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/// Lookup hir elements using positions in the source code. This is a lossy
/// transformation: in general, a single source might correspond to several
/// modules, functions, etc, due to macros, cfgs and `#[path=]` attributes on
/// modules.
///
/// So, this modules should not be used during hir construction, it exists
/// purely for "IDE needs".
use ra_db::{FileId, FilePosition};
use ra_syntax::{
SyntaxNode,
ast::{self, AstNode, NameOwner},
algo::{find_node_at_offset, find_token_at_offset},
};
use crate::{
HirDatabase, Function, Struct, Enum,
AsName, Module, HirFileId, Crate, Trait, Resolver,
ids::LocationCtx,
expr, AstId
};
/// Locates the module by `FileId`. Picks topmost module in the file.
pub fn module_from_file_id(db: &impl HirDatabase, file_id: FileId) -> Option<Module> {
module_from_source(db, file_id.into(), None)
}
/// Locates the child module by `mod child;` declaration.
pub fn module_from_declaration(
db: &impl HirDatabase,
file_id: FileId,
decl: &ast::Module,
) -> Option<Module> {
let parent_module = module_from_file_id(db, file_id);
let child_name = decl.name();
match (parent_module, child_name) {
(Some(parent_module), Some(child_name)) => parent_module.child(db, &child_name.as_name()),
_ => None,
}
}
/// Locates the module by position in the source code.
pub fn module_from_position(db: &impl HirDatabase, position: FilePosition) -> Option<Module> {
let file = db.parse(position.file_id);
match find_node_at_offset::<ast::Module>(file.syntax(), position.offset) {
Some(m) if !m.has_semi() => module_from_inline(db, position.file_id.into(), m),
_ => module_from_file_id(db, position.file_id.into()),
}
}
fn module_from_inline(
db: &impl HirDatabase,
file_id: FileId,
module: &ast::Module,
) -> Option<Module> {
assert!(!module.has_semi());
let file_id = file_id.into();
let ast_id_map = db.ast_id_map(file_id);
let item_id = ast_id_map.ast_id(module).with_file_id(file_id);
module_from_source(db, file_id, Some(item_id))
}
/// Locates the module by child syntax element within the module
pub fn module_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
child: &SyntaxNode,
) -> Option<Module> {
if let Some(m) = child.ancestors().filter_map(ast::Module::cast).find(|it| !it.has_semi()) {
module_from_inline(db, file_id.into(), m)
} else {
module_from_file_id(db, file_id.into())
}
}
fn module_from_source(
db: &impl HirDatabase,
file_id: HirFileId,
decl_id: Option<AstId<ast::Module>>,
) -> Option<Module> {
let source_root_id = db.file_source_root(file_id.as_original_file());
db.source_root_crates(source_root_id).iter().map(|&crate_id| Crate { crate_id }).find_map(
|krate| {
let def_map = db.crate_def_map(krate);
let module_id = def_map.find_module_by_source(file_id, decl_id)?;
Some(Module { krate, module_id })
},
)
}
pub fn function_from_position(db: &impl HirDatabase, position: FilePosition) -> Option<Function> {
let file = db.parse(position.file_id);
let fn_def = find_node_at_offset::<ast::FnDef>(file.syntax(), position.offset)?;
function_from_source(db, position.file_id, fn_def)
}
pub fn function_from_source(
db: &impl HirDatabase,
file_id: FileId,
fn_def: &ast::FnDef,
) -> Option<Function> {
let module = module_from_child_node(db, file_id, fn_def.syntax())?;
let res = function_from_module(db, module, fn_def);
Some(res)
}
pub fn function_from_module(
db: &impl HirDatabase,
module: Module,
fn_def: &ast::FnDef,
) -> Function {
let (file_id, _) = module.definition_source(db);
let file_id = file_id.into();
let ctx = LocationCtx::new(db, module, file_id);
Function { id: ctx.to_def(fn_def) }
}
pub fn function_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
node: &SyntaxNode,
) -> Option<Function> {
let fn_def = node.ancestors().find_map(ast::FnDef::cast)?;
function_from_source(db, file_id, fn_def)
}
pub fn struct_from_module(
db: &impl HirDatabase,
module: Module,
struct_def: &ast::StructDef,
) -> Struct {
let (file_id, _) = module.definition_source(db);
let file_id = file_id.into();
let ctx = LocationCtx::new(db, module, file_id);
Struct { id: ctx.to_def(struct_def) }
}
pub fn enum_from_module(db: &impl HirDatabase, module: Module, enum_def: &ast::EnumDef) -> Enum {
let (file_id, _) = module.definition_source(db);
let file_id = file_id.into();
let ctx = LocationCtx::new(db, module, file_id);
Enum { id: ctx.to_def(enum_def) }
}
pub fn trait_from_module(
db: &impl HirDatabase,
module: Module,
trait_def: &ast::TraitDef,
) -> Trait {
let (file_id, _) = module.definition_source(db);
let file_id = file_id.into();
let ctx = LocationCtx::new(db, module, file_id);
Trait { id: ctx.to_def(trait_def) }
}
pub fn resolver_for_position(db: &impl HirDatabase, position: FilePosition) -> Resolver {
let file_id = position.file_id;
let file = db.parse(file_id);
find_token_at_offset(file.syntax(), position.offset)
.find_map(|token| {
token.parent().ancestors().find_map(|node| {
if ast::Expr::cast(node).is_some() || ast::Block::cast(node).is_some() {
if let Some(func) = function_from_child_node(db, file_id, node) {
let scopes = func.scopes(db);
let scope = scopes.scope_for_offset(position.offset);
Some(expr::resolver_for_scope(func.body(db), db, scope))
} else {
// FIXME const/static/array length
None
}
} else {
try_get_resolver_for_node(db, file_id, node)
}
})
})
.unwrap_or_default()
}
pub fn resolver_for_node(db: &impl HirDatabase, file_id: FileId, node: &SyntaxNode) -> Resolver {
node.ancestors()
.find_map(|node| {
if ast::Expr::cast(node).is_some() || ast::Block::cast(node).is_some() {
if let Some(func) = function_from_child_node(db, file_id, node) {
let scopes = func.scopes(db);
let scope = scopes.scope_for(&node);
Some(expr::resolver_for_scope(func.body(db), db, scope))
} else {
// FIXME const/static/array length
None
}
} else {
try_get_resolver_for_node(db, file_id, node)
}
})
.unwrap_or_default()
}
fn try_get_resolver_for_node(
db: &impl HirDatabase,
file_id: FileId,
node: &SyntaxNode,
) -> Option<Resolver> {
if let Some(module) = ast::Module::cast(node) {
Some(module_from_declaration(db, file_id, module)?.resolver(db))
} else if let Some(_) = ast::SourceFile::cast(node) {
Some(module_from_source(db, file_id.into(), None)?.resolver(db))
} else if let Some(s) = ast::StructDef::cast(node) {
let module = module_from_child_node(db, file_id, s.syntax())?;
Some(struct_from_module(db, module, s).resolver(db))
} else if let Some(e) = ast::EnumDef::cast(node) {
let module = module_from_child_node(db, file_id, e.syntax())?;
Some(enum_from_module(db, module, e).resolver(db))
} else if let Some(f) = ast::FnDef::cast(node) {
function_from_source(db, file_id, f).map(|f| f.resolver(db))
} else {
// FIXME add missing cases
None
}
}
|
