rustik-highlight 0.1.0

Rustik code highlighter.
Documentation 
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//! Error types for grammar, theme, and registry operations.
//!
//! The crate intentionally exposes a small error surface: invalid source data,
//! invalid regexes, and failed registry lookups. Lower-level parser details are
//! collapsed here so callers can report actionable load or selection failures
//! without depending on the JSON or regex implementation.

use std::fmt;

/// Highlighting error.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Error {
    /// Input could not be parsed as a valid grammar.
    InvalidGrammar,
    /// Input could not be parsed as a valid theme.
    InvalidTheme,
    /// Regex data could not be compiled.
    InvalidRegex(String),
    /// A named grammar was not found.
    UnknownSyntax(String),
    /// A named theme was not found.
    UnknownTheme(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::InvalidGrammar => f.write_str("invalid grammar"),
            Self::InvalidTheme => f.write_str("invalid theme"),
            Self::InvalidRegex(pattern) => write!(f, "invalid regex `{pattern}`"),
            Self::UnknownSyntax(name) => write!(f, "unknown syntax `{name}`"),
            Self::UnknownTheme(name) => write!(f, "unknown theme `{name}`"),
        }
    }
}

impl std::error::Error for Error {}