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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::collections::{BTreeSet, HashMap};
use crate::*;
use anyhow::{bail, Result};
type MetadataGroupMap = HashMap<String, MetadataGroup>;
// Create empty metadata groups based on the metadata items.
pub fn create_metadata_groups(items: &[Metadata]) -> MetadataGroupMap {
// Map crate names to MetadataGroup instances
items
.iter()
.filter_map(|i| match i {
Metadata::Namespace(namespace) => {
let group = MetadataGroup {
namespace: namespace.clone(),
namespace_docstring: None,
items: BTreeSet::new(),
};
Some((namespace.crate_name.clone(), group))
}
Metadata::UdlFile(udl) => {
let namespace = NamespaceMetadata {
crate_name: udl.module_path.clone(),
name: udl.namespace.clone(),
};
let group = MetadataGroup {
namespace,
namespace_docstring: None,
items: BTreeSet::new(),
};
Some((udl.module_path.clone(), group))
}
_ => None,
})
.collect::<HashMap<_, _>>()
}
/// Consume the items into the previously created metadata groups.
pub fn group_metadata(group_map: &mut MetadataGroupMap, items: Vec<Metadata>) -> Result<()> {
for item in items {
if matches!(&item, Metadata::Namespace(_)) {
continue;
}
let crate_name = calc_crate_name(item.module_path()).to_owned(); // XXX - kill clone?
let item = fixup_external_type(item, group_map);
let group = match group_map.get_mut(&crate_name) {
Some(ns) => ns,
None => bail!("Unknown namespace for {item:?} ({crate_name})"),
};
if group.items.contains(&item) {
bail!("Duplicate metadata item: {item:?}");
}
group.add_item(item);
}
Ok(())
}
#[derive(Debug)]
pub struct MetadataGroup {
pub namespace: NamespaceMetadata,
pub namespace_docstring: Option<String>,
pub items: BTreeSet<Metadata>,
}
impl MetadataGroup {
pub fn add_item(&mut self, item: Metadata) {
self.items.insert(item);
}
}
pub fn fixup_external_type(item: Metadata, group_map: &MetadataGroupMap) -> Metadata {
let crate_name = calc_crate_name(item.module_path()).to_owned();
let converter = ExternalTypeConverter {
crate_name: &crate_name,
crate_to_namespace: group_map,
};
converter.convert_item(item)
}
/// Convert metadata items by replacing types from external crates with Type::External
struct ExternalTypeConverter<'a> {
crate_name: &'a str,
crate_to_namespace: &'a MetadataGroupMap,
}
impl<'a> ExternalTypeConverter<'a> {
fn crate_to_namespace(&self, crate_name: &str) -> String {
self.crate_to_namespace
.get(crate_name)
.unwrap_or_else(|| panic!("Can't find namespace for module {crate_name}"))
.namespace
.name
.clone()
}
fn convert_item(&self, item: Metadata) -> Metadata {
match item {
Metadata::Func(meta) => Metadata::Func(FnMetadata {
inputs: self.convert_params(meta.inputs),
return_type: self.convert_optional(meta.return_type),
throws: self.convert_optional(meta.throws),
..meta
}),
Metadata::Method(meta) => Metadata::Method(MethodMetadata {
inputs: self.convert_params(meta.inputs),
return_type: self.convert_optional(meta.return_type),
throws: self.convert_optional(meta.throws),
..meta
}),
Metadata::TraitMethod(meta) => Metadata::TraitMethod(TraitMethodMetadata {
inputs: self.convert_params(meta.inputs),
return_type: self.convert_optional(meta.return_type),
throws: self.convert_optional(meta.throws),
..meta
}),
Metadata::Constructor(meta) => Metadata::Constructor(ConstructorMetadata {
inputs: self.convert_params(meta.inputs),
throws: self.convert_optional(meta.throws),
..meta
}),
Metadata::Record(meta) => Metadata::Record(RecordMetadata {
fields: self.convert_fields(meta.fields),
..meta
}),
Metadata::Enum(meta) => Metadata::Enum(self.convert_enum(meta)),
_ => item,
}
}
fn convert_params(&self, params: Vec<FnParamMetadata>) -> Vec<FnParamMetadata> {
params
.into_iter()
.map(|param| FnParamMetadata {
ty: self.convert_type(param.ty),
..param
})
.collect()
}
fn convert_fields(&self, fields: Vec<FieldMetadata>) -> Vec<FieldMetadata> {
fields
.into_iter()
.map(|field| FieldMetadata {
ty: self.convert_type(field.ty),
..field
})
.collect()
}
fn convert_enum(&self, enum_: EnumMetadata) -> EnumMetadata {
EnumMetadata {
variants: enum_
.variants
.into_iter()
.map(|variant| VariantMetadata {
fields: self.convert_fields(variant.fields),
..variant
})
.collect(),
..enum_
}
}
fn convert_optional(&self, ty: Option<Type>) -> Option<Type> {
ty.map(|ty| self.convert_type(ty))
}
fn convert_type(&self, ty: Type) -> Type {
match ty {
// Convert `ty` if it's external
Type::Enum { module_path, name } | Type::Record { module_path, name }
if self.is_module_path_external(&module_path) =>
{
Type::External {
namespace: self.crate_to_namespace(&module_path),
module_path,
name,
kind: ExternalKind::DataClass,
tagged: false,
}
}
Type::Custom {
module_path, name, ..
} if self.is_module_path_external(&module_path) => {
// For now, it's safe to assume that all custom types are data classes.
// There's no reason to use a custom type with an interface.
Type::External {
namespace: self.crate_to_namespace(&module_path),
module_path,
name,
kind: ExternalKind::DataClass,
tagged: false,
}
}
Type::Object {
module_path, name, ..
} if self.is_module_path_external(&module_path) => Type::External {
namespace: self.crate_to_namespace(&module_path),
module_path,
name,
kind: ExternalKind::Interface,
tagged: false,
},
Type::CallbackInterface { module_path, name }
if self.is_module_path_external(&module_path) =>
{
panic!("External callback interfaces not supported ({name})")
}
// Convert child types
Type::Custom {
module_path,
name,
builtin,
..
} => Type::Custom {
module_path,
name,
builtin: Box::new(self.convert_type(*builtin)),
},
Type::Optional { inner_type } => Type::Optional {
inner_type: Box::new(self.convert_type(*inner_type)),
},
Type::Sequence { inner_type } => Type::Sequence {
inner_type: Box::new(self.convert_type(*inner_type)),
},
Type::Map {
key_type,
value_type,
} => Type::Map {
key_type: Box::new(self.convert_type(*key_type)),
value_type: Box::new(self.convert_type(*value_type)),
},
// Existing External types probably need namespace fixed.
Type::External {
namespace,
module_path,
name,
kind,
tagged,
} => {
assert!(namespace.is_empty());
Type::External {
namespace: self.crate_to_namespace(&module_path),
module_path,
name,
kind,
tagged,
}
}
// Otherwise, just return the type unchanged
_ => ty,
}
}
fn is_module_path_external(&self, module_path: &str) -> bool {
calc_crate_name(module_path) != self.crate_name
}
}
fn calc_crate_name(module_path: &str) -> &str {
module_path.split("::").next().unwrap()
}
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