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//! Rustdoc's JSON output interface
//!
//! These types are the public API exposed through the `--output-format json` flag. The [`Crate`]
//! struct is the root of the JSON blob and all other items are contained within.
use rustc_hash::FxHashMap;
use serde::{Deserialize, Serialize};
use std::path::PathBuf;
/// rustdoc format-version.
pub const FORMAT_VERSION: u32 = 27;
/// A `Crate` is the root of the emitted JSON blob. It contains all type/documentation information
/// about the language items in the local crate, as well as info about external items to allow
/// tools to find or link to them.
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct Crate {
/// The id of the root [`Module`] item of the local crate.
pub root: Id,
/// The version string given to `--crate-version`, if any.
pub crate_version: Option<String>,
/// Whether or not the output includes private items.
pub includes_private: bool,
/// A collection of all items in the local crate as well as some external traits and their
/// items that are referenced locally.
pub index: FxHashMap<Id, Item>,
/// Maps IDs to fully qualified paths and other info helpful for generating links.
pub paths: FxHashMap<Id, ItemSummary>,
/// Maps `crate_id` of items to a crate name and html_root_url if it exists.
pub external_crates: FxHashMap<u32, ExternalCrate>,
/// A single version number to be used in the future when making backwards incompatible changes
/// to the JSON output.
pub format_version: u32,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct ExternalCrate {
pub name: String,
pub html_root_url: Option<String>,
}
/// For external (not defined in the local crate) items, you don't get the same level of
/// information. This struct should contain enough to generate a link/reference to the item in
/// question, or can be used by a tool that takes the json output of multiple crates to find
/// the actual item definition with all the relevant info.
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct ItemSummary {
/// Can be used to look up the name and html_root_url of the crate this item came from in the
/// `external_crates` map.
pub crate_id: u32,
/// The list of path components for the fully qualified path of this item (e.g.
/// `["std", "io", "lazy", "Lazy"]` for `std::io::lazy::Lazy`).
///
/// Note that items can appear in multiple paths, and the one chosen is implementation
/// defined. Currently, this is the full path to where the item was defined. Eg
/// [`String`] is currently `["alloc", "string", "String"]` and [`HashMap`][`std::collections::HashMap`]
/// is `["std", "collections", "hash", "map", "HashMap"]`, but this is subject to change.
pub path: Vec<String>,
/// Whether this item is a struct, trait, macro, etc.
pub kind: ItemKind,
}
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct Item {
/// The unique identifier of this item. Can be used to find this item in various mappings.
pub id: Id,
/// This can be used as a key to the `external_crates` map of [`Crate`] to see which crate
/// this item came from.
pub crate_id: u32,
/// Some items such as impls don't have names.
pub name: Option<String>,
/// The source location of this item (absent if it came from a macro expansion or inline
/// assembly).
pub span: Option<Span>,
/// By default all documented items are public, but you can tell rustdoc to output private items
/// so this field is needed to differentiate.
pub visibility: Visibility,
/// The full markdown docstring of this item. Absent if there is no documentation at all,
/// Some("") if there is some documentation but it is empty (EG `#[doc = ""]`).
pub docs: Option<String>,
/// This mapping resolves [intra-doc links](https://github.com/rust-lang/rfcs/blob/master/text/1946-intra-rustdoc-links.md) from the docstring to their IDs
pub links: FxHashMap<String, Id>,
/// Stringified versions of the attributes on this item (e.g. `"#[inline]"`)
pub attrs: Vec<String>,
pub deprecation: Option<Deprecation>,
pub inner: ItemEnum,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Span {
/// The path to the source file for this span relative to the path `rustdoc` was invoked with.
pub filename: PathBuf,
/// Zero indexed Line and Column of the first character of the `Span`
pub begin: (usize, usize),
/// Zero indexed Line and Column of the last character of the `Span`
pub end: (usize, usize),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Deprecation {
pub since: Option<String>,
pub note: Option<String>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum Visibility {
Public,
/// For the most part items are private by default. The exceptions are associated items of
/// public traits and variants of public enums.
Default,
Crate,
/// For `pub(in path)` visibility. `parent` is the module it's restricted to and `path` is how
/// that module was referenced (like `"super::super"` or `"crate::foo::bar"`).
