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/target/
**/*.bk
Cargo.lock

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reorder_imports = true
reorder_imports_in_group = true
reorder_imported_names = true
wrap_comments = true
write_mode = "replace"

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[workspace]
[package]
name = "swc"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[dependencies]
swc_atoms = { path = "./atoms" }
swc_common = { path = "./common" }
swc_macros = { path = "./macros" }

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Apache License
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http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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Copyright (c) 2017 The swc Project Developers
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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[package]
name = "swc_atoms"
build = "build.rs"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[dependencies]
string_cache = "0.6"
[build-dependencies]
string_cache_codegen = "0.4"

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extern crate string_cache_codegen;
use std::env;
use std::path::Path;
fn main() {
gen(
"js_ident",
"JsIdent",
&[
"break",
"case",
"catch",
"continue",
"debugger",
"default",
"do",
"else",
"finally",
"for",
"function",
"if",
"return",
"switch",
"throw",
"try",
"var",
"let",
"const",
"while",
"with",
"new",
"this",
"super",
"class",
"extends",
"export",
"import",
"yield",
"null",
"true",
"false",
"in",
"instanceof",
"typeof",
"void",
"delete",
],
);
}
fn gen(mac_name: &str, type_name: &str, atoms: &[&str]) {
string_cache_codegen::AtomType::new(type_name, &format!("{}!", mac_name))
.atoms(atoms)
.write_to_file(&Path::new(&env::var("OUT_DIR").unwrap()).join(format!("{}.rs", mac_name)))
.unwrap();
}

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extern crate string_cache;
include!(concat!(env!("OUT_DIR"), "/js_ident.rs"));

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[package]
name = "swc_common"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[dependencies]

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use EqIgnoreSpan;
use std::fmt::Debug;
use std::hash::Hash;
/// Currently just a marker trait.
///
pub trait AstNode: Debug + EqIgnoreSpan + Hash + Clone {}

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pub trait EqIgnoreSpan: Eq {
fn eq_ignore_span(&self, other: &Self) -> bool;
}
impl<T: ?Sized + Eq> EqIgnoreSpan for T {
default fn eq_ignore_span(&self, other: &Self) -> bool {
*self == *other
}
}
macro_rules! impl_for_eq_ty {
($Type:ty) => {
impl $crate::EqIgnoreSpan for $Type {
fn eq_ignore_span(&self, other: &Self) -> bool { *self == *other }
}
};
($Type:ty,) => {
impl_for_eq_ty!($Type);
};
($Type:ty, $($rest:tt)+) => {
impl_for_eq_ty!($Type);
impl_for_eq_ty!($($rest)*);
};
}
impl_for_eq_ty!(
bool,
u8,
u16,
u32,
u64,
usize,
i8,
i16,
i32,
i64,
isize,
String,
char,
);
impl<T: EqIgnoreSpan> EqIgnoreSpan for Option<T> {
fn eq_ignore_span(&self, other: &Self) -> bool {
match (self.as_ref(), other.as_ref()) {
(Some(l), Some(r)) if l.eq_ignore_span(r) => true,
_ => false,
}
}
}
impl<'a, T: ?Sized + EqIgnoreSpan> EqIgnoreSpan for &'a T {
fn eq_ignore_span(&self, other: &Self) -> bool {
<T as EqIgnoreSpan>::eq_ignore_span(*self, *other)
}
}
impl<T: EqIgnoreSpan> EqIgnoreSpan for [T] {
fn eq_ignore_span(&self, other: &Self) -> bool {
if self.len() != other.len() {
return false;
}
for i in 0..self.len() {
if !self[i].eq_ignore_span(&other[i]) {
return false;
}
}
true
}
}
impl<T> EqIgnoreSpan for Box<T>
where
T: ?Sized + EqIgnoreSpan,
{
fn eq_ignore_span(&self, other: &Self) -> bool {
<T as EqIgnoreSpan>::eq_ignore_span(&self, &other)
}
}
impl<T> EqIgnoreSpan for Vec<T>
where
T: EqIgnoreSpan,
{
fn eq_ignore_span(&self, other: &Self) -> bool {
(&self[..]).eq_ignore_span(&other[..])
}
}

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#![feature(specialization)]
pub use self::ast_node::AstNode;
pub use self::eq_ignore_span::EqIgnoreSpan;
pub use self::span::{BytePos, Span};
mod ast_node;
mod eq_ignore_span;
mod span;

