Rollup merge of rust-lang#100335 - aDotInTheVoid:rdj-resolved-path, r=GuillaumeGomez

Rustdoc-Json: Add `Path` type for traits.

Avoids using `Type` for trait fields, as a trait must always be a path, and not any other kind of type.

``@rustbot`` modify labels: +A-rustdoc-json +T-rustdoc

Closes rust-lang#100106

Author: compiler-errors

src/etc/check_missing_items.py

@@ -57,7 +57,7 @@ def check_generic_bound(bound):
     if "trait_bound" in bound:
         for param in bound["trait_bound"]["generic_params"]:
             check_generic_param(param)
-        check_type(bound["trait_bound"]["trait"])
+        check_path(bound["trait_bound"]["trait"])
 
 
 def check_decl(decl):
@@ -66,35 +66,35 @@ def check_decl(decl):
     if decl["output"]:
         check_type(decl["output"])
 
+def check_path(path):
+    args = path["args"]
+    if args:
+        if "angle_bracketed" in args:
+            for arg in args["angle_bracketed"]["args"]:
+                if "type" in arg:
+                    check_type(arg["type"])
+                elif "const" in arg:
+                    check_type(arg["const"]["type"])
+            for binding in args["angle_bracketed"]["bindings"]:
+                if "equality" in binding["binding"]:
+                    term = binding["binding"]["equality"]
+                    if "type" in term: check_type(term["type"])
+                    elif "const" in term: check_type(term["const"])
+                elif "constraint" in binding["binding"]:
+                    for bound in binding["binding"]["constraint"]:
+                        check_generic_bound(bound)
+        elif "parenthesized" in args:
+            for input_ty in args["parenthesized"]["inputs"]:
+                check_type(input_ty)
+            if args["parenthesized"]["output"]:
+                check_type(args["parenthesized"]["output"])
+    if not valid_id(path["id"]):
+        print("Type contained an invalid ID:", path["id"])
+        sys.exit(1)
 
 def check_type(ty):
     if ty["kind"] == "resolved_path":
-        for bound in ty["inner"]["param_names"]:
-            check_generic_bound(bound)
-        args = ty["inner"]["args"]
-        if args:
-            if "angle_bracketed" in args:
-                for arg in args["angle_bracketed"]["args"]:
-                    if "type" in arg:
-                        check_type(arg["type"])
-                    elif "const" in arg:
-                        check_type(arg["const"]["type"])
-                for binding in args["angle_bracketed"]["bindings"]:
-                    if "equality" in binding["binding"]:
-                        term = binding["binding"]["equality"]
-                        if "type" in term: check_type(term["type"])
-                        elif "const" in term: check_type(term["const"])
-                    elif "constraint" in binding["binding"]:
-                        for bound in binding["binding"]["constraint"]:
-                            check_generic_bound(bound)
-            elif "parenthesized" in args:
-                for input_ty in args["parenthesized"]["inputs"]:
-                    check_type(input_ty)
-                if args["parenthesized"]["output"]:
-                    check_type(args["parenthesized"]["output"])
-        if not valid_id(ty["inner"]["id"]):
-            print("Type contained an invalid ID:", ty["inner"]["id"])
-            sys.exit(1)
+        check_path(ty["inner"])
     elif ty["kind"] == "tuple":
         for ty in ty["inner"]:
             check_type(ty)
@@ -111,7 +111,7 @@ def check_type(ty):
         check_decl(ty["inner"]["decl"])
     elif ty["kind"] == "qualified_path":
         check_type(ty["inner"]["self_type"])
-        check_type(ty["inner"]["trait"])
+        check_path(ty["inner"]["trait"])
 
 
 work_list = set([crate["root"]])
@@ -174,7 +174,7 @@ def check_type(ty):
     elif item["kind"] == "impl":
         check_generics(item["inner"]["generics"])
         if item["inner"]["trait"]:
-            check_type(item["inner"]["trait"])
+            check_path(item["inner"]["trait"])
         if item["inner"]["blanket_impl"]:
             check_type(item["inner"]["blanket_impl"])
         check_type(item["inner"]["for"])

