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item.rs
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item.rs
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// 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 std::env;
use heck::{ToKebabCase, ToLowerCamelCase, ToShoutySnakeCase, ToSnakeCase, ToUpperCamelCase};
use proc_macro2::{self, Span, TokenStream};
use proc_macro_error::abort;
use quote::{quote, quote_spanned, ToTokens};
use syn::DeriveInput;
use syn::{
self, ext::IdentExt, spanned::Spanned, Attribute, Field, Ident, LitStr, MetaNameValue, Type,
Variant,
};
use crate::attr::*;
use crate::utils::{inner_type, is_simple_ty, process_doc_comment, Sp, Ty};
/// Default casing style for generated arguments.
pub const DEFAULT_CASING: CasingStyle = CasingStyle::Kebab;
/// Default casing style for environment variables
pub const DEFAULT_ENV_CASING: CasingStyle = CasingStyle::ScreamingSnake;
#[derive(Clone)]
pub struct Item {
name: Name,
ident: Ident,
casing: Sp<CasingStyle>,
env_casing: Sp<CasingStyle>,
ty: Option<Type>,
doc_comment: Vec<Method>,
methods: Vec<Method>,
deprecations: Vec<Deprecation>,
value_parser: Option<ValueParser>,
action: Option<Action>,
verbatim_doc_comment: bool,
next_display_order: Option<Method>,
next_help_heading: Option<Method>,
is_enum: bool,
is_positional: bool,
kind: Sp<Kind>,
}
impl Item {
pub fn from_args_struct(input: &DeriveInput, name: Name) -> Self {
let ident = input.ident.clone();
let span = input.ident.span();
let attrs = &input.attrs;
let argument_casing = Sp::new(DEFAULT_CASING, span);
let env_casing = Sp::new(DEFAULT_ENV_CASING, span);
let kind = Sp::new(Kind::Command(Sp::new(Ty::Other, span)), span);
let mut res = Self::new(name, ident, None, argument_casing, env_casing, kind);
let parsed_attrs = ClapAttr::parse_all(attrs);
res.infer_kind(&parsed_attrs);
res.push_attrs(&parsed_attrs);
res.push_doc_comment(attrs, "about", true);
res
}
pub fn from_subcommand_enum(input: &DeriveInput, name: Name) -> Self {
let ident = input.ident.clone();
let span = input.ident.span();
let attrs = &input.attrs;
let argument_casing = Sp::new(DEFAULT_CASING, span);
let env_casing = Sp::new(DEFAULT_ENV_CASING, span);
let kind = Sp::new(Kind::Command(Sp::new(Ty::Other, span)), span);
let mut res = Self::new(name, ident, None, argument_casing, env_casing, kind);
let parsed_attrs = ClapAttr::parse_all(attrs);
res.infer_kind(&parsed_attrs);
res.push_attrs(&parsed_attrs);
res.push_doc_comment(attrs, "about", true);
res
}
pub fn from_value_enum(input: &DeriveInput, name: Name) -> Self {
let ident = input.ident.clone();
let span = input.ident.span();
let attrs = &input.attrs;
let argument_casing = Sp::new(DEFAULT_CASING, span);
let env_casing = Sp::new(DEFAULT_ENV_CASING, span);
let kind = Sp::new(Kind::Value, span);
let mut res = Self::new(name, ident, None, argument_casing, env_casing, kind);
let parsed_attrs = ClapAttr::parse_all(attrs);
res.infer_kind(&parsed_attrs);
res.push_attrs(&parsed_attrs);
// Ignoring `push_doc_comment` as there is no top-level clap builder to add documentation
// to
if res.has_explicit_methods() {
abort!(
res.methods[0].name.span(),
"{} doesn't exist for `ValueEnum` enums",
res.methods[0].name
);
}
res
}
pub fn from_subcommand_variant(
variant: &Variant,
struct_casing: Sp<CasingStyle>,
env_casing: Sp<CasingStyle>,
) -> Self {
let name = variant.ident.clone();
let ident = variant.ident.clone();
let span = variant.span();
let ty = match variant.fields {
syn::Fields::Unnamed(syn::FieldsUnnamed { ref unnamed, .. }) if unnamed.len() == 1 => {