Restricted {
parent: Id,
path: String,
},
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct DynTrait {
/// All the traits implemented. One of them is the vtable, and the rest must be auto traits.
pub traits: Vec<PolyTrait>,
/// The lifetime of the whole dyn object
/// ```text
/// dyn Debug + 'static
/// ^^^^^^^
/// |
/// this part
/// ```
pub lifetime: Option<String>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
/// A trait and potential HRTBs
pub struct PolyTrait {
#[serde(rename = "trait")]
pub trait_: Path,
/// Used for Higher-Rank Trait Bounds (HRTBs)
/// ```text
/// dyn for<'a> Fn() -> &'a i32"
/// ^^^^^^^
/// |
/// this part
/// ```
pub generic_params: Vec<GenericParamDef>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum GenericArgs {
/// <'a, 32, B: Copy, C = u32>
AngleBracketed { args: Vec<GenericArg>, bindings: Vec<TypeBinding> },
/// Fn(A, B) -> C
Parenthesized { inputs: Vec<Type>, output: Option<Type> },
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum GenericArg {
Lifetime(String),
Type(Type),
Const(Constant),
Infer,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Constant {
#[serde(rename = "type")]
pub type_: Type,
pub expr: String,
pub value: Option<String>,
pub is_literal: bool,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct TypeBinding {
pub name: String,
pub args: GenericArgs,
pub binding: TypeBindingKind,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TypeBindingKind {
Equality(Term),
Constraint(Vec<GenericBound>),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Id(pub String);
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum ItemKind {
Module,
ExternCrate,
Import,
Struct,
StructField,
Union,
Enum,
Variant,
Function,
TypeAlias,
OpaqueTy,
Constant,
Trait,
TraitAlias,
Impl,
Static,
ForeignType,
Macro,
ProcAttribute,
ProcDerive,
AssocConst,
AssocType,
Primitive,
Keyword,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum ItemEnum {
Module(Module),
ExternCrate {
name: String,
rename: Option<String>,
},
Import(Import),
Union(Union),
Struct(Struct),
StructField(Type),
Enum(Enum),
Variant(Variant),
Function(Function),
Trait(Trait),
TraitAlias(TraitAlias),
Impl(Impl),
TypeAlias(TypeAlias),
OpaqueTy(OpaqueTy),
Constant(Constant),
Static(Static),
/// `type`s from an extern block
ForeignType,
/// Declarative macro_rules! macro
Macro(String),
ProcMacro(ProcMacro),
Primitive(Primitive),
AssocConst {
#[serde(rename = "type")]
type_: Type,
/// e.g. `const X: usize = 5;`
default: Option<String>,
},
AssocType {
generics: Generics,
bounds: Vec<GenericBound>,
/// e.g. `type X = usize;`
default: Option<Type>,
},
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Module {
pub is_crate: bool,
pub items: Vec<Id>,
/// If `true`, this module is not part of the public API, but it contains
/// items that are re-exported as public API.
pub is_stripped: bool,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Union {
pub generics: Generics,
pub fields_stripped: bool,
pub fields: Vec<Id>,
pub impls: Vec<Id>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Struct {
pub kind: StructKind,
pub generics: Generics,
pub impls: Vec<Id>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum StructKind {
/// A struct with no fields and no parentheses.
///
/// ```rust
/// pub struct Unit;
/// ```
Unit,
/// A struct with unnamed fields.
///
/// ```rust
/// pub struct TupleStruct(i32);
/// pub struct EmptyTupleStruct();
/// ```
///
/// All [`Id`]'s will point to [`ItemEnum::StructField`]. Private and
/// `#[doc(hidden)]` fields will be given as `None`
Tuple(Vec<Option<Id>>),
/// A struct with nammed fields.
///
/// ```rust
/// pub struct PlainStruct { x: i32 }
/// pub struct EmptyPlainStruct {}
/// ```
Plain { fields: Vec<Id>, fields_stripped: bool },
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Enum {
pub generics: Generics,
pub variants_stripped: bool,
pub variants: Vec<Id>,
pub impls: Vec<Id>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Variant {
/// Whether the variant is plain, a tuple-like, or struct-like. Contains the fields.
pub kind: VariantKind,
/// The discriminant, if explicitly specified.
pub discriminant: Option<Discriminant>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum VariantKind {
/// A variant with no parentheses
///
/// ```rust
/// enum Demo {
/// PlainVariant,
/// PlainWithDiscriminant = 1,
/// }
/// ```
Plain,
/// A variant with unnamed fields.
