vle 1.22.0

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::syntax::{Commenting, Highlight, Plain, color};
use crate::{define_syntax, underliner};
use logos::Logos;

#[derive(Logos, Debug)]
#[logos(skip r"[ \t\n]+")]
enum JavaScriptToken {
    #[token("async")]
    #[token("class")]
    #[token("const")]
    #[token("extends")]
    #[token("function")]
    #[token("let")]
    #[token("this")]
    #[token("typeof")]
    #[token("var")]
    #[token("void")]
    Keyword,
    #[token("do")]
    #[token("while")]
    #[token("if")]
    #[token("else")]
    #[token("switch")]
    #[token("case")]
    #[token("default")]
    #[token("for")]
    #[token("each")]
    #[token("in")]
    #[token("of")]
    #[token("with")]
    #[token("await")]
    #[token("export")]
    #[token("import")]
    #[token("throw")]
    #[token("try")]
    #[token("catch")]
    #[token("finally")]
    #[token("new")]
    #[token("delete")]
    Flow,
    #[token("break")]
    #[token("continue")]
    #[token("return")]
    #[token("yield")]
    Break,
    #[regex("([0-9]+|0x[[:xdigit:]]+)")]
    Number,
    #[regex("'([^']|\\')*'")]
    #[regex(r#"\"([^\\\"]|\\.)*\""#)]
    String,
    #[regex("[[:lower:][:upper:]][[:lower:][:upper:][:digit:]_]*")]
    Identifier,
    #[regex("//.*", allow_greedy = true)]
    Comment,
    #[token("/*")]
    StartComment,
    #[token("*/")]
    EndComment,
}

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

    fn try_from(t: JavaScriptToken) -> Result<Highlight, ()> {
        match t {
            JavaScriptToken::Comment
            | JavaScriptToken::StartComment
            | JavaScriptToken::EndComment => Ok(color::COMMENT),
            JavaScriptToken::Keyword => Ok(color::KEYWORD),
            JavaScriptToken::Flow | JavaScriptToken::Break => Ok(color::FLOW),
            JavaScriptToken::String => Ok(color::STRING),
            JavaScriptToken::Number => Ok(color::NUMBER),
            JavaScriptToken::Identifier => Err(()),
        }
    }
}

#[derive(Logos, Debug)]
#[logos(skip r"[ \t\n]+")]
enum JavaScriptDef {
    #[regex("function [[:lower:][:upper:]][[:lower:][:upper:][:digit:]_]*")]
    #[token("function")]
    #[regex("class [[:lower:][:upper:]][[:lower:][:upper:][:digit:]_]*")]
    Definition,
}

#[derive(Debug)]
pub struct JavaScript;

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

define_syntax!(
    JavaScript,
    JavaScriptToken,
    StartComment,
    EndComment,
    "/*",
    "*/",
    color::COMMENT,
    underliner!(JavaScriptDef)
);