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//! This module contains the implementation details of the HIR for ADTs, i.e.
//! structs and enums (and unions).
use std::sync::Arc;
use ra_arena::{RawId, Arena, impl_arena_id};
use ra_syntax::{
TreeArc,
ast::{self, NameOwner, StructFlavor}
};
use crate::{
Name, AsName, Struct, Enum, EnumVariant, Crate,
HirDatabase, HirFileId,
type_ref::TypeRef,
};
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum AdtDef {
Struct(Struct),
Enum(Enum),
}
impl_froms!(AdtDef: Struct, Enum);
impl AdtDef {
pub(crate) fn krate(self, db: &impl HirDatabase) -> Option<Crate> {
match self {
AdtDef::Struct(s) => s.module(db),
AdtDef::Enum(e) => e.module(db),
}
.krate(db)
}
}
impl Struct {
pub(crate) fn variant_data(&self, db: &impl HirDatabase) -> Arc<VariantData> {
db.struct_data((*self).into()).variant_data.clone()
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct StructData {
pub(crate) name: Option<Name>,
pub(crate) variant_data: Arc<VariantData>,
}
impl StructData {
fn new(struct_def: &ast::StructDef) -> StructData {
let name = struct_def.name().map(|n| n.as_name());
let variant_data = VariantData::new(struct_def.flavor());
let variant_data = Arc::new(variant_data);
StructData { name, variant_data }
}
pub(crate) fn struct_data_query(db: &impl HirDatabase, struct_: Struct) -> Arc<StructData> {
let (_, struct_def) = struct_.source(db);
Arc::new(StructData::new(&*struct_def))
}
}
fn variants(enum_def: &ast::EnumDef) -> impl Iterator<Item = &ast::EnumVariant> {
enum_def
.variant_list()
.into_iter()
.flat_map(|it| it.variants())
}
impl EnumVariant {
pub(crate) fn source_impl(
&self,
db: &impl HirDatabase,
) -> (HirFileId, TreeArc<ast::EnumVariant>) {
let (file_id, enum_def) = self.parent.source(db);
let var = variants(&*enum_def)
.zip(db.enum_data(self.parent).variants.iter())
.find(|(_syntax, (id, _))| *id == self.id)
.unwrap()
.0
.to_owned();
(file_id, var)
}
pub(crate) fn variant_data(&self, db: &impl HirDatabase) -> Arc<VariantData> {
db.enum_data(self.parent).variants[self.id]
.variant_data
.clone()
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumData {
pub(crate) name: Option<Name>,
pub(crate) variants: Arena<EnumVariantId, EnumVariantData>,
}
impl EnumData {
pub(crate) fn enum_data_query(db: &impl HirDatabase, e: Enum) -> Arc<EnumData> {
let (_file_id, enum_def) = e.source(db);
let name = enum_def.name().map(|n| n.as_name());
let variants = variants(&*enum_def)
.map(|var| EnumVariantData {
name: var.name().map(|it| it.as_name()),
variant_data: Arc::new(VariantData::new(var.flavor())),
})
.collect();
Arc::new(EnumData { name, variants })
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct EnumVariantId(RawId);
impl_arena_id!(EnumVariantId);
#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) struct EnumVariantData {
pub(crate) name: Option<Name>,
variant_data: Arc<VariantData>,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct StructFieldId(RawId);
impl_arena_id!(StructFieldId);
/// A single field of an enum variant or struct
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct StructFieldData {
pub(crate) name: Name,
pub(crate) type_ref: TypeRef,
}
/// Fields of an enum variant or struct
#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) struct VariantData(VariantDataInner);
#[derive(Debug, Clone, PartialEq, Eq)]
enum VariantDataInner {
Struct(Arena<StructFieldId, StructFieldData>),
Tuple(Arena<StructFieldId, StructFieldData>),
Unit,
}
impl VariantData {
pub(crate) fn fields(&self) -> Option<&Arena<StructFieldId, StructFieldData>> {
match &self.0 {
VariantDataInner::Struct(fields) | VariantDataInner::Tuple(fields) => Some(fields),
_ => None,
}
}
}
impl VariantData {
fn new(flavor: StructFlavor) -> Self {
let inner = match flavor {
StructFlavor::Tuple(fl) => {
let fields = fl
.fields()
.enumerate()
.map(|(i, fd)| StructFieldData {
name: Name::tuple_field_name(i),
type_ref: TypeRef::from_ast_opt(fd.type_ref()),
})
.collect();
VariantDataInner::Tuple(fields)
}
StructFlavor::Named(fl) => {
let fields = fl
.fields()
.map(|fd| StructFieldData {
name: fd.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
type_ref: TypeRef::from_ast_opt(fd.type_ref()),
})
.collect();
VariantDataInner::Struct(fields)
}
StructFlavor::Unit => VariantDataInner::Unit,
};
VariantData(inner)
}
}
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