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extern crate proc_macro;
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use syn::{Data, DeriveInput};
#[proc_macro_derive(DisplayInnerSegment)]
pub fn display_inner(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let ast = syn::parse_macro_input!(input as DeriveInput);
let toks = generate_inner_display(&ast).unwrap_or_else(|err| err.to_compile_error());
toks.into()
}
#[proc_macro_derive(DisplayOuterSegment)]
pub fn display_outer(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let ast = syn::parse_macro_input!(input as DeriveInput);
let toks = generate_outer_display(&ast).unwrap_or_else(|err| err.to_compile_error());
toks.into()
}
#[proc_macro_derive(DisplayEdifact)]
pub fn display_edifact(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let ast = syn::parse_macro_input!(input as DeriveInput);
let toks = generate_edifact(&ast).unwrap_or_else(|err| err.to_compile_error());
toks.into()
}
#[proc_macro_derive(DisplayEdifactSg)]
pub fn display_edifact_sg(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let ast = syn::parse_macro_input!(input as DeriveInput);
let toks = generate_edifact_sg(&ast).unwrap_or_else(|err| err.to_compile_error());
toks.into()
}
fn generate_inner_display(ast: &DeriveInput) -> syn::Result<TokenStream> {
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let output = gen_types(ast);
Ok(quote! {
impl #impl_generics ::core::fmt::Display for #name #ty_generics #where_clause {
fn fmt<'x>(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut str: Vec<String> = vec![];
#(#output)*
let joined = str.join(":");
let joined = joined.trim_end_matches(":");
write!(f, "{}", joined)
}
}
})
}
fn generate_outer_display(ast: &DeriveInput) -> syn::Result<TokenStream> {
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let output = gen_types(ast);
let s = format_ident!("{}", name).to_string().to_uppercase();
Ok(quote! {
impl #impl_generics ::core::fmt::Display for #name #ty_generics #where_clause {
fn fmt<'x>(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut str: Vec<String> = vec![];
str.push(#s.to_string());
#(#output)*
let joined = str.join("+");
let joined = joined.trim_end_matches("+");
if joined.len() > 3 {
write!(f, "{}", joined)
}else{
write!(f, "")
}
}
}
})
}
fn generate_edifact(ast: &DeriveInput) -> syn::Result<TokenStream> {
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let output = gen_types(ast);
Ok(quote! {
impl #impl_generics ::core::fmt::Display for #name #ty_generics #where_clause {
fn fmt<'x>(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut str: Vec<String> = vec![];
#(#output)*
let str: Vec<String> = str
.iter()
.map(|v| v.clone())
.filter(|s| !s.is_empty())
.collect();
let joined = str.join("'\n");
write!(f, "{}'", joined)
}
}
})
}
fn generate_edifact_sg(ast: &DeriveInput) -> syn::Result<TokenStream> {
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let output = gen_types(ast);
Ok(quote! {
impl #impl_generics ::core::fmt::Display for #name #ty_generics #where_clause {
fn fmt<'x>(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut str: Vec<String> = vec![];
#(#output)*
let str: Vec<String> = str
.iter()
.map(|v| v.clone())
.filter(|s| !s.is_empty())
.collect();
let joined = str.join("'\n");
write!(f, "{}", joined)
}
}
})
}
fn gen_types(ast: &DeriveInput) -> Vec<TokenStream> {
let x = &ast.data;
let mut output = vec![];
match x {
Data::Struct(s) => {
let f = &s.fields;
for o in f {
let id = o.ident.clone().unwrap();
let t = &o.ty;
match t {
syn::Type::Path(p) => {
let s = &p.path.segments;
let w = &s.first().unwrap().ident;
let ty = w.to_string();
match ty.as_str() {
"Vec" => {
let ts = quote! {
if self.#id.is_empty() {
str.push("".to_string());
}else{
self.#id.iter().for_each(|x| str.push(format!("{}",x)));
}
};
output.push(ts);
}
"Option" => {
let ts = quote! {
str.push(self.#id.as_ref().map_or("".to_string(),|x| format!("{}",x)));
};
output.push(ts);
}
_ => {
let ts = quote! {
str.push(format!("{}",self.#id));
};
output.push(ts);
}
}
}
_ => {}
}
}
}
_ => {}
}
output
}