hsml 0.7.2

A pug-inspired HTML preprocessor
Documentation 
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use nom::bytes::complete::take_till1;

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

fn starts_with_ascii_alphabetic(s: &str) -> bool {
    if let Some(c) = s.chars().next() {
        c.is_ascii_alphabetic()
    } else {
        false
    }
}

pub fn process_tag(input: Span<'_>) -> HsmlResult<'_, Span<'_>> {
    let (rest, tag_name) = take_till1(|c: char| c != '-' && !c.is_ascii_alphanumeric())(input)?;

    if starts_with_ascii_alphabetic(&tag_name) {
        Ok((rest, tag_name))
    } else {
        Err(HsmlError::fail_code(input, ErrorCode::InvalidTagName))
    }
}