diff options
Diffstat (limited to 'vendor/clap_derive/src/derives/args.rs')
| -rw-r--r-- | vendor/clap_derive/src/derives/args.rs | 765 |
1 files changed, 765 insertions, 0 deletions
diff --git a/vendor/clap_derive/src/derives/args.rs b/vendor/clap_derive/src/derives/args.rs new file mode 100644 index 0000000..279f6ca --- /dev/null +++ b/vendor/clap_derive/src/derives/args.rs @@ -0,0 +1,765 @@ +// 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 proc_macro2::{Ident, Span, TokenStream}; +use quote::{format_ident, quote, quote_spanned}; +use syn::{ + punctuated::Punctuated, spanned::Spanned, token::Comma, Data, DataStruct, DeriveInput, Field, + Fields, FieldsNamed, Generics, +}; + +use crate::item::{Item, Kind, Name}; +use crate::utils::{inner_type, sub_type, Sp, Ty}; + +pub fn derive_args(input: &DeriveInput) -> Result<TokenStream, syn::Error> { + let ident = &input.ident; + + match input.data { + Data::Struct(DataStruct { + fields: Fields::Named(ref fields), + .. + }) => { + let name = Name::Derived(ident.clone()); + let item = Item::from_args_struct(input, name)?; + let fields = collect_args_fields(&item, fields)?; + gen_for_struct(&item, ident, &input.generics, &fields) + } + Data::Struct(DataStruct { + fields: Fields::Unit, + .. + }) => { + let name = Name::Derived(ident.clone()); + let item = Item::from_args_struct(input, name)?; + let fields = Punctuated::<Field, Comma>::new(); + let fields = fields + .iter() + .map(|field| { + let item = Item::from_args_field(field, item.casing(), item.env_casing())?; + Ok((field, item)) + }) + .collect::<Result<Vec<_>, syn::Error>>()?; + gen_for_struct(&item, ident, &input.generics, &fields) + } + _ => abort_call_site!("`#[derive(Args)]` only supports non-tuple structs"), + } +} + +pub fn gen_for_struct( + item: &Item, + item_name: &Ident, + generics: &Generics, + fields: &[(&Field, Item)], +) -> Result<TokenStream, syn::Error> { + if !matches!(&*item.kind(), Kind::Command(_)) { + abort! { item.kind().span(), + "`{}` cannot be used with `command`", + item.kind().name(), + } + } + + let (impl_generics, ty_generics, where_clause) = generics.split_for_impl(); + + let constructor = gen_constructor(fields)?; + let updater = gen_updater(fields, true)?; + let raw_deprecated = raw_deprecated(); + + let app_var = Ident::new("__clap_app", Span::call_site()); + let augmentation = gen_augment(fields, &app_var, item, false)?; + let augmentation_update = gen_augment(fields, &app_var, item, true)?; + + let group_id = if item.skip_group() { + quote!(None) + } else { + let group_id = item.group_id(); + quote!(Some(clap::Id::from(#group_id))) + }; + + Ok(quote! { + #[allow( + dead_code, + unreachable_code, + unused_variables, + unused_braces, + unused_qualifications, + )] + #[allow( + clippy::style, + clippy::complexity, + clippy::pedantic, + clippy::restriction, + clippy::perf, + clippy::deprecated, + clippy::nursery, + clippy::cargo, + clippy::suspicious_else_formatting, + clippy::almost_swapped, + clippy::redundant_locals, + )] + #[automatically_derived] + impl #impl_generics clap::FromArgMatches for #item_name #ty_generics #where_clause { + fn from_arg_matches(__clap_arg_matches: &clap::ArgMatches) -> ::std::result::Result<Self, clap::Error> { + Self::from_arg_matches_mut(&mut __clap_arg_matches.clone()) + } + + fn from_arg_matches_mut(__clap_arg_matches: &mut clap::ArgMatches) -> ::std::result::Result<Self, clap::Error> { + #raw_deprecated + let v = #item_name #constructor; + ::std::result::Result::Ok(v) + } + + fn update_from_arg_matches(&mut self, __clap_arg_matches: &clap::ArgMatches) -> ::std::result::Result<(), clap::Error> { + self.update_from_arg_matches_mut(&mut __clap_arg_matches.clone()) + } + + fn update_from_arg_matches_mut(&mut self, __clap_arg_matches: &mut clap::ArgMatches) -> ::std::result::Result<(), clap::Error> { + #raw_deprecated + #updater + ::std::result::Result::Ok(()) + } + } + + #[allow( + dead_code, + unreachable_code, + unused_variables, + unused_braces, + unused_qualifications, + )] + #[allow( + clippy::style, + clippy::complexity, + clippy::pedantic, + clippy::restriction, + clippy::perf, + clippy::deprecated, + clippy::nursery, + clippy::cargo, + clippy::suspicious_else_formatting, + clippy::almost_swapped, + clippy::redundant_locals, + )] + #[automatically_derived] + impl #impl_generics clap::Args for #item_name #ty_generics #where_clause { + fn group_id() -> Option<clap::Id> { + #group_id + } + fn augment_args<'b>(#app_var: clap::Command) -> clap::Command { + #augmentation + } + fn augment_args_for_update<'b>(#app_var: clap::Command) -> clap::Command { + #augmentation_update + } + } + }) +} + +/// Generate a block of code to add arguments/subcommands corresponding to +/// the `fields` to an cmd. +pub fn gen_augment( + fields: &[(&Field, Item)], + app_var: &Ident, + parent_item: &Item, + override_required: bool, +) -> Result<TokenStream, syn::Error> { + let mut subcommand_specified = false; + let mut args = Vec::new(); + for (field, item) in fields { + let kind = item.kind(); + let genned = match &*kind { + Kind::Command(_) + | Kind::Value + | Kind::Skip(_, _) + | Kind::FromGlobal(_) + | Kind::ExternalSubcommand => None, + Kind::Subcommand(ty) => { + if subcommand_specified { + abort!( + field.span(), + "`#[command(subcommand)]` can only be used once per container" + ); + } + subcommand_specified = true; + + let subcmd_type = match (**ty, sub_type(&field.ty)) { + (Ty::Option, Some(sub_type)) => sub_type, + _ => &field.ty, + }; + let implicit_methods = if **ty == Ty::Option { + quote!() + } else { + quote_spanned! { kind.span()=> + .subcommand_required(true) + .arg_required_else_help(true) + } + }; + + let override_methods = if override_required { + quote_spanned! { kind.span()=> + .subcommand_required(false) + .arg_required_else_help(false) + } + } else { + quote!() + }; + + Some(quote! { + let #app_var = <#subcmd_type as clap::Subcommand>::augment_subcommands( #app_var ); + let #app_var = #app_var + #implicit_methods + #override_methods; + }) + } + Kind::Flatten(ty) => { + let inner_type = match (**ty, sub_type(&field.ty)) { + (Ty::Option, Some(sub_type)) => sub_type, + _ => &field.ty, + }; + + let next_help_heading = item.next_help_heading(); + let next_display_order = item.next_display_order(); + if override_required { + Some(quote_spanned! { kind.span()=> + let #app_var = #app_var + #next_help_heading + #next_display_order; + let #app_var = <#inner_type as clap::Args>::augment_args_for_update(#app_var); + }) + } else { + Some(quote_spanned! { kind.span()=> + let #app_var = #app_var + #next_help_heading + #next_display_order; + let #app_var = <#inner_type as clap::Args>::augment_args(#app_var); + }) + } + } + Kind::Arg(ty) => { + let value_parser = item.value_parser(&field.ty); + let action = item.action(&field.ty); + let value_name = item.value_name(); + + let implicit_methods = match **ty { + Ty::Unit => { + // Leaving out `value_parser` as it will always fail + quote_spanned! { ty.span()=> + .value_name(#value_name) + #action + } + } + Ty::Option => { + quote_spanned! { ty.span()=> + .value_name(#value_name) + #value_parser + #action + } + } + + Ty::OptionOption => quote_spanned! { ty.span()=> + .value_name(#value_name) + .num_args(0..