rust/crates/ra_hir/src/adt.rs

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