mirror of
https://github.com/matrix-construct/construct
synced 2024-11-04 12:58:53 +01:00
66 lines
2 KiB
C++
66 lines
2 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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_UTF_H
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/// Unicode Transformation Format
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namespace ircd::utf
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{
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IRCD_EXCEPTION(ircd::error, error)
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}
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/// Unicode Transformation Format (8-bit)
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namespace ircd::utf8
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{
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// Get the utf8-encoded length from char32_t (decoded) codepoints
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template<class u32xN> u32xN length(const u32xN codepoints) noexcept;
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// Encode char32_t codepoints into respective utf-8 encodings
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template<class u32xN> u32xN encode(const u32xN codepoints) noexcept;
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// Decode utf-8 string into char32_t unicode codepoints
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u32x16 decode(const u8x16 string) noexcept;
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}
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/// Unicode Transformation Format (16-bit)
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namespace ircd::utf16
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{
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// mask all surrogate characters from find_() result
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template<class u8xN> u8xN mask_surrogate(const u8xN found) noexcept;
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// scan for utf-16 surrogates
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template<class u8xN> u8xN find_surrogate(const u8xN input) noexcept;
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// scan for utf-16 surrogates including incomplete sequences truncated
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u8x16 find_surrogate_partial(const u8x16 input) noexcept;
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// decodes one or two surrogates at the front into one or two codepoints
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u32x4 decode_surrogate_aligned_next(const u8x16 input) noexcept;
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}
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/// The vector returned by find_surrogate() masks the leading character of
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/// every valid surrogate (i.e. the '\'). This is a convenience to mask
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/// the full surrogate from such a result.
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template<class u8xN>
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inline u8xN
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ircd::utf16::mask_surrogate(const u8xN found)
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noexcept
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{
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return u8xN
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{
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shl<0x08>(found) |
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shl<0x10>(found) |
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shl<0x18>(found) |
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shl<0x20>(found) |
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shl<0x28>(found) |
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found
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};
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}
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