src/librustdoc/json/conversions.rs

@@ -428,10 +428,8 @@ impl FromWithTcx<clean::GenericBound> for GenericBound {
         use clean::GenericBound::*;
         match bound {
             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
-                // FIXME: should `trait_` be a clean::Path equivalent in JSON?
-                let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
                 GenericBound::TraitBound {
-                    trait_,
+                    trait_: trait_.into_tcx(tcx),
                     generic_params: generic_params.into_tcx(tcx),
                     modifier: from_trait_bound_modifier(modifier),
                 }
@@ -460,12 +458,7 @@ impl FromWithTcx<clean::Type> for Type {
         };
 
         match ty {
-            clean::Type::Path { path } => Type::ResolvedPath {
-                name: path.whole_name(),
-                id: from_item_id(path.def_id().into(), tcx),
-                args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
-                param_names: Vec::new(),
-            },
+            clean::Type::Path { path } => Type::ResolvedPath(path.into_tcx(tcx)),
             clean::Type::DynTrait(bounds, lt) => Type::DynTrait(DynTrait {
                 lifetime: lt.map(convert_lifetime),
                 traits: bounds.into_tcx(tcx),
@@ -487,16 +480,22 @@ impl FromWithTcx<clean::Type> for Type {
                 mutable: mutability == ast::Mutability::Mut,
                 type_: Box::new((*type_).into_tcx(tcx)),
             },
-            QPath { assoc, self_type, trait_, .. } => {
-                // FIXME: should `trait_` be a clean::Path equivalent in JSON?
-                let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
-                Type::QualifiedPath {
-                    name: assoc.name.to_string(),
-                    args: Box::new(assoc.args.clone().into_tcx(tcx)),
-                    self_type: Box::new((*self_type).into_tcx(tcx)),
-                    trait_: Box::new(trait_),
-                }
-            }
+            QPath { assoc, self_type, trait_, .. } => Type::QualifiedPath {
+                name: assoc.name.to_string(),
+                args: Box::new(assoc.args.clone().into_tcx(tcx)),
+                self_type: Box::new((*self_type).into_tcx(tcx)),
+                trait_: trait_.into_tcx(tcx),
+            },
+        }
+    }
+}
+
+impl FromWithTcx<clean::Path> for Path {
+    fn from_tcx(path: clean::Path, tcx: TyCtxt<'_>) -> Path {
+        Path {
+            name: path.whole_name(),
+            id: from_item_id(path.def_id().into(), tcx),
+            args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
         }
     }
 }
@@ -565,19 +564,14 @@ impl FromWithTcx<clean::PolyTrait> for PolyTrait {
         clean::PolyTrait { trait_, generic_params }: clean::PolyTrait,
         tcx: TyCtxt<'_>,
     ) -> Self {
-        PolyTrait {
-            trait_: clean::Type::Path { path: trait_ }.into_tcx(tcx),
-            generic_params: generic_params.into_tcx(tcx),
-        }
+        PolyTrait { trait_: trait_.into_tcx(tcx), generic_params: generic_params.into_tcx(tcx) }
     }
 }
 
 impl FromWithTcx<clean::Impl> for Impl {
     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
         let provided_trait_methods = impl_.provided_trait_methods(tcx);
         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
-        // FIXME: should `trait_` be a clean::Path equivalent in JSON?
-        let trait_ = trait_.map(|path| clean::Type::Path { path }.into_tcx(tcx));
         // FIXME: use something like ImplKind in JSON?
         let (synthetic, blanket_impl) = match kind {
             clean::ImplKind::Normal | clean::ImplKind::FakeVaradic => (false, None),
@@ -595,7 +589,7 @@ impl FromWithTcx<clean::Impl> for Impl {
                 .into_iter()
                 .map(|x| x.to_string())
                 .collect(),
-            trait_,
+            trait_: trait_.map(|path| path.into_tcx(tcx)),
             for_: for_.into_tcx(tcx),
             items: ids(items, tcx),
             negative: negative_polarity,

src/rustdoc-json-types/lib.rs

@@ -9,7 +9,7 @@ use std::path::PathBuf;
 use serde::{Deserialize, Serialize};
 
