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#![recursion_limit="256"]
extern crate proc_macro;
extern crate syn;
#[macro_use]
extern crate quote;
extern crate proc_macro2;
use syn::*;
fn get_doc_comment(attrs: &[syn::Attribute]) -> String {
let mut doc_comments: Vec<_> = attrs
.iter()
.filter_map(|attr| {
let path = &attr.path;
if quote!(#path).to_string() == "doc" {
attr.interpret_meta()
} else {
None
}
})
.filter_map(|attr| {
use Lit::*;
use Meta::*;
if let NameValue(MetaNameValue {ident, lit: Str(s), ..}) = attr {
if ident != "doc" {
return None;
}
let value = s.value();
let text = value
.trim_left_matches("//!")
.trim_left_matches("///")
.trim_left_matches("/*!")
.trim_left_matches("/**")
.trim_right_matches("*/")
.trim();
if text.is_empty() {
Some("\n\n".to_string())
} else {
Some(text.to_string())
}
} else {
None
}
})
.collect();
if doc_comments.len() > 0 {
doc_comments.pop().unwrap_or("".to_string())
} else {
"".to_string()
}
}
fn one_field_name(f: syn::Fields) -> proc_macro2::TokenStream {
match f {
syn::Fields::Named(ref fields) => {
let f: Vec<_> = fields.named.clone().into_iter().collect();
let names = f.iter().map(|x| x.ident.clone().unwrap().to_string());
let types = f.iter().map(|x| x.ty.clone());
quote! {
{
let mut flagname: Option<String> = None;
#(
let thisname = format!("{}{}", prefix, #names);
let reqs = <#types as ClapMe>::requires_flags(&thisname);
if let Some(x) = reqs.first() {
flagname = Some(x.clone());
}
)*
flagname.expect("enum must have one required field!")
}
}
},
_ => {
panic!("ClapMe only supports named fields so far!")
},
}
}
fn return_with_fields(f: syn::Fields,
name: proc_macro2::TokenStream) -> proc_macro2::TokenStream {
match f {
syn::Fields::Named(ref fields) => {
let f: Vec<_> = fields.named.clone().into_iter().collect();
let names = f.iter().map(|x| x.ident.clone().unwrap().to_string());
let types = f.iter().map(|x| x.ty.clone());
let idents = f.iter().map(|x| x.ident.clone().unwrap());
quote! {
return Some( #name {
#( #idents: <#types>::from_clap(&format!("{}{}", &prefix, #names),
matches)?, )*
});
}
},
_ => {
panic!("ClapMe only supports named fields so far!")
},
}
}
fn with_clap_fields(f: syn::Fields) -> proc_macro2::TokenStream {
match f {
syn::Fields::Named(ref fields) => {
let f: Vec<_> = fields.named.clone().into_iter().collect();
let names = f.iter().rev().map(|x| x.ident.clone().unwrap().to_string());
let types = f.iter().rev().map(|x| x.ty.clone());
let names1 = f.iter().rev().map(|x| x.ident.clone().unwrap().to_string());
let types1 = f.iter().rev().map(|x| x.ty.clone());
let docs: Vec<_> = f.iter().rev().map(|x| get_doc_comment(&x.attrs)).collect();
quote!{
let mut flags: Vec<String> = Vec::new();
if !info.required {
#(flags.extend(<#types1>::requires_flags(&format!("{}{}", &prefix, #names1)));)*;
}
let mut new_req: Vec<&str> = flags.iter().map(AsRef::as_ref).collect();
new_req.extend(info.required_flags);
#( let argname: String = format!("{}{}", &prefix, #names);
let my_req: Vec<&str>
= new_req.iter().map(|&s| s).filter(|s| *s != argname).collect();
let newinfo = clapme::ArgInfo {
name: &argname,
help: #docs,
required_flags: &my_req,
required_unless_one: info.required_unless_one.clone(),
conflicted_flags: info.conflicted_flags.clone(),
..info
};
let f = |app: clapme::clap::App| {
<#types>::with_clap(newinfo, app, f)
};
)*
}
},
_ => {
panic!("ClapMe only supports named fields so far!")