=1) + #value_parser + #action + }, + + Ty::OptionVec => { + if item.is_positional() { + quote_spanned! { ty.span()=> + .value_name(#value_name) + .num_args(1..) // action won't be sufficient for getting multiple + #value_parser + #action + } + } else { + quote_spanned! { ty.span()=> + .value_name(#value_name) + #value_parser + #action + } + } + } + + Ty::Vec => { + if item.is_positional() { + quote_spanned! { ty.span()=> + .value_name(#value_name) + .num_args(1..) // action won't be sufficient for getting multiple + #value_parser + #action + } + } else { + quote_spanned! { ty.span()=> + .value_name(#value_name) + #value_parser + #action + } + } + } + + Ty::VecVec | Ty::OptionVecVec => { + quote_spanned! { ty.span() => + .value_name(#value_name) + #value_parser + #action + } + } + + Ty::Other => { + let required = item.find_default_method().is_none(); + // `ArgAction::takes_values` is assuming `ArgAction::default_value` will be + // set though that won't always be true but this should be good enough, + // otherwise we'll report an "arg required" error when unwrapping. + let action_value = action.args(); + quote_spanned! { ty.span()=> + .value_name(#value_name) + .required(#required && #action_value.takes_values()) + #value_parser + #action + } + } + }; + + let id = item.id(); + let explicit_methods = item.field_methods(); + let deprecations = if !override_required { + item.deprecations() + } else { + quote!() + }; + let override_methods = if override_required { + quote_spanned! { kind.span()=> + .required(false) + } + } else { + quote!() + }; + + Some(quote_spanned! { field.span()=> + let #app_var = #app_var.arg({ + #deprecations + + #[allow(deprecated)] + let arg = clap::Arg::new(#id) + #implicit_methods; + + let arg = arg + #explicit_methods; + + let arg = arg + #override_methods; + + arg + }); + }) + } + }; + args.push(genned); + } + + let deprecations = if !override_required { + parent_item.deprecations() + } else { + quote!() + }; + let initial_app_methods = parent_item.initial_top_level_methods(); + let final_app_methods = parent_item.final_top_level_methods(); + let group_app_methods = if parent_item.skip_group() { + quote!() + } else { + let group_id = parent_item.group_id(); + let literal_group_members = fields + .iter() + .filter_map(|(_field, item)| { + let kind = item.kind(); + if matches!(*kind, Kind::Arg(_)) { + Some(item.id()) + } else { + None + } + }) + .collect::<Vec<_>>(); + let literal_group_members_len = literal_group_members.len(); + let mut literal_group_members = quote! {{ + let members: [clap::Id; #literal_group_members_len] = [#( clap::Id::from(#literal_group_members) ),* ]; + members + }}; + // HACK: Validation isn't ready yet for nested arg groups, so just don't populate the group in + // that situation + let possible_group_members_len = fields + .iter() + .filter(|(_field, item)| { + let kind = item.kind(); + matches!(*kind, Kind::Flatten(_)) + }) + .count(); + if 0 < possible_group_members_len { + literal_group_members = quote! {{ + let members: [clap::Id; 0] = []; + members + }}; + } + + let group_methods = parent_item.group_methods(); + + quote!( + .group( + clap::ArgGroup::new(#group_id) + .multiple(true) + #group_methods + .args(#literal_group_members) + ) + ) + }; + Ok(quote! {{ + #deprecations + let #app_var = #app_var + #initial_app_methods + #group_app_methods + ; + #( #args )* + #app_var #final_app_methods + }}) +} + +pub fn gen_constructor(fields: &[(&Field, Item)]) -> Result<TokenStream, syn::Error> { + let fields = fields.iter().map(|(field, item)| { + let field_name = field.ident.as_ref().unwrap(); + let kind = item.kind(); + let arg_matches = format_ident!