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extern crate proc_macro;
extern crate proc_macro2;
#[macro_use]
extern crate proc_macro_error;
use proc_macro::TokenStream;
use std::borrow::Borrow;
use syn::{self, Data, DeriveInput, Fields};
use crate::derives::{impl_edge_record_macro, impl_record_macro, impl_validate_macro};
mod derives;
mod parse_attribute;
mod symbol;
mod to_tokenstream;
mod toolbox;
#[proc_macro_error]
#[proc_macro_derive(Record, attributes(hook))]
pub fn record_macro_derive(attr: TokenStream) -> TokenStream {
let span = attr.clone().into_iter().next().unwrap().span();
let ast: DeriveInput = syn::parse(attr).unwrap();
match impl_record_macro(&ast) {
Ok(stream) => stream,
Err(error) => {
emit_error!(span, error);
panic!();
}
}
}
#[proc_macro_error]
#[proc_macro_derive(Validate, attributes(validate))]
pub fn validate_macro_derive(attr: TokenStream) -> TokenStream {
let span = attr.clone().into_iter().next().unwrap().span();
let ast: DeriveInput = syn::parse(attr).unwrap();
match impl_validate_macro(&ast) {
Ok(stream) => stream,
Err(error) => {
emit_error!(span, error);
panic!();
}
}
}
#[proc_macro_error]
#[proc_macro_derive(EdgeRecord)]
pub fn edge_record_macro_derive(attr: TokenStream) -> TokenStream {
let span = attr.clone().into_iter().next().unwrap().span();
let ast: DeriveInput = syn::parse(attr).unwrap();
let mut has_from = false;
let mut has_to = false;
match ast.data.borrow() {
Data::Struct(elem) => match elem.fields.borrow() {
Fields::Named(named_fields) => {
for named_field in named_fields.named.iter() {
match named_field.ident.borrow() {
Some(ident) => {
let field_name = &ident.to_string();
if field_name == "_to" {
has_to = true
} else if field_name == "_from" {
has_from = true
}
}
None => (),
}
}
}
_ => {}
},
_ => emit_error!(span, "Only Structs can derive `EdgeRecord`"),
}
if !has_from || !has_to {
emit_error!(
span,
"`EdgeRecord` derived structs require a `_from` and `_to` fields"
)
}
impl_edge_record_macro(&ast)
}