///
/// Unlike most of json, `#[doc(hidden)]` fields will be given as `None`
/// instead of being omitted, because order matters.
///
/// ```rust
/// enum Demo {
/// TupleVariant(i32),
/// EmptyTupleVariant(),
/// }
/// ```
Tuple(Vec<Option<Id>>),
/// A variant with named fields.
///
/// ```rust
/// enum Demo {
/// StructVariant { x: i32 },
/// EmptyStructVariant {},
/// }
/// ```
Struct { fields: Vec<Id>, fields_stripped: bool },
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Discriminant {
/// The expression that produced the discriminant.
///
/// Unlike `value`, this preserves the original formatting (eg suffixes,
/// hexadecimal, and underscores), making it unsuitable to be machine
/// interpreted.
///
/// In some cases, when the value is to complex, this may be `"{ _ }"`.
/// When this occurs is unstable, and may change without notice.
pub expr: String,
/// The numerical value of the discriminant. Stored as a string due to
/// JSON's poor support for large integers, and the fact that it would need
/// to store from [`i128::MIN`] to [`u128::MAX`].
pub value: String,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Header {
#[serde(rename = "const")]
pub const_: bool,
#[serde(rename = "unsafe")]
pub unsafe_: bool,
#[serde(rename = "async")]
pub async_: bool,
pub abi: Abi,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum Abi {
// We only have a concrete listing here for stable ABI's because their are so many
// See rustc_ast_passes::feature_gate::PostExpansionVisitor::check_abi for the list
Rust,
C { unwind: bool },
Cdecl { unwind: bool },
Stdcall { unwind: bool },
Fastcall { unwind: bool },
Aapcs { unwind: bool },
Win64 { unwind: bool },
SysV64 { unwind: bool },
System { unwind: bool },
Other(String),
}
/// Represents a function (including methods and other associated functions)
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Function {
pub decl: FnDecl,
pub generics: Generics,
pub header: Header,
pub has_body: bool,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Generics {
pub params: Vec<GenericParamDef>,
pub where_predicates: Vec<WherePredicate>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct GenericParamDef {
pub name: String,
pub kind: GenericParamDefKind,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum GenericParamDefKind {
Lifetime {
outlives: Vec<String>,
},
Type {
bounds: Vec<GenericBound>,
default: Option<Type>,
/// This is normally `false`, which means that this generic parameter is
/// declared in the Rust source text.
///
/// If it is `true`, this generic parameter has been introduced by the
/// compiler behind the scenes.
///
/// # Example
///
/// Consider
///
/// ```ignore (pseudo-rust)
/// pub fn f(_: impl Trait) {}
/// ```
///
/// The compiler will transform this behind the scenes to
///
/// ```ignore (pseudo-rust)
/// pub fn f<impl Trait: Trait>(_: impl Trait) {}
/// ```
///
/// In this example, the generic parameter named `impl Trait` (and which
/// is bound by `Trait`) is synthetic, because it was not originally in
/// the Rust source text.
synthetic: bool,
},
Const {
#[serde(rename = "type")]
type_: Type,
default: Option<String>,
},
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum WherePredicate {
BoundPredicate {
#[serde(rename = "type")]
type_: Type,
bounds: Vec<GenericBound>,
/// Used for Higher-Rank Trait Bounds (HRTBs)
/// ```text
/// where for<'a> &'a T: Iterator,"
/// ^^^^^^^
/// |
/// this part
/// ```
generic_params: Vec<GenericParamDef>,
},
RegionPredicate {
lifetime: String,
bounds: Vec<GenericBound>,
},
EqPredicate {
lhs: Type,
rhs: Term,
},
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum GenericBound {
TraitBound {
#[serde(rename = "trait")]
trait_: Path,
/// Used for Higher-Rank Trait Bounds (HRTBs)
/// ```text
/// where F: for<'a, 'b> Fn(&'a u8, &'b u8)
/// ^^^^^^^^^^^
/// |
/// this part
/// ```
generic_params: Vec<GenericParamDef>,
modifier: TraitBoundModifier,
},
Outlives(String),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TraitBoundModifier {
None,
Maybe,
MaybeConst,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum Term {
Type(Type),
Constant(Constant),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum Type {
/// Structs, enums, and unions
ResolvedPath(Path),
DynTrait(DynTrait),
/// Parameterized types
Generic(String),
/// Built in numeric (i*, u*, f*) types, bool, and char
Primitive(String),
/// `extern "ABI" fn`
FunctionPointer(Box<FunctionPointer>),
/// `(String, u32, Box<usize>)`
Tuple(Vec<Type>),
/// `[u32]`
Slice(Box<Type>),
/// [u32; 15]
Array {
#[serde(rename = "type")]
type_: Box<Type>,
len: String,
},
/// `impl TraitA + TraitB + ...`
ImplTrait(Vec<GenericBound>),
/// `_`
Infer,
/// `*mut u32`, `*u8`, etc.
