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/// Lookup hir elements using position 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, Cancelable};
use ra_syntax::{
SmolStr, TextRange, SyntaxNode,
ast::{self, AstNode, NameOwner},
algo::find_node_at_offset,
};
use crate::{
HirDatabase, Function, SourceItemId,
DefKind, DefLoc, AsName, Module,
};
/// Locates the module by `FileId`. Picks topmost module in the file.
pub fn module_from_file_id(db: &impl HirDatabase, file_id: FileId) -> Cancelable<Option<Module>> {
let module_source = SourceItemId {
file_id: file_id.into(),
item_id: None,
};
module_from_source(db, module_source)
}
/// Locates the child module by `mod child;` declaration.
pub fn module_from_declaration(
db: &impl HirDatabase,
file_id: FileId,
decl: &ast::Module,
) -> Cancelable<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)) => {
if let Some(child) = parent_module.child(db, &child_name.as_name())? {
return Ok(Some(child));
}
}
_ => (),
}
Ok(None)
}
/// Locates the module by position in the source code.
pub fn module_from_position(
db: &impl HirDatabase,
position: FilePosition,
) -> Cancelable<Option<Module>> {
let file = db.source_file(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,
) -> Cancelable<Option<Module>> {
assert!(!module.has_semi());
let file_id = file_id.into();
let file_items = db.file_items(file_id);
let item_id = file_items.id_of(file_id, module.syntax());
let source = SourceItemId {
file_id,
item_id: Some(item_id),
};
module_from_source(db, source)
}
/// Locates the module by child syntax element within the module
pub fn module_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
child: &SyntaxNode,
) -> Cancelable<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, source: SourceItemId) -> Cancelable<Option<Module>> {
let source_root_id = db.file_source_root(source.file_id.as_original_file());
let module_tree = db.module_tree(source_root_id)?;
let module_id = ctry!(module_tree.find_module_by_source(source));
Ok(Some(Module::from_module_id(db, source_root_id, module_id)?))
}
pub fn function_from_position(
db: &impl HirDatabase,
position: FilePosition,
) -> Cancelable<Option<Function>> {
let file = db.source_file(position.file_id);
let fn_def = ctry!(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,
) -> Cancelable<Option<Function>> {
let module = ctry!(module_from_child_node(db, file_id, fn_def.syntax())?);
let res = function_from_module(db, &module, fn_def);
Ok(Some(res))
}
pub fn function_from_module(
db: &impl HirDatabase,
module: &Module,
fn_def: &ast::FnDef,
) -> Function {
let loc = module.def_id.loc(db);
let file_id = loc.source_item_id.file_id;
let file_items = db.file_items(file_id);
let item_id = file_items.id_of(file_id, fn_def.syntax());
let source_item_id = SourceItemId {
file_id,
item_id: Some(item_id),
};
let def_loc = DefLoc {
kind: DefKind::Function,
source_root_id: loc.source_root_id,
module_id: loc.module_id,
source_item_id,
};
Function::new(def_loc.id(db))
}
pub fn function_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
node: &SyntaxNode,
) -> Cancelable<Option<Function>> {
let fn_def = ctry!(node.ancestors().find_map(ast::FnDef::cast));
function_from_source(db, file_id, fn_def)
}
pub fn macro_symbols(
db: &impl HirDatabase,
file_id: FileId,
) -> Cancelable<Vec<(SmolStr, TextRange)>> {
let module = match module_from_file_id(db, file_id)? {
Some(it) => it,
None => return Ok(Vec::new()),
};
let loc = module.def_id.loc(db);
let items = db.input_module_items(loc.source_root_id, loc.module_id)?;
let mut res = Vec::new();
for macro_call_id in items
.items
.iter()
.filter_map(|it| it.id.file_id.as_macro_call_id())
{
if let Some(exp) = db.expand_macro_invocation(macro_call_id) {
let loc = macro_call_id.loc(db);
let syntax = db.file_item(loc.source_item_id);
let macro_call = ast::MacroCall::cast(&syntax).unwrap();
let off = macro_call.token_tree().unwrap().syntax().range().start();
let file = exp.file();
for trait_def in file.syntax().descendants().filter_map(ast::TraitDef::cast) {
if let Some(name) = trait_def.name() {
let dst_range = name.syntax().range();
if let Some(src_range) = exp.map_range_back(dst_range) {
res.push((name.text().clone(), src_range + off))
}
}
}
}
}
Ok(res)
}
|
