hsml 0.7.2

A pug-inspired HTML preprocessor
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

use nom::{
    bytes::complete::{tag, take_while1},
    error::ErrorKind,
};

use crate::parser::{
    HsmlResult, Span, advance, delimited_section_len,
    error::{ErrorCode, HsmlError},
    take_prefix,
};

/// Returns true if the character is a class name delimiter (stops parsing).
fn is_class_delimiter(c: char) -> bool {
    matches!(c, '#' | '.' | '(' | ' ' | '\t' | '\r' | '\n' | '[')
}

pub(super) fn process_class(input: Span<'_>) -> HsmlResult<'_, Span<'_>> {
    let (input, _) = tag(".")(input)?;

    let mut remaining = input;
    let mut class_len = 0;

    loop {
        // Consume regular (non-delimiter, non-bracket) characters
        if let Ok((rest, taken)) =
            take_while1::<_, Span, HsmlError>(|c: char| !is_class_delimiter(c))(remaining)
        {
            class_len += taken.fragment().len();
            remaining = rest;
            continue;
        }

        // Check for bracket section
        if remaining.fragment().starts_with('[') {
            if let Some(len) = delimited_section_len(remaining.fragment(), '[', ']') {
                class_len += len;
                remaining = advance(input, class_len);
                continue;
            }
            return Err(HsmlError::fail_code(remaining, ErrorCode::UnclosedBracket));
        }

        // Any other character is a delimiter — stop
        break;
    }

    if class_len == 0 {
        return Err(HsmlError::err(input, ErrorKind::Alpha));
    }

    let class = take_prefix(input, class_len);

    Ok((remaining, class))
}