oak-ruby 0.0.9

Ruby dynamic programming language parser with support for object-oriented programming and modern Ruby features.
Documentation 
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#![doc = include_str!("readme.md")]

/// Ruby syntax highlighter
pub struct RubyHighlighter {
    /// Whether to use parser-based highlighting for better accuracy
    pub use_parser: bool,
}

impl Default for RubyHighlighter {
    fn default() -> Self {
        Self { use_parser: false }
    }
}

impl RubyHighlighter {
    /// Creates a new Ruby highlighter instance
    pub fn new() -> Self {
        Self::default()
    }

    /// Highlights Ruby keywords
    pub fn highlight(&self, text: &str) -> Vec<(usize, usize, String)> {
        let mut highlights = Vec::new();
        let keywords = [
            "if", "unless", "elsif", "else", "case", "when", "then", "for", "while", "until", "break", "next", "redo", "retry", "return", "yield", "def", "class", "module", "end", "lambda", "proc", "begin", "rescue", "ensure", "raise", "require", "load",
            "include", "extend", "prepend", "and", "or", "not", "in", "true", "false", "nil", "super", "self", "alias", "undef", "defined", "do",
        ];

        for keyword in &keywords {
            let mut start = 0;
            while let Some(pos) = text[start..].find(keyword) {
                let absolute_pos = start + pos;
                let end_pos = absolute_pos + keyword.len();

                let is_word_boundary_before = absolute_pos == 0 || !text.chars().nth(absolute_pos - 1).unwrap_or(' ').is_alphanumeric();
                let is_word_boundary_after = end_pos >= text.len() || !text.chars().nth(end_pos).unwrap_or(' ').is_alphanumeric();

                if is_word_boundary_before && is_word_boundary_after {
                    highlights.push((absolute_pos, end_pos, "keyword".to_string()))
                }
                start = absolute_pos + 1
            }
        }
        highlights
    }
}