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John Doty 2024-03-08 11:03:01 -08:00
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{"files":{"Cargo.toml":"52b85211ff88471f42762cc33015ad64aadab316ad5a558624494cb221468de4","LICENSE":"58d1e17ffe5109a7ae296caafcadfdbe6a7d176f0bc4ab01e12a689b0499d8bd","README.md":"4bc486666b59f60547c2df161687edbda1c39ef7d951a161f243d151b7b9d239","src/lib.rs":"7080ff0f5f2fea5a26f698933a512314ffd91fbe9bacc8f11cd4a293d53054b7","tests/arg_count.rs":"996530ee450644f774c2f12c20c92a05d3e17df9482febd7eba027f9de38156e","tests/as_mut.rs":"d5c60107797c0144b7fb69cecd84d7052d66b507b63d9e11fa9f494b095e6757","tests/generic.rs":"839e6fb41338a0ec596a44e7a236db3b95e7fbf57974d6b473c2ed615cf7c12b","tests/reference.rs":"c11bb3e574cb730b781f279679756454a2b3c04ec7b868352874f11fb4d6f548","tests/rename.rs":"27e09798efb9ac68dd77a2912746b9bd90e10edfa64ae1f3a9d41a52ba8c8eb4","tests/trailing_punct.rs":"0c2f2dfc083ef35387da647fd97b09f914df3f46c40cf03c50dd97b1105277f8","tests/usage.rs":"c19c5649097751962a1ae2b4e2f0b50d0b1f63fa3b8325378c1a0f9008c9e7c2"},"package":"59a85abdc13717906baccb5a1e435556ce0df215f242892f721dff62bf25288f"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
name = "is-macro"
version = "0.3.5"
authors = ["강동윤 <kdy1997.dev@gmail.com>"]
description = "Derive methods for using custom enums like Option / Result"
documentation = "https://docs.rs/is-macro"
readme = "README.md"
license = "Apache-2.0"
repository = "https://github.com/dudykr/ddbase"
resolver = "2"
[lib]
proc-macro = true
[dependencies.Inflector]
version = "0.11.4"
default-features = false
[dependencies.proc-macro2]
version = "1"
[dependencies.quote]
version = "1"
[dependencies.syn]
version = "2"
features = [
"fold",
"full",
"derive",
"extra-traits",
"fold",
]

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# is-macro
See the [documentation](https://docs.rs/is-macro) for more information.
## License
Apache 2.0