Ty::from_syn_ty(&unnamed[0].ty)
}
syn::Fields::Named(_) | syn::Fields::Unnamed(..) | syn::Fields::Unit => {
Sp::new(Ty::Other, span)
}
};
let kind = Sp::new(Kind::Command(ty), span);
let mut res = Self::new(
Name::Derived(name),
ident,
None,
struct_casing,
env_casing,
kind,
);
let parsed_attrs = ClapAttr::parse_all(&variant.attrs);
res.infer_kind(&parsed_attrs);
res.push_attrs(&parsed_attrs);
if matches!(&*res.kind, Kind::Command(_)) {
res.push_doc_comment(&variant.attrs, "about", true);
}
match &*res.kind {
Kind::Flatten => {
if res.has_explicit_methods() {
abort!(
res.kind.span(),
"methods are not allowed for flattened entry"
);
}
}
Kind::Subcommand(_)
| Kind::ExternalSubcommand
| Kind::FromGlobal(_)
| Kind::Skip(_, _)
| Kind::Command(_)
| Kind::Value
| Kind::Arg(_) => (),
}
res
}
pub fn from_value_enum_variant(
variant: &Variant,
argument_casing: Sp<CasingStyle>,
env_casing: Sp<CasingStyle>,
) -> Self {
let ident = variant.ident.clone();
let span = variant.span();
let kind = Sp::new(Kind::Value, span);
let mut res = Self::new(
Name::Derived(variant.ident.clone()),
ident,
None,
argument_casing,
env_casing,
kind,
);
let parsed_attrs = ClapAttr::parse_all(&variant.attrs);
res.infer_kind(&parsed_attrs);
res.push_attrs(&parsed_attrs);
if matches!(&*res.kind, Kind::Value) {
res.push_doc_comment(&variant.attrs, "help", false);
}
res
}
pub fn from_args_field(
field: &Field,
struct_casing: Sp<CasingStyle>,
env_casing: Sp<CasingStyle>,
) -> Self {
let name = field.ident.clone().unwrap();
let ident = field.ident.clone().unwrap();
let span = field.span();
let ty = Ty::from_syn_ty(&field.ty);
let kind = Sp::new(Kind::Arg(ty), span);
let mut res = Self::new(
Name::Derived(name),
ident,
Some(field.ty.clone()),
struct_casing,
env_casing,
kind,
);
let parsed_attrs = ClapAttr::parse_all(&field.attrs);
res.infer_kind(&parsed_attrs);
res.push_attrs(&parsed_attrs);
if matches!(&*res.kind, Kind::Arg(_)) {
res.push_doc_comment(&field.attrs, "help", true);
}
match &*res.kind {
Kind::Flatten => {
if res.has_explicit_methods() {
abort!(
res.kind.span(),
"methods are not allowed for flattened entry"
);
}
}
Kind::Subcommand(_) => {
if res.has_explicit_methods() {
abort!(
res.kind.span(),
"methods in attributes are not allowed for subcommand"
);
}
}
Kind::Skip(_, _)
| Kind::FromGlobal(_)
| Kind::Arg(_)
| Kind::Command(_)
| Kind::Value
| Kind::ExternalSubcommand => {}
}
res
}
fn new(
name: Name,
ident: Ident,
ty: Option<Type>,
casing: Sp<CasingStyle>,
env_casing: Sp<CasingStyle>,
kind: Sp<Kind>,
) -> Self {
Self {
name,
ident,
ty,
casing,
env_casing,
doc_comment: vec![],
methods: vec![],
deprecations: vec![],
value_parser: None,
action: None,
verbatim_doc_comment: false,
next_display_order: None,
next_help_heading: None,
is_enum: false,
is_positional: true,
kind,
}
}
fn push_method(&mut self, kind: AttrKind, name: Ident, arg: impl ToTokens) {
if name == "id" {
match kind {
AttrKind::Command | AttrKind::Value => {
self.deprecations.push(Deprecation {
span: name.span(),
id: "id_is_only_for_arg",
version: "4.0.0",
description: format!(
"`#[{}(id)] was allowed by mistake, instead use `#[{}(name)]`",
kind.as_str(),
kind.as_str()
),
});
}
AttrKind::Group | AttrKind::Arg | AttrKind::Clap | AttrKind::StructOpt => {}
}
self.name = Name::Assigned(quote!(#arg));
} else if name == "name" {
match kind {
AttrKind::Arg => {
self.deprecations.push(Deprecation {
span: name.span(),
id: "id_is_only_for_arg",
version: "4.0.0",
description: format!(
"`#[{}(name)] was allowed by mistake, instead use `#[{}(id)]` or `#[{}(value_name)]`",
kind.as_str(),
