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use ra_editor::{CompletionItem, find_node_at_offset, complete_module_items};
use ra_syntax::{
AtomEdit, File, TextUnit, AstNode,
ast::{self, ModuleItemOwner},
};
use crate::{
FileId, Cancelable,
db::{self, SyntaxDatabase},
descriptors::module::{ModulesDatabase, ModuleTree, ModuleId},
};
pub(crate) fn resolve_based_completion(db: &db::RootDatabase, file_id: FileId, offset: TextUnit) -> Cancelable<Option<Vec<CompletionItem>>> {
let file = db.file_syntax(file_id);
let module_tree = db.module_tree()?;
let file = {
let edit = AtomEdit::insert(offset, "intellijRulezz".to_string());
file.reparse(&edit)
};
let target_file = match find_target_module(&module_tree, file_id, &file, offset) {
None => return Ok(None),
Some(target_module) => {
let file_id = target_module.file_id(&module_tree);
db.file_syntax(file_id)
}
};
let mut res = Vec::new();
complete_module_items(target_file.ast().items(), None, &mut res);
Ok(Some(res))
}
pub(crate) fn find_target_module(module_tree: &ModuleTree, file_id: FileId, file: &File, offset: TextUnit) -> Option<ModuleId> {
let name_ref: ast::NameRef = find_node_at_offset(file.syntax(), offset)?;
let mut crate_path = crate_path(name_ref)?;
let module_id = module_tree.any_module_for_file(file_id)?;
crate_path.pop();
let mut target_module = module_id.root(&module_tree);
for name in crate_path {
target_module = target_module.child(module_tree, name.text().as_str())?;
}
Some(target_module)
}
fn crate_path(name_ref: ast::NameRef) -> Option<Vec<ast::NameRef>> {
let mut path = name_ref.syntax()
.parent().and_then(ast::PathSegment::cast)?
.parent_path();
let mut res = Vec::new();
loop {
let segment = path.segment()?;
match segment.kind()? {
ast::PathSegmentKind::Name(name) => res.push(name),
ast::PathSegmentKind::CrateKw => break,
ast::PathSegmentKind::SelfKw | ast::PathSegmentKind::SuperKw =>
return None,
}
path = path.qualifier()?;
}
res.reverse();
Some(res)
}
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