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use std::fmt::{self, Display, Formatter};
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct BytePos(pub u32);
impl Display for BytePos {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Span {
pub start: BytePos,
pub end: BytePos,
}
impl Span {
pub const DUMMY: Span = Span {
start: BytePos(0),
end: BytePos(0),
};
}
impl Default for Span {
#[inline]
fn default() -> Self {
Span::DUMMY
}
}
impl ::EqIgnoreSpan for Span {
/// always returns true
#[inline]
fn eq_ignore_span(&self, _: &Self) -> bool {
true
}
}

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[package]
name = "swc_macros"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[lib]
[dependencies]
ast_node = { path = "./ast_node" }
enum_kind = { path = "./enum_kind" }
eq_ignore_span = { path = "./eq_ignore_span" }

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[package]
name = "ast_node"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[lib]
proc-macro = true
[dependencies]
swc_macros_common = { path = "../common" }
pmutil = { git = "https://github.com/kdy1/rust-pmutil" }
proc-macro2 = { version = "0.1", features = ["unstable"] }
[dependencies.syn]
git = "https://github.com/dtolnay/syn"
features = ["full", "parsing", "printing", "extra-traits"]
[dependencies.synom]
git = "https://github.com/dtolnay/syn"

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#![feature(box_syntax, proc_macro)]
#[macro_use]
extern crate pmutil;
extern crate proc_macro2;
extern crate proc_macro;
#[macro_use]
extern crate swc_macros_common as common;
extern crate syn;
use common::prelude::*;
#[proc_macro_derive(AstNode)]
pub fn derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = parse::<DeriveInput>(input).expect("failed to parse input as DeriveInput");
let type_name = &input.ident;
let item: Item = Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
CONST_NAME: type_name.new_ident_with(|n| format!("_IMPL_AST_NODE_FOR_{}", n)),
Type: type_name,
},
{
#[allow(non_upper_case_globals)]
const CONST_NAME: () = {
extern crate swc_common as _swc_common;
impl _swc_common::AstNode for Type {}
()
};
}
))
.parse();
print("derive(AstNode)", item.into_tokens())
}
/// Alias for
///
/// `#[derive(Clone, Debug, Eq, PartialEq, Hash, EqIgnoreSpan, AstNode)]`
#[proc_macro_attribute]
pub fn ast_node(
_attr: proc_macro::TokenStream,
s: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
let item: Item = syn::parse(s).expect("failed to parse tokens as an item");
let tokens = pmutil::Quote::new_call_site().quote_with(smart_quote!(Vars { item }, {
#[derive(
Clone, Debug, Eq, PartialEq, Hash,
::swc_macros::EqIgnoreSpan,
::swc_macros::AstNode
)]
item
}));
print("ast_node", tokens)
}

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[package]
name = "swc_macros_common"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[dependencies]
pmutil = { git = "https://github.com/kdy1/rust-pmutil" }
proc-macro2 = { version = "0.1", features = ["unstable"] }
[dependencies.syn]
git = "https://github.com/dtolnay/syn"
features = ["full", "parsing", "printing", "extra-traits"]
[dependencies.synom]
git = "https://github.com/dtolnay/syn"
[dependencies.quote]
git = "https://github.com/dtolnay/quote"

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extern crate pmutil;
extern crate proc_macro2;
extern crate proc_macro;
extern crate quote;
extern crate syn;
use pmutil::synom_ext::FromSpan;
use proc_macro2::Span;
pub mod prelude;
pub fn call_site<T: FromSpan>() -> T {
FromSpan::from_span(Span::call_site())
}
/// `attr` - tokens inside `#[]`. e.g. `derive(EqIgnoreSpan)`, ast_node
pub fn print<T: Into<proc_macro2::TokenStream>>(
attr: &'static str,
t: T,
) -> proc_macro::TokenStream {
use std::env;
let tokens = t.into();
match env::var("PRINT_GENERATED") {
Ok(ref s) if s == "1" || attr == s => {}
_ => return tokens.into(),
}
println!("\n\tOutput of #[{}]:\n\t {}", attr, tokens);
tokens.into()
}
/// fail! is a panic! with location reporting.
#[macro_export]
macro_rules! fail {
($($args:tt)+) => {{
panic!("{}\n --> {}:{}:{}", format_args!($($args)*), file!(), line!(), column!());
}};
}
#[macro_export]
macro_rules! unimplemented {
($($args:tt)+) => {{
fail!("not yet implemented: {}", format_args!($($args)*));
}};
}
#[macro_export]
macro_rules! unreachable {
() => {{
fail!("internal error: unreacable");
}};
($($args:tt)+) => {{
fail!("internal error: unreacable\n{}", format_args!($($args)*));
}};
}