kind.as_str(),
kind.as_str()
),
});
}
AttrKind::Group
| AttrKind::Command
| AttrKind::Value
| AttrKind::Clap
| AttrKind::StructOpt => {}
}
self.name = Name::Assigned(quote!(#arg));
} else if name == "value_parser" {
self.value_parser = Some(ValueParser::Explicit(Method::new(name, quote!(#arg))));
} else if name == "action" {
self.action = Some(Action::Explicit(Method::new(name, quote!(#arg))));
} else {
if name == "short" || name == "long" {
self.is_positional = false;
}
self.methods.push(Method::new(name, quote!(#arg)));
}
}
fn infer_kind(&mut self, attrs: &[ClapAttr]) {
for attr in attrs {
if let Some(AttrValue::Call(_)) = &attr.value {
continue;
}
let kind = match &attr.magic {
Some(MagicAttrName::FromGlobal) => {
if attr.value.is_some() {
let expr = attr.value_or_abort();
abort!(expr, "attribute `{}` does not accept a value", attr.name);
}
let ty = self
.kind()
.ty()
.cloned()
.unwrap_or_else(|| Sp::new(Ty::Other, self.kind.span()));
let kind = Sp::new(Kind::FromGlobal(ty), attr.name.clone().span());
Some(kind)
}
Some(MagicAttrName::Subcommand) if attr.value.is_none() => {
if attr.value.is_some() {
let expr = attr.value_or_abort();
abort!(expr, "attribute `{}` does not accept a value", attr.name);
}
let ty = self
.kind()
.ty()
.cloned()
.unwrap_or_else(|| Sp::new(Ty::Other, self.kind.span()));
let kind = Sp::new(Kind::Subcommand(ty), attr.name.clone().span());
Some(kind)
}
Some(MagicAttrName::ExternalSubcommand) if attr.value.is_none() => {
if attr.value.is_some() {
let expr = attr.value_or_abort();
abort!(expr, "attribute `{}` does not accept a value", attr.name);
}
let kind = Sp::new(Kind::ExternalSubcommand, attr.name.clone().span());
Some(kind)
}
Some(MagicAttrName::Flatten) if attr.value.is_none() => {
if attr.value.is_some() {
let expr = attr.value_or_abort();
abort!(expr, "attribute `{}` does not accept a value", attr.name);
}
let kind = Sp::new(Kind::Flatten, attr.name.clone().span());
Some(kind)
}
Some(MagicAttrName::Skip) => {
let expr = attr.value.clone();
let kind = Sp::new(
Kind::Skip(expr, self.kind.attr_kind()),
attr.name.clone().span(),
);
Some(kind)
}
_ => None,
};
if let Some(kind) = kind {
self.set_kind(kind);
}
}
}
fn push_attrs(&mut self, attrs: &[ClapAttr]) {
for attr in attrs {
let actual_attr_kind = *attr.kind.get();
let expected_attr_kind = self.kind.attr_kind();
match (actual_attr_kind, expected_attr_kind) {
(AttrKind::Clap, _) | (AttrKind::StructOpt, _) => {
self.deprecations.push(Deprecation::attribute(
"4.0.0",
actual_attr_kind,
expected_attr_kind,
attr.kind.span(),
));
}
_ if attr.kind != expected_attr_kind => {
abort!(
attr.kind.span(),
"Expected `{}` attribute instead of `{}`",
expected_attr_kind.as_str(),
actual_attr_kind.as_str()
);
}
_ => {}
}
if let Some(AttrValue::Call(tokens)) = &attr.value {
// Force raw mode with method call syntax
self.push_method(*attr.kind.get(), attr.name.clone(), quote!(#(#tokens),*));
continue;
}
match &attr.magic {
Some(MagicAttrName::Short) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Arg]);
self.push_method(
*attr.kind.get(),
attr.name.clone(),
self.name.clone().translate_char(*self.casing),
);
}
Some(MagicAttrName::Long) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Arg]);
self.push_method(*attr.kind.get(), attr.name.clone(), self.name.clone().translate(*self.casing));
}
Some(MagicAttrName::ValueParser) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Arg]);
self.deprecations.push(Deprecation {
span: attr.name.span(),
id: "bare_value_parser",
version: "4.0.0",