 /// rustdoc format-version.
-pub const FORMAT_VERSION: u32 = 17;
+pub const FORMAT_VERSION: u32 = 18;
 
 /// 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
@@ -133,7 +133,7 @@ pub struct DynTrait {
 /// A trait and potential HRTBs
 pub struct PolyTrait {
     #[serde(rename = "trait")]
-    pub trait_: Type,
+    pub trait_: Path,
     /// Used for Higher-Rank Trait Bounds (HRTBs)
     /// ```text
     /// dyn for<'a> Fn() -> &'a i32"
@@ -447,7 +447,7 @@ pub enum WherePredicate {
 pub enum GenericBound {
     TraitBound {
         #[serde(rename = "trait")]
-        trait_: Type,
+        trait_: Path,
         /// Used for Higher-Rank Trait Bounds (HRTBs)
         /// ```text
         /// where F: for<'a, 'b> Fn(&'a u8, &'b u8)
@@ -481,12 +481,7 @@ pub enum Term {
 #[serde(tag = "kind", content = "inner")]
 pub enum Type {
     /// Structs, enums, and traits
-    ResolvedPath {
-        name: String,
-        id: Id,
-        args: Option<Box<GenericArgs>>,
-        param_names: Vec<GenericBound>,
-    },
+    ResolvedPath(Path),
     DynTrait(DynTrait),
     /// Parameterized types
     Generic(String),
@@ -527,10 +522,24 @@ pub enum Type {
         args: Box<GenericArgs>,
         self_type: Box<Type>,
         #[serde(rename = "trait")]
-        trait_: Box<Type>,
+        trait_: 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,
@@ -574,7 +583,7 @@ pub struct Impl {
     pub generics: Generics,
     pub provided_trait_methods: Vec<String>,
     #[serde(rename = "trait")]
-    pub trait_: Option<Type>,
+    pub trait_: Option<Path>,
     #[serde(rename = "for")]
     pub for_: Type,
     pub items: Vec<Id>,

src/test/rustdoc-json/fns/generic_args.rs

@@ -14,7 +14,7 @@ pub trait GenericFoo<'a> {}
 // @is - "$.index[*][?(@.name=='generics')].inner.generics.params[0].name" '"F"'
 // @is - "$.index[*][?(@.name=='generics')].inner.generics.params[0].kind.type.default" 'null'
 // @count - "$.index[*][?(@.name=='generics')].inner.generics.params[0].kind.type.bounds[*]" 1
-// @is - "$.index[*][?(@.name=='generics')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.inner.id" '$foo'
+// @is - "$.index[*][?(@.name=='generics')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.id" '$foo'
 // @count - "$.index[*][?(@.name=='generics')].inner.decl.inputs[*]" 1
 // @is - "$.index[*][?(@.name=='generics')].inner.decl.inputs[0][0]" '"f"'
 // @is - "$.index[*][?(@.name=='generics')].inner.decl.inputs[0][1].kind" '"generic"'
@@ -24,12 +24,12 @@ pub fn generics<F: Foo>(f: F) {}
 // @is - "$.index[*][?(@.name=='impl_trait')].inner.generics.where_predicates" "[]"
 // @count - "$.index[*][?(@.name=='impl_trait')].inner.generics.params[*]" 1
 // @is - "$.index[*][?(@.name=='impl_trait')].inner.generics.params[0].name" '"impl Foo"'
-// @is - "$.index[*][?(@.name=='impl_trait')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.inner.id" $foo
+// @is - "$.index[*][?(@.name=='impl_trait')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.id" $foo
 // @count - "$.index[*][?(@.name=='impl_trait')].inner.decl.inputs[*]" 1
 // @is - "$.index[*][?(@.name=='impl_trait')].inner.decl.inputs[0][0]" '"f"'
 // @is - "$.index[*][?(@.name=='impl_trait')].inner.decl.inputs[0][1].kind" '"impl_trait"'
 // @count - "$.index[*][?(@.name=='impl_trait')].inner.decl.inputs[0][1].inner[*]" 1
-// @is - "$.index[*][?(@.name=='impl_trait')].inner.decl.inputs[0][1].inner[0].trait_bound.trait.inner.id" $foo
+// @is - "$.index[*][?(@.name=='impl_trait')].inner.decl.inputs[0][1].inner[0].trait_bound.trait.id" $foo
 pub fn impl_trait(f: impl Foo) {}
 
