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split impl_structopt into struct and enum branches

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This commit is contained in:
William Yao 2017-06-28 19:33:32 -05:00 committed by Guillaume P
parent a4826404f3
commit 00f313b5d1
1 changed files with 29 additions and 14 deletions
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43
structopt-derive/src/lib.rs
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@ -228,8 +228,8 @@ fn gen_from_clap(struct_name: &Ident, s: &[Field]) -> quote::Tokens {
}
}
fn gen_clap(ast: &DeriveInput) -> quote::Tokens {
let struct_attrs: Vec<_> = extract_attrs(&ast.attrs, AttrSource::Struct).collect();
fn gen_clap(struct_attrs: &[Attribute]) -> quote::Tokens {
let struct_attrs: Vec<_> = extract_attrs(struct_attrs, AttrSource::Struct).collect();
let name = from_attr_or_env(&struct_attrs, "name", "CARGO_PKG_NAME");
let version = from_attr_or_env(&struct_attrs, "version", "CARGO_PKG_VERSION");
let author = from_attr_or_env(&struct_attrs, "author", "CARGO_PKG_AUTHORS");
@ -285,26 +285,41 @@ fn gen_augment_clap(s: &[Field]) -> quote::Tokens {
}
}
fn impl_structopt(ast: &syn::DeriveInput) -> quote::Tokens {
fn impl_structopt_for_struct(name: &Ident, fields: &[Field], attrs: &[Attribute]) -> quote::Tokens {
let clap = gen_clap(attrs);
let augment_clap = gen_augment_clap(fields);
let from_clap = gen_from_clap(name, fields);
quote! {
impl _structopt::StructOpt for #name {
#clap
#augment_clap
#from_clap
}
}
}
fn impl_structopt_for_enum(_variants: &[Variant]) -> quote::Tokens {
quote!()
}
fn impl_structopt(ast: &DeriveInput) -> quote::Tokens {
let struct_name = &ast.ident;
let s = match ast.body {
Body::Struct(VariantData::Struct(ref s)) => s,
_ => panic!("Only struct is supported"),
let inner_impl = match ast.body {
Body::Struct(VariantData::Struct(ref fields)) =>
impl_structopt_for_struct(struct_name, fields, &ast.attrs),
Body::Enum(ref variants) =>
impl_structopt_for_enum(variants),
_ => panic!("structopt only supports non-tuple structs and enums")
};
let clap = gen_clap(ast);
let augment_clap = gen_augment_clap(s);
let from_clap = gen_from_clap(struct_name, s);
let dummy_const = Ident::new(format!("_IMPL_STRUCTOPT_FOR_{}", struct_name));
quote! {
#[allow(non_upper_case_globals, unused_attributes, unused_imports)]
const #dummy_const: () = {
extern crate structopt as _structopt;
impl _structopt::StructOpt for #struct_name {
#clap
#augment_clap
#from_clap
}
use structopt::StructOpt;
#inner_impl
};
}
}