description: "`#[arg(value_parser)]` is now the default and is no longer needed`".to_owned(),
});
self.value_parser = Some(ValueParser::Implicit(attr.name.clone()));
}
Some(MagicAttrName::Action) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Arg]);
self.deprecations.push(Deprecation {
span: attr.name.span(),
id: "bare_action",
version: "4.0.0",
description: "`#[arg(action)]` is now the default and is no longer needed`".to_owned(),
});
self.action = Some(Action::Implicit(attr.name.clone()));
}
Some(MagicAttrName::Env) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Arg]);
self.push_method(
*attr.kind.get(),
attr.name.clone(),
self.name.clone().translate(*self.env_casing),
);
}
Some(MagicAttrName::ValueEnum) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Arg]);
self.is_enum = true
}
Some(MagicAttrName::VerbatimDocComment) if attr.value.is_none() => {
self.verbatim_doc_comment = true
}
Some(MagicAttrName::About) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Command]);
if let Some(method) =
Method::from_env(attr.name.clone(), "CARGO_PKG_DESCRIPTION")
{
self.methods.push(method);
}
}
Some(MagicAttrName::Author) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Command]);
if let Some(method) = Method::from_env(attr.name.clone(), "CARGO_PKG_AUTHORS") {
self.methods.push(method);
}
}
Some(MagicAttrName::Version) if attr.value.is_none() => {
assert_attr_kind(attr, &[AttrKind::Command]);
if let Some(method) = Method::from_env(attr.name.clone(), "CARGO_PKG_VERSION") {
self.methods.push(method);
}
}
Some(MagicAttrName::DefaultValueT) => {
assert_attr_kind(attr, &[AttrKind::Arg]);
let ty = if let Some(ty) = self.ty.as_ref() {
ty
} else {
abort!(
attr.name.clone(),
"#[arg(default_value_t)] (without an argument) can be used \
only on field level";
note = "see \
https://github.com/clap-rs/clap/blob/master/examples/derive_ref/README.md#magic-attributes")
};
let val = if let Some(expr) = &attr.value {
quote!(#expr)
} else {
quote!(<#ty as ::std::default::Default>::default())
};
let val = if attrs
.iter()
.any(|a| a.magic == Some(MagicAttrName::ValueEnum))
{
quote_spanned!(attr.name.clone().span()=> {
static DEFAULT_VALUE: clap::__macro_refs::once_cell::sync::Lazy<String> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
let val: #ty = #val;
clap::ValueEnum::to_possible_value(&val).unwrap().get_name().to_owned()
});
let s: &'static str = &*DEFAULT_VALUE;
s
})
} else {
quote_spanned!(attr.name.clone().span()=> {
static DEFAULT_VALUE: clap::__macro_refs::once_cell::sync::Lazy<String> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
let val: #ty = #val;
::std::string::ToString::to_string(&val)
});
let s: &'static str = &*DEFAULT_VALUE;
s
})
};
let raw_ident = Ident::new("default_value", attr.name.clone().span());
self.methods.push(Method::new(raw_ident, val));
}
Some(MagicAttrName::DefaultValuesT) => {
assert_attr_kind(attr, &[AttrKind::Arg]);
let ty = if let Some(ty) = self.ty.as_ref() {
ty
} else {
abort!(
attr.name.clone(),
"#[arg(default_values_t)] (without an argument) can be used \
only on field level";
note = "see \
https://github.com/clap-rs/clap/blob/master/examples/derive_ref/README.md#magic-attributes")
};
let expr = attr.value_or_abort();
let container_type = Ty::from_syn_ty(ty);
if *container_type != Ty::Vec {
abort!(
attr.name.clone(),
"#[arg(default_values_t)] can be used only on Vec types";
note = "see \
https://github.com/clap-rs/clap/blob/master/examples/derive_ref/README.md#magic-attributes")
}
let inner_type = inner_type(ty);
// Use `Borrow<#inner_type>` so we accept `&Vec<#inner_type>` and
// `Vec<#inner_type>`.
