383 lines
14 KiB
C++
383 lines
14 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010-2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_JSON_TREE_HPP
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#define __UTIL_JSON_TREE_HPP
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#include "flat.hpp"
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#include "fwd.hpp"
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#include "../iterator.hpp"
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#include "../view.hpp"
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#include <iosfwd>
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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#include <experimental/filesystem>
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///////////////////////////////////////////////////////////////////////////////
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namespace json::tree {
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enum type_t {
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OBJECT,
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ARRAY,
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STRING,
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NUMBER,
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BOOLEAN,
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NONE
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};
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/// Parse an encoded form of JSON into a tree structure
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template <typename T>
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std::unique_ptr<node>
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parse (const util::view<T> &data);
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std::unique_ptr<node>
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parse (const std::experimental::filesystem::path &);
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extern void write (const json::tree::node&, std::ostream&);
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/// Abstract base for all JSON values
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class node {
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public:
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node (const node&) = delete;
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virtual ~node () { ; }
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virtual std::unique_ptr<node> clone (void) const = 0;
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virtual const object& as_object (void) const&;
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virtual const array& as_array (void) const&;
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virtual const string& as_string (void) const&;
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virtual const number& as_number (void) const&;
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virtual const boolean& as_boolean (void) const&;
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virtual const null& as_null (void) const&;
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virtual object& as_object (void)&;
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virtual array& as_array (void)&;
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virtual string& as_string (void)&;
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virtual number& as_number (void)&;
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virtual boolean& as_boolean (void)&;
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virtual null& as_null (void)&;
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// we don't provide operators for conversion due to ambiguities
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// introduced when using indexing operators with pointer
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// arguments.
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virtual bool as_bool (void) const;
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virtual float as_float (void) const;
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virtual double as_double (void) const;
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virtual intmax_t as_sint (void) const;
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virtual uintmax_t as_uint (void) const;
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virtual const char* as_chars (void) const&;
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template <typename T>
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T as (void) const;
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virtual bool is_object (void) const { return false; }
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virtual bool is_array (void) const { return false; }
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virtual bool is_string (void) const { return false; }
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virtual bool is_number (void) const { return false; }
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virtual bool is_integer (void) const { return false; }
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virtual bool is_boolean (void) const { return false; }
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virtual bool is_null (void) const { return false; }
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virtual type_t type (void) const = 0;
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virtual bool operator==(const node &rhs) const = 0;
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virtual bool operator!=(const node &rhs) const;
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virtual bool operator==(const object &) const { return false; }
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virtual bool operator==(const array &) const { return false; }
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virtual bool operator==(const string &) const { return false; }
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virtual bool operator==(const number &) const { return false; }
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virtual bool operator==(const boolean &) const { return false; }
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virtual bool operator==(const null &) const { return false; }
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virtual bool operator==(const char *rhs) const;
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virtual bool operator!=(const char *rhs) const { return !(*this == rhs); }
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virtual node& operator[] (const std::string&)&;
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virtual node& operator[] (size_t)&;
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virtual const node& operator[] (const std::string&) const&;
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virtual const node& operator[] (size_t) const&;
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virtual std::ostream& write (std::ostream &os) const = 0;
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protected:
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node () = default;
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};
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/// Represents a JSON object, and contains its children.
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class object final : public node {
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private:
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using value_store = std::map<std::string, std::unique_ptr<node>>;
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public:
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typedef value_store::iterator iterator;
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typedef value_store::const_iterator const_iterator;
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public:
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virtual ~object ();
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virtual std::unique_ptr<node> clone (void) const override;
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virtual const object& as_object (void) const& override { return *this; }
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virtual object& as_object (void) & override { return *this; }
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virtual bool is_object (void) const override { return true; }
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virtual type_t type (void) const override { return OBJECT; }
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virtual bool operator==(const object &rhs) const override;
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virtual bool operator==(const node &rhs) const override
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{ return rhs == *this; }
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virtual void insert (const std::string &key, std::unique_ptr<node>&& value);
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virtual const node& operator[] (const std::string &key) const& override;
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virtual node& operator[] (const std::string &key)& override;
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virtual bool has (const std::string&) const;
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virtual const_iterator find (const std::string&) const;
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virtual const_iterator begin (void) const;
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virtual const_iterator end (void) const;
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virtual const_iterator cbegin (void) const { return begin (); }
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virtual const_iterator cend (void) const { return end (); }
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virtual size_t size (void) const;
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virtual void clear (void);
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virtual void erase (const std::string &key);
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virtual std::ostream& write (std::ostream &os) const override;
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private:
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value_store m_values;
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};
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/// Represents a JSON array, and contains its children.
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class array final : public node {
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protected:
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typedef std::vector<std::unique_ptr<node>>::iterator pointer_array_iterator;
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typedef std::vector<std::unique_ptr<node>>::const_iterator const_pointer_array_iterator;
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public:
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typedef referencing_iterator<pointer_array_iterator> iterator;
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typedef referencing_iterator<const_pointer_array_iterator> const_iterator;
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protected:
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std::vector<std::unique_ptr<node>> m_values;
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public:
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virtual ~array();
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virtual std::unique_ptr<node> clone (void) const override;
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virtual const array& as_array (void) const& override { return *this; }
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virtual array& as_array (void) & override { return *this; }
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virtual bool is_array (void) const override { return true; }
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virtual type_t type (void) const override { return ARRAY; }
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virtual bool operator==(const array &rhs) const override;
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virtual bool operator==(const node &rhs) const override;
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virtual size_t size (void) const;
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virtual node& operator[] (size_t idx)& override;
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virtual const node& operator[] (size_t idx) const& override;
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virtual iterator begin (void);
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virtual iterator end (void);
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virtual const_iterator begin (void) const;
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virtual const_iterator end (void) const;
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virtual const_iterator cbegin (void) const;
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virtual const_iterator cend (void) const;
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virtual void insert (std::unique_ptr<json::tree::node> &&_value);
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virtual std::ostream& write (std::ostream &os) const override;
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};
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/// Represents a JSON string literal.
