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3rdparty/boost_1_81_0/boost/url/params_ref.hpp 22.3 KB
0b6a182c   Hu Chunming   添加无鉴权注册和注销
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  //
  // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
  // Copyright (c) 2022 Alan de Freitas (alandefreitas@gmail.com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  // Official repository: https://github.com/boostorg/url
  //
  
  #ifndef BOOST_URL_PARAMS_REF_HPP
  #define BOOST_URL_PARAMS_REF_HPP
  
  #include <boost/url/detail/config.hpp>
  #include <boost/url/ignore_case.hpp>
  #include <boost/url/params_base.hpp>
  #include <initializer_list>
  #include <iterator>
  
  namespace boost {
  namespace urls {
  
  #ifndef BOOST_URL_DOCS
  class url_base;
  class params_view;
  #endif
  
  /** A view representing query parameters in a URL
  
      Objects of this type are used to interpret
      the query parameters as a bidirectional view
      of key/value pairs.
      The view does not retain ownership of the
      elements and instead references the original
      url. The caller is responsible for ensuring
      that the lifetime of the referenced url
      extends until it is no longer referenced.
      The view is modifiable; calling non-const
      members causes changes to the referenced
      url.
  
      <br>
  
      Percent escapes in strings returned when
      dereferencing iterators are automatically
      decoded.
      Reserved characters in strings supplied
      to modifier functions are automatically
      percent-escaped.
  
      @par Example
      @code
      url u( "?first=John&last=Doe" );
  
      params_ref p = u.params();
      @endcode
  
      @par Iterator Invalidation
      Changes to the underlying character buffer
      can invalidate iterators which reference it.
      Modifications made through the container
      invalidate some or all iterators:
      <br>
  
      @li @ref append : Only `end()`.
  
      @li @ref assign, @ref clear,
          `operator=` : All elements.
  
      @li @ref erase : Erased elements and all
          elements after (including `end()`).
  
      @li @ref insert : All elements at or after
          the insertion point (including `end()`).
  
      @li @ref replace, @ref set : Modified
          elements and all elements
          after (including `end()`).
  */
  class params_ref
      : public params_base
  {
      friend class url_base;
  
      url_base* u_ = nullptr;
  
      params_ref(
          url_base& u,
          encoding_opts opt) noexcept;
  
  public:
      //--------------------------------------------
      //
      // Special Members
      //
      //--------------------------------------------
  
      /** Constructor
  
          After construction, both views
          reference the same url. Ownership is not
          transferred; the caller is responsible
          for ensuring the lifetime of the url
          extends until it is no longer
          referenced.
  
          @par Postconditions
          @code
          &this->url() == &other.url()
          @endcode
  
          @par Complexity
          Constant.
  
          @par Exception Safety
          Throws nothing.
  
          @param other The other view.
      */
      params_ref(
          params_ref const& other) = default;
  
      /** Constructor
  
          After construction, both views will
          reference the same url but this
          instance will use the specified
          @ref encoding_opts when the values
          are decoded.
  
          Ownership is not transferred; the
          caller is responsible for ensuring
          the lifetime of the url extends
          until it is no longer referenced.
  
          @par Postconditions
          @code
          &this->url() == &other.url()
          @endcode
  
          @par Complexity
          Constant.
  
          @par Exception Safety
          Throws nothing.
  
          @param other The other view.
          @param opt The options for decoding. If
          this parameter is omitted, `space_as_plus`
          is used.
  
      */
      params_ref(
          params_ref const& other,
          encoding_opts opt) noexcept;
  
      /** Assignment
  
          The previous contents of this are
          replaced by the contents of `other.
  
          <br>
          All iterators are invalidated.
  
          @note
          The strings referenced by `other`
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Effects
          @code
          this->assign( other.begin(), other.end() );
          @endcode
  
          @par Complexity
          Linear in `other.buffer().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @param other The params to assign.
      */
      BOOST_URL_DECL
      params_ref&
      operator=(
          params_ref const& other);
  
      /** Assignment
  
          After assignment, the previous contents
          of the query parameters are replaced by
          the contents of the initializer-list.
  