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pub use pmutil::prelude::*;
pub use quote::{ToTokens, Tokens};
pub use super::{call_site, print};
pub use proc_macro2::{Delimiter, Span, TokenNode, TokenStream, TokenTree};
pub use syn::*;
pub use syn::Span as SynSpan;
pub use syn::delimited::{Delimited, Element};

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[package]
name = "enum_kind"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[lib]
proc-macro = true
[dependencies]
swc_macros_common = { path = "../common" }
pmutil = { git = "https://github.com/kdy1/rust-pmutil" }
proc-macro2 = { version = "0.1", features = ["unstable"] }
[dependencies.syn]
git = "https://github.com/dtolnay/syn"
features = ["full", "parsing", "printing", "extra-traits"]
[dependencies.synom]
git = "https://github.com/dtolnay/syn"

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use common::prelude::*;
use input::*;
use util::{is_attr_name, is_bool};
pub fn expand(
Input {
attrs,
name,
variants,
generics,
vis,
}: Input,
) -> Item {
let items = attrs
.fns
.into_iter()
.map(|f| f.expand(&name, vis.clone(), &variants))
.map(ImplItem::Method)
.fold(Tokens::new(), |mut t, i| {
i.to_tokens(&mut t);
t
});
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
impl_generics,
name,
ty_generics,
where_clause,
items,
},
{
impl impl_generics name ty_generics where_clause {
items
}
}
))
.parse()
}
impl FnDef {
fn expand(self, enum_name: &Ident, vis: Visibility, variants: &[EnumVar]) -> ImplItemMethod {
let FnDef {
name,
return_type,
default_value,
} = self;
let name_span = name.span;
let arms = variants
.iter()
.map(|v| -> Arm {
// Pattern for this variant.
let pat = match v.data {
VariantData::Struct(ref _fields, _) => Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
EnumName: enum_name,
VariantName: v.name,
},
{ &EnumName::VariantName {..} }
))
.parse::<Pat>(),
VariantData::Tuple(ref _fields, _) => Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
EnumName: enum_name,
VariantName: v.name,
},
{ &EnumName::VariantName(..) }
))
.parse::<Pat>(),
VariantData::Unit => Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
EnumName: enum_name,
VariantName: v.name,
},
{ &EnumName::VariantName }
))
.parse::<Pat>(),
};
let body = {
let value = match v.attrs
.fn_values
.iter()
.find(|fn_val| fn_val.fn_name == name)
.map(|attr| attr.value.clone())
{
Some(Some(value)) => Some(value),
// if return type is bool and attribute is specified, it return true.
Some(None) if is_bool(&return_type) => Some(
ExprKind::Lit(Lit {
value: LitKind::Bool(true),
span: SynSpan(Span::call_site()),
}).into(),
),
_ => None,
};
value
.or_else(|| default_value.clone())
.map(Box::new)
.unwrap_or_else(|| {
panic!(
"value of {fn_name} for {variant} is not specified.",
fn_name = name,
variant = v.name
);
})
};
Arm {
pats: vec![pat].into(),
body,
// Forward cfg attributes.
attrs: v.attrs
.extras
.iter()
.filter(|attr| is_attr_name(attr, "cfg"))
.cloned()
.collect(),
rocket_token: call_site(),
comma: Some(call_site()),
guard: None,
if_token: None,
}
})
.collect();
// match self {}
let match_expr = ExprKind::Match(ExprMatch {
match_token: call_site(),
brace_token: call_site(),
expr: Quote::new_call_site()
.quote_with(smart_quote!(Vars {}, { self }))
.parse::<Expr>()
.into(),
arms,
}).into();
ImplItemMethod {
sig: MethodSig {
constness: Constness::NotConst,
unsafety: Unsafety::Normal,
abi: None,
ident: name,
// fn (&self) -> ReturnTpe
decl: FnDecl {
fn_token: name.span.as_token(),
paren_token: name.span.as_token(),
inputs: vec![
// TODO
FnArg::SelfRef(ArgSelfRef {
and_token: name_span.as_token(),
self_token: name_span.as_token(),
lifetime: None,
mutbl: Mutability::Immutable,
}),
].into(),
output: ReturnType::Type(return_type, name_span.as_token()),
generics: Default::default(),
variadic: false,
dot_tokens: None,
},
},
block: Block {
brace_token: call_site(),
stmts: vec![Stmt::Expr(Box::new(match_expr))],
},
// TODO
vis,
attrs: Default::default(),
defaultness: Defaultness::Final,
}
}
}

