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use proc_macro::{TokenStream};
use quote::{quote};
use syn::{Data, DataStruct, DeriveInput, Fields, Meta, NestedMeta, parse_macro_input};
#[proc_macro_derive(SqlxModel, attributes(sqlx_model))]
pub fn derive_model(item: TokenStream) -> TokenStream {
let input = parse_macro_input!(item as DeriveInput);
let struct_name = &input.ident;
let mut table_name=None;
let mut table_pk=vec![];
for attr in input.attrs.iter().filter(|e|{
e.path.is_ident("sqlx_model")
})
{
let meta = attr
.parse_meta()
.map_err(|e| syn::Error::new_spanned(attr, e))
.unwrap();
match meta {
Meta::List(list) => {
for cattr in list.nested.iter(){
match cattr {
NestedMeta::Meta(Meta::NameValue(ref attr_ident)) =>{
let name=attr_ident.clone();
let name=name.path.get_ident().unwrap().to_string();
let name=name.as_str();
let ident=attr_ident.clone();
match name {
"table_name"=>{
let val= match ident.lit {
syn::Lit::Str(val)=>val,
_=>unreachable!("table name must be string"),
}.value();
table_name=Some(val);
},
"table_pk"=>{
let val= match ident.lit {
syn::Lit::Str(val)=>val,
_=>unreachable!("table pk field must be string"),
}.value();
table_pk.push(val);
},
_=>{}
}
}
_ => {},
}
}
}
_ => {}
}
}
let table_name =table_name.unwrap_or_else(||{
let mut name=struct_name.to_string();
if name.clone().drain(0..5).collect::<String>()=="Model" {
name=name.drain(5..).collect::<String>();
}
if name.clone().drain(name.len()-5..).collect::<String>()=="Model" {
name=name.drain(0..name.len()-5).collect::<String>();
}
name.chars().enumerate().map(|(i,e)|{
if i!=0 && e as u8>=65&&e as u8<=90 {
format!("_{}",e.to_ascii_lowercase())
}else{
e.to_ascii_lowercase().to_string()
}
}).collect::<Vec<String>>().join("")
});
let expanded = match input.data {
Data::Struct(DataStruct{ref fields,..}) => {
if let Fields::Named(ref fields_name) = fields {
let change_fields: Vec<_> = fields_name.named.iter().map(|field| {
let field_name = field.ident.as_ref().unwrap();
let field_type = field.ty.clone();
quote! {
#field_name:#field_type
}
}).collect();
let bind_fields: Vec<_> = fields_name.named.iter().map(|field| {
let field_name = field.ident.as_ref().unwrap();
quote! {
#field_name
}
}).collect();
let change_struct=quote::format_ident!("{}Change",struct_name);
let mut pk_fields=vec![];
for field in fields_name.named.iter() {
let field_name = field.ident.as_ref().unwrap();
if table_pk.contains(&field_name.to_string()) {
pk_fields.push(field_name.to_owned());
}
}
if pk_fields.len()==0 {
if let Some(field)=fields_name.named.iter().next() {
let field_name = field.ident.as_ref().unwrap();
pk_fields.push(field_name.to_owned());
}
}
let implemented_show = quote! {
sqlx_model::model_table_value_bind_define!(#struct_name,#table_name,{#(#bind_fields),*},{#(#pk_fields),*});
sqlx_model::model_table_option_define!(#struct_name,#change_struct,{#(#change_fields),*});
};
implemented_show
} else {
panic!("sorry, may it's a complicated struct.");
}
}
_ => panic!("sorry, Show is not implemented for union or enum type.")
};
expanded.into()
}