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use std::sync::Arc;
use ra_db::Cancelable;
use ra_syntax::ast::{self, NameOwner, StructFlavor, AstNode};
use crate::{
DefId, Name, AsName, Struct, Enum, HirDatabase, DefKind,
type_ref::TypeRef,
};
impl Struct {
pub(crate) fn new(def_id: DefId) -> Self {
Struct { def_id }
}
pub(crate) fn variant_data(&self, db: &impl HirDatabase) -> Cancelable<Arc<VariantData>> {
Ok(db.struct_data(self.def_id)?.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,
def_id: DefId,
) -> Cancelable<Arc<StructData>> {
let def_loc = def_id.loc(db);
assert!(def_loc.kind == DefKind::Struct);
let syntax = db.file_item(def_loc.source_item_id);
let struct_def =
ast::StructDef::cast(&syntax).expect("struct def should point to StructDef node");
Ok(Arc::new(StructData::new(struct_def)))
}
}
impl Enum {
pub(crate) fn new(def_id: DefId) -> Self {
Enum { def_id }
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct EnumData {
pub(crate) name: Option<Name>,
pub(crate) variants: Vec<(Name, Arc<VariantData>)>,
}
impl EnumData {
fn new(enum_def: &ast::EnumDef) -> Self {
let name = enum_def.name().map(|n| n.as_name());
let variants = if let Some(evl) = enum_def.variant_list() {
evl.variants()
.map(|v| {
(
v.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
Arc::new(VariantData::new(v.flavor())),
)
})
.collect()
} else {
Vec::new()
};
EnumData { name, variants }
}
pub(crate) fn enum_data_query(
db: &impl HirDatabase,
def_id: DefId,
) -> Cancelable<Arc<EnumData>> {
let def_loc = def_id.loc(db);
assert!(def_loc.kind == DefKind::Enum);
let syntax = db.file_item(def_loc.source_item_id);
let enum_def = ast::EnumDef::cast(&syntax).expect("enum def should point to EnumDef node");
Ok(Arc::new(EnumData::new(enum_def)))
}
}
/// 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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