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use syn::*;
/// Parsed input.
#[derive(Debug)]
pub struct Input {
pub attrs: EnumAttrs,
/// Name of enum.
pub name: Ident,
pub vis: Visibility,
pub generics: Generics,
pub variants: Vec<EnumVar>,
}
///
#[derive(Debug, Default)]
pub struct EnumAttrs {
pub fns: Vec<FnDef>,
pub extras: Vec<Attribute>,
}
/// Function to generate.
///
/// `#[kind(function(name = "bool"))]`
#[derive(Debug)]
pub struct FnDef {
/// Name of function.
pub name: Ident,
pub return_type: Type,
pub default_value: Option<Expr>,
}
/// Variant of enum.
#[derive(Debug)]
pub struct EnumVar {
/// Name of variant.
pub name: Ident,
pub attrs: VariantAttrs,
pub data: VariantData,
}
/// Parsed attributes.
#[derive(Debug, Default)]
pub struct VariantAttrs {
pub fn_values: Vec<VariantAttr>,
pub extras: Vec<Attribute>,
}
#[derive(Debug)]
pub struct VariantAttr {
pub fn_name: Ident,
pub value: Option<Expr>,
}

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//! # Atributes on enum
//! ## functions
//! `#[kind(functions(name = "return_type"))]`
//!
//! ```rust
//! #[macro_use]
//! extern crate enum_kind;
//!
//! /// You can split attributes if you want.
//! #[derive(Kind)]
//! #[kind(functions(is_a = "bool", is_b = "bool"))]
//! #[kind(functions(is_a_or_b = "bool", num = "u8"))]
//! pub enum E {
//! #[kind(is_a, is_a_or_b, num = "1")]
//! A,
//! /// You can split attributes if you want.
//! #[kind(is_b)]
//! #[kind(is_a_or_b)]
//! #[kind(num = "2")]
//! B(u8),
//! /// Default value of bool is false if not specified and true if specified.
//! ///
//! /// Both struct like variant and tuple like variant are supported.
//! #[kind(num = "3")]
//! C {},
//! }
//! # fn main() {
//! assert!(E::A.is_a() && E::A.is_a_or_b() && !E::A.is_b());
//! assert_eq!(E::A.num(), 1);
//!
//! assert!(!E::B(0).is_a() && E::B(0).is_a_or_b() && E::B(0).is_b());
//! assert_eq!(E::B(0).num(), 2);
//!
//! assert!(!E::C{}.is_a() && !E::C{}.is_a_or_b() && !E::C{}.is_b());
//! assert_eq!(E::C{}.num(), 3);
//!
//!
//! # }
//! ```
//!
//! -----
//!
//! # Real usecase
//!
//! ```rust
//! #[macro_use]
//! extern crate enum_kind;
//!
//! #[derive(Kind, Debug, Clone, Eq, PartialEq, Hash)]
//! #[kind(function(precedence = "u8"))]
//! pub enum BinOpToken {
//! /// `==`
//! #[kind(precedence = "6")]
//! EqEq,
//! /// `!=`
//! #[kind(precedence = "6")]
//! NotEq,
//! /// `===`
//! #[kind(precedence = "6")]
//! EqEqEq,
//! /// `!==`
//! #[kind(precedence = "6")]
//! NotEqEq,
//! /// `<`
//! #[kind(precedence = "7")]
//! Lt,
//! /// `<=`
//! #[kind(precedence = "7")]
//! LtEq,
//! /// `>`
//! #[kind(precedence = "7")]
//! Gt,
//! #[kind(precedence = "7")]
//! /// `>=`
//! #[kind(precedence = "7")]
//! GtEq,
//! /// `<<`
//! #[kind(precedence = "8")]
//! LShift,
//! /// `>>`
//! #[kind(precedence = "8")]
//! RShift,
//! /// `>>>`
//! #[kind(precedence = "8")]
//! ZeroFillRShift,
//! /// `+`
//! #[kind(precedence = "9")]
//! Plus,
//! /// `-`
//! #[kind(precedence = "9")]
//! Minus,
//! /// `*`
//! #[kind(precedence = "10")]
//! Mul,
//! /// `/`
//! #[kind(precedence = "10")]
//! Div,
//! /// `%`
//! #[kind(precedence = "10")]
//! Mod,
//! /// `|`
//! #[kind(precedence = "3")]
//! BitOr,
//! /// `^`
//! #[kind(precedence = "4")]
//! BitXor,
//! /// `&`
//! #[kind(precedence = "5")]
//! BitAnd,
//! /// `in`
//! #[kind(precedence = "7")]
//! In,
//! /// `instanceof`
//! #[kind(precedence = "7")]
//! InstanceOf,
//! /// `**`
//! #[kind(precedence = "10")]
//! Exp,
//! /// `||`
//! #[kind(precedence = "1")]
//! LogicalOr,
//! /// `&&`
//! #[kind(precedence = "2")]
//! LogicalAnd,
//! }
//!
//! # fn main() {
//! # }
//! ```
//!
//!
//!
//!
//!
//!
//!
//!
#[macro_use]
extern crate pmutil;
extern crate proc_macro2;
extern crate proc_macro;
#[macro_use]
extern crate swc_macros_common as common;
extern crate syn;
#[macro_use]
extern crate synom;
use common::prelude::*;
mod expand;
mod input;
mod parse;
mod util;
#[proc_macro_derive(Kind, attributes(kind))]
pub fn derive_kind(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = syn::parse::<syn::DeriveInput>(input)
.map(From::from)
.expect("failed to parse derive input");
let item = expand::expand(input);
let tokens = item.into_tokens();
// println!("Expanded:{}", tokens);
tokens.into()
}

