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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_syntax::{
ast::{self, NameOwner, StructFlavor}
};
use crate::{
Name, AsName, Struct, Enum, EnumVariant, Module, HirFileId,
HirDatabase,
type_ref::TypeRef,
ids::ItemLoc,
};
impl Struct {
pub(crate) fn from_ast(
db: &impl HirDatabase,
module: Module,
file_id: HirFileId,
ast: &ast::StructDef,
) -> Struct {
let loc = ItemLoc::from_ast(db, module, file_id, ast);
let id = db.as_ref().structs.loc2id(&loc);
Struct { id }
}
pub(crate) fn variant_data(&self, db: &impl HirDatabase) -> Arc<VariantData> {
db.struct_data((*self).into()).variant_data.clone()
}
}
impl Enum {
pub(crate) fn from_ast(
db: &impl HirDatabase,
module: Module,
file_id: HirFileId,
ast: &ast::EnumDef,
) -> Enum {
let loc = ItemLoc::from_ast(db, module, file_id, ast);
let id = db.as_ref().enums.loc2id(&loc);
Enum { id }
}
}
#[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))
}
}
impl EnumVariant {
pub(crate) fn from_ast(
db: &impl HirDatabase,
module: Module,
file_id: HirFileId,
ast: &ast::EnumVariant,
) -> EnumVariant {
let loc = ItemLoc::from_ast(db, module, file_id, ast);
let id = db.as_ref().enum_variants.loc2id(&loc);
EnumVariant { id }
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumData {
pub(crate) name: Option<Name>,
pub(crate) variants: Vec<(Name, EnumVariant)>,
}
impl EnumData {
fn new(enum_def: &ast::EnumDef, variants: Vec<(Name, EnumVariant)>) -> Self {
let name = enum_def.name().map(|n| n.as_name());
EnumData { name, variants }
}
pub(crate) fn enum_data_query(db: &impl HirDatabase, e: Enum) -> Arc<EnumData> {
let (file_id, enum_def) = e.source(db);
let module = e.module(db);
let variants = if let Some(vl) = enum_def.variant_list() {
vl.variants()
.filter_map(|variant_def| {
let name = variant_def.name().map(|n| n.as_name());
name.map(|n| (n, EnumVariant::from_ast(db, module, file_id, variant_def)))
})
.collect()
} else {
Vec::new()
};
Arc::new(EnumData::new(&*enum_def, variants))
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumVariantData {
pub(crate) name: Option<Name>,
pub(crate) variant_data: Arc<VariantData>,
pub(crate) parent_enum: Enum,
}
impl EnumVariantData {
fn new(variant_def: &ast::EnumVariant, parent_enum: Enum) -> EnumVariantData {
let name = variant_def.name().map(|n| n.as_name());
let variant_data = VariantData::new(variant_def.flavor());
let variant_data = Arc::new(variant_data);
EnumVariantData {
name,
variant_data,
parent_enum,
}
}
pub(crate) fn enum_variant_data_query(
db: &impl HirDatabase,
var: EnumVariant,
) -> Arc<EnumVariantData> {
let (file_id, variant_def) = var.source(db);
let enum_def = variant_def.parent_enum();
let e = Enum::from_ast(db, var.module(db), file_id, enum_def);
Arc::new(EnumVariantData::new(&*variant_def, e))
}
}
/// A single field of an enum variant or struct
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct StructField {
pub(crate) name: Name,
pub(crate) type_ref: TypeRef,
}
/// Fields of an enum variant or struct
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum VariantData {
Struct(Vec<StructField>),
Tuple(Vec<StructField>),
Unit,
}
impl VariantData {
pub fn fields(&self) -> &[StructField] {
match self {
VariantData::Struct(fields) | VariantData::Tuple(fields) => fields,
_ => &[],
}
}
pub fn is_struct(&self) -> bool {
match self {
VariantData::Struct(..) => true,
_ => false,
}
}
pub fn is_tuple(&self) -> bool {
match self {
VariantData::Tuple(..) => true,
_ => false,
}
}
pub fn is_unit(&self) -> bool {
match self {
VariantData::Unit => true,
_ => false,
}
}
}
impl VariantData {
fn new(flavor: StructFlavor) -> Self {
match flavor {
StructFlavor::Tuple(fl) => {
let fields = fl
.fields()
.enumerate()
.map(|(i, fd)| StructField {
name: Name::tuple_field_name(i),
type_ref: TypeRef::from_ast_opt(fd.type_ref()),
})
.collect();
VariantData::Tuple(fields)
}
StructFlavor::Named(fl) => {
let fields = fl
.fields()
.map(|fd| StructField {
name: fd.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
type_ref: TypeRef::from_ast_opt(fd.type_ref()),
})
.collect();
VariantData::Struct(fields)
}
StructFlavor::Unit => VariantData::Unit,
}
}
pub(crate) fn get_field_type_ref(&self, field_name: &Name) -> Option<&TypeRef> {
self.fields()
.iter()
.find(|f| f.name == *field_name)
.map(|f| &f.type_ref)
}
}
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