},
}
}
#[proc_macro_derive(ClapMe)]
pub fn clapme(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
use syn::Data::*;
let input: DeriveInput = syn::parse(input).unwrap();
let name = &input.ident;
let find_prefix = quote!{
let prefix: String = match name.chars().next() {
None | Some('_') => "".to_string(),
_ => format!("{}-", name),
};
};
let myimpl = match input.data {
Struct(DataStruct {
fields: syn::Fields::Named(ref fields),
..
}) => {
let f: Vec<_> = fields.named.clone().into_iter().collect();
let types3 = f.iter().rev().map(|x| x.ty.clone());
let names3 = f.iter().rev().map(|x| x.ident.clone().unwrap().to_string());
let with_clap_stuff = with_clap_fields(syn::Fields::Named(fields.clone()));
let return_struct = return_with_fields(syn::Fields::Named(fields.clone()),
quote!(#name));
quote!{
fn with_clap<T>(mut info: clapme::ArgInfo,
app: clapme::clap::App,
f: impl FnOnce(clapme::clap::App) -> T)
-> T {
info.multiple = false;
let name = info.name;
#find_prefix
#with_clap_stuff
f(app)
}
fn from_clap<'a,'b>(name: &str, matches: &clapme::clap::ArgMatches) -> Option<Self> {
#find_prefix
#return_struct
}
fn requires_flags(name: &str) -> Vec<String> {
#find_prefix
let mut flags: Vec<String> = Vec::new();
#(flags.extend(<#types3>::requires_flags(&format!("{}{}", &prefix, #names3)));)*;
flags
}
}
},
Enum(ref e) => {
let v: Vec<_> = e.variants.iter().collect();
let names: Vec<_> = v.iter().map(|x| x.ident.to_string()).collect();
println!("variant names are {:?}", names);
let fields: Vec<_> = v.iter().map(|x| x.fields.clone()).collect();
let with_claps: Vec<_> = v.iter().map(|v| with_clap_fields(v.fields.clone())).collect();
println!("variant with_claps are {:?}", with_claps);
let one_field: Vec<_> = fields.iter().map(|f| one_field_name(f.clone())).collect();
let one_field2 = one_field.clone();
let one_field3 = one_field.clone();
let return_enum = v.iter().map(|v| {
let variant_name = v.ident.clone();
return_with_fields(v.fields.clone(), quote!(#name::#variant_name))
});
let s = quote! {
fn with_clap<T>(mut info: clapme::ArgInfo,
app: clapme::clap::App,
f: impl FnOnce(clapme::clap::App) -> T)
-> T {
let name = info.name;
#find_prefix
info.multiple = false;
let mut conflicts: Vec<String> = Vec::new();
#( conflicts.push(#one_field2); )*
let original_conflicted = info.conflicted_flags.clone();
let original_required_unless = info.required_unless_one.clone();
let am_required = info.required || original_required_unless.len() > 0;
info.required = false;
#(
let myself = #one_field3;
info.required_unless_one = original_required_unless.clone();
info.conflicted_flags = original_conflicted.clone();
conflicts.iter().filter(|s| **s != myself).map(|s| {
info.conflicted_flags.push(s.clone());
if am_required {
info.required_unless_one.push(s.clone());
}
}).count();
#with_claps
)*
f(app)
}
fn from_clap<'a,'b>(name: &str, matches: &clapme::clap::ArgMatches) -> Option<Self> {
#find_prefix
#(
if matches.is_present(#one_field) {
#return_enum
}
)*
panic!("Some version of the enum should be present!")
}
};
println!("{}", s);
s
},
_ => panic!("ClapMe only supports non-tuple structs and enums"),
};
let tokens2: proc_macro2::TokenStream = quote!{
impl ClapMe for #name {
#myimpl
}
};
tokens2.into()
}