rust/crates/ra_hir/src/code_model/src.rs

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use ra_syntax::{
ast::{self, AstNode},
SyntaxNode,
};
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use crate::{
ids::AstItemDef, AstDatabase, Const, DefDatabase, Either, Enum, EnumVariant, FieldSource,
Function, HasBody, HirDatabase, HirFileId, MacroDef, Module, ModuleSource, Static, Struct,
StructField, Trait, TypeAlias, Union,
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};
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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pub struct Source<T> {
pub file_id: HirFileId,
pub ast: T,
}
pub trait HasSource {
type Ast;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<Self::Ast>;
}
impl<T> Source<T> {
pub(crate) fn map<F: FnOnce(T) -> U, U>(self, f: F) -> Source<U> {
Source { file_id: self.file_id, ast: f(self.ast) }
}
pub(crate) fn file_syntax(&self, db: &impl AstDatabase) -> SyntaxNode {
db.parse_or_expand(self.file_id).expect("source created from invalid file")
}
}
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/// NB: Module is !HasSource, because it has two source nodes at the same time:
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/// definition and declaration.
impl Module {
/// Returns a node which defines this module. That is, a file or a `mod foo {}` with items.
pub fn definition_source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ModuleSource> {
let def_map = db.crate_def_map(self.krate);
let decl_id = def_map[self.module_id].declaration;
let file_id = def_map[self.module_id].definition;
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let ast = ModuleSource::new(db, file_id, decl_id);
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let file_id = file_id.map(HirFileId::from).unwrap_or_else(|| decl_id.unwrap().file_id());
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Source { file_id, ast }
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}
/// Returns a node which declares this module, either a `mod foo;` or a `mod foo {}`.
/// `None` for the crate root.
pub fn declaration_source(
self,
db: &(impl DefDatabase + AstDatabase),
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) -> Option<Source<ast::Module>> {
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let def_map = db.crate_def_map(self.krate);
let decl = def_map[self.module_id].declaration?;
let ast = decl.to_node(db);
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Some(Source { file_id: decl.file_id(), ast })
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}
}
impl HasSource for StructField {
type Ast = FieldSource;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<FieldSource> {
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self.source_impl(db)
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}
}
impl HasSource for Struct {
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type Ast = ast::StructDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::StructDef> {
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self.id.source(db)
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}
}
impl HasSource for Union {
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type Ast = ast::StructDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::StructDef> {
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self.id.source(db)
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}
}
impl HasSource for Enum {
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type Ast = ast::EnumDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::EnumDef> {
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self.id.source(db)
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}
}
impl HasSource for EnumVariant {
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type Ast = ast::EnumVariant;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::EnumVariant> {
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self.source_impl(db)
}
}
impl HasSource for Function {
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type Ast = ast::FnDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::FnDef> {
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self.id.source(db)
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}
}
impl HasSource for Const {
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type Ast = ast::ConstDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::ConstDef> {
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self.id.source(db)
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}
}
impl HasSource for Static {
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type Ast = ast::StaticDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::StaticDef> {
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self.id.source(db)
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}
}
impl HasSource for Trait {
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type Ast = ast::TraitDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::TraitDef> {
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self.id.source(db)
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}
}
impl HasSource for TypeAlias {
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type Ast = ast::TypeAliasDef;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::TypeAliasDef> {
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self.id.source(db)
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}
}
impl HasSource for MacroDef {
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type Ast = ast::MacroCall;
fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::MacroCall> {
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Source { file_id: self.id.0.file_id(), ast: self.id.0.to_node(db) }
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}
}
pub trait HasBodySource: HasBody + HasSource
where
Self::Ast: AstNode,
{
fn expr_source(
self,
db: &impl HirDatabase,
expr_id: crate::expr::ExprId,
) -> Option<Source<Either<ast::Expr, ast::RecordField>>> {
let source_map = self.body_source_map(db);
let source_ptr = source_map.expr_syntax(expr_id)?;
let root = source_ptr.file_syntax(db);
let source = source_ptr.map(|ast| ast.map(|it| it.to_node(&root), |it| it.to_node(&root)));
Some(source)
}
}
impl<T> HasBodySource for T
where
T: HasBody + HasSource,
T::Ast: AstNode,
{
}