sassi-macros 0.1.0-beta.1

Support proc-macro crate re-exported by sassi for ordinary adopters.
Documentation 
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//! `#[derive(Cacheable)]` proc-macro entry point.
//!
//! The derive emits a companion `{Type}Fields` struct for predicate accessors.
//! The companion struct mirrors the model's visibility, and each accessor field
//! mirrors the visibility of the source field. This preserves Rust field privacy:
//! a public model with private fields still has private generated accessors.

use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use syn::{DeriveInput, parse_macro_input};

use crate::sassi_path;

pub fn derive_cacheable(input: TokenStream) -> TokenStream {
    let parsed = parse_macro_input!(input as DeriveInput);
    let sassi_path: TokenStream2 = match sassi_path() {
        Ok(path) => path,
        Err(e) => return e.to_compile_error().into(),
    };

    let options = match sassi_codegen::parse_cacheable_derive_options(&parsed) {
        Ok(options) => options,
        Err(e) => return e.to_compile_error().into(),
    };

    let fields_struct = match sassi_codegen::generate_fields_struct(&parsed, &sassi_path) {
        Ok(ts) => ts,
        Err(e) => return e.to_compile_error().into(),
    };

    let cacheable_impl =
        match sassi_codegen::generate_cacheable_impl(&parsed, &options, &sassi_path) {
            Ok(ts) => ts,
            Err(e) => return e.to_compile_error().into(),
        };

    let delta_sync_impl =
        match sassi_codegen::generate_delta_sync_cacheable_impl(&parsed, &options, &sassi_path) {
            Ok(ts) => ts,
            Err(e) => return e.to_compile_error().into(),
        };

    let combined: TokenStream2 = quote! {
        #fields_struct
        #cacheable_impl
        #delta_sync_impl
    };
    combined.into()
}