import SwiftUI

/// Syntax highlighting for `#+begin_src` blocks, supplied by the app.
///
/// The native counterpart to ``CodeHighlighter``: that one returns HTML for the HTML
/// renderer, this returns an `AttributedString`. Keeping it a protocol is what lets
/// OrgSwiftUI stay dependency-free — a highlighting engine is the app's business.
///
/// Returning nil means "show it as plain monospaced text", which is a fine outcome for an
/// unknown language, never an error.
@MainActor
public protocol OrgCodeStyler {
    func highlighted(code: String, language: String?) -> AttributedString?
}

/// The default: no highlighting.
public struct PlainOrgCodeStyler: OrgCodeStyler {
    nonisolated public init() {}
    public func highlighted(code _: String, language _: String?) -> AttributedString? { nil }
}