84 lines
2.3 KiB
Rust
84 lines
2.3 KiB
Rust
use crate::err::{ErrorType, ProcessingResult};
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use crate::proc::Processor;
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use crate::spec::codepoint::is_whitespace;
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include!(concat!(env!("OUT_DIR"), "/gen_pattern_CSS_COMMENT_END.rs"));
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fn is_string_delimiter(c: u8) -> bool {
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match c {
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b'"' | b'\'' => true,
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_ => false,
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}
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}
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fn parse_comment(proc: &mut Processor) -> ProcessingResult<()> {
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if cfg!(debug_assertions) {
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chain!(proc.match_seq(b"/*").expect().discard());
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} else {
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proc.skip_amount_expect(2);
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};
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// Unlike script tags, style comments do NOT end at closing tag.
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chain!(proc.match_while_not_seq(CSS_COMMENT_END).discard());
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chain!(proc.match_seq(b"*/").require_with_reason("CSS comment end")?.discard());
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Ok(())
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}
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fn parse_string(proc: &mut Processor) -> ProcessingResult<()> {
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let delim = if cfg!(debug_assertions) {
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chain!(proc.match_pred(is_string_delimiter).expect().keep().char())
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} else {
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proc.accept_expect()
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};
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let mut escaping = false;
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loop {
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let c = proc.accept()?;
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if c == b'\\' {
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escaping = !escaping;
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continue;
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};
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if !escaping {
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if c == delim {
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break;
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};
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// We've already accepted char, so we can't use proc.match_line_terminator.
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if c == b'\r' || c == b'\n' {
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return Err(ErrorType::UnterminatedCssString);
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};
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} else {
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escaping = false;
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};
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};
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Ok(())
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}
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pub fn process_style(proc: &mut Processor) -> ProcessingResult<()> {
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// TODO Refactor
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chain!(proc.match_while_pred(is_whitespace).discard());
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// This variable is used so that trailing whitespace is simply trimmed/removed instead of collapsed.
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let mut discarded_whitespace = false;
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while !chain!(proc.match_seq(b"</").matched()) {
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if discarded_whitespace {
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proc.write(b' ');
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discarded_whitespace = false;
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};
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if chain!(proc.match_while_pred(is_whitespace).discard().matched()) {
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discarded_whitespace = true;
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} else if chain!(proc.match_seq(b"/*").matched()) {
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parse_comment(proc)?;
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} else if chain!(proc.match_pred(is_string_delimiter).matched()) {
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parse_string(proc)?;
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} else {
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proc.accept()?;
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};
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};
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Ok(())
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}
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