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//! FIXME: write short doc here
use hir_expand::name::AsName;
use ra_syntax::ast::{self, AstNode, NameOwner};
use crate::{
db::{AstDatabase, DefDatabase, HirDatabase},
ids::{AstItemDef, LocationCtx},
AstId, Const, Crate, Enum, EnumVariant, FieldSource, Function, HasSource, ImplBlock, Module,
ModuleSource, Source, Static, Struct, StructField, Trait, TypeAlias, Union, VariantDef,
};
pub trait FromSource: Sized {
type Ast;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self>;
}
impl FromSource for Struct {
type Ast = ast::StructDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Struct { id })
}
}
impl FromSource for Union {
type Ast = ast::StructDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Union { id })
}
}
impl FromSource for Enum {
type Ast = ast::EnumDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Enum { id })
}
}
impl FromSource for Trait {
type Ast = ast::TraitDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Trait { id })
}
}
impl FromSource for Function {
type Ast = ast::FnDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Function { id })
}
}
impl FromSource for Const {
type Ast = ast::ConstDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Const { id })
}
}
impl FromSource for Static {
type Ast = ast::StaticDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(Static { id })
}
}
impl FromSource for TypeAlias {
type Ast = ast::TypeAliasDef;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let id = from_source(db, src)?;
Some(TypeAlias { id })
}
}
// FIXME: add impl FromSource for MacroDef
impl FromSource for ImplBlock {
type Ast = ast::ImplBlock;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let module_src = crate::ModuleSource::from_child_node(
db,
src.file_id.original_file(db),
&src.ast.syntax(),
);
let module = Module::from_definition(db, Source { file_id: src.file_id, ast: module_src })?;
let impls = module.impl_blocks(db);
impls.into_iter().find(|b| b.source(db) == src)
}
}
impl FromSource for EnumVariant {
type Ast = ast::EnumVariant;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let parent_enum = src.ast.parent_enum();
let src_enum = Source { file_id: src.file_id, ast: parent_enum };
let variants = Enum::from_source(db, src_enum)?.variants(db);
variants.into_iter().find(|v| v.source(db) == src)
}
}
impl FromSource for StructField {
type Ast = FieldSource;
fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
let variant_def: VariantDef = match src.ast {
FieldSource::Named(ref field) => {
let ast = field.syntax().ancestors().find_map(ast::StructDef::cast)?;
let src = Source { file_id: src.file_id, ast };
let def = Struct::from_source(db, src)?;
VariantDef::from(def)
}
FieldSource::Pos(ref field) => {
let ast = field.syntax().ancestors().find_map(ast::EnumVariant::cast)?;
let src = Source { file_id: src.file_id, ast };
let def = EnumVariant::from_source(db, src)?;
VariantDef::from(def)
}
};
variant_def
.variant_data(db)
.fields()
.into_iter()
.flat_map(|it| it.iter())
.map(|(id, _)| StructField { parent: variant_def, id })
.find(|f| f.source(db) == src)
}
}
impl Module {
pub fn from_declaration(db: &impl HirDatabase, src: Source<ast::Module>) -> Option<Self> {
let src_parent = Source {
file_id: src.file_id,
ast: ModuleSource::new(db, Some(src.file_id.original_file(db)), None),
};
let parent_module = Module::from_definition(db, src_parent)?;
let child_name = src.ast.name()?;
parent_module.child(db, &child_name.as_name())
}
pub fn from_definition(
db: &(impl DefDatabase + AstDatabase),
src: Source<ModuleSource>,
) -> Option<Self> {
let decl_id = match src.ast {
ModuleSource::Module(ref module) => {
assert!(!module.has_semi());
let ast_id_map = db.ast_id_map(src.file_id);
let item_id = AstId::new(src.file_id, ast_id_map.ast_id(module));
Some(item_id)
}
ModuleSource::SourceFile(_) => None,
};
db.relevant_crates(src.file_id.original_file(db)).iter().find_map(|&crate_id| {
let def_map = db.crate_def_map(crate_id);
let (module_id, _module_data) =
def_map.modules.iter().find(|(_module_id, module_data)| {
if decl_id.is_some() {
module_data.declaration == decl_id
} else {
module_data.definition.map(|it| it.into()) == Some(src.file_id)
}
})?;
Some(Module::new(Crate { crate_id }, module_id))
})
}
}
fn from_source<N, DEF>(db: &(impl DefDatabase + AstDatabase), src: Source<N>) -> Option<DEF>
where
N: AstNode,
DEF: AstItemDef<N>,
{
let module_src =
crate::ModuleSource::from_child_node(db, src.file_id.original_file(db), &src.ast.syntax());
let module = Module::from_definition(db, Source { file_id: src.file_id, ast: module_src })?;
let ctx = LocationCtx::new(db, module.id, src.file_id);
Some(DEF::from_ast(ctx, &src.ast))
}
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