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314 lines
8.5 KiB
C++
314 lines
8.5 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_UTILITY_PROPERTYSTREAM_H_INCLUDED
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#define BEAST_UTILITY_PROPERTYSTREAM_H_INCLUDED
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#include "../CStdInt.h"
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#include "../Uncopyable.h"
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#include "../intrusive/List.h"
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#include "../threads/SharedData.h"
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#include <sstream>
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#include <string>
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#include <utility>
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namespace beast {
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//------------------------------------------------------------------------------
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/** Abstract stream with RAII containers that produce a property tree. */
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class PropertyStream
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{
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public:
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class Map;
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class Set;
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class Source;
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PropertyStream ();
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virtual ~PropertyStream ();
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protected:
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virtual void map_begin () = 0;
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virtual void map_begin (std::string const& key) = 0;
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virtual void map_end () = 0;
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virtual void add (std::string const& key, std::string const& value) = 0;
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template <typename Value>
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void lexical_add (std::string const &key, Value value)
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{
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std::stringstream ss;
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ss << value;
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add (key, ss.str());
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}
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virtual void add (std::string const& key, int32 value);
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virtual void add (std::string const& key, uint32 value);
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virtual void add (std::string const& key, int64 value);
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virtual void add (std::string const& key, uint64 value);
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virtual void array_begin () = 0;
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virtual void array_begin (std::string const& key) = 0;
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virtual void array_end () = 0;
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virtual void add (std::string const& value) = 0;
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template <typename Value>
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void lexical_add (Value value)
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{
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std::stringstream ss;
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ss << value;
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add (ss.str());
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}
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virtual void add ( int32 value);
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virtual void add (uint32 value);
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virtual void add ( int64 value);
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virtual void add (uint64 value);
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private:
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class Item;
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class Proxy;
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};
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//------------------------------------------------------------------------------
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//
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// Item
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//
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//------------------------------------------------------------------------------
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class PropertyStream::Item : public List <Item>::Node
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{
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public:
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explicit Item (Source* source);
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Source& source() const;
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Source* operator-> () const;
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Source& operator* () const;
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private:
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Source* m_source;
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};
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//------------------------------------------------------------------------------
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//
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// Proxy
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//
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//------------------------------------------------------------------------------
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class PropertyStream::Proxy
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{
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private:
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Map const* m_map;
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std::string m_key;
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std::ostringstream mutable m_ostream;
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public:
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Proxy (Map const& map, std::string const& key);
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Proxy (Proxy const& other);
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~Proxy ();
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template <typename Value>
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Proxy& operator= (Value value);
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std::ostream& operator<< (std::ostream& manip (std::ostream&)) const;
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template <typename T>
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std::ostream& operator<< (T const& t) const
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{
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return m_ostream << t;
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}
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};
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//------------------------------------------------------------------------------
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//
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// Map
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//
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//------------------------------------------------------------------------------
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class PropertyStream::Map : public Uncopyable
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{
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private:
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PropertyStream& m_stream;
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public:
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explicit Map (PropertyStream& stream);
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explicit Map (Set& parent);
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Map (std::string const& key, Map& parent);
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Map (std::string const& key, PropertyStream& stream);
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~Map ();
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PropertyStream& stream();
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PropertyStream const& stream() const;
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template <typename Value>
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void add (std::string const& key, Value value) const
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{
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m_stream.add (key, value);
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}
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template <typename Key, typename Value>
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void add (Key key, Value value) const
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{
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std::stringstream ss;
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ss << key;
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add (ss.str(), value);
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}
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Proxy operator[] (std::string const& key);
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Proxy operator[] (char const* key)
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{ return Proxy (*this, key); }
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template <typename Key>
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Proxy operator[] (Key key) const
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{
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std::stringstream ss;
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ss << key;
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return Proxy (*this, ss.str());
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}
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};
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//--------------------------------------------------------------------------
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template <typename Value>
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PropertyStream::Proxy& PropertyStream::Proxy::operator= (Value value)
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{
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m_map->add (m_key, value);
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return *this;
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}
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//--------------------------------------------------------------------------
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//
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// Set
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//
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//------------------------------------------------------------------------------
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class PropertyStream::Set : public Uncopyable
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{
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private:
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PropertyStream& m_stream;
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public:
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explicit Set (Set& set);
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Set (std::string const& key, Map& map);
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Set (std::string const& key, PropertyStream& stream);
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~Set ();
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PropertyStream& stream();
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PropertyStream const& stream() const;
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template <typename Value>
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void add (Value value) const
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{ m_stream.add (value); }
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};
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//------------------------------------------------------------------------------
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//
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// Source
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//
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//------------------------------------------------------------------------------
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/** Subclasses can be called to write to a stream and have children. */
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class PropertyStream::Source : public Uncopyable
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{
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private:
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struct State
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{
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explicit State (Source* source)
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: item (source)
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, parent (nullptr)
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{ }
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Item item;
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Source* parent;
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List <Item> children;
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};
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typedef SharedData <State> SharedState;
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std::string const m_name;
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SharedState m_state;
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//--------------------------------------------------------------------------
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void remove (SharedState::Access& state,
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SharedState::Access& childState);
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void removeAll (SharedState::Access& state);
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void write (SharedState::Access& state, PropertyStream& stream);
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public:
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explicit Source (std::string const& name);
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~Source ();
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/** Returns the name of this source. */
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std::string const& name() const;
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/** Add a child source. */
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void add (Source& source);
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/** Add a child source by pointer.
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The source pointer is returned so it can be used in ctor-initializers.
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*/
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template <class Derived>
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Derived* add (Derived* child)
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{
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add (*static_cast <Source*>(child));
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return child;
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}
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/** Remove a child source from this Source. */
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void remove (Source& child);
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/** Remove all child sources of this Source. */
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void removeAll ();
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/** Write only this Source to the stream. */
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void write_one (PropertyStream& stream);
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/** write this source and all its children recursively to the stream. */
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void write (PropertyStream& stream);
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/** Parse the path and write the corresponding Source and optional children.
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If the source is found, it is written. If the wildcard character '*'
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exists as the last character in the path, then all the children are
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written recursively.
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*/
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void write (PropertyStream& stream, std::string const& path);
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/** Parse the dot-delimited Source path and return the result.
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The first value will be a pointer to the Source object corresponding
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to the given path. If no Source object exists, then the first value
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will be nullptr and the second value will be undefined.
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The second value is a boolean indicating whether or not the path string
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specifies the wildcard character '*' as the last character.
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*/
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std::pair <Source*, bool> find (std::string const& path);
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//--------------------------------------------------------------------------
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/** Subclass override.
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The default version does nothing.
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*/
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virtual void onWrite (Map&);
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};
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}
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#endif
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