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use common::prelude::*;
use input::*;
use std::fmt::Display;
use std::ops::AddAssign;
use synom::Synom;
use util::{is_attr_name, is_bool};
impl From<DeriveInput> for Input {
fn from(
DeriveInput {
ident: name,
vis,
attrs,
generics,
body,
}: DeriveInput,
) -> Self {
let variants = match body {
Body::Enum(body) => body.variants
.into_iter()
.map(Element::into_item)
.map(From::from)
.collect(),
_ => panic!("#[derive(Kind)] only works for enums"),
};
Input {
name,
vis,
generics,
attrs: parse_attrs(attrs),
variants,
}
}
}
impl Synom for EnumAttrs {
named!(parse -> Self, do_parse!(
_function: syn!(Ident) >>
fns: parens!(
call!(Delimited::parse_terminated)
) >>
({
let fns: Delimited<_, tokens::Comma> = fns.0;
// TODO: Verify `functions`.
EnumAttrs {
fns: fns.into_vec(),
extras: Default::default(),
}
})
));
}
impl AddAssign<Result<Self, Attribute>> for EnumAttrs {
fn add_assign(&mut self, rhs: Result<Self, Attribute>) {
match rhs {
Ok(attr) => {
self.fns.extend(attr.fns);
self.extras.extend(attr.extras);
}
Err(attr) => self.extras.push(attr),
}
}
}
impl FnDef {
fn def_value_for_type(ty: &Type) -> Option<Expr> {
if is_bool(ty) {
return Some(
ExprKind::Lit(Lit {
value: LitKind::Bool(false),
span: SynSpan(Span::call_site()),
}).into(),
);
}
None
}
}
impl Synom for FnDef {
named!(parse -> Self, do_parse!(
name: syn!(Ident) >>
syn!(tokens::Eq) >>
return_type: syn!(Lit) >>
({
let return_type = parse_str_as_tokens(return_type);
FnDef {
default_value: FnDef::def_value_for_type(&return_type),
name,
return_type,
}
})
));
}
impl From<Variant> for EnumVar {
fn from(
Variant {
attrs,
data,
ident: name,
..
}: Variant,
) -> Self {
EnumVar {
name,
data,
attrs: parse_attrs(attrs),
}
}
}
impl Synom for VariantAttrs {
named!(parse -> Self, do_parse!(
fn_values: call!(Delimited::parse_terminated)
>>
({
let fn_values: Delimited<_, tokens::Comma> = fn_values;
VariantAttrs {
fn_values: fn_values.into_vec(),
extras: Default::default(),
}
})
));
}
impl AddAssign<Result<Self, Attribute>> for VariantAttrs {
fn add_assign(&mut self, rhs: Result<Self, Attribute>) {
match rhs {
Ok(attr) => {
self.fn_values.extend(attr.fn_values);
self.extras.extend(attr.extras);
}
Err(attr) => self.extras.push(attr),
}
}
}
impl Synom for VariantAttr {
named!(parse -> Self, do_parse!(
fn_name: syn!(Ident) >>
value: option!(
do_parse!(
syn!(tokens::Eq) >>
p: syn!(Lit) >>
({
parse_str_as_tokens(p)
})
)
) >>
(VariantAttr{ fn_name, value, })
)
);
}
/// Parse kind attr as MetaItem.
fn parse_attrs<T>(attrs: Vec<Attribute>) -> T
where
T: Default + Synom + AddAssign<Result<T, Attribute>>,
{
/// returns `tokens` where `tts` = `vec![Group(Paren, tokens)]`
fn unwrap_paren<I>(tts: I) -> TokenStream
where
I: IntoIterator<Item = TokenTree>,
{
let mut tts = tts.into_iter();
let mut tt = tts.next();
match tt {
Some(TokenTree {
kind: TokenNode::Group(Delimiter::Parenthesis, tokens),
span,
}) => {
if tts.next().is_none() {
return tokens;
}
tt = Some(TokenTree {
kind: TokenNode::Group(Delimiter::Parenthesis, tokens),
span,
});
}
_ => {}
}
panic!(
"expected tokens to be wrpped in a paren like #[kind(tokens)]\ngot {}",
match tt {
Some(ref tt) => tt as &Display,
None => &"None" as &Display,
}
)
}
let mut res = Default::default();
for attr in attrs {
if attr.is_sugared_doc {
continue;
}
if is_attr_name(&attr, "kind") {
let tts = attr.tts.into_iter().map(|t| {
// syn::parse doesn't like Vec<syn::TokenTree>.
t.0
});
let tts = unwrap_paren(tts);
let parsed: T = parse(tts.into())
.unwrap_or_else(|err| panic!("failed to parse attribute: {}", err));
res += Ok(parsed);
} else {
res += Err(attr)
}
}
res
}
/// Parse content of string literal as if it's tts.
fn parse_str_as_tokens<T>(lit: Lit) -> T
where
T: Synom,
{
let span = lit.span.0;
// WTF? Literal does not provide a way to get string...
let tt = lit.value.to_string();
// TODO:Remove '"' only for first and last.
let tts = tt.replace("\"", "")
.parse::<TokenStream>()
.expect("failed to create TokenStream for return type")
.into_iter()
.map(|tt| TokenTree { span, ..tt })
.collect::<TokenStream>();
parse(tts.into()).expect("failed to parse string literal")
}