let val = if attrs
.iter()
.any(|a| a.magic == Some(MagicAttrName::ValueEnum))
{
quote_spanned!(attr.name.clone().span()=> {
{
fn iter_to_vals<T>(iterable: impl IntoIterator<Item = T>) -> impl Iterator<Item=String>
where
T: ::std::borrow::Borrow<#inner_type>
{
iterable
.into_iter()
.map(|val| {
clap::ValueEnum::to_possible_value(val.borrow()).unwrap().get_name().to_owned()
})
}
static DEFAULT_STRINGS: clap::__macro_refs::once_cell::sync::Lazy<Vec<::std::string::String>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
iter_to_vals(#expr).collect()
});
static DEFAULT_VALUES: clap::__macro_refs::once_cell::sync::Lazy<Vec<&str>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
DEFAULT_STRINGS.iter().map(::std::string::String::as_str).collect()
});
DEFAULT_VALUES.iter().copied()
}
})
} else {
quote_spanned!(attr.name.clone().span()=> {
{
fn iter_to_vals<T>(iterable: impl IntoIterator<Item = T>) -> impl Iterator<Item=String>
where
T: ::std::borrow::Borrow<#inner_type>
{
iterable.into_iter().map(|val| val.borrow().to_string())
}
static DEFAULT_STRINGS: clap::__macro_refs::once_cell::sync::Lazy<Vec<::std::string::String>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
iter_to_vals(#expr).collect()
});
static DEFAULT_VALUES: clap::__macro_refs::once_cell::sync::Lazy<Vec<&str>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
DEFAULT_STRINGS.iter().map(::std::string::String::as_str).collect()
});
DEFAULT_VALUES.iter().copied()
}
})
};
self.methods.push(Method::new(
Ident::new("default_values", attr.name.clone().span()),
val,
));
}
Some(MagicAttrName::DefaultValueOsT) => {
assert_attr_kind(attr, &[AttrKind::Arg]);
let ty = if let Some(ty) = self.ty.as_ref() {
ty
} else {
abort!(
attr.name.clone(),
"#[arg(default_value_os_t)] (without an argument) can be used \
only on field level";
note = "see \
https://github.com/clap-rs/clap/blob/master/examples/derive_ref/README.md#magic-attributes")
};
let val = if let Some(expr) = &attr.value {
quote!(#expr)
} else {
quote!(<#ty as ::std::default::Default>::default())
};
let val = if attrs
.iter()
.any(|a| a.magic == Some(MagicAttrName::ValueEnum))
{
quote_spanned!(attr.name.clone().span()=> {
static DEFAULT_VALUE: clap::__macro_refs::once_cell::sync::Lazy<::std::ffi::OsString> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
let val: #ty = #val;
clap::ValueEnum::to_possible_value(&val).unwrap().get_name().to_owned()
});
let s: &'static ::std::ffi::OsStr = &*DEFAULT_VALUE;
s
})
} else {
quote_spanned!(attr.name.clone().span()=> {
static DEFAULT_VALUE: clap::__macro_refs::once_cell::sync::Lazy<::std::ffi::OsString> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
let val: #ty = #val;
::std::ffi::OsString::from(val)
});
let s: &'static ::std::ffi::OsStr = &*DEFAULT_VALUE;
s
})
};
let raw_ident = Ident::new("default_value", attr.name.clone().span());
self.methods.push(Method::new(raw_ident, val));
}
Some(MagicAttrName::DefaultValuesOsT) => {
assert_attr_kind(attr, &[AttrKind::Arg]);
let ty = if let Some(ty) = self.ty.as_ref() {
ty
} else {
abort!(
attr.name.clone(),
"#[arg(default_values_os_t)] (without an argument) can be used \
only on field level";
note = "see \
https://github.com/clap-rs/clap/blob/master/examples/derive_ref/README.md#magic-attributes")
};
let expr = attr.value_or_abort();
let container_type = Ty::from_syn_ty(ty);
if *container_type != Ty::Vec {
abort!(
attr.name.clone(),
"#[arg(default_values_os_t)] can be used only on Vec types";
note = "see \
https://github.com/clap-rs/clap/blob/master/examples/derive_ref/README.md#magic-attributes")
}
let inner_type = inner_type(ty);
// Use `Borrow<#inner_type>` so we accept `&Vec<#inner_type>` and
// `Vec<#inner_type>`.
