "http://www.example.com/index.htm" );
     165             :         @endcode
     166             : 
     167             :         @par Effects
     168             :         @code
     169             :         return parse_uri_reference( s ).value();
     170             :         @endcode
     171             : 
     172             :         @par Complexity
     173             :         Linear in `s.size()`.
     174             : 
     175             :         @par Exception Safety
     176             :         Exceptions thrown on invalid input.
     177             : 
     178             :         @throw system_error
     179             :         The input failed to parse correctly.
     180             : 
     181             :         @param s The string to parse.
     182             : 
     183             :         @par BNF
     184             :         @code
     185             :         URI           = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
     186             : 
     187             :         relative-ref  = relative-part [ "?" query ] [ "#" fragment ]
     188             :         @endcode
     189             : 
     190             :         @par Specification
     191             :         @li <a href="https://datatracker.ietf.org/doc/html/rfc3986#section-4.1"
     192             :             >4.1. URI Reference</a>
     193             : 
     194             :         @see
     195             :             @ref parse_uri_reference.
     196             :     */
     197             :     url_view(core::string_view s);
     198             : 
     199             :     /// @copydoc url_view(core::string_view)
     200             :     template<
     201             :         class String
     202             : #ifndef BOOST_URL_DOCS
     203             :         , class = typename std::enable_if<
     204             :             std::is_convertible<
     205             :                 String,
     206             :                 core::string_view
     207             :                     >::value &&
     208             :             !std::is_convertible<
     209             :                 String*,
     210             :                 url_view_base*
     211             :                     >::value
     212             :             >::type
     213             : #endif
     214             :     >
     215         217 :     url_view(
     216             :         String const& s)
     217             :         : url_view(
     218         217 :             detail::to_sv(s))
     219             :     {
     220         216 :     }
     221             : 
     222             :     /** Constructor
     223             : 
     224             :         After construction, both views
     225             :         reference the same underlying character
     226             :         buffer. Ownership is not transferred.
     227             : 
     228             :         @par Postconditions
     229             :         @code
     230             :         this->buffer().data() == other.buffer().data()
     231             :         @endcode
     232             : 
     233             :         @par Complexity
     234             :         Constant.
     235             : 
     236             :         @par Exception Safety
     237             :         Throws nothing.
     238             :     */
     239       15536 :     url_view(
     240             :         url_view const& other) noexcept
     241       15536 :         : url_view(static_cast<
     242       15536 :             url_view_base const&>(other))
     243             :     {
     244       15536 :     }
     245             : 
     246             :     /** Constructor
     247             : 
     248             :         After construction, both views
     249             :         reference the same underlying character
     250             :         buffer. Ownership is not transferred.
     251             : 
     252             :         @par Postconditions
     253             :         @code
     254             :         this->buffer().data() == other.buffer().data()
     255             :         @endcode
     256             : 
     257             :         @par Complexity
     258             :         Constant.
     259             : 
     260             :         @par Exception Safety
     261             :         Throws nothing.
     262             :     */
     263             :     url_view(
     264             :         url_view_base const& other) noexcept;
     265             : 
     266             :     /** Assignment
     267             : 
     268             :         After assignment, both views
     269             :         reference the same underlying character
     270             :         buffer. Ownership is not transferred.
     271             : 
     272             :         @par Postconditions
     273             :         @code
     274             :         this->buffer().data() == other.buffer().data()
     275             :         @endcode
     276             : 
     277             :         @par Complexity
     278             :         Constant.
     279             : 
     280             :         @par Exception Safety
     281             :         Throws nothing.
     282             :     */
     283             :     url_view&
     284          13 :     operator=(
     285             :         url_view const& other) noexcept
     286             :     {
     287          13 :         if (this != &other)
     288             :             *this = static_cast<
     289          12 :                 url_view_base const&>(other);
     290          13 :         return *this;
     291             :     }
     292             : 
     293             :     /** Assignment
     294             : 
     295             :         After assignment, both views
     296             :         reference the same underlying character
     297             :         buffer. Ownership is not transferred.
     298             : 
     299             :         @par Postconditions
     300             :         @code
     301             :         this->buffer().data() == other.buffer().data()
     302             :         @endcode
     303             : 
     304             :         @par Complexity
     305             :         Constant.
     306             : 
     307             :         @par Exception Safety
     308             :         Throws nothing.
     309             :     */
     310             :     url_view& operator=(
     311             :         url_view_base const& other) noexcept;
     312             : 
     313             :     //--------------------------------------------
     314             :     //
     315             :     // Observers
     316             :     //
     317             :     //--------------------------------------------
     318             : 
     319             :     /** Return the maximum number of characters possible
     320             : 
     321             :         This represents the largest number of
     322             :         characters that are possible in a url,
     323             :         not including any null terminator.
     324             : 
     325             :         @par Complexity
     326             :         Constant.
     327             : 
     328             :         @par Exception Safety
     329             :         Throws nothing.
     330             :     */
     331             :     static
     332             :     constexpr
     333             :     std::size_t
     334             :     max_size() noexcept
     335             :     {
     336             :         return BOOST_URL_MAX_SIZE;
     337             :     }
     338             : };
     339             : 
     340             : } // urls
     341             : } // boost
     342             : 
     343             : //------------------------------------------------
     344             : 
     345             : // std::hash specialization
     346             : #ifndef BOOST_URL_DOCS
     347             : namespace std {
     348             : template<>
     349             : struct hash< ::boost::urls::url_view >
     350             : {
     351             :     hash() = default;
     352             :     hash(hash const&) = default;
     353             :     hash& operator=(hash const&) = default;
     354             : 
     355             :     explicit
     356          69 :     hash(std::size_t salt) noexcept
     357          69 :         : salt_(salt)
     358             :     {
     359          69 :     }
     360             : 
     361             :     std::size_t
     362         276 :     operator()(::boost::urls::url_view const& u) const noexcept
     363             :     {
     364         276 :         return u.digest(salt_);
     365             :     }
     366             : 
     367             : private:
     368             :     std::size_t salt_ = 0;
     369             : };
     370             : } // std
     371             : #endif
     372             : 
     373             : #endif