vle 1.19.4

Very Little Editor - an exercise in minimalist text editing
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// Copyright 2026 Brian Langenberger
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use crate::highlighter;
use crate::syntax::{Commenting, Highlight, Plain, color};
use logos::Logos;
use ratatui::style::Color;

#[derive(Logos, Debug)]
#[logos(skip r"[ \t\n]+")]
enum XmlToken {
    #[regex("<[[:alpha:]][[:alpha:][:digit:]_]*")]
    #[regex("<![[:upper:]]+")]
    TagStart,
    #[regex("</[[:alpha:]][[:alpha:][:digit:]_]*>")]
    #[token(">")]
    #[token("/>")]
    TagEnd,
    #[regex("[[:alpha:]][[:alpha:][:digit:]_]*=")]
    FieldName,
    #[regex("&[^;[:space:]]*;")]
    CharRef,
    #[regex(r#"\"[^\"]*\""#)]
    String,
    #[token("<!--")]
    StartComment,
    #[token("-->")]
    EndComment,
}

impl TryFrom<XmlToken> for Highlight {
    type Error = ();

    fn try_from(t: XmlToken) -> Result<Highlight, ()> {
        match t {
            XmlToken::TagStart | XmlToken::TagEnd => Ok(Color::Cyan.into()),
            XmlToken::CharRef => Ok(Color::Red.into()),
            XmlToken::FieldName => Ok(Color::Blue.into()),
            XmlToken::String => Ok(color::STRING),
            XmlToken::StartComment | XmlToken::EndComment => Ok(color::COMMENT),
        }
    }
}

#[derive(Debug)]
pub struct Xml;

impl std::fmt::Display for Xml {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        "XML".fmt(f)
    }
}

highlighter!(
    Xml,
    XmlToken,
    StartComment,
    EndComment,
    "<!--",
    "-->",
    color::COMMENT
);