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#include <Common/UTF8Helpers.h>
#include <Common/StringUtils/StringUtils.h>
#include <widechar_width.h>
#include <bit>
namespace DB
{
namespace UTF8
{
// based on https://bjoern.hoehrmann.de/utf-8/decoder/dfa/
// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions: The above copyright
// notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
static const UInt8 TABLE[] =
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 00..1f
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 20..3f
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 40..5f
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 60..7f
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, // s1..s2
1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, // s3..s4
1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, // s5..s6
1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // s7..s8
};
struct UTF8Decoder
{
enum
{
ACCEPT = 0,
REJECT = 1
};
UInt32 decode(UInt8 byte)
{
UInt32 type = TABLE[byte];
codepoint = (state != ACCEPT) ? (byte & 0x3fu) | (codepoint << 6) : (0xff >> type) & (byte);
state = TABLE[256 + state * 16 + type];
return state;
}
void reset()
{
state = ACCEPT;
codepoint = 0xfffdU;
}
UInt8 state {ACCEPT};
UInt32 codepoint {0};
};
static int wcwidth(wchar_t wc)
{
int width = widechar_wcwidth(wc);
switch (width)
{
case widechar_nonprint:
case widechar_combining:
case widechar_unassigned:
return 0;
case widechar_ambiguous:
case widechar_private_use:
case widechar_widened_in_9:
return 1;
default:
return width;
}
}
namespace
{
enum ComputeWidthMode
{
Width, /// Calculate and return visible width
BytesBeforLimit /// Calculate and return the maximum number of bytes when substring fits in visible width.
};
template <ComputeWidthMode mode>
size_t computeWidthImpl(const UInt8 * data, size_t size, size_t prefix, size_t limit) noexcept
{
UTF8Decoder decoder;
size_t width = 0;
size_t rollback = 0;
for (size_t i = 0; i < size; ++i)
{
/// Quickly skip regular ASCII
#if defined(__SSE2__)
const auto lower_bound = _mm_set1_epi8(32);
const auto upper_bound = _mm_set1_epi8(126);
while (i + 15 < size)
{
__m128i bytes = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&data[i]));
const uint16_t non_regular_width_mask = _mm_movemask_epi8(
_mm_or_si128(
_mm_cmplt_epi8(bytes, lower_bound),
_mm_cmpgt_epi8(bytes, upper_bound)));
if (non_regular_width_mask)
{
auto num_regular_chars = std::countr_zero(non_regular_width_mask);
width += num_regular_chars;
i += num_regular_chars;
break;
}
else
{
i += 16;
width += 16;
}
}
#endif
while (i < size && isPrintableASCII(data[i]))
{
++width;
++i;
}
/// Now i points to position in bytes after regular ASCII sequence
/// and if width > limit, then (width - limit) is the number of extra ASCII characters after width limit.
if (mode == BytesBeforLimit && width > limit)
return i - (width - limit);
switch (decoder.decode(data[i]))
{
case UTF8Decoder::REJECT:
{
decoder.reset();
// invalid sequences seem to have zero width in modern terminals
// tested in libvte-based, alacritty, urxvt and xterm
i -= rollback;
rollback = 0;
break;
}
case UTF8Decoder::ACCEPT:
{
// there are special control characters that manipulate the terminal output.
// (`0x08`, `0x09`, `0x0a`, `0x0b`, `0x0c`, `0x0d`, `0x1b`)
// Since we don't touch the original column data, there is no easy way to escape them.
// TODO: escape control characters
// TODO: multiline support for '\n'
// special treatment for '\t'
size_t next_width = width;
if (decoder.codepoint == '\t')
next_width += 8 - (prefix + width) % 8;
else
next_width += wcwidth(decoder.codepoint);
if (mode == BytesBeforLimit && next_width > limit)
return i - rollback;
width = next_width;
rollback = 0;
break;
}
// continue if we meet other values here
default:
++rollback;
}
}
// no need to handle trailing sequence as they have zero width
return (mode == BytesBeforLimit) ? size : width;
}
}
size_t computeWidth(const UInt8 * data, size_t size, size_t prefix) noexcept
{
return computeWidthImpl<Width>(data, size, prefix, 0);
}
size_t computeBytesBeforeWidth(const UInt8 * data, size_t size, size_t prefix, size_t limit) noexcept
{
return computeWidthImpl<BytesBeforLimit>(data, size, prefix, limit);
}
}
}
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