          @par Preconditions
          None of character buffers referenced by
          `init` may overlap the character buffer of
          the underlying url, or else the behavior
          is undefined.
  
          @par Effects
          @code
          this->assign( init );
          @endcode
  
          @par Complexity
          Linear in `init.size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @param init The list of params to assign.
      */
      params_ref&
      operator=(
          std::initializer_list<
              param_view> init);
  
      /** Conversion
      */
      BOOST_URL_DECL
      operator
      params_view() const noexcept;
  
      //--------------------------------------------
      //
      // Observers
      //
      //--------------------------------------------
  
      /** Return the referenced url
  
          This function returns the url referenced
          by the view.
  
          @par Example
          @code
          url u( "?key=value" );
  
          assert( &u.segments().url() == &u );
          @endcode
  
          @par Exception Safety
          @code
          Throws nothing.
          @endcode
      */
      url_base&
      url() const noexcept
      {
          return *u_;
      }
  
      //--------------------------------------------
      //
      // Modifiers
      //
      //--------------------------------------------
  
      /** Clear the contents of the container
  
          <br>
          All iterators are invalidated.
  
          @par Effects
          @code
          this->url().remove_query();
          @endcode
  
          @par Postconditions
          @code
          this->empty() == true && this->url().has_query() == false
          @endcode
  
          @par Complexity
          Constant.
  
          @par Exception Safety
          Throws nothing.
      */
      void
      clear() noexcept;
  
      //--------------------------------------------
  
      /** Assign elements
  
          This function replaces the entire
          contents of the view with the params
          in the <em>initializer-list</em>.
  
          <br>
          All iterators are invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Example
          @code
          url u;
  
          u.params().assign( {{ "first", "John" }, { "last", "Doe" }} );
          @endcode
  
          @par Complexity
          Linear in `init.size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @param init The list of params to assign.
      */
      BOOST_URL_DECL
      void
      assign(
          std::initializer_list<
              param_view> init);
  
      /** Assign elements
  
          This function replaces the entire
          contents of the view with the params
          in the range.
  
          <br>
          All iterators are invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Mandates
          @code
          std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_view >::value == true
          @endcode
  
          @par Complexity
          Linear in the size of the range.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @param first, last The range of params
          to assign.
      */
      template<class FwdIt>
      void
      assign(FwdIt first, FwdIt last);
  
      //--------------------------------------------
  
      /** Append elements
  
          This function appends a param to the view.
  
          <br>
          The `end()` iterator is invalidated.
  
          @par Example
          @code
          url u;
  
          u.params().append( { "first", "John" } );
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the new element.
  
          @param p The param to append.
      */
      iterator
      append(
          param_view const& p);
  
      /** Append elements
  
          This function appends the params in
          an <em>initializer-list</em> to the view.
  
          <br>
          The `end()` iterator is invalidated.
  
          @par Example
          @code
          url u;
  
          u.params().append({ { "first", "John" }, { "last", "Doe" } });
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the first new element.
  
          @param init The list of params to append.
      */
      iterator
      append(
          std::initializer_list<
              param_view> init);
  
      /** Append elements
  
          This function appends a range of params
          to the view.
  
          <br>
          The `end()` iterator is invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Mandates
          @code
          std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_view >::value == true
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the first new element.
  
          @param first, last The range of params
          to append.
      */
      template<class FwdIt>
      iterator
      append(
          FwdIt first, FwdIt last);
  
      //--------------------------------------------
  
      /** Insert elements
  
          This function inserts a param
          before the specified position.
  
          <br>
          All iterators that are equal to
          `before` or come after are invalidated.
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the inserted
          element.
  
          @param before An iterator before which
          the param is inserted. This may
          be equal to `end()`.
  
          @param p The param to insert.
      */
      BOOST_URL_DECL
      iterator
      insert(
          iterator before,
          param_view const& p);
  
      /** Insert elements
  
          This function inserts the params in
          an <em>initializer-list</em> before
          the specified position.
  