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use syn::*;
pub fn is_bool(ty: &Type) -> bool {
match *ty {
Type::Path(TypePath {
qself: None,
path:
Path {
leading_colon: None,
ref segments,
},
}) => {
// check for bool
if segments.len() == 1 && segments.first().unwrap().item().ident.sym.as_str() == "bool"
{
return true;
}
}
_ => {}
}
false
}
pub fn is_attr_name(attr: &Attribute, name: &str) -> bool {
match *attr {
Attribute {
path:
Path {
leading_colon: None,
ref segments,
},
is_sugared_doc: false,
..
} if segments.len() == 1 =>
{
segments.first().unwrap().into_item().ident == name
}
_ => false,
}
}

23
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#[macro_use]
extern crate enum_kind;
#[derive(Debug, Kind)]
#[kind(functions(is_a = "bool", prec = "u8"))]
pub enum Tokens {
#[kind(is_a)]
#[kind(prec = "7")]
A,
#[kind(prec = "6")] StructLike {},
#[kind(prec = "5")] TupleLike(u8),
#[kind(prec = "6")]
#[cfg(feature = "not-used")]
Unused,
}
#[test]
fn simple_bool() {
assert!(Tokens::A.is_a());
assert!(!Tokens::StructLike {}.is_a());
assert!(!Tokens::TupleLike(5).is_a());
}

