//! Multi-language code generation backends for parsed CSS.

//!

//! The kernel of a future "compile UI to standalone project" feature exposed by

//! the `azul-dll` debug HTTP server: a parsed [`Css`](crate::css::Css) is fed to

//! a [`CodegenBackend`] implementation, which returns a complete source string

//! plus auxiliary files (e.g. `Cargo.toml`) for a target language.

//!

//! Today only [`rust::RustBackend`] is implemented; [`cpp`] and [`python`] hold

//! stub backends so the public API stays stable as new languages come online.

use alloc::{string::String, vec::Vec};

use crate::css::Css;

pub mod cpp;

pub mod python;

pub mod rust;

/// One emitted source artifact (e.g. `src/main.rs`, `Cargo.toml`).

pub struct GeneratedFile {

    pub path: String,

    pub contents: String,

}

/// Pluggable code-generation strategy. Each backend turns a parsed [`Css`] into

/// a list of files that, taken together, form a buildable standalone project.

pub trait CodegenBackend {

    /// Stable identifier (e.g. `"rust"`) used by the HTTP layer to pick a backend.

    fn lang(&self) -> &'static str;

    /// Render a single CSS expression. Useful for tests / quick previews where

    /// the caller doesn't want a full project layout.

    fn emit_css(&self, css: &Css) -> String;

    /// Emit a complete standalone project. The returned files are root-relative.

    fn emit_project(&self, css: &Css) -> Vec<GeneratedFile>;

}

/// Look up a backend by its [`CodegenBackend::lang`] identifier.

    }