nordisk/skade

vendor/iceberg-property-macro-arrow59/src/lib.rs

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#![doc = include_str!("../README.md")]

use proc_macro::TokenStream;
use syn::{DeriveInput, ItemStruct, parse_macro_input};

mod properties;
mod properties_view;

/// Derives property-map parsing and opt-in read-only accessors for a struct.
#[proc_macro_derive(Properties, attributes(property))]
pub fn derive_properties(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    match properties::expand_properties(input) {
        Ok(tokens) => tokens.into(),
        Err(error) => error.into_compile_error().into(),
    }
}

/// Defines a borrowed view that parses properties independently through generated getters.
#[proc_macro]
pub fn properties_view(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as ItemStruct);

    match properties_view::expand_properties_view(input) {
        Ok(tokens) => tokens.into(),
        Err(error) => error.into_compile_error().into(),
    }
}