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extern crate proc_macro;
use inflector::Inflector;
use proc_macro2::Span;
use quote::{quote, ToTokens};
use syn::{
parse,
parse::Parse,
parse2, parse_quote,
punctuated::{Pair, Punctuated},
spanned::Spanned,
Data, DataEnum, DeriveInput, Expr, ExprLit, Field, Fields, Generics, Ident, ImplItem, ItemImpl,
Lit, Meta, MetaNameValue, Path, Token, Type, TypePath, TypeReference, TypeTuple, WhereClause,
};
/// A proc macro to generate methods like is_variant / expect_variant.
///
///
/// # Example
///
/// ```rust
///
/// use is_macro::Is;
/// #[derive(Debug, Is)]
/// pub enum Enum<T> {
/// A,
/// B(T),
/// C(Option<T>),
/// }
///
/// // Rust's type inference cannot handle this.
/// assert!(Enum::<()>::A.is_a());
///
/// assert_eq!(Enum::B(String::from("foo")).b(), Some(String::from("foo")));
///
/// assert_eq!(Enum::B(String::from("foo")).expect_b(), String::from("foo"));
/// ```
///
/// # Renaming
///
/// ```rust
///
/// use is_macro::Is;
/// #[derive(Debug, Is)]
/// pub enum Enum {
/// #[is(name = "video_mp4")]
/// VideoMp4,
/// }
///
/// assert!(Enum::VideoMp4.is_video_mp4());
/// ```
#[proc_macro_derive(Is, attributes(is))]
pub fn is(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input: DeriveInput = syn::parse(input).expect("failed to parse derive input");
let generics: Generics = input.generics.clone();
let items = match input.data {
Data::Enum(e) => expand(e),
_ => panic!("`Is` can be applied only on enums"),
};
ItemImpl {
attrs: vec![],
defaultness: None,
unsafety: None,
impl_token: Default::default(),
generics: Default::default(),
trait_: None,
self_ty: Box::new(Type::Path(TypePath {
qself: None,
path: Path::from(input.ident),
})),
brace_token: Default::default(),
items,
}
.with_generics(generics)
.into_token_stream()
.into()
}
#[derive(Debug)]
struct Input {
name: String,
}
impl Parse for Input {
fn parse(input: parse::ParseStream) -> syn::Result<Self> {
let _: Ident = input.parse()?;
let _: Token![=] = input.parse()?;
let name = input.parse::<ExprLit>()?;
Ok(Input {
name: match name.lit {
Lit::Str(s) => s.value(),
_ => panic!("is(name = ...) expects a string literal"),
},
})
}
}
fn expand(input: DataEnum) -> Vec<ImplItem> {
let mut items = vec![];
for v in &input.variants {
let attrs = v
.attrs
.iter()
.filter(|attr| attr.path().is_ident("is"))
.collect::<Vec<_>>();
if attrs.len() >= 2 {
panic!("derive(Is) expects no attribute or one attribute")
}
let i = match attrs.into_iter().next() {
None => Input {
name: {
v.ident.to_string().to_snake_case()
//
},
},
Some(attr) => {
//
let mut input = Input {
name: Default::default(),
};
let mut apply = |v: &MetaNameValue| {
assert!(
v.path.is_ident("name"),
"Currently, is() only supports `is(name = 'foo')`"
);
input.name = match &v.value {
Expr::Lit(ExprLit {
lit: Lit::Str(s), ..
}) => s.value(),
_ => unimplemented!(
"is(): name must be a string literal but {:?} is provided",
v.value
),
};
};
match &attr.meta {
Meta::NameValue(v) => {
//
apply(v)
}
Meta::List(l) => {
// Handle is(name = "foo")
input = parse2(l.tokens.clone()).expect("failed to parse input");
}
_ => unimplemented!("is({:?})", attr.meta),
}
input
}
};
let name = &*i.name;
{
let name_of_is = Ident::new(&format!("is_{name}"), v.ident.span());
let docs_of_is = format!(
"Returns `true` if `self` is of variant [`{variant}`].\n\n[`{variant}`]: \
#variant.{variant}",
variant = v.ident,
);
let variant = &v.ident;
let item_impl: ItemImpl = parse_quote!(
impl Type {
#[doc = #docs_of_is]
#[inline]
pub const fn #name_of_is(&self) -> bool {
match *self {
Self::#variant { .. } => true,
_ => false,
}
}
}
);
items.extend(item_impl.items);
}
{
let name_of_cast = Ident::new(&format!("as_{name}"), v.ident.span());
let name_of_cast_mut = Ident::new(&format!("as_mut_{name}"), v.ident.span());
let name_of_expect = Ident::new(&format!("expect_{name}"), v.ident.span());
let name_of_take = Ident::new(name, v.ident.span());
let docs_of_cast = format!(
"Returns `Some` if `self` is a reference of variant [`{variant}`], and `None` \
otherwise.\n\n[`{variant}`]: #variant.{variant}",
variant = v.ident,
);
let docs_of_cast_mut = format!(
"Returns `Some` if `self` is a mutable reference of variant [`{variant}`], and \
`None` otherwise.\n\n[`{variant}`]: #variant.{variant}",
variant = v.ident,
);
let docs_of_expect = format!(
"Unwraps the value, yielding the content of [`{variant}`].\n\n# Panics\n\nPanics \
if the value is not [`{variant}`], with a panic message including the content of \
`self`.\n\n[`{variant}`]: #variant.{variant}",
variant = v.ident,
);
let docs_of_take = format!(
"Returns `Some` if `self` is of variant [`{variant}`], and `None` \
otherwise.\n\n[`{variant}`]: #variant.{variant}",
variant = v.ident,
);
if let Fields::Unnamed(fields) = &v.fields {
let types = fields.unnamed.iter().map(|f| f.ty.clone());
let cast_ty = types_to_type(types.clone().map(|ty| add_ref(false, ty)));
let cast_ty_mut = types_to_type(types.clone().map(|ty| add_ref(true, ty)));
let ty = types_to_type(types);
let mut fields: Punctuated<Ident, Token![,]> = fields
.unnamed
.clone()
.into_pairs()
.enumerate()
.map(|(i, pair)| {
let handle = |f: Field| {
//
Ident::new(&format!("v{i}"), f.span())
};
match pair {
Pair::Punctuated(v, p) => Pair::Punctuated(handle(v), p),
Pair::End(v) => Pair::End(handle(v)),
}
})
.collect();
// Make sure that we don't have any trailing punctuation
// This ensure that if we have a single unnamed field,
// we will produce a value of the form `(v)`,
// not a single-element tuple `(v,)`
if let Some(mut pair) = fields.pop() {
if let Pair::Punctuated(v, _) = pair {
pair = Pair::End(v);
}
fields.extend(std::iter::once(pair));
}
let variant = &v.ident;
let item_impl: ItemImpl = parse_quote!(
impl #ty {
#[doc = #docs_of_cast]
#[inline]
pub fn #name_of_cast(&self) -> Option<#cast_ty> {
match self {
Self::#variant(#fields) => Some((#fields)),
_ => None,
}
}
#[doc = #docs_of_cast_mut]
#[inline]
pub fn #name_of_cast_mut(&mut self) -> Option<#cast_ty_mut> {
match self {
Self::#variant(#fields) => Some((#fields)),
_ => None,
}
}
#[doc = #docs_of_expect]
#[inline]
pub fn #name_of_expect(self) -> #ty
where
Self: ::std::fmt::Debug,
{
match self {
Self::#variant(#fields) => (#fields),
_ => panic!("called expect on {:?}", self),
}
}
#[doc = #docs_of_take]
#[inline]
pub fn #name_of_take(self) -> Option<#ty> {
match self {
Self::#variant(#fields) => Some((#fields)),
_ => None,
}
}
}
);
items.extend(item_impl.items);
}
}
}
items
}
fn types_to_type(types: impl Iterator<Item = Type>) -> Type {
let mut types: Punctuated<_, _> = types.collect();
if types.len() == 1 {
types.pop().expect("len is 1").into_value()
} else {
TypeTuple {
paren_token: Default::default(),
elems: types,
}
.into()
}
}
fn add_ref(mutable: bool, ty: Type) -> Type {
Type::Reference(TypeReference {
and_token: Default::default(),
lifetime: None,
mutability: if mutable {
Some(Default::default())
} else {
None
},
elem: Box::new(ty),
})
}
/// Extension trait for `ItemImpl` (impl block).
trait ItemImplExt {
/// Instead of
///
/// ```rust,ignore
/// let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
///
/// let item: Item = Quote::new(def_site::<Span>())
/// .quote_with(smart_quote!(
/// Vars {
/// Type: type_name,
/// impl_generics,
/// ty_generics,
/// where_clause,
/// },
/// {
/// impl impl_generics ::swc_common::AstNode for Type ty_generics
/// where_clause {}
/// }
/// )).parse();
/// ```
///
/// You can use this like
///
/// ```rust,ignore
// let item = Quote::new(def_site::<Span>())
/// .quote_with(smart_quote!(Vars { Type: type_name }, {
/// impl ::swc_common::AstNode for Type {}
/// }))
/// .parse::<ItemImpl>()
/// .with_generics(input.generics);
/// ```
fn with_generics(self, generics: Generics) -> Self;
}
impl ItemImplExt for ItemImpl {
fn with_generics(mut self, mut generics: Generics) -> Self {
// TODO: Check conflicting name
let need_new_punct = !generics.params.empty_or_trailing();
if need_new_punct {
generics
.params
.push_punct(syn::token::Comma(Span::call_site()));
}
// Respan
if let Some(t) = generics.lt_token {
self.generics.lt_token = Some(t)
}
if let Some(t) = generics.gt_token {
self.generics.gt_token = Some(t)
}
let ty = self.self_ty;
// Handle generics defined on struct, enum, or union.
let mut item: ItemImpl = {
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
let item = if let Some((ref polarity, ref path, ref for_token)) = self.trait_ {
quote! {
impl #impl_generics #polarity #path #for_token #ty #ty_generics #where_clause {}
}
} else {
quote! {
impl #impl_generics #ty #ty_generics #where_clause {}
}
};
parse2(item.into_token_stream())
.unwrap_or_else(|err| panic!("with_generics failed: {}", err))
};
// Handle generics added by proc-macro.
item.generics
.params
.extend(self.generics.params.into_pairs());
match self.generics.where_clause {
Some(WhereClause {
ref mut predicates, ..
}) => predicates.extend(
generics
.where_clause
.into_iter()
.flat_map(|wc| wc.predicates.into_pairs()),
),
ref mut opt @ None => *opt = generics.where_clause,
}
ItemImpl {
attrs: self.attrs,
defaultness: self.defaultness,
unsafety: self.unsafety,
impl_token: self.impl_token,
brace_token: self.brace_token,
items: self.items,
..item
}
}
}