          <br>
          All iterators that are equal to
          `before` or come after are invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the first
          element inserted, or `before` if
          `init.size() == 0`.
  
          @param before An iterator before which
          the element is inserted. This may
          be equal to `end()`.
  
          @param init The list of params to insert.
      */
      BOOST_URL_DECL
      iterator
      insert(
          iterator before,
          std::initializer_list<
              param_view> init);
  
      /** Insert elements
  
          This function inserts a range of
          params before the specified position.
  
          <br>
          All iterators that are equal to
          `before` or come after are invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Mandates
          @code
          std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_view >::value == true
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the first
          element inserted, or `before` if
          `first == last`.
  
          @param before An iterator before which
          the element is inserted. This may
          be equal to `end()`.
  
          @param first, last The range of params
          to insert.
      */
      template<class FwdIt>
      iterator
      insert(
          iterator before,
          FwdIt first,
          FwdIt last);
  
      //--------------------------------------------
  
      /** Erase elements
  
          This function removes an element from
          the container.
  
          <br>
          All iterators that are equal to
          `pos` or come after are invalidated.
  
          @par Example
          @code
          url u( "?first=John&last=Doe" );
  
          params_ref::iterator it = u.params().erase( u.params().begin() );
  
          assert( u.encoded_query() == "last=Doe" );
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Throws nothing.
  
          @return An iterator to one past
          the removed element.
  
          @param pos An iterator to the element.
      */
      iterator
      erase(iterator pos) noexcept;
  
      /** Erase elements
  
          This function removes a range of elements
          from the container.
  
          <br>
          All iterators that are equal to
          `first` or come after are invalidated.
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Throws nothing.
  
          @return An iterator to one past
          the removed range.
  
          @param first, last The range of
          elements to erase.
      */
      iterator
      erase(
          iterator first,
          iterator last) noexcept;
  
      /** Erase elements
  
          <br>
          All iterators are invalidated.
  
          @par Postconditions
          @code
          this->count( key, ic ) == 0
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Throws nothing.
  
          @return The number of elements removed
          from the container.
  
          @param key The key to match.
          By default, a case-sensitive
          comparison is used.
  
          @param ic An optional parameter. If
          the value @ref ignore_case is passed
          here, the comparison is
          case-insensitive.
      */
      BOOST_URL_DECL
      std::size_t
      erase(
          string_view key,
          ignore_case_param ic = {}) noexcept;
  
      //--------------------------------------------
  
      /** Replace elements
  
          This function replaces the contents
          of the element at `pos` with the
          specified param.
  
          <br>
          All iterators that are equal to
          `pos` or come after are invalidated.
  
          @par Example
          @code
          url u( "?first=John&last=Doe" );
  
          u.params().replace( u.params().begin(), { "title", "Mr" });
  
          assert( u.encoded_query() == "title=Mr&last=Doe" );
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the element.
  
          @param pos An iterator to the element.
  
          @param p The param to assign.
      */
      BOOST_URL_DECL
      iterator
      replace(
          iterator pos,
          param_view const& p);
  
      /** Replace elements
  
          This function replaces a range of
          elements with the params in an
          <em>initializer-list</em>.
  
          <br>
          All iterators that are equal to
          `from` or come after are invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the first
          element inserted, or one past `to` if
          `init.size() == 0`.
  
          @param from,to The range of elements
          to replace.
  
          @param init The list of params to assign.
      */
      BOOST_URL_DECL
      iterator
      replace(
          iterator from,
          iterator to,
          std::initializer_list<
              param_view> init);
  
      /** Replace elements
  
          This function replaces a range of
          elements with a range of params.
  
          <br>
          All iterators that are equal to
          `from` or come after are invalidated.
  
          @note
          The strings referenced by the inputs
          must not come from the underlying url,
          or else the behavior is undefined.
  
          @par Mandates
          @code
          std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_view >::value == true
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the first
          element inserted, or one past `to` if
          `first == last`.
  
          @param from,to The range of elements to
          replace.
  