let val = if attrs
.iter()
.any(|a| a.magic == Some(MagicAttrName::ValueEnum))
{
quote_spanned!(attr.name.clone().span()=> {
{
fn iter_to_vals<T>(iterable: impl IntoIterator<Item = T>) -> impl Iterator<Item=::std::ffi::OsString>
where
T: ::std::borrow::Borrow<#inner_type>
{
iterable
.into_iter()
.map(|val| {
clap::ValueEnum::to_possible_value(val.borrow()).unwrap().get_name().to_owned().into()
})
}
static DEFAULT_OS_STRINGS: clap::__macro_refs::once_cell::sync::Lazy<Vec<::std::ffi::OsString>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
iter_to_vals(#expr).collect()
});
static DEFAULT_VALUES: clap::__macro_refs::once_cell::sync::Lazy<Vec<&::std::ffi::OsStr>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
DEFAULT_OS_STRINGS.iter().map(::std::ffi::OsString::as_os_str).collect()
});
DEFAULT_VALUES.iter().copied()
}
})
} else {
quote_spanned!(attr.name.clone().span()=> {
{
fn iter_to_vals<T>(iterable: impl IntoIterator<Item = T>) -> impl Iterator<Item=::std::ffi::OsString>
where
T: ::std::borrow::Borrow<#inner_type>
{
iterable.into_iter().map(|val| val.borrow().into())
}
static DEFAULT_OS_STRINGS: clap::__macro_refs::once_cell::sync::Lazy<Vec<::std::ffi::OsString>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
iter_to_vals(#expr).collect()
});
static DEFAULT_VALUES: clap::__macro_refs::once_cell::sync::Lazy<Vec<&::std::ffi::OsStr>> = clap::__macro_refs::once_cell::sync::Lazy::new(|| {
DEFAULT_OS_STRINGS.iter().map(::std::ffi::OsString::as_os_str).collect()
});
DEFAULT_VALUES.iter().copied()
}
})
};
self.methods.push(Method::new(
Ident::new("default_values", attr.name.clone().span()),
val,
));
}
Some(MagicAttrName::NextDisplayOrder) => {
assert_attr_kind(attr, &[AttrKind::Command]);
let expr = attr.value_or_abort();
self.next_display_order = Some(Method::new(attr.name.clone(), quote!(#expr)));
}
Some(MagicAttrName::NextHelpHeading) => {
assert_attr_kind(attr, &[AttrKind::Command]);
let expr = attr.value_or_abort();
self.next_help_heading = Some(Method::new(attr.name.clone(), quote!(#expr)));
}
Some(MagicAttrName::RenameAll) => {
let lit = attr.lit_str_or_abort();
self.casing = CasingStyle::from_lit(lit);
}
Some(MagicAttrName::RenameAllEnv) => {
assert_attr_kind(attr, &[AttrKind::Command, AttrKind::Arg]);
let lit = attr.lit_str_or_abort();
self.env_casing = CasingStyle::from_lit(lit);
}
None
// Magic only for the default, otherwise just forward to the builder
| Some(MagicAttrName::Short)
| Some(MagicAttrName::Long)
| Some(MagicAttrName::Env)
| Some(MagicAttrName::About)
| Some(MagicAttrName::Author)
| Some(MagicAttrName::Version)
=> {
let expr = attr.value_or_abort();
self.push_method(*attr.kind.get(), attr.name.clone(), expr);
}
// Magic only for the default, otherwise just forward to the builder
Some(MagicAttrName::ValueParser) | Some(MagicAttrName::Action) => {
let expr = attr.value_or_abort();
self.push_method(*attr.kind.get(), attr.name.clone(), expr);
}
// Directives that never receive a value
Some(MagicAttrName::ValueEnum)
| Some(MagicAttrName::VerbatimDocComment) => {
let expr = attr.value_or_abort();
abort!(expr, "attribute `{}` does not accept a value", attr.name);
}
// Kinds
Some(MagicAttrName::FromGlobal)
| Some(MagicAttrName::Subcommand)
| Some(MagicAttrName::ExternalSubcommand)
| Some(MagicAttrName::Flatten)
| Some(MagicAttrName::Skip) => {
}
}
}
if self.has_explicit_methods() {
if let Kind::Skip(_, attr) = &*self.kind {
abort!(
self.methods[0].name.span(),
"`{}` cannot be used with `#[{}(skip)]",
self.methods[0].name,
attr.as_str(),
);
}
if let Kind::FromGlobal(_) = &*self.kind {
abort!(
self.methods[0].name.span(),
