derive/src/lib.rs

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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//! Procedural macros for sqlparser.
//!
//! This crate provides:
//! - [`Visit`] and [`VisitMut`] derive macros for AST traversal.
//! - [`derive_dialect!`] macro for creating custom SQL dialects.

use quote::quote;
use syn::parse_macro_input;

mod dialect;
mod visit;

/// Implementation of `#[derive(VisitMut)]`
#[proc_macro_derive(VisitMut, attributes(visit))]
pub fn derive_visit_mut(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let input = parse_macro_input!(input as syn::DeriveInput);
    visit::derive_visit(
        input,
        &visit::VisitType {
            visit_trait: quote!(VisitMut),
            visitor_trait: quote!(VisitorMut),
            modifier: Some(quote!(mut)),
        },
    )
}

/// Implementation of `#[derive(Visit)]`
#[proc_macro_derive(Visit, attributes(visit))]
pub fn derive_visit_immutable(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let input = parse_macro_input!(input as syn::DeriveInput);
    visit::derive_visit(
        input,
        &visit::VisitType {
            visit_trait: quote!(Visit),
            visitor_trait: quote!(Visitor),
            modifier: None,
        },
    )
}

/// Procedural macro for deriving new SQL dialects.
#[proc_macro]
pub fn derive_dialect(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let input = parse_macro_input!(input as dialect::DeriveDialectInput);
    dialect::derive_dialect(input)
}