item::parse
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4fffb2f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7a6a2bd
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "item"
+version = "0.1.0"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+license = "MIT/Apache-2.0"
+description = "Nom parser for Rust items"
+repository = "https://github.com/dtolnay/item"
+include = ["Cargo.toml", "src/**/*.rs"]
+
+[dependencies]
+nom = "1.2.4"
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+ any Contribution intentionally submitted for inclusion in the Work
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+
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..40b8817
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2016 The Rust 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.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1522056
--- /dev/null
+++ b/README.md
@@ -0,0 +1,39 @@
+Nom parser for Rust items
+=========================
+
+Parse Rust structs and enums without a Syntex dependency, intended for use with
+[Macros 1.1](https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md).
+
+```toml
+[dependencies]
+item = "0.1"
+```
+
+```rust
+extern crate item;
+
+let raw = "
+ #[derive(Debug, Clone)]
+ pub struct Item {
+ pub ident: Ident,
+ pub attrs: Vec<Attribute>,
+ }
+";
+
+let ast = item::parse(raw).unwrap();
+```
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..52eff8e
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,509 @@
+#[macro_use]
+extern crate nom;
+
+use nom::IResult;
+use nom::multispace as space;
+
+use std::str;
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Item {
+ pub ident: Ident,
+ pub vis: Visibility,
+ pub attrs: Vec<Attribute>,
+ pub generics: Generics,
+ pub body: Body,
+}
+
+pub type Ident = String;
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Attribute {
+ pub value: MetaItem,
+ pub is_sugared_doc: bool,
+}
+
+/// A compile-time attribute item.
+///
+/// E.g. `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum MetaItem {
+ /// Word meta item.
+ ///
+ /// E.g. `test` as in `#[test]`
+ Word(Ident),
+ /// List meta item.
+ ///
+ /// E.g. `derive(..)` as in `#[derive(..)]`
+ List(Ident, Vec<MetaItem>),
+ /// Name value meta item.
+ ///
+ /// E.g. `feature = "foo"` as in `#[feature = "foo"]`
+ NameValue(Ident, String),
+}
+
+#[derive(Debug, Clone, Eq, PartialEq, Default)]
+pub struct Generics {
+ pub lifetimes: Vec<LifetimeDef>,
+ pub ty_params: Vec<TyParam>,
+ pub where_clause: Vec<WherePredicate>,
+}
+
+/// A single predicate in a `where` clause
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum WherePredicate {
+ /// A type binding, e.g. `for<'c> Foo: Send+Clone+'c`
+ BoundPredicate(WhereBoundPredicate),
+ /// A lifetime predicate, e.g. `'a: 'b+'c`
+ RegionPredicate(WhereRegionPredicate),
+}
+
+/// A type bound.
+///
+/// E.g. `for<'c> Foo: Send+Clone+'c`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct WhereBoundPredicate {
+ /// Any lifetimes from a `for` binding
+ pub bound_lifetimes: Vec<LifetimeDef>,
+ /// The type being bounded
+ pub bounded_ty: Ty,
+ /// Trait and lifetime bounds (`Clone+Send+'static`)
+ pub bounds: Vec<TyParamBound>,
+}
+
+/// A lifetime predicate.
+///
+/// E.g. `'a: 'b+'c`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct WhereRegionPredicate {
+ pub lifetime: Lifetime,
+ pub bounds: Vec<Lifetime>,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct LifetimeDef {
+ pub lifetime: Lifetime,
+ pub bounds: Vec<Lifetime>,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Lifetime {
+ pub ident: Ident,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct TyParam {
+ pub ident: Ident,
+ pub bounds: Vec<TyParamBound>,
+ pub default: Option<Ty>,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum TyParamBound {
+ MaybeSized,
+ Region(Lifetime),
+ Trait(PolyTraitRef),
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct PolyTraitRef {
+ /// The `'a` in `<'a> Foo<&'a T>`
+ pub bound_lifetimes: Vec<LifetimeDef>,
+ /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
+ pub trait_ref: Path,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Path {
+ pub global: bool,
+ pub segments: Vec<PathSegment>,
+}
+
+/// A segment of a path: an identifier, an optional lifetime, and a set of types.
+///
+/// E.g. `std`, `String` or `Box<T>`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct PathSegment {
+ pub ident: Ident,
+ pub parameters: PathParameters,
+}
+
+impl PathSegment {
+ pub fn ident(ident: Ident) -> Self {
+ PathSegment {
+ ident: ident,
+ parameters: PathParameters::none(),
+ }
+ }
+}
+
+/// Parameters of a path segment.
