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use crate::{Highlight, Kind};
use logos::Logos;

#[derive(Logos, PartialEq, Eq, Clone, Copy, Debug)]
pub enum JavaScript {
    #[regex("[a-zA-Z_$][a-zA-Z0-9_]*")]
    Identifier,

    #[regex("\"([^\"\\\\]|\\\\[.\n])*\"")]
    #[regex("`([^`]|\\\\`)*`")]
    #[regex("'([^']|\\\\')'")]
    #[regex("[0-9][0-9]*")]
    #[regex("0[xX][0-9a-fA-F]+")]
    #[regex("0[oO][0-7]+")]
    #[regex("0[bB][01]+")]
    Literal,

    #[regex(r#"\?|:|!|\^|-|\+|\*|&|/|\|<|>|=|=>|_"#, priority = 3)]
    Glyph,

    #[regex(r"\.")]
    GlyphCtx,

    #[regex("arguments|async|await|break|case|catch|const|continue")]
    #[regex("debugger|default|delete|do|else|enum|eval|export|extends")]
    #[regex("false|finally|for|if|implements|import|in|instanceof")]
    #[regex("interface|let|long|native|new|null|package|private")]
    #[regex("protected|public|return|static|super|switch|this|throw")]
    #[regex("true|try|typeof|var|void|while|with|yield")]
    Keyword,

    #[regex("function|class")]
    KeywordCtx,

    #[regex("undefined|Object|Array|Number|String|NaN|Infinity|Date|Math")]
    Special,

    #[regex("//[^\n]*")]
    Comment,

    None,
}

impl Highlight for JavaScript {
    const LANG: &'static str = "js";
    const START: Self = Self::None;

    fn kind(tokens: &[Self; 2]) -> Kind {
        use JavaScript::*;

        match tokens {
            [KeywordCtx, Identifier] | [GlyphCtx, Identifier] | [_, Special] => {
                Kind::SpecialIdentifier
            }
            [_, Identifier] => Kind::Identifier,
            [_, Literal] => Kind::Literal,
            [_, Glyph] | [_, GlyphCtx] => Kind::Glyph,
            [_, Keyword] | [_, KeywordCtx] => Kind::Keyword,
            [_, Comment] => Kind::Comment,
            _ => Kind::None,
        }
    }
}