          @param first, last The range of params
          to assign.
      */
      template<class FwdIt>
      iterator
      replace(
          iterator from,
          iterator to,
          FwdIt first,
          FwdIt last);
  
      //--------------------------------------------
  
      /** Remove the value on an element
  
          This function removes the value of
          an element at the specified position.
          After the call returns, `has_value`
          for the element is false.
  
          <br>
          All iterators that are equal to
          `pos` or come after are invalidated.
  
          @par Example
          @code
          url u( "?first=John&last=Doe" );
  
          u.params().unset( u.params().begin() );
  
          assert( u.encoded_query() == "first&last=Doe" );
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Throws nothing.
  
          @return An iterator to the element.
  
          @param pos An iterator to the element.
      */
      BOOST_URL_DECL
      iterator
      unset(
          iterator pos) noexcept;
  
      /** Set a value
  
          This function replaces the value of an
          element at the specified position.
  
          <br>
          All iterators that are equal to
          `pos` or come after are invalidated.
  
          @par Example
          @code
          url u( "?id=42&id=69" );
  
          u.params().set( u.params().begin(), "none" );
  
          assert( u.encoded_query() == "id=none&id=69" );
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the element.
  
          @param pos An iterator to the element.
  
          @param value The value to assign. The
          empty string still counts as a value.
          That is, `has_value` for the element
          is true.
      */
      BOOST_URL_DECL
      iterator
      set(
          iterator pos,
          string_view value);
  
      /** Set a value
  
          This function performs one of two
          actions depending on the value of
          `this->contains( key, ic )`.
  
          @li If key is contained in the view
          then one of the matching elements has
          its value changed to the specified value.
          The remaining elements with a matching
          key are erased. Otherwise,
  
          @li If `key` is not contained in the
          view, then the function apppends the
          param `{ key, value }`.
  
          <br>
          All iterators are invalidated.
  
          @par Example
          @code
          url u( "?id=42&id=69" );
  
          u.params().set( "id", "none" );
  
          assert( u.params().count( "id" ) == 1 );
          @endcode
  
          @par Postconditions
          @code
          this->count( key, ic ) == 1 && this->find( key, ic )->value == value
          @endcode
  
          @par Complexity
          Linear in `this->url().encoded_query().size()`.
  
          @par Exception Safety
          Strong guarantee.
          Calls to allocate may throw.
  
          @return An iterator to the appended
          or modified element.
  
          @param key The key to match.
          By default, a case-sensitive
          comparison is used.
  
          @param value The value to assign. The
          empty string still counts as a value.
          That is, `has_value` for the element
          is true.
  
          @param ic An optional parameter. If
          the value @ref ignore_case is passed
          here, the comparison is
          case-insensitive.
      */
      BOOST_URL_DECL
      iterator
      set(
          string_view key,
          string_view value,
          ignore_case_param ic = {});
  
      //--------------------------------------------
  
  private:
      BOOST_URL_DECL
      detail::params_iter_impl
      find_impl(
          detail::params_iter_impl,
          string_view,
          ignore_case_param) const noexcept;
  
      BOOST_URL_DECL
      detail::params_iter_impl
      find_last_impl(
          detail::params_iter_impl,
          string_view,
          ignore_case_param) const noexcept;
  
      template<class FwdIt>
      void
      assign(FwdIt first, FwdIt last,
          std::forward_iterator_tag);
  
      // Doxygen cannot render ` = delete`
      template<class FwdIt>
      void
      assign(FwdIt first, FwdIt last,
          std::input_iterator_tag) = delete;
  
      template<class FwdIt>
      iterator
      insert(
          iterator before,
          FwdIt first,
          FwdIt last,
          std::forward_iterator_tag);
  
      // Doxygen cannot render ` = delete`
      template<class FwdIt>
      iterator
      insert(
          iterator before,
          FwdIt first,
          FwdIt last,
          std::input_iterator_tag) = delete;
  };
  
  } // urls
  } // boost
  
  // This is in <boost/url/url_base.hpp>
  //
  // #include <boost/url/impl/params_ref.hpp>
  
  #endif