nuwiki/crates/nuwiki-core/src/syntax/registry.rs

//! Registry of syntax plugins.
//!
//! Plugins are stored behind `Arc<dyn SyntaxPlugin>` so the LSP layer can
//! hand a cheap clone to per-document tasks without re-locking the registry.

use std::sync::Arc;

use super::SyntaxPlugin;

#[derive(Default, Clone)]
pub struct SyntaxRegistry {
    plugins: Vec<Arc<dyn SyntaxPlugin>>,
}

impl SyntaxRegistry {
    pub fn new() -> Self {
        Self::default()
    }

    /// Register a plugin owned directly. The most common shape — implementer
    /// hands over a value, registry takes ownership.
    pub fn register<P>(&mut self, plugin: P)
    where
        P: SyntaxPlugin + 'static,
    {
        self.plugins.push(Arc::new(plugin));
    }

    /// Look up a plugin by its `id`.
    pub fn get(&self, id: &str) -> Option<&dyn SyntaxPlugin> {
        self.plugins
            .iter()
            .find(|p| p.id() == id)
            .map(|p| p.as_ref())
    }

    /// Look up a plugin by file extension. `ext` should include the leading
    /// dot (e.g. `".wiki"`) — matches the plugin's `file_extensions()`.
    pub fn detect_from_extension(&self, ext: &str) -> Option<&dyn SyntaxPlugin> {
        self.plugins
            .iter()
            .find(|p| p.file_extensions().iter().any(|e| *e == ext))
            .map(|p| p.as_ref())
    }

    /// Iterate over registered plugins in registration order.
    pub fn iter(&self) -> impl Iterator<Item = &dyn SyntaxPlugin> + '_ {
        self.plugins.iter().map(|p| p.as_ref())
    }

    pub fn len(&self) -> usize {
        self.plugins.len()
    }

    pub fn is_empty(&self) -> bool {
        self.plugins.is_empty()
    }
}