 // @count - "$.index[*][?(@.name=='where_clase')].inner.generics.params[*]" 3
@@ -43,11 +43,11 @@ pub fn impl_trait(f: impl Foo) {}
 
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[0].bound_predicate.type" '{"inner": "F", "kind": "generic"}'
 // @count - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[0].bound_predicate.bounds[*]" 1
-// @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[0].bound_predicate.bounds[0].trait_bound.trait.inner.id" $foo
+// @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[0].bound_predicate.bounds[0].trait_bound.trait.id" $foo
 
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.type" '{"inner": "G", "kind": "generic"}'
 // @count - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.bounds[*]" 1
-// @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.bounds[0].trait_bound.trait.inner.id" $generic_foo
+// @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.bounds[0].trait_bound.trait.id" $generic_foo
 // @count - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.bounds[0].trait_bound.generic_params[*]" 1
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.bounds[0].trait_bound.generic_params[0].name" \"\'a\"
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[1].bound_predicate.bounds[0].trait_bound.generic_params[0].kind" '{ "lifetime": { "outlives": [] } }'
@@ -57,7 +57,7 @@ pub fn impl_trait(f: impl Foo) {}
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.type.inner.lifetime" \"\'b\"
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.type.inner.type" '{"inner": "H", "kind": "generic"}'
 // @count - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.bounds[*]" 1
-// @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.bounds[0].trait_bound.trait.inner.id" $foo
+// @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.bounds[0].trait_bound.trait.id" $foo
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.bounds[0].trait_bound.generic_params" "[]"
 // @count - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.generic_params[*]" 1
 // @is - "$.index[*][?(@.name=='where_clase')].inner.generics.where_predicates[2].bound_predicate.generic_params[0].name" \"\'b\"

src/test/rustdoc-json/fns/generic_returns.rs

@@ -11,7 +11,7 @@ pub trait Foo {}
 // @is - "$.index[*][?(@.name=='get_foo')].inner.decl.inputs" []
 // @is - "$.index[*][?(@.name=='get_foo')].inner.decl.output.kind" '"impl_trait"'
 // @count - "$.index[*][?(@.name=='get_foo')].inner.decl.output.inner[*]" 1
-// @is - "$.index[*][?(@.name=='get_foo')].inner.decl.output.inner[0].trait_bound.trait.inner.id" $foo
+// @is - "$.index[*][?(@.name=='get_foo')].inner.decl.output.inner[0].trait_bound.trait.id" $foo
 pub fn get_foo() -> impl Foo {
     Fooer {}
 }

