wehub-resource-sync
e7738de6d2
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113 lines
3.3 KiB
Plaintext
113 lines
3.3 KiB
Plaintext
fn __zero_std_text_is_ascii(text: Span<u8>) -> Bool {
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var index: usize = 0
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while index < std.mem.len(text) {
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if text[index] >= 128_u8 {
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return false
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}
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index = index + 1
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}
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return true
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}
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fn __zero_std_text_utf8_sequence_len(first: u8) -> usize {
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if first < 128_u8 {
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return 1
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}
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if first >= 194_u8 && first <= 223_u8 {
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return 2
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}
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if first >= 224_u8 && first <= 239_u8 {
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return 3
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}
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if first >= 240_u8 && first <= 244_u8 {
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return 4
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}
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return 0
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}
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fn __zero_std_text_is_cont(byte: u8) -> Bool {
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return byte >= 128_u8 && byte <= 191_u8
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}
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fn __zero_std_text_utf8_valid(text: Span<u8>) -> Bool {
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var index: usize = 0
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while index < std.mem.len(text) {
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let first: u8 = text[index]
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let width: usize = __zero_std_text_utf8_sequence_len(first)
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if width == 0 || index + width > std.mem.len(text) {
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return false
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}
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if width == 2 {
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if !__zero_std_text_is_cont(text[index + 1]) {
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return false
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}
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} else if width == 3 {
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let second: u8 = text[index + 1]
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if !__zero_std_text_is_cont(second) || !__zero_std_text_is_cont(text[index + 2]) {
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return false
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}
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if first == 224_u8 && second < 160_u8 {
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return false
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}
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if first == 237_u8 && second > 159_u8 {
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return false
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}
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} else if width == 4 {
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let second: u8 = text[index + 1]
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if !__zero_std_text_is_cont(second) || !__zero_std_text_is_cont(text[index + 2]) || !__zero_std_text_is_cont(text[index + 3]) {
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return false
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}
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if first == 240_u8 && second < 144_u8 {
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return false
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}
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if first == 244_u8 && second > 143_u8 {
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return false
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}
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}
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index = index + width
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}
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return true
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}
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fn __zero_std_text_utf8_len(text: Span<u8>) -> Maybe<usize> {
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var index: usize = 0
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var count: usize = 0
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while index < std.mem.len(text) {
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let first: u8 = text[index]
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let width: usize = __zero_std_text_utf8_sequence_len(first)
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if width == 0 || index + width > std.mem.len(text) {
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return null
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}
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if width == 2 {
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if !__zero_std_text_is_cont(text[index + 1]) {
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return null
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}
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} else if width == 3 {
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let second: u8 = text[index + 1]
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if !__zero_std_text_is_cont(second) || !__zero_std_text_is_cont(text[index + 2]) {
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return null
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}
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if first == 224_u8 && second < 160_u8 {
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return null
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}
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if first == 237_u8 && second > 159_u8 {
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return null
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}
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} else if width == 4 {
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let second: u8 = text[index + 1]
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if !__zero_std_text_is_cont(second) || !__zero_std_text_is_cont(text[index + 2]) || !__zero_std_text_is_cont(text[index + 3]) {
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return null
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}
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if first == 240_u8 && second < 144_u8 {
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return null
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}
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if first == 244_u8 && second > 143_u8 {
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return null
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}
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}
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index = index + width
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count = count + 1
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}
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return count
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}
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