mirror of
https://github.com/matrix-construct/construct
synced 2024-12-29 00:44:17 +01:00
92 lines
2.6 KiB
C++
92 lines
2.6 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_UTIL_H
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// This section contains utilities which are useful other parts of ircd::json
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// or developers directly. This interface itself (though not its definition)
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// has little dependence on other headers in ircd::json. In contrast, a suite
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// of rich developer tools which depend on various assets in ircd::json are
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// found in tool.h instead.
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namespace ircd::json
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{
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template<size_t SIZE> struct buffer;
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using name_hash_t = size_t;
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constexpr name_hash_t name_hash(const string_view name) noexcept;
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constexpr name_hash_t operator ""_(const char *const name, const size_t len) noexcept;
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size_t serialized(const string_view &);
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string_view stringify(mutable_buffer &, const string_view &);
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template<class... T> size_t print(const mutable_buffer &buf, T&&... t);
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// Validate JSON - checks if valid JSON (not canonical).
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bool valid(const string_view &, std::nothrow_t) noexcept;
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void valid(const string_view &);
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std::string why(const string_view &);
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// (Internal) validates output
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void valid_output(const string_view &, const size_t &expected);
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}
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/// Alternative to `json::strung` which uses a fixed array rather than an
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/// allocated string as the target.
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template<size_t SIZE>
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struct ircd::json::buffer
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:string_view
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{
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std::array<char, SIZE> b;
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template<class... T>
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buffer(T&&... t)
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:string_view{stringify(b, std::forward<T>(t)...)}
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{}
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};
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/// Convenience template using the syntax print(mutable_buffer, ...)
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/// which stringifies with null termination into buffer.
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///
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template<class... T>
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size_t
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ircd::json::print(const mutable_buffer &buf,
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T&&... t)
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{
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if(unlikely(!size(buf)))
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return 0;
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mutable_buffer out
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{
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data(buf), size(buf) - 1
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};
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const auto sv
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{
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stringify(out, std::forward<T>(t)...)
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};
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buf[sv.size()] = '\0';
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valid_output(sv, size(sv)); // no size expectation check
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return sv.size();
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}
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constexpr ircd::json::name_hash_t
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ircd::json::operator ""_(const char *const text, const size_t len)
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noexcept
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{
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return name_hash(string_view(text, len));
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}
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constexpr ircd::json::name_hash_t
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ircd::json::name_hash(const string_view name)
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noexcept
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{
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return ircd::hash(name);
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}
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