"`{}` cannot be used with `#[arg(from_global)]",
self.methods[0].name,
);
}
}
}
fn push_doc_comment(&mut self, attrs: &[Attribute], name: &str, supports_long_help: bool) {
use syn::Lit::*;
use syn::Meta::*;
let comment_parts: Vec<_> = attrs
.iter()
.filter(|attr| attr.path.is_ident("doc"))
.filter_map(|attr| {
if let Ok(NameValue(MetaNameValue { lit: Str(s), .. })) = attr.parse_meta() {
Some(s.value())
} else {
// non #[doc = "..."] attributes are not our concern
// we leave them for rustc to handle
None
}
})
.collect();
let (short, long) = process_doc_comment(comment_parts, name, !self.verbatim_doc_comment);
self.doc_comment.extend(short);
if supports_long_help {
self.doc_comment.extend(long);
}
}
fn set_kind(&mut self, kind: Sp<Kind>) {
match (self.kind.get(), kind.get()) {
(Kind::Arg(_), Kind::FromGlobal(_))
| (Kind::Arg(_), Kind::Subcommand(_))
| (Kind::Arg(_), Kind::Flatten)
| (Kind::Arg(_), Kind::Skip(_, _))
| (Kind::Command(_), Kind::Subcommand(_))
| (Kind::Command(_), Kind::Flatten)
| (Kind::Command(_), Kind::Skip(_, _))
| (Kind::Command(_), Kind::ExternalSubcommand)
| (Kind::Value, Kind::Skip(_, _)) => {
self.kind = kind;
}
(_, _) => {
let old = self.kind.name();
let new = kind.name();
abort!(kind.span(), "`{}` cannot be used with `{}`", new, old);
}
}
}
pub fn find_default_method(&self) -> Option<&Method> {
self.methods
.iter()
.find(|m| m.name == "default_value" || m.name == "default_value_os")
}
/// generate methods from attributes on top of struct or enum
pub fn initial_top_level_methods(&self) -> TokenStream {
let next_display_order = self.next_display_order.as_ref().into_iter();
let next_help_heading = self.next_help_heading.as_ref().into_iter();
quote!(
#(#next_display_order)*
#(#next_help_heading)*
)
}
pub fn final_top_level_methods(&self) -> TokenStream {
let methods = &self.methods;
let doc_comment = &self.doc_comment;
quote!( #(#doc_comment)* #(#methods)*)
}
/// generate methods on top of a field
pub fn field_methods(&self) -> proc_macro2::TokenStream {
let methods = &self.methods;
let doc_comment = &self.doc_comment;
quote!( #(#doc_comment)* #(#methods)* )
}
pub fn deprecations(&self) -> proc_macro2::TokenStream {
let deprecations = &self.deprecations;
quote!( #(#deprecations)* )
}
pub fn next_display_order(&self) -> TokenStream {
let next_display_order = self.next_display_order.as_ref().into_iter();
quote!( #(#next_display_order)* )
}
pub fn next_help_heading(&self) -> TokenStream {
let next_help_heading = self.next_help_heading.as_ref().into_iter();
quote!( #(#next_help_heading)* )
}
pub fn ident(&self) -> &Ident {
&self.ident
}
pub fn id(&self) -> TokenStream {
self.name.clone().raw()
}
pub fn cased_name(&self) -> TokenStream {
self.name.clone().translate(*self.casing)
}
pub fn value_name(&self) -> TokenStream {
self.name.clone().translate(CasingStyle::ScreamingSnake)
}
pub fn value_parser(&self, field_type: &Type) -> Method {
self.value_parser
.clone()
.map(|p| {
let inner_type = inner_type(field_type);
p.resolve(inner_type)
})
.unwrap_or_else(|| {
let inner_type = inner_type(field_type);
if let Some(action) = self.action.as_ref() {
let span = action.span();
default_value_parser(inner_type, span)
} else {
let span = self
.action
.as_ref()
.map(|a| a.span())
.unwrap_or_else(|| self.kind.span());
default_value_parser(inner_type, span)
}
})
}
pub fn action(&self, field_type: &Type) -> Method {
self.action
.clone()
.map(|p| p.resolve(field_type))
.unwrap_or_else(|| {
if let Some(value_parser) = self.value_parser.as_ref() {
let span = value_parser.span();
default_action(field_type, span)
} else {