+///
+/// E.g. `<A, B>` as in `Foo<A, B>` or `(A, B)` as in `Foo(A, B)`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum PathParameters {
+ /// The `<'a, A, B, C>` in `foo::bar::baz::<'a, A, B, C>`
+ AngleBracketed(AngleBracketedParameterData),
+ /// The `(A, B)` and `C` in `Foo(A, B) -> C`
+ Parenthesized(ParenthesizedParameterData),
+}
+
+impl PathParameters {
+ pub fn none() -> Self {
+ PathParameters::AngleBracketed(AngleBracketedParameterData::default())
+ }
+}
+
+/// A path like `Foo<'a, T>`
+#[derive(Debug, Clone, Eq, PartialEq, Default)]
+pub struct AngleBracketedParameterData {
+ /// The lifetime parameters for this path segment.
+ pub lifetimes: Vec<Lifetime>,
+ /// The type parameters for this path segment, if present.
+ pub types: Vec<Ty>,
+ /// Bindings (equality constraints) on associated types, if present.
+ ///
+ /// E.g., `Foo<A=Bar>`.
+ pub bindings: Vec<TypeBinding>,
+}
+
+/// Bind a type to an associated type: `A=Foo`.
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct TypeBinding {
+ pub ident: Ident,
+ pub ty: Ty,
+}
+
+/// A path like `Foo(A,B) -> C`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct ParenthesizedParameterData {
+ /// `(A, B)`
+ pub inputs: Vec<Ty>,
+ /// `C`
+ pub output: Option<Ty>,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Body {
+ Enum(Vec<Variant>),
+ Struct(Style, Vec<Field>),
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Variant {
+ pub ident: Ident,
+ pub attrs: Vec<Attribute>,
+ pub style: Style,
+ pub fields: Vec<Field>,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Style {
+ Struct,
+ Tuple,
+ Unit,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Field {
+ pub ident: Option<Ident>,
+ pub vis: Visibility,
+ pub attrs: Vec<Attribute>,
+ pub ty: Ty,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Visibility {
+ Public,
+ Inherited,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Ty {
+ /// A variable-length array (`[T]`)
+ Vec(Box<Ty>),
+ /// A fixed length array (`[T; n]`)
+ FixedLengthVec(Box<Ty>, usize),
+ /// A raw pointer (`*const T` or `*mut T`)
+ Ptr(Box<MutTy>),
+ /// A reference (`&'a T` or `&'a mut T`)
+ Rptr(Option<Lifetime>, Box<MutTy>),
+ /// A bare function (e.g. `fn(usize) -> bool`)
+ BareFn(Box<BareFnTy>),
+ /// The never type (`!`)
+ Never,
+ /// A tuple (`(A, B, C, D, ...)`)
+ Tup(Vec<Ty>),
+ /// A path (`module::module::...::Type`), optionally
+ /// "qualified", e.g. `<Vec<T> as SomeTrait>::SomeType`.
+ ///
+ /// Type parameters are stored in the Path itself
+ Path(Option<QSelf>, Path),
+ /// Something like `A+B`. Note that `B` must always be a path.
+ ObjectSum(Box<Ty>, Vec<TyParamBound>),
+ /// A type like `for<'a> Foo<&'a Bar>`
+ PolyTraitRef(Vec<TyParamBound>),
+ /// An `impl TraitA+TraitB` type.
+ ImplTrait(Vec<TyParamBound>),
+ /// No-op; kept solely so that we can pretty-print faithfully
+ Paren(Box<Ty>),
+ /// TyKind::Infer means the type should be inferred instead of it having been
+ /// specified. This can appear anywhere in a type.
+ Infer,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct MutTy {
+ pub ty: Ty,
+ pub mutbl: Mutability,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Mutability {
+ Mutable,
+ Immutable,
+}
+
+/// The explicit Self type in a "qualified path". The actual
+/// path, including the trait and the associated item, is stored
+/// separately. `position` represents the index of the associated
+/// item qualified with this Self type.
+///
+/// ```rust,ignore
+/// <Vec<T> as a::b::Trait>::AssociatedItem
+/// ^~~~~ ~~~~~~~~~~~~~~^
+/// ty position = 3
+///
+/// <Vec<T>>::AssociatedItem
+/// ^~~~~ ^
+/// ty position = 0
+/// ```
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct QSelf {
+ pub ty: Box<Ty>,
+ pub position: usize
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct BareFnTy {
+ pub lifetimes: Vec<LifetimeDef>,
+ pub decl: FnDecl
+}
+
+/// Header (not the body) of a function declaration.
