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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /vendor/clap_derive/src/derives/parser.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/clap_derive/src/derives/parser.rs')
-rw-r--r-- | vendor/clap_derive/src/derives/parser.rs | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/vendor/clap_derive/src/derives/parser.rs b/vendor/clap_derive/src/derives/parser.rs new file mode 100644 index 000000000..621430f31 --- /dev/null +++ b/vendor/clap_derive/src/derives/parser.rs @@ -0,0 +1,95 @@ +// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>, +// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and +// Ana Hobden (@hoverbear) <operator@hoverbear.org> +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. +// +// This work was derived from Structopt (https://github.com/TeXitoi/structopt) +// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the +// MIT/Apache 2.0 license. + +use crate::{ + derives::{args, into_app, subcommand}, + dummies, +}; + +use proc_macro2::TokenStream; +use proc_macro_error::abort_call_site; +use quote::quote; +use syn::{ + self, punctuated::Punctuated, token::Comma, Attribute, Data, DataEnum, DataStruct, DeriveInput, + Field, Fields, Generics, Ident, +}; + +pub fn derive_parser(input: &DeriveInput) -> TokenStream { + let ident = &input.ident; + + match input.data { + Data::Struct(DataStruct { + fields: Fields::Named(ref fields), + .. + }) => { + dummies::parser_struct(ident); + gen_for_struct(ident, &input.generics, &fields.named, &input.attrs) + } + Data::Struct(DataStruct { + fields: Fields::Unit, + .. + }) => { + dummies::parser_struct(ident); + gen_for_struct( + ident, + &input.generics, + &Punctuated::<Field, Comma>::new(), + &input.attrs, + ) + } + Data::Enum(ref e) => { + dummies::parser_enum(ident); + gen_for_enum(ident, &input.generics, &input.attrs, e) + } + _ => abort_call_site!("`#[derive(Parser)]` only supports non-tuple structs and enums"), + } +} + +fn gen_for_struct( + name: &Ident, + generics: &Generics, + fields: &Punctuated<Field, Comma>, + attrs: &[Attribute], +) -> TokenStream { + let into_app = into_app::gen_for_struct(name, generics, attrs); + let args = args::gen_for_struct(name, generics, fields, attrs); + + let (impl_generics, ty_generics, where_clause) = generics.split_for_impl(); + + quote! { + impl #impl_generics clap::Parser for #name #ty_generics #where_clause {} + + #into_app + #args + } +} + +fn gen_for_enum( + name: &Ident, + generics: &Generics, + attrs: &[Attribute], + e: &DataEnum, +) -> TokenStream { + let into_app = into_app::gen_for_enum(name, generics, attrs); + let subcommand = subcommand::gen_for_enum(name, generics, attrs, e); + + let (impl_generics, ty_generics, where_clause) = generics.split_for_impl(); + + quote! { + impl #impl_generics clap::Parser for #name #ty_generics #where_clause {} + + #into_app + #subcommand + } +} |