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use std::convert::{TryFrom, TryInto};
use heck::ToSnakeCase;
use proc_macro::{self, TokenStream};
use quote::{quote, quote_spanned};
use syn::{parse_macro_input, Attribute, DataEnum, DataStruct, DeriveInput, Fields};
mod error;
mod iden_attr;
mod iden_path;
mod iden_variant;
use self::{
error::ErrorMsg,
iden_attr::IdenAttr,
iden_path::IdenPath,
iden_variant::{DeriveIden, DeriveIdenStatic, IdenVariant},
};
fn find_attr(attrs: &[Attribute]) -> Option<&Attribute> {
attrs
.iter()
.find(|attr| attr.path.is_ident(&IdenPath::Iden) || attr.path.is_ident(&IdenPath::Method))
}
fn find_table_name(
ident: &proc_macro2::Ident,
attrs: Vec<Attribute>,
) -> Result<String, syn::Error> {
let table_name = match find_attr(&attrs) {
Some(att) => match att.try_into()? {
IdenAttr::Rename(lit) => lit,
_ => return Err(syn::Error::new_spanned(att, ErrorMsg::ContainerAttr)),
},
None => ident.to_string().to_snake_case(),
};
Ok(table_name)
}
#[proc_macro_derive(Iden, attributes(iden, method))]
pub fn derive_iden(input: TokenStream) -> TokenStream {
let DeriveInput {
ident, data, attrs, ..
} = parse_macro_input!(input);
let table_name = match find_table_name(&ident, attrs) {
Ok(v) => v,
Err(e) => return e.to_compile_error().into(),
};
let variants =
match data {
syn::Data::Enum(DataEnum { variants, .. }) => variants,
syn::Data::Struct(DataStruct {
fields: Fields::Unit,
..
}) => {
return quote! {
impl sea_query::Iden for #ident {
fn unquoted(&self, s: &mut dyn ::std::fmt::Write) {
write!(s, #table_name).unwrap();
}
}
}
.into()
}
_ => return quote_spanned! {
ident.span() => compile_error!("you can only derive Iden on enums or unit structs");
}
.into(),
};
if variants.is_empty() {
return TokenStream::new();
}
let match_arms = match variants
.iter()
.map(|v| (table_name.as_str(), v))
.map(IdenVariant::<DeriveIden>::try_from)
.collect::<syn::Result<Vec<_>>>()
{
Ok(v) => quote! { #(#v),* },
Err(e) => return e.to_compile_error().into(),
};
let output = quote! {
impl sea_query::Iden for #ident {
fn unquoted(&self, s: &mut dyn ::std::fmt::Write) {
match self {
#match_arms
};
}
}
};
output.into()
}
#[proc_macro_derive(IdenStatic, attributes(iden, method))]
pub fn derive_iden_static(input: TokenStream) -> TokenStream {
let DeriveInput {
ident, data, attrs, ..
} = parse_macro_input!(input);
let table_name = match find_table_name(&ident, attrs) {
Ok(v) => v,
Err(e) => return e.to_compile_error().into(),
};
let variants =
match data {
syn::Data::Enum(DataEnum { variants, .. }) => variants,
syn::Data::Struct(DataStruct {
fields: Fields::Unit,
..
}) => {
return quote! {
impl sea_query::Iden for #ident {
fn unquoted(&self, s: &mut dyn ::std::fmt::Write) {
write!(s, #table_name).unwrap();
}
}
impl sea_query::IdenStatic for #ident {
fn as_str(&self) -> &'static str {
#table_name
}
}
impl std::convert::AsRef<str> for #ident {
fn as_ref(&self) -> &str {
self.as_str()
}
}
}
.into()
}
_ => return quote_spanned! {
ident.span() => compile_error!("you can only derive Iden on enums or unit structs");
}
.into(),
};
if variants.is_empty() {
return TokenStream::new();
}
let match_arms = match variants
.iter()
.map(|v| (table_name.as_str(), v))
.map(IdenVariant::<DeriveIdenStatic>::try_from)
.collect::<syn::Result<Vec<_>>>()
{
Ok(v) => quote! { #(#v),* },
Err(e) => return e.to_compile_error().into(),
};
let output = quote! {
impl sea_query::Iden for #ident {
fn unquoted(&self, s: &mut dyn ::std::fmt::Write) {
write!(s, "{}", self.as_str()).unwrap();
}
}
impl sea_query::IdenStatic for #ident {
fn as_str(&self) -> &'static str {
match self {
#match_arms
}
}
}
impl std::convert::AsRef<str> for #ident {
fn as_ref(&self) -> &'static str {
self.as_str()
}
}
};
output.into()
}