+///
+/// E.g. `fn foo(bar: baz)`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct FnDecl {
+ pub inputs: Vec<Arg>,
+ pub output: FunctionRetTy,
+}
+
+/// An argument in a function header.
+///
+/// E.g. `bar: usize` as in `fn foo(bar: usize)`
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct Arg {
+ pub pat: Option<Ident>,
+ pub ty: Ty,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum FunctionRetTy {
+ /// Return type is not specified.
+ ///
+ /// Functions default to `()` and
+ /// closures default to inference. Span points to where return
+ /// type would be inserted.
+ Default,
+ /// Everything else
+ Ty(Ty),
+}
+
+named!(attribute<&str, Attribute>, chain!(
+ space? ~
+ tag_s!("#[") ~
+ space? ~
+ first: word ~
+ space? ~
+ tag_s!("(") ~
+ inner: separated_list!(tag_s!(", "), word) ~
+ tag_s!(")") ~
+ space? ~
+ tag_s!("]") ,
+ || { return Attribute {
+ value: MetaItem::List(first.to_string(), inner.into_iter().map(|w|
+ MetaItem::Word(w.to_string())
+ ).collect()),
+ is_sugared_doc: false,
+ } }
+));
+
+named!(visibility<&str, Visibility>,
+ map!(opt!(terminated!(tag_s!("pub"), space)), |tag| match tag {
+ Some(_) => Visibility::Public,
+ None => Visibility::Inherited,
+ })
+);
+
+fn ident_ch(ch: char) -> bool {
+ ch.is_alphanumeric() || ch == '_'
+}
+
+named!(word<&str, Ident>, map!(take_while1_s!(ident_ch), String::from));
+
+named!(path_segment<&str, PathSegment>, alt!(
+ chain!(
+ ident: word ~
+ space? ~
+ tag_s!("<") ~
+ types: many0!(ty) ~
+ space? ~
+ tag_s!(">") ,
+ || {
+ PathSegment {
+ ident: ident,
+ parameters: PathParameters::AngleBracketed(
+ AngleBracketedParameterData {
+ lifetimes: Vec::new(),
+ types: types,
+ bindings: Vec::new(),
+ }
+ ),
+ }
+ }
+ )
+ |
+ map!(word, |n| PathSegment::ident(n))
+));
+
+named!(ty<&str, Ty>, chain!(
+ global: tag_s!("::")? ~
+ segments: separated_nonempty_list!(tag_s!("::"), path_segment) ,
+ || {
+ Ty::Path(None, Path {
+ global: global.is_some(),
+ segments: segments,
+ })
+ }
+));
+
+/*
+ /// A variable-length array (`[T]`)
+ Vec(Box<Ty>),
+ /// A fixed length array (`[T; n]`)
+ FixedLengthVec(Box<Ty>, usize),
+ /// A raw pointer (`*const T` or `*mut T`)
+ Ptr(Box<MutTy>),
+ /// A reference (`&'a T` or `&'a mut T`)
+ Rptr(Option<Lifetime>, Box<MutTy>),
+ /// A bare function (e.g. `fn(usize) -> bool`)
+ BareFn(Box<BareFnTy>),
+ /// The never type (`!`)
+ Never,
+ /// A tuple (`(A, B, C, D, ...)`)
+ Tup(Vec<Ty>),
+ /// A path (`module::module::...::Type`), optionally
+ /// "qualified", e.g. `<Vec<T> as SomeTrait>::SomeType`.
+ ///
+ /// Type parameters are stored in the Path itself
+ Path(Option<QSelf>, Path),
+ /// Something like `A+B`. Note that `B` must always be a path.
+ ObjectSum(Box<Ty>, Vec<TyParamBound>),
+ /// A type like `for<'a> Foo<&'a Bar>`
+ PolyTraitRef(Vec<TyParamBound>),
+ /// An `impl TraitA+TraitB` type.
+ ImplTrait(Vec<TyParamBound>),
+ /// No-op; kept solely so that we can pretty-print faithfully
+ Paren(Box<Ty>),
+ /// TyKind::Infer means the type should be inferred instead of it having been
+ /// specified. This can appear anywhere in a type.
+ Infer,
+*/
+
+named!(field<&str, Field>, chain!(
+ space? ~
+ vis: visibility ~
+ ident: word ~
+ space? ~
+ tag_s!(":") ~
+ space? ~
+ ty: ty ,
+ || {
+ Field {
+ ident: Some(ident),
+ vis: vis,
+ attrs: Vec::new(),
+ ty: ty,
+ }
+ }
+));
+
+named!(struct_body<&str, Body>, alt!(
+ chain!(
+ tag_s!("{") ~
+ fields: separated_list!(tag_s!(","), field) ~
+ space? ~
+ tag_s!(",")? ~
+ space? ~
+ tag_s!("}") ,
+ || { Body::Struct(Style::Struct, fields) }
+ )
+ |
+ chain!(
+ tag_s!("(") ~
+ separated_list!(tag_s!(","), chain!(
+ space? ~
+ vis: visibility ~
+ ty: ty ,
+ || {}
+ )) ~
+ space? ~
+ tag_s!(",")? ~
+ space? ~
+ tag_s!(")") ,
+ || { Body::Struct(Style::Tuple, Vec::new()) }
+ )
+ |
+ map!(tag_s!(";"), |_| Body::Struct(Style::Unit, Vec::new()))
+));
+
+named!(item<&str, Item>, chain!(
+ attrs: many0!(attribute) ~
+ space? ~
+ vis: visibility ~
+ tag_s!("struct") ~
+ space ~
+ ident: word ~
+ space? ~
+ body: struct_body ~
+ space? ,
+ || { return Item {
+ ident: ident,
+ vis: vis,
+ attrs: attrs,
+ generics: Generics::default(),
+ body: body,
+ } }
+));
+
+pub fn parse(input: &str) -> Result<Item, String> {
+ match item(input) {
+ IResult::Done(rest, ast) => {
+ if rest.is_empty() {
+ Ok(ast)
+ } else {
+ Err(format!("more than a single input item: {:?}", rest))
+ }
+ }
+ IResult::Error(nom::Err::Code(kind)) |
+ IResult::Error(nom::Err::Node(kind, _)) => {
+ Err(format!("failed to parse {:?}", kind))
+ }
+ IResult::Error(nom::Err::Position(kind, pos)) |
+ IResult::Error(nom::Err::NodePosition(kind, pos, _)) => {
+ Err(format!("failed to parse {:?}: {:?}", kind, pos))
+ }
+ IResult::Incomplete(_) => Err("incomplete input item".to_string()),
+ }
+}
diff --git a/tests/test.rs b/tests/test.rs
new file mode 100644
index 0000000..9268495
--- /dev/null
+++ b/tests/test.rs
@@ -0,0 +1,64 @@
+extern crate item;
+use item::*;
+
+fn simple_ty(ident: &str) -> Ty {
+ Ty::Path(None, Path {
+ global: false,
+ segments: vec![PathSegment::ident(ident.to_string())],
+ })
+}
+#[test]
+fn test_struct() {
+ let raw = "
+ #[derive(Debug, Clone)]
+ pub struct Item {
+ pub ident: Ident,
+ pub attrs: Vec<Attribute>,
+ }
+ ";
+
+ let expected = Item {
+ ident: "Item".to_string(),
+ vis: Visibility::Public,
+ attrs: vec![
+ Attribute {
+ value: MetaItem::List("derive".to_string(), vec![
+ MetaItem::Word("Debug".to_string()),
+ MetaItem::Word("Clone".to_string()),
+ ]),
+ is_sugared_doc: false,
+ },
+ ],
+ generics: Generics::default(),
+ body: Body::Struct(Style::Struct, vec![
+ Field {
+ ident: Some("ident".to_string()),
+ vis: Visibility::Public,
+ attrs: Vec::new(),
+ ty: simple_ty("Ident"),
+ },
+ Field {
+ ident: Some("attrs".to_string()),
+ vis: Visibility::Public,
+ attrs: Vec::new(),
+ ty: Ty::Path(None, Path {
+ global: false,
+ segments: vec![
+ PathSegment {
+ ident: "Vec".to_string(),
+ parameters: PathParameters::AngleBracketed(
+ AngleBracketedParameterData {
+ lifetimes: Vec::new(),
+ types: vec![simple_ty("Attribute")],
+ bindings: Vec::new(),
+ },
+ ),
+ }
+ ],
+ }),
+ },
+ ]),
+ };
+
+ assert_eq!(expected, parse(raw).unwrap());
+}