src/test/rustdoc-json/fns/generics.rs

@@ -10,17 +10,17 @@ pub trait Wham {}
 // @count - "$.index[*][?(@.name=='one_generic_param_fn')].inner.generics.params[*]" 1
 // @is    - "$.index[*][?(@.name=='one_generic_param_fn')].inner.generics.params[0].name" '"T"'
 // @has   - "$.index[*][?(@.name=='one_generic_param_fn')].inner.generics.params[0].kind.type.synthetic" false
-// @has   - "$.index[*][?(@.name=='one_generic_param_fn')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.inner.id" $wham_id
+// @has   - "$.index[*][?(@.name=='one_generic_param_fn')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.id" $wham_id
 // @is    - "$.index[*][?(@.name=='one_generic_param_fn')].inner.decl.inputs" '[["w", {"inner": "T", "kind": "generic"}]]'
 pub fn one_generic_param_fn<T: Wham>(w: T) {}
 
 // @is    - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.generics.where_predicates" []
 // @count - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.generics.params[*]" 1
 // @is    - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.generics.params[0].name" '"impl Wham"'
 // @has   - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.generics.params[0].kind.type.synthetic" true
-// @has   - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.inner.id" $wham_id
+// @has   - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.generics.params[0].kind.type.bounds[0].trait_bound.trait.id" $wham_id
 // @count - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.decl.inputs[*]" 1
 // @is    - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.decl.inputs[0][0]" '"w"'
 // @is    - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.decl.inputs[0][1].kind" '"impl_trait"'
-// @is    - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.decl.inputs[0][1].inner[0].trait_bound.trait.inner.id" $wham_id
+// @is    - "$.index[*][?(@.name=='one_synthetic_generic_param_fn')].inner.decl.inputs[0][1].inner[0].trait_bound.trait.id" $wham_id
 pub fn one_synthetic_generic_param_fn(w: impl Wham) {}

src/test/rustdoc-json/traits/supertrait.rs

@@ -9,18 +9,18 @@ pub trait Loud {}
 
 // @set very_loud_id = - "$.index[*][?(@.name=='VeryLoud')].id"
 // @count - "$.index[*][?(@.name=='VeryLoud')].inner.bounds[*]" 1
-// @is -    "$.index[*][?(@.name=='VeryLoud')].inner.bounds[0].trait_bound.trait.inner.id" $loud_id
+// @is -    "$.index[*][?(@.name=='VeryLoud')].inner.bounds[0].trait_bound.trait.id" $loud_id
 pub trait VeryLoud: Loud {}
 
 // @set sounds_good_id = - "$.index[*][?(@.name=='SoundsGood')].id"
 pub trait SoundsGood {}
 
 // @count - "$.index[*][?(@.name=='MetalBand')].inner.bounds[*]" 2
-// @is -    "$.index[*][?(@.name=='MetalBand')].inner.bounds[0].trait_bound.trait.inner.id" $very_loud_id
-// @is -    "$.index[*][?(@.name=='MetalBand')].inner.bounds[1].trait_bound.trait.inner.id" $sounds_good_id
+// @is -    "$.index[*][?(@.name=='MetalBand')].inner.bounds[0].trait_bound.trait.id" $very_loud_id
+// @is -    "$.index[*][?(@.name=='MetalBand')].inner.bounds[1].trait_bound.trait.id" $sounds_good_id
 pub trait MetalBand: VeryLoud + SoundsGood {}
 
 // @count - "$.index[*][?(@.name=='DnabLatem')].inner.bounds[*]" 2
-// @is -    "$.index[*][?(@.name=='DnabLatem')].inner.bounds[1].trait_bound.trait.inner.id" $very_loud_id
-// @is -    "$.index[*][?(@.name=='DnabLatem')].inner.bounds[0].trait_bound.trait.inner.id" $sounds_good_id
+// @is -    "$.index[*][?(@.name=='DnabLatem')].inner.bounds[1].trait_bound.trait.id" $very_loud_id
+// @is -    "$.index[*][?(@.name=='DnabLatem')].inner.bounds[0].trait_bound.trait.id" $sounds_good_id
 pub trait DnabLatem: SoundsGood + VeryLoud {}