RawPointer {
mutable: bool,
#[serde(rename = "type")]
type_: Box<Type>,
},
/// `&'a mut String`, `&str`, etc.
BorrowedRef {
lifetime: Option<String>,
mutable: bool,
#[serde(rename = "type")]
type_: Box<Type>,
},
/// Associated types like `<Type as Trait>::Name` and `T::Item` where
/// `T: Iterator` or inherent associated types like `Struct::Name`.
QualifiedPath {
name: String,
args: Box<GenericArgs>,
self_type: Box<Type>,
/// `None` iff this is an *inherent* associated type.
#[serde(rename = "trait")]
trait_: Option<Path>,
},
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Path {
pub name: String,
pub id: Id,
/// Generic arguments to the type
/// ```test
/// std::borrow::Cow<'static, str>
/// ^^^^^^^^^^^^^^
/// |
/// this part
/// ```
pub args: Option<Box<GenericArgs>>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct FunctionPointer {
pub decl: FnDecl,
/// Used for Higher-Rank Trait Bounds (HRTBs)
/// ```text
/// for<'c> fn(val: &'c i32) -> i32
/// ^^^^^^^
/// |
/// this part
/// ```
pub generic_params: Vec<GenericParamDef>,
pub header: Header,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct FnDecl {
/// List of argument names and their type.
///
/// Note that not all names will be valid identifiers, as some of
/// them may be patterns.
pub inputs: Vec<(String, Type)>,
pub output: Option<Type>,
pub c_variadic: bool,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Trait {
pub is_auto: bool,
pub is_unsafe: bool,
pub items: Vec<Id>,
pub generics: Generics,
pub bounds: Vec<GenericBound>,
pub implementations: Vec<Id>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct TraitAlias {
pub generics: Generics,
pub params: Vec<GenericBound>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Impl {
pub is_unsafe: bool,
pub generics: Generics,
pub provided_trait_methods: Vec<String>,
#[serde(rename = "trait")]
pub trait_: Option<Path>,
#[serde(rename = "for")]
pub for_: Type,
pub items: Vec<Id>,
pub negative: bool,
pub synthetic: bool,
pub blanket_impl: Option<Type>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub struct Import {
/// The full path being imported.
pub source: String,
/// May be different from the last segment of `source` when renaming imports:
/// `use source as name;`
pub name: String,
/// The ID of the item being imported. Will be `None` in case of re-exports of primitives:
/// ```rust
/// pub use i32 as my_i32;
/// ```
pub id: Option<Id>,
/// Whether this import uses a glob: `use source::*;`
pub glob: bool,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct ProcMacro {
pub kind: MacroKind,
pub helpers: Vec<String>,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum MacroKind {
/// A bang macro `foo!()`.
Bang,
/// An attribute macro `#[foo]`.
Attr,
/// A derive macro `#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]`
Derive,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct TypeAlias {
#[serde(rename = "type")]
pub type_: Type,
pub generics: Generics,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct OpaqueTy {
pub bounds: Vec<GenericBound>,
pub generics: Generics,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Static {
#[serde(rename = "type")]
pub type_: Type,
pub mutable: bool,
pub expr: String,
}
#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct Primitive {
pub name: String,
pub impls: Vec<Id>,
}
#[cfg(test)]
mod tests;