2019-01-12 14:27:35 -06:00
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//! This module contains the implementation details of the HIR for ADTs, i.e.
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//! structs and enums (and unions).
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2018-12-24 14:00:14 -06:00
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use std::sync::Arc;
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use ra_arena::{RawId, Arena, impl_arena_id};
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use ra_syntax::{
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TreeArc,
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ast::{self, NameOwner, StructFlavor}
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};
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2018-12-24 12:07:48 -06:00
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use crate::{
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Name, AsName, Struct, Enum, EnumVariant, Crate,
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HirDatabase, HirFileId, StructField, FieldSource,
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type_ref::TypeRef, PersistentHirDatabase,
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};
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2019-01-24 16:53:07 -06:00
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
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pub enum AdtDef {
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Struct(Struct),
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Enum(Enum),
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}
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impl_froms!(AdtDef: Struct, Enum);
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impl AdtDef {
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pub(crate) fn krate(self, db: &impl HirDatabase) -> Option<Crate> {
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match self {
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AdtDef::Struct(s) => s.module(db),
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AdtDef::Enum(e) => e.module(db),
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}
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.krate(db)
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}
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}
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impl Struct {
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pub(crate) fn variant_data(&self, db: &impl PersistentHirDatabase) -> Arc<VariantData> {
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db.struct_data((*self).into()).variant_data.clone()
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}
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct StructData {
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pub(crate) name: Option<Name>,
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pub(crate) variant_data: Arc<VariantData>,
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}
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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());
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let variant_data = VariantData::new(struct_def.flavor());
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let variant_data = Arc::new(variant_data);
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StructData { name, variant_data }
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}
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pub(crate) fn struct_data_query(
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db: &impl PersistentHirDatabase,
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struct_: Struct,
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) -> Arc<StructData> {
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let (_, struct_def) = struct_.source(db);
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Arc::new(StructData::new(&*struct_def))
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}
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}
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fn variants(enum_def: &ast::EnumDef) -> impl Iterator<Item = &ast::EnumVariant> {
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enum_def.variant_list().into_iter().flat_map(|it| it.variants())
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}
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impl EnumVariant {
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pub(crate) fn source_impl(
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&self,
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db: &impl PersistentHirDatabase,
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) -> (HirFileId, TreeArc<ast::EnumVariant>) {
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let (file_id, enum_def) = self.parent.source(db);
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let var = variants(&*enum_def)
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.zip(db.enum_data(self.parent).variants.iter())
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.find(|(_syntax, (id, _))| *id == self.id)
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.unwrap()
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.0
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.to_owned();
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(file_id, var)
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}
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pub(crate) fn variant_data(&self, db: &impl PersistentHirDatabase) -> Arc<VariantData> {
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db.enum_data(self.parent).variants[self.id].variant_data.clone()
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}
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct EnumData {
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pub(crate) name: Option<Name>,
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pub(crate) variants: Arena<EnumVariantId, EnumVariantData>,
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}
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impl EnumData {
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pub(crate) fn enum_data_query(db: &impl PersistentHirDatabase, 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());
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let variants = variants(&*enum_def)
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.map(|var| EnumVariantData {
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name: var.name().map(|it| it.as_name()),
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variant_data: Arc::new(VariantData::new(var.flavor())),
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})
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.collect();
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Arc::new(EnumData { name, variants })
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}
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub(crate) struct EnumVariantId(RawId);
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impl_arena_id!(EnumVariantId);
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub(crate) struct EnumVariantData {
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pub(crate) name: Option<Name>,
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variant_data: Arc<VariantData>,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub(crate) struct StructFieldId(RawId);
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impl_arena_id!(StructFieldId);
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/// A single field of an enum variant or struct
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct StructFieldData {
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pub(crate) name: Name,
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pub(crate) type_ref: TypeRef,
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}
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/// Fields of an enum variant or struct
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub(crate) struct VariantData(VariantDataInner);
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#[derive(Debug, Clone, PartialEq, Eq)]
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enum VariantDataInner {
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Struct(Arena<StructFieldId, StructFieldData>),
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Tuple(Arena<StructFieldId, StructFieldData>),
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Unit,
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}
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impl VariantData {
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pub(crate) fn fields(&self) -> Option<&Arena<StructFieldId, StructFieldData>> {
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match &self.0 {
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VariantDataInner::Struct(fields) | VariantDataInner::Tuple(fields) => Some(fields),
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_ => None,
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}
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}
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}
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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) => {
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let fields = fl
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.fields()
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.enumerate()
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.map(|(i, fd)| StructFieldData {
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name: Name::tuple_field_name(i),
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type_ref: TypeRef::from_ast_opt(fd.type_ref()),
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})
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.collect();
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VariantDataInner::Tuple(fields)
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}
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ast::StructFlavor::Named(fl) => {
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let fields = fl
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.fields()
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.map(|fd| StructFieldData {
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name: fd.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
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type_ref: TypeRef::from_ast_opt(fd.type_ref()),
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})
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.collect();
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VariantDataInner::Struct(fields)
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}
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ast::StructFlavor::Unit => VariantDataInner::Unit,
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};
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VariantData(inner)
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}
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}
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
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pub enum VariantDef {
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Struct(Struct),
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EnumVariant(EnumVariant),
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}
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impl_froms!(VariantDef: Struct, EnumVariant);
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impl VariantDef {
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pub(crate) fn field(self, db: &impl HirDatabase, name: &Name) -> Option<StructField> {
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match self {
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VariantDef::Struct(it) => it.field(db, name),
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VariantDef::EnumVariant(it) => it.field(db, name),
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}
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}
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pub(crate) fn variant_data(self, db: &impl PersistentHirDatabase) -> Arc<VariantData> {
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match self {
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VariantDef::Struct(it) => it.variant_data(db),
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VariantDef::EnumVariant(it) => it.variant_data(db),
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}
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}
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}
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impl StructField {
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pub(crate) fn source_impl(&self, db: &impl PersistentHirDatabase) -> (HirFileId, FieldSource) {
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let var_data = self.parent.variant_data(db);
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let fields = var_data.fields().unwrap();
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let ss;
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let es;
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let (file_id, struct_flavor) = match self.parent {
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VariantDef::Struct(s) => {
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let (file_id, source) = s.source(db);
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ss = source;
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(file_id, ss.flavor())
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}
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VariantDef::EnumVariant(e) => {
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let (file_id, source) = e.source(db);
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es = source;
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(file_id, es.flavor())
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}
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};
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let field_sources = match struct_flavor {
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ast::StructFlavor::Tuple(fl) => {
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fl.fields().map(|it| FieldSource::Pos(it.to_owned())).collect()
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}
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ast::StructFlavor::Named(fl) => {
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fl.fields().map(|it| FieldSource::Named(it.to_owned())).collect()
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}
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ast::StructFlavor::Unit => Vec::new(),
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};
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let field = field_sources
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.into_iter()
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.zip(fields.iter())
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.find(|(_syntax, (id, _))| *id == self.id)
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.unwrap()
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.0;
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(file_id, field)
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}
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}
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