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|
mod completion_item;
mod complete_fn_param;
mod complete_keyword;
mod complete_snippet;
mod complete_path;
mod complete_scope;
use ra_editor::find_node_at_offset;
use ra_text_edit::AtomTextEdit;
use ra_syntax::{
algo::find_leaf_at_offset,
ast,
AstNode,
SyntaxNodeRef,
SourceFileNode,
TextUnit,
SyntaxKind::*,
};
use ra_db::SyntaxDatabase;
use hir::source_binder;
use crate::{
db,
Cancelable, FilePosition,
completion::completion_item::{Completions, CompletionKind},
};
pub use crate::completion::completion_item::{CompletionItem, InsertText};
pub(crate) fn completions(
db: &db::RootDatabase,
position: FilePosition,
) -> Cancelable<Option<Completions>> {
let original_file = db.source_file(position.file_id);
let ctx = ctry!(SyntaxContext::new(db, &original_file, position)?);
let mut acc = Completions::default();
complete_fn_param::complete_fn_param(&mut acc, &ctx);
complete_keyword::complete_expr_keyword(&mut acc, &ctx);
complete_snippet::complete_expr_snippet(&mut acc, &ctx);
complete_snippet::complete_item_snippet(&mut acc, &ctx);
complete_path::complete_path(&mut acc, &ctx)?;
complete_scope::complete_scope(&mut acc, &ctx)?;
Ok(Some(acc))
}
/// `SyntaxContext` is created early during completion to figure out, where
/// exactly is the cursor, syntax-wise.
#[derive(Debug)]
pub(super) struct SyntaxContext<'a> {
db: &'a db::RootDatabase,
offset: TextUnit,
leaf: SyntaxNodeRef<'a>,
module: Option<hir::Module>,
enclosing_fn: Option<ast::FnDef<'a>>,
is_param: bool,
/// A