mirror of
https://github.com/matrix-construct/construct
synced 2024-07-01 00:08:22 +02:00
112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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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 is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_JSON_ARRAY_H
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namespace ircd::json
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{
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struct array;
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bool empty(const array &);
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bool operator!(const array &);
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size_t size(const array &);
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size_t serialized(const string_view *const &begin, const string_view *const &end);
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size_t serialized(const std::string *const &begin, const std::string *const &end);
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size_t serialized(const array &);
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string_view stringify(mutable_buffer &buf, const string_view *const &begin, const string_view *const &end);
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string_view stringify(mutable_buffer &buf, const std::string *const &begin, const std::string *const &end);
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string_view stringify(mutable_buffer &, const array &);
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std::ostream &operator<<(std::ostream &, const array &);
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}
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/// Lightweight interface to a JSON array string.
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///
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/// This object accepts queries with numerical indexing. The same parsing
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/// approach is used in ircd::json::object and that is important to note here:
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/// iterating this array by incrementing your own numerical index and making
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/// calls into this object is NOT efficient. Simply put, do not do something
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/// like `for(int x=0; x<array.count(); x++) array.at(x)` as that will parse
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/// the array from the beginning on every single increment. Instead, use the
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/// provided iterator object.
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///
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struct ircd::json::array
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:string_view
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{
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struct const_iterator;
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using value_type = const string_view;
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using pointer = value_type *;
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using reference = value_type &;
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using iterator = const_iterator;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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static const uint max_recursion_depth;
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const_iterator end() const;
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const_iterator begin() const;
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const_iterator find(size_t i) const;
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bool empty() const;
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size_t count() const;
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size_t size() const;
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template<class T> T at(const size_t &i) const;
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string_view at(const size_t &i) const;
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string_view operator[](const size_t &i) const;
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explicit operator std::string() const;
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using string_view::string_view;
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template<class it> static size_t serialized(const it &b, const it &e);
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template<class it> static string_view stringify(mutable_buffer &, const it &b, const it &e);
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};
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#include "array_iterator.h"
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template<class T>
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inline T
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ircd::json::array::at(const size_t &i)
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const try
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{
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return lex_cast<T>(at(i));
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}
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catch(const bad_lex_cast &e)
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{
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throw type_error
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{
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"indice %zu must cast to type %s", i, typeid(T).name()
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};
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}
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inline ircd::json::array::const_iterator
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ircd::json::array::end()
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const
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{
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return { string_view::end(), string_view::end() };
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}
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inline bool
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ircd::json::array::empty()
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const
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{
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const string_view &sv{*this};
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// Allow empty objects '{}' to pass this assertion; this function is not
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// a type-check. Some serializers (like browser JS) might give an empty
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// object before it has any context that the set is an array; it doesn't
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// matter here for us.
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assert(sv.size() > 2 || sv.empty() || sv == empty_array || sv == empty_object);
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return sv.size() <= 2;
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}
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