20
macros/eq_ignore_span/Cargo.toml Normal file
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[package]
name = "eq_ignore_span"
version = "0.1.0"
authors = ["강동윤 <kdy1@outlook.kr>"]
[lib]
proc-macro = true
[dependencies]
swc_macros_common = { path = "../common" }
pmutil = { git = "https://github.com/kdy1/rust-pmutil" }
proc-macro2 = { version = "0.1", features = ["unstable"] }
[dependencies.syn]
git = "https://github.com/dtolnay/syn"
features = ["full", "parsing", "printing", "extra-traits"]
[dependencies.synom]
git = "https://github.com/dtolnay/syn"

299
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#![feature(box_syntax)]
#[macro_use]
extern crate pmutil;
extern crate proc_macro2;
extern crate proc_macro;
#[macro_use]
extern crate swc_macros_common as common;
extern crate syn;
use common::prelude::*;
use std::iter;
#[proc_macro_derive(EqIgnoreSpan)]
pub fn derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = syn::parse(input).expect("failed to parse derive input");
print("derive(EqIgnoreSpan)", expand(input).into_tokens())
}
fn expand(input: DeriveInput) -> Item {
let type_name = &input.ident;
let body = expand_method_body(&input.ident, input.body);
Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
CONST_NAME: type_name.new_ident_with(|n| format!("_IMPL_EQ_IGNORE_SPAN_FOR_{}", n)),
Type: type_name,
body,
},
{
#[allow(non_upper_case_globals)]
const CONST_NAME: () = {
extern crate swc_common as _swc_common;
impl _swc_common::EqIgnoreSpan for Type {
fn eq_ignore_span(&self, __rhs: &Self) -> bool {
body
}
}
()
};
}
))
.parse()
}
/// Bind variants.
/// name is Some(EnumName) for enum, and none for struct.
fn bind_variant(
qual_name: Path,
v: &VariantData,
prefix: &str,
field_binding_mode: BindingMode,
) -> (Pat, Vec<Ident>) {
match *v {
VariantData::Unit => {
// EnumName::VariantName
let pat = Pat::Path(PatPath {
qself: None,
path: qual_name,
});
let pat = Pat::Ref(PatRef {
pat: box pat,
and_token: Span::call_site().as_token(),
mutbl: Mutability::Immutable,
});
// Unit tuple does not have field bindings
(pat, vec![])
}
VariantData::Struct(ref fields, brace_token) => {
let mut bindings = vec![];
let fields = fields
.iter()
.map(Element::into_item)
.map(|f| f.ident.expect("struct field must have ident"))
.map(|ident| {
let binded_ident = ident.new_ident_with(|s| format!("{}{}", prefix, s));
bindings.push(binded_ident.clone());
FieldPat {
ident,
pat: box PatIdent {
mode: field_binding_mode,
ident: binded_ident,
subpat: None,
at_token: None,
}.into(),
is_shorthand: false,
colon_token: Some(ident.span.as_token()),
attrs: Default::default(),
}
})
.collect();
// EnumName::VariantName { fields }
let pat = Pat::Struct(PatStruct {
path: qual_name,
fields,
brace_token,
dot2_token: None,
});
let pat = Pat::Ref(PatRef {
pat: box pat,
and_token: Span::call_site().as_token(),
mutbl: Mutability::Immutable,
});
(pat, bindings)
}
VariantData::Tuple(ref fields, paren_token) => {
// TODO
let mut bindings = vec![];
let pats = fields
.iter()
.map(Element::into_item)
.enumerate()
.map(|(i, _)| {
let binded_ident = Span::call_site().new_ident(format!("{}{}", prefix, i));
bindings.push(binded_ident.clone());
Pat::Ident(PatIdent {
mode: field_binding_mode,
ident: binded_ident,
subpat: None,
at_token: None,
})
})
.collect();
// EnumName::VariantName { fields }
let pat = Pat::TupleStruct(PatTupleStruct {
path: qual_name,
pat: PatTuple {
pats,
paren_token,
dots_pos: None,
dot2_token: None,
comma_token: None,
},
});
let pat = Pat::Ref(PatRef {
pat: box pat,
and_token: Span::call_site().as_token(),
mutbl: Mutability::Immutable,
});
(pat, bindings)
}
}
}
/// Creates method "eq_ignore_span"
fn expand_method_body(name: &Ident, body: Body) -> Expr {