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use is_macro::Is;
#[derive(Debug, Is)]
pub enum Enum {
A(),
B(usize, usize),
C(String),
D(&'static str, &'static mut u32),
}

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use is_macro::Is;
#[derive(Debug, PartialEq, Is)]
pub enum Enum {
A(u32),
B(Vec<u32>),
}
#[test]
fn test() {
let mut e = Enum::A(0);
*e.as_mut_a().unwrap() += 1;
assert_eq!(e, Enum::A(1));
let mut e = Enum::B(vec![]);
e.as_mut_b().unwrap().push(1);
assert_eq!(e, Enum::B(vec![1]));
}

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use is_macro::Is;
#[derive(Debug, Is)]
pub enum Enum<T> {
A,
B(T),
C(Option<T>),
}

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use is_macro::Is;
#[derive(Debug, Is)]
pub enum Enum {
A,
B(&'static str),
C(&'static mut u32),
}

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use is_macro::Is;
#[derive(Debug, Is)]
pub enum Enum {
#[is(name = "video_mp4")]
VideoMp4,
}
#[test]
fn test() {
assert!(Enum::VideoMp4.is_video_mp4());
}

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third-party/vendor/is-macro/tests/trailing_punct.rs vendored Normal file
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@ -0,0 +1,6 @@
use is_macro::Is;
#[derive(Debug, Is)]
pub enum Enum {
B(usize),
}

8
third-party/vendor/is-macro/tests/usage.rs vendored Normal file
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@ -0,0 +1,8 @@
use is_macro::Is;
#[derive(Debug, Is)]
pub enum Enum {
A,
B(String),
C(bool),
}