32 lines
978 B
Rust
32 lines
978 B
Rust
pub(crate) fn hex_char_for(number: u32) -> char {
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debug_assert!(number < 0x10);
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std::char::from_u32(if number < 0xA {
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0x30 + number
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} else {
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0x61 - 0xA + number
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})
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.unwrap()
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}
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pub(crate) fn is_name(c: char) -> bool {
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is_name_start(c) || c.is_ascii_digit() || c == '-'
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}
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pub(crate) fn is_name_start(c: char) -> bool {
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// NOTE: in the dart-sass implementation, identifiers cannot start
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// with numbers. We explicitly differentiate from the reference
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// implementation here in order to support selectors beginning with numbers.
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// This can be considered a hack and in the future it would be nice to refactor
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// how this is handled.
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c == '_' || c.is_alphanumeric() || c as u32 >= 0x0080
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}
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pub(crate) fn as_hex(c: char) -> u32 {
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match c {
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'0'..='9' => c as u32 - '0' as u32,
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'A'..='F' => 10 + c as u32 - 'A' as u32,
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'a'..='f' => 10 + c as u32 - 'a' as u32,
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_ => panic!(),
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}
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}
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