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class string final : public node {
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protected:
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std::string m_value;
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public:
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template <typename T>
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string (T first, T last): m_value (first, last) { ; }
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explicit string (const std::string &_value): m_value (_value) { ; }
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explicit string (const char *_value): m_value (_value) { ; }
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string (const char *_first, const char *_last): m_value (_first, _last) { ; }
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virtual std::unique_ptr<node> clone (void) const override;
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virtual const string& as_string (void) const& override { return *this; }
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virtual string& as_string (void) & override { return *this; }
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virtual bool is_string (void) const override { return true; }
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virtual type_t type (void) const override { return STRING; }
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virtual bool operator==(const char *rhs) const override;
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virtual bool operator==(const string &rhs) const override;
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virtual bool operator==(const std::string &rhs) const;
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virtual bool operator==(const node &rhs) const override
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{ return rhs == *this; }
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virtual bool operator!= (const std::string &rhs) const { return !(*this == rhs); }
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virtual size_t size (void) const { return m_value.size (); }
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operator const std::string&(void) const { return m_value; }
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const std::string& native (void) const { return m_value; }
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virtual std::ostream& write (std::ostream &os) const override;
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};
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/// Represents a JSON integer/float literal.
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class number final : public node {
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public:
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enum repr_t {
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REAL,
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SINT,
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UINT
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};
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using real_t = double;
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using sint_t = intmax_t;
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using uint_t = uintmax_t;
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explicit number (real_t _value): m_repr (REAL) { m_value.r = _value; }
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explicit number (sint_t _value): m_repr (SINT) { m_value.s = _value; }
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explicit number (uint_t _value): m_repr (UINT) { m_value.u = _value; }
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virtual std::unique_ptr<node> clone (void) const override;
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virtual const number& as_number (void) const& override { return *this; }
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virtual number& as_number (void) & override { return *this; }
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virtual bool is_number (void) const override { return true; }
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virtual bool is_integer (void) const override { return repr () == UINT || repr () == SINT; }
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virtual type_t type (void) const override { return NUMBER; }
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virtual repr_t repr (void) const { return m_repr; }
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virtual bool operator==(const number &rhs) const override;
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virtual bool operator==(const node &rhs) const override
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{ return rhs == *this; }
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operator real_t (void) const;
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operator sint_t (void) const;
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operator uint_t (void) const;
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real_t real (void) const;
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sint_t sint (void) const;
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uint_t uint (void) const;
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virtual std::ostream& write (std::ostream &os) const override;
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private:
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union {
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real_t r;
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sint_t s;
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uint_t u;
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} m_value;
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repr_t m_repr;
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};
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/// Represents a JSON boolean literal.
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class boolean final : public node {
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protected:
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bool m_value;
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public:
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explicit boolean (bool _value): m_value (_value) { ; }
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virtual std::unique_ptr<node> clone (void) const override;
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virtual const boolean& as_boolean (void) const& override { return *this; }
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virtual boolean& as_boolean (void) & override { return *this; }
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virtual bool is_boolean (void) const override { return true; }
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virtual type_t type (void) const override { return BOOLEAN; }
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virtual bool operator==(const boolean &rhs) const override;
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virtual bool operator==(const node &rhs) const override
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{ return rhs == *this; }
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operator bool (void) const { return m_value; }
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bool native (void) const { return m_value; }
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virtual std::ostream& write (std::ostream &os) const override;
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};
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/// Represents a JSON null value.
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class null final : public node {
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public:
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virtual type_t type (void) const override { return NONE; }
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virtual std::unique_ptr<node> clone (void) const override;
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virtual bool operator==(const null&) const override { return true; }
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virtual bool operator==(const node &rhs) const override
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{ return rhs == *this; }
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virtual const null& as_null (void) const& override { return *this; }
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virtual null& as_null (void) & override { return *this; }
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virtual bool is_null (void) const override { return true; }
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virtual std::ostream& write (std::ostream &os) const override;
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};
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std::ostream&
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operator <<(std::ostream &os, const json::tree::node &n);
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// Instantiate this template for the type you wish to output. We use a
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// helper class here to avoid partial template specialisation of a
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// function (eg, for templated types).
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template <typename T>
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struct io {
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static std::unique_ptr<json::tree::node> serialise (const T&);
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static T deserialise (const json::tree::node&);
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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template <typename T, class ...Args>
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std::unique_ptr<json::tree::node>
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to_json (const T &t, Args&&... args)
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{
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return json::tree::io<T>::serialise (
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t, std::forward<Args>(args)...
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);
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}
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///////////////////////////////////////////////////////////////////////////////
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template <typename T, class ...Args>
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T
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from_json (const json::tree::node &n, Args&&... args)
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{
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return json::tree::io<T>::deserialise (
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n, std::forward<Args>(args)...
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);
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}
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#endif
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