60 lines
1.5 KiB
Rust
60 lines
1.5 KiB
Rust
use std::iter::Iterator;
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use peekmore::PeekMoreIterator;
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use super::read_until_closing_quote;
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use crate::Token;
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pub(crate) fn read_until_char<I: Iterator<Item = Token>>(
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toks: &mut PeekMoreIterator<I>,
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c: char,
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) -> Vec<Token> {
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let mut v = Vec::new();
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while let Some(tok) = toks.next() {
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match tok.kind {
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'"' | '\'' => {
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v.push(tok);
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v.extend(read_until_closing_quote(toks, tok.kind));
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continue;
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}
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t if t == c => break,
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_ => {}
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}
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v.push(tok)
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}
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v
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}
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pub(crate) fn hex_char_for(number: u32) -> char {
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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_digit(10) || 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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