("__clap_arg_matches"); + let genned = match &*kind { + Kind::Command(_) + | Kind::Value + | Kind::ExternalSubcommand => { + abort! { kind.span(), + "`{}` cannot be used with `arg`", + kind.name(), + } + } + Kind::Subcommand(ty) => { + let subcmd_type = match (**ty, sub_type(&field.ty)) { + (Ty::Option, Some(sub_type)) => sub_type, + _ => &field.ty, + }; + match **ty { + Ty::Option => { + quote_spanned! { kind.span()=> + #field_name: { + if #arg_matches.subcommand_name().map(<#subcmd_type as clap::Subcommand>::has_subcommand).unwrap_or(false) { + Some(<#subcmd_type as clap::FromArgMatches>::from_arg_matches_mut(#arg_matches)?) + } else { + None + } + } + } + }, + Ty::Other => { + quote_spanned! { kind.span()=> + #field_name: { + <#subcmd_type as clap::FromArgMatches>::from_arg_matches_mut(#arg_matches)? + } + } + }, + Ty::Unit | + Ty::Vec | + Ty::OptionOption | + Ty::OptionVec | + Ty::VecVec | + Ty::OptionVecVec => { + abort!( + ty.span(), + "{} types are not supported for subcommand", + ty.as_str() + ); + } + } + } + + Kind::Flatten(ty) => { + let inner_type = match (**ty, sub_type(&field.ty)) { + (Ty::Option, Some(sub_type)) => sub_type, + _ => &field.ty, + }; + match **ty { + Ty::Other => { + quote_spanned! { kind.span()=> + #field_name: <#inner_type as clap::FromArgMatches>::from_arg_matches_mut(#arg_matches)? + } + }, + Ty::Option => { + quote_spanned! { kind.span()=> + #field_name: { + let group_id = <#inner_type as clap::Args>::group_id() + .expect("`#[arg(flatten)]`ed field type implements `Args::group_id`"); + if #arg_matches.contains_id(group_id.as_str()) { + Some( + <#inner_type as clap::FromArgMatches>::from_arg_matches_mut(#arg_matches)? + ) + } else { + None + } + } + } + }, + Ty::Unit | + Ty::Vec | + Ty::OptionOption | + Ty::OptionVec | + Ty::VecVec | + Ty::OptionVecVec => { + abort!( + ty.span(), + "{} types are not supported for flatten", + ty.as_str() + ); + } + } + }, + + Kind::Skip(val, _) => match val { + None => quote_spanned!(kind.span()=> #field_name: Default::default()), + Some(val) => quote_spanned!(kind.span()=> #field_name: (#val).into()), + }, + + Kind::Arg(ty) | Kind::FromGlobal(ty) => { + gen_parsers(item, ty, field_name, field, None)? + } + }; + Ok(genned) + }).collect::<Result<Vec<_>, syn::Error>>()?; + + Ok(quote! {{ + #( #fields ),* + }}) +} + +pub fn gen_updater(fields: &[(&Field, Item)], use_self: bool) -> Result<TokenStream, syn::Error> { + let mut genned_fields = Vec::new(); + for (field, item) in fields { + let field_name = field.ident.as_ref().unwrap(); + let kind = item.kind(); + + let access = if use_self { + quote! { + #[allow(non_snake_case)] + let #field_name = &mut self.#field_name; + } + } else { + quote!() + }; + let arg_matches = format_ident!("__clap_arg_matches"); + + let genned = match &*kind { + Kind::Command(_) | Kind::Value | Kind::ExternalSubcommand => { + abort! { kind.span(), + "`{}` cannot be used with `arg`", + kind.name(), + } + } + Kind::Subcommand(ty) => { + let subcmd_type = match (**ty, sub_type(&field.ty)) { + (Ty::Option, Some(sub_type)) => sub_type, + _ => &field.ty, + }; + + let updater = quote_spanned! { ty.span()=> + <#subcmd_type as clap::FromArgMatches>::update_from_arg_matches_mut(#field_name, #arg_matches)?; + }; + + let updater = match **ty { + Ty::Option => quote_spanned! { kind.span()=> + if let Some(#field_name) = #field_name.as_mut() { + #updater + } else { + *#field_name = Some(<#subcmd_type as clap::FromArgMatches>::from_arg_matches_mut( + #arg_matches + )?); + } + }, + _ => quote_spanned! { kind.span()=> + #updater + }, + }; + + quote_spanned! { kind.span()=> + { + #access + #updater + } + } + } + + Kind::Flatten(ty) => { + let inner_type = match (**ty, sub_type(&field.ty)) { + (Ty::Option, Some(sub_type)) => sub_type, + _ => &field.ty, + }; + + let updater = quote_spanned! { ty.span()=> + <#inner_type as clap::FromArgMatches>::update_from_arg_matches_mut(#field_name, #arg_matches)?; + }; + + let updater = match **ty { + Ty::Option => quote_spanned! { kind.span()=> + if let Some(#field_name) = #field_name.as_mut() { + #updater + } else { + *#field_name = Some(<#inner_type as clap::FromArgMatches>::from_arg_matches_mut( + #arg_matches + )?); + } + }, + _ => quote_spanned! { kind.span()=> + #updater + }, + }; + + quote_spanned! { kind.span()=> + { + #access + #updater + } + } + } + + Kind::Skip(_, _) => quote!(), + + Kind::Arg(ty) | Kind::FromGlobal(ty) => { + gen_parsers(item, ty, field_name, field, Some(&access))? + } + }; + genned_fields.push(genned); + } + + Ok(quote! { + #( #genned_fields )* + }) +} + +fn gen_parsers( + item: &Item, + ty: &Sp<Ty>, + field_name: &Ident, + field: &Field, + update: Option<&TokenStream>, +) -> Result<TokenStream, syn::Error> { + let span = ty.span(); + let convert_type = inner_type(&field.ty); + let id = item.id(); + let get_one = quote_spanned!(span=> remove_one::<#convert_type>); + let get_many = quote_spanned!(span=> remove_many::<#convert_type>); + let get_occurrences = quote_spanned!(span=> remove_occurrences::<#convert_type>); + + // Give this identifier the same hygiene + // as the `arg_matches` parameter definition. This + // allows us to refer to `arg_matches` within a `quote_spanned` block + let arg_matches = format_ident!("__clap_arg_matches"); + + let field_value = match **ty { + Ty::Unit => { + quote_spanned! { ty.span()=> + () + } + } + + Ty::Option => { + quote_spanned! { ty.span()=> + #arg_matches.#get_one(#id) + } + } + + Ty::OptionOption => quote_spanned! { ty.span()=> + if #arg_matches.contains_id(#id) { + Some( + #arg_matches.#get_one(#id) + ) + } else { + None + } + }, + + Ty::OptionVec => quote_spanned! { ty.span()=> + if #arg_matches.contains_id(#id) { + Some(#arg_matches.#get_many(#id) + .map(|v| v.collect::<Vec<_>>()) + .unwrap_or_else(Vec::new)) + } else { + None + } + }, + + Ty::Vec => { + quote_spanned! { ty.span()=> + #arg_matches.#get_many(#id) + .map(|v| v.collect::<Vec<_>>()) + .unwrap_or_else(Vec::new) + } + } + + Ty::VecVec => quote_spanned! { ty.span()=> + #arg_matches.#get_occurrences(#id) + .map(|g| g.map(::std::iter::Iterator::collect).collect::<Vec<Vec<_>>>()) + .unwrap_or_else(Vec::new) + }, + + Ty::OptionVecVec => quote_spanned! { ty.span()=> + #arg_matches.#get_occurrences(#id) + .map(|g| g.map(::std::iter::Iterator::collect).collect::<Vec<Vec<_>>>()) + }, + + Ty::Other => { + quote_spanned! { ty.span()=> + #arg_matches.#get_one(#id) + .ok_or_else(|| clap::Error::raw(clap::error::ErrorKind::MissingRequiredArgument, concat!("The following required argument was not provided: ", #id)))? + } + } + }; + + let genned = if let Some(access) = update { + quote_spanned! { field.span()=> + if #arg_matches.contains_id(#id) { + #access + *#field_name = #field_value + } + } + } else { + quote_spanned!(field.span()=> #field_name: #field_value ) + }; + Ok(genned) +} + +#[cfg(feature = "raw-deprecated")] +pub fn raw_deprecated() -> TokenStream { + quote! {} +} + +#[cfg(not(feature = "raw-deprecated"))] +pub fn raw_deprecated() -> TokenStream { + quote! { + #![allow(deprecated)] // Assuming any deprecation in here will be related to a deprecation in `Args` + + } +} + +pub fn collect_args_fields<'a>( + item: &'a Item, + fields: &'a FieldsNamed, +) -> Result<Vec<(&'a Field, Item)>, syn::Error> { + fields + .named + .iter() + .map(|field| { + let item = Item::from_args_field(field, item.casing(), item.env_casing())?; + Ok((field, item)) + }) + .collect() +} |