From 35161fff39430bd1d41bf92f28cce10d0cfb5c0e Mon Sep 17 00:00:00 2001 From: David Tolnay Date: Sat, 3 Sep 2016 11:33:15 -0700 Subject: [PATCH] item::parse --- .gitignore | 2 + Cargo.toml | 11 ++ LICENSE-APACHE | 201 +++++++++++++++++++ LICENSE-MIT | 25 +++ README.md | 39 ++++ src/lib.rs | 509 +++++++++++++++++++++++++++++++++++++++++++++++++ tests/test.rs | 64 +++++++ 7 files changed, 851 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.toml create mode 100644 LICENSE-APACHE create mode 100644 LICENSE-MIT create mode 100644 README.md create mode 100644 src/lib.rs create mode 100644 tests/test.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000000..4fffb2f89c --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/target +/Cargo.lock diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000000..7a6a2bdeab --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "item" +version = "0.1.0" +authors = ["David Tolnay "] +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 0000000000..16fe87b06e --- /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. 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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 0000000000..1522056857 --- /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, + } +"; + +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 0000000000..52eff8e118 --- /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, + 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), + /// 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, + pub ty_params: Vec, + pub where_clause: Vec, +} + +/// 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, + /// The type being bounded + pub bounded_ty: Ty, + /// Trait and lifetime bounds (`Clone+Send+'static`) + pub bounds: Vec, +} + +/// A lifetime predicate. +/// +/// E.g. `'a: 'b+'c` +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct WhereRegionPredicate { + pub lifetime: Lifetime, + pub bounds: Vec, +} + +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct LifetimeDef { + pub lifetime: Lifetime, + pub bounds: Vec, +} + +#[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, + pub default: Option, +} + +#[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, + /// 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, +} + +/// A segment of a path: an identifier, an optional lifetime, and a set of types. +/// +/// E.g. `std`, `String` or `Box` +#[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. `` as in `Foo` 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, + /// The type parameters for this path segment, if present. + pub types: Vec, + /// Bindings (equality constraints) on associated types, if present. + /// + /// E.g., `Foo`. + pub bindings: Vec, +} + +/// 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, + /// `C` + pub output: Option, +} + +#[derive(Debug, Clone, Eq, PartialEq)] +pub enum Body { + Enum(Vec), + Struct(Style, Vec), +} + +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct Variant { + pub ident: Ident, + pub attrs: Vec, + pub style: Style, + pub fields: Vec, +} + +#[derive(Debug, Clone, Eq, PartialEq)] +pub enum Style { + Struct, + Tuple, + Unit, +} + +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct Field { + pub ident: Option, + pub vis: Visibility, + pub attrs: Vec, + 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), + /// A fixed length array (`[T; n]`) + FixedLengthVec(Box, usize), + /// A raw pointer (`*const T` or `*mut T`) + Ptr(Box), + /// A reference (`&'a T` or `&'a mut T`) + Rptr(Option, Box), + /// A bare function (e.g. `fn(usize) -> bool`) + BareFn(Box), + /// The never type (`!`) + Never, + /// A tuple (`(A, B, C, D, ...)`) + Tup(Vec), + /// A path (`module::module::...::Type`), optionally + /// "qualified", e.g. ` as SomeTrait>::SomeType`. + /// + /// Type parameters are stored in the Path itself + Path(Option, Path), + /// Something like `A+B`. Note that `B` must always be a path. + ObjectSum(Box, Vec), + /// A type like `for<'a> Foo<&'a Bar>` + PolyTraitRef(Vec), + /// An `impl TraitA+TraitB` type. + ImplTrait(Vec), + /// No-op; kept solely so that we can pretty-print faithfully + Paren(Box), + /// 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 +/// as a::b::Trait>::AssociatedItem +/// ^~~~~ ~~~~~~~~~~~~~~^ +/// ty position = 3 +/// +/// >::AssociatedItem +/// ^~~~~ ^ +/// ty position = 0 +/// ``` +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct QSelf { + pub ty: Box, + pub position: usize +} + +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct BareFnTy { + pub lifetimes: Vec, + 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, + 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, + 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), + /// A fixed length array (`[T; n]`) + FixedLengthVec(Box, usize), + /// A raw pointer (`*const T` or `*mut T`) + Ptr(Box), + /// A reference (`&'a T` or `&'a mut T`) + Rptr(Option, Box), + /// A bare function (e.g. `fn(usize) -> bool`) + BareFn(Box), + /// The never type (`!`) + Never, + /// A tuple (`(A, B, C, D, ...)`) + Tup(Vec), + /// A path (`module::module::...::Type`), optionally + /// "qualified", e.g. ` as SomeTrait>::SomeType`. + /// + /// Type parameters are stored in the Path itself + Path(Option, Path), + /// Something like `A+B`. Note that `B` must always be a path. + ObjectSum(Box, Vec), + /// A type like `for<'a> Foo<&'a Bar>` + PolyTraitRef(Vec), + /// An `impl TraitA+TraitB` type. + ImplTrait(Vec), + /// No-op; kept solely so that we can pretty-print faithfully + Paren(Box), + /// 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 { + 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 0000000000..9268495598 --- /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, + } + "; + + 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()); +}