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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module builtin
pub fn utf8_char_len(b byte) int {
return ((0xe5000000 >> ((b >> 3) & 0x1e)) & 3) + 1
}
// Convert utf32 to utf8
// utf32 == Codepoint
pub fn utf32_to_str(code u32) string {
unsafe {
mut buffer := malloc_noscan(5)
res := utf32_to_str_no_malloc(code, buffer)
if res.len == 0 {
// the buffer was not used at all
free(buffer)
}
return res
}
}
[manualfree; unsafe]
pub fn utf32_to_str_no_malloc(code u32, buf &byte) string {
unsafe {
icode := int(code) // Prevents doing casts everywhere
mut buffer := &byte(buf)
if icode <= 127 {
// 0x7F
buffer[0] = byte(icode)
buffer[1] = 0
return tos(buffer, 1)
} else if icode <= 2047 {
// 0x7FF
buffer[0] = 192 | byte(icode >> 6) // 0xC0 - 110xxxxx
buffer[1] = 128 | byte(icode & 63) // 0x80 - 0x3F - 10xxxxxx
buffer[2] = 0
return tos(buffer, 2)
} else if icode <= 65535 {
// 0xFFFF
buffer[0] = 224 | byte(icode >> 12) // 0xE0 - 1110xxxx
buffer[1] = 128 | (byte(icode >> 6) & 63) // 0x80 - 0x3F - 10xxxxxx
buffer[2] = 128 | byte(icode & 63) // 0x80 - 0x3F - 10xxxxxx
buffer[3] = 0
return tos(buffer, 3)
}
// 0x10FFFF
else if icode <= 1114111 {
buffer[0] = 240 | byte(icode >> 18) // 0xF0 - 11110xxx
buffer[1] = 128 | (byte(icode >> 12) & 63) // 0x80 - 0x3F - 10xxxxxx
buffer[2] = 128 | (byte(icode >> 6) & 63) // 0x80 - 0x3F - 10xxxxxx
buffer[3] = 128 | byte(icode & 63) // 0x80 - 0x3F - 10xxxxxx
buffer[4] = 0
return tos(buffer, 4)
}
}
return ''
}
// Convert utf8 to utf32
pub fn (_rune string) utf32_code() int {
if _rune.len == 0 {
return 0
}
// save ASC symbol as is
if _rune.len == 1 {
return int(_rune[0])
}
mut b := byte(int(_rune[0]))
// TODO should be
// res := int( rune[0] << rune.len)
b = b << _rune.len
mut res := int(b)
mut shift := 6 - _rune.len
for i := 1; i < _rune.len; i++ {
c := int(_rune[i])
res = res << shift
res |= c & 63 // 0x3f
shift = 6
}
return res
}
// Calculate length to read from the first byte
fn utf8_len(c byte) int {
mut b := 0
mut x := c
if (x & 240) != 0 {
// 0xF0
x >>= 4
} else {
b += 4
}
if (x & 12) != 0 {
// 0x0C
x >>= 2
} else {
b += 2
}
if (x & 2) == 0 {
// 0x02
b++
}
return b
}
// Calculate string length for in number of codepoints
pub fn utf8_str_len(s string) int {
mut l := 0
mut i := 0
for i < s.len {
l++
i += ((0xe5000000 >> ((unsafe { s.str[i] } >> 3) & 0x1e)) & 3) + 1
}
return l
}
// Calculate string length for formatting, i.e. number of "characters"
// This is simplified implementation. if you need specification compliant width,
// use utf8.east_asian.display_width.
pub fn utf8_str_visible_length(s string) int {
mut l := 0
mut ul := 1
for i := 0; i < s.len; i += ul {
c := unsafe { s.str[i] }
ul = ((0xe5000000 >> ((unsafe { s.str[i] } >> 3) & 0x1e)) & 3) + 1
if i + ul > s.len { // incomplete UTF-8 sequence
return l
}
l++
// avoid the match if not needed
if ul == 1 {
continue
}
// recognize combining characters and wide characters
match ul {
2 {
r := u64((u16(c) << 8) | unsafe { s.str[i + 1] })
if r >= 0xcc80 && r < 0xcdb0 {
// diacritical marks
l--
}
}
3 {
r := u64((u32(c) << 16) | unsafe { (u32(s.str[i + 1]) << 8) | s.str[i + 2] })
// diacritical marks extended
// diacritical marks supplement
// diacritical marks for symbols
if (r >= 0xe1aab0 && r <= 0xe1ac7f)
|| (r >= 0xe1b780 && r <= 0xe1b87f)
|| (r >= 0xe28390 && r <= 0xe2847f)
|| (r >= 0xefb8a0 && r <= 0xefb8af) {
// diacritical marks
l--
}
// Hangru
// CJK Unified Ideographics
// Hangru
// CJK
else if (r >= 0xe18480 && r <= 0xe1859f)
|| (r >= 0xe2ba80 && r <= 0xe2bf95)
|| (r >= 0xe38080 && r <= 0xe4b77f)
|| (r >= 0xe4b880 && r <= 0xea807f)
|| (r >= 0xeaa5a0 && r <= 0xeaa79f)
|| (r >= 0xeab080 && r <= 0xed9eaf)
|| (r >= 0xefa480 && r <= 0xefac7f)
|| (r >= 0xefb8b8 && r <= 0xefb9af) {
// half marks
l++
}
}
4 {
r := u64((u32(c) << 24) | unsafe {
(u32(s.str[i + 1]) << 16) | (u32(s.str[i + 2]) << 8) | s.str[i + 3]
})
// Enclosed Ideographic Supplement
// Emoji
// CJK Unified Ideographs Extension B-G
if (r >= 0x0f9f8880 && r <= 0xf09f8a8f)
|| (r >= 0xf09f8c80 && r <= 0xf09f9c90)
|| (r >= 0xf09fa490 && r <= 0xf09fa7af)
|| (r >= 0xf0a08080 && r <= 0xf180807f) {
l++
}
}
else {}
}
}
return l
}
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