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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_editor::find_node_at_offset;
use ra_syntax::{
ast::{self, AstNode},
SyntaxNodeRef,
};
use crate::{
HirDatabase, Module, Function, SourceItemId,
module::ModuleSource,
DefKind, DefLoc
};
/// 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 = ModuleSource::new_file(db, file_id);
module_from_source(db, module_source)
}
/// 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);
let module_source = match find_node_at_offset::<ast::Module>(file.syntax(), position.offset) {
Some(m) if !m.has_semi() => ModuleSource::new_inline(db, position.file_id, m),
_ => ModuleSource::new_file(db, position.file_id),
};
module_from_source(db, module_source)
}
/// Locates the module by child syntax element within the module
pub fn module_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
child: SyntaxNodeRef,
) -> Cancelable<Option<Module>> {
let module_source = if let Some(m) = child
.ancestors()
.filter_map(ast::Module::cast)
.find(|it| !it.has_semi())
{
ModuleSource::new_inline(db, file_id, m)
} else {
ModuleSource::new_file(db, file_id)
};
module_from_source(db, module_source)
}
fn module_from_source(
db: &impl HirDatabase,
module_source: ModuleSource,
) -> Cancelable<Option<Module>> {
let source_root_id = db.file_source_root(module_source.file_id());
let module_tree = db.module_tree(source_root_id)?;
let m = module_tree
.modules_with_sources()
.find(|(_id, src)| src == &module_source);
let module_id = ctry!(m).0;
Ok(Some(Module::new(db, source_root_id, module_id)?))
}
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 file_items = db.file_items(file_id);
let item_id = file_items.id_of(fn_def.syntax());
let source_item_id = SourceItemId { file_id, item_id };
let def_loc = DefLoc {
kind: DefKind::Function,
source_root_id: module.source_root_id,
module_id: module.module_id,
source_item_id,
};
Ok(Some(Function::new(def_loc.id(db))))
}
pub fn function_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
node: SyntaxNodeRef,
) -> Cancelable<Option<Function>> {
let fn_def = ctry!(node.ancestors().find_map(ast::FnDef::cast));
function_from_source(db, file_id, fn_def)
}
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