/// qual_name: EnumName::VariantName for enum,
/// StructName for struct
fn arm_for_variant(qual_name: Path, data: &VariantData) -> Arm {
let span = Span::call_site();
let binding_mode = BindingMode::ByRef(span.as_token(), Mutability::Immutable);
let (lhs_pat, lhs_bindings) = bind_variant(qual_name.clone(), data, "lhs_", binding_mode);
let (rhs_pat, rhs_bindings) = bind_variant(qual_name, data, "rhs_", binding_mode);
let guard = (lhs_bindings.into_iter().zip(rhs_bindings))
.map(|(lhs, rhs)| -> Box<Expr> {
box Quote::from_tokens(&lhs)
.quote_with(smart_quote!(Vars { lhs, rhs }, {
_swc_ast_common::EqIgnoreSpan::eq_ignore_span(lhs, rhs)
}))
.parse()
})
.fold(None, |orig, additional_guard| match orig {
Some(orig) => Some(box Quote::new_call_site()
.quote_with(smart_quote!(
Vars {
orig,
additional_guard,
},
{ orig && additional_guard }
))
.parse()),
None => Some(additional_guard),
});
// (lhs_pat, rhs_pat) if guard => true
Arm {
attrs: Default::default(),
pats: vec![
Pat::Tuple(PatTuple {
pats: vec![lhs_pat, rhs_pat].into(),
comma_token: None,
dots_pos: None,
dot2_token: None,
paren_token: span.as_token(),
}),
].into(),
if_token: if guard.is_some() {
Some(span.as_token())
} else {
None
},
guard,
rocket_token: span.as_token(),
body: box ExprKind::Lit(Lit {
span: span.as_syn_span(),
value: LitKind::Bool(true),
}).into(),
comma: Some(span.as_token()),
}
}
/// match *self + delegate to variants
fn body_for_enum(name: &Ident, BodyEnum { variants, .. }: BodyEnum) -> Expr {
let span = Span::call_site();
let arms = variants
.into_iter()
.map(syn::delimited::Element::into_item)
.map(|v| {
arm_for_variant(
// EnumName::VariantName
Path {
leading_colon: None,
segments: vec![name.clone(), v.ident]
.into_iter()
.map(PathSegment::from)
.collect(),
},
&v.data,
)
})
.chain(iter::once({
// _ => false,
Arm {
attrs: Default::default(),
pats: vec![
Pat::Wild(PatWild {
underscore_token: span.as_token(),
}),
].into(),
if_token: None,
guard: None,
rocket_token: span.as_token(),
body: box ExprKind::Lit(Lit {
span: span.as_syn_span(),
value: LitKind::Bool(false),
}).into(),
comma: Some(span.as_token()),
}
}))
.collect();
ExprKind::Match(ExprMatch {
match_token: span.as_token(),
expr: box Quote::new(span)
.quote_with(smart_quote!(Vars {}, { (&*self, &*__rhs) }))
.parse(),
brace_token: span.as_token(),
arms,
}).into()
}
fn body_for_struct(name: &Ident, BodyStruct { data, .. }: BodyStruct) -> Expr {
let span = Span::call_site();
let arms = iter::once(arm_for_variant(name.clone().into(), &data))
.chain(iter::once({
// _ => false,
Arm {
attrs: Default::default(),
pats: vec![
Pat::Wild(PatWild {
underscore_token: span.as_token(),
}),
].into(),
if_token: None,
guard: None,
rocket_token: span.as_token(),
body: box ExprKind::Lit(Lit {
span: span.as_syn_span(),
value: LitKind::Bool(false),
}).into(),
comma: Some(span.as_token()),
}
}))
.collect();
ExprKind::Match(ExprMatch {
match_token: span.as_token(),
expr: box Quote::new(span)
.quote_with(smart_quote!(Vars {}, { (&*self, &*__rhs) }))
.parse(),
brace_token: span.as_token(),
arms,
}).into()
}
match body {
Body::Enum(e) => body_for_enum(name, e),
Body::Struct(s) => body_for_struct(name, s),
}
}

13
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//! Macros used by swc project.
#![allow(unused_import)]
#[macro_use]
extern crate ast_node;
#[macro_use]
extern crate enum_kind;
#[macro_use]
extern crate eq_ignore_span;
pub use ast_node::*;
pub use enum_kind::*;
pub use eq_ignore_span::*;

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src/lib.rs Normal file
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pub extern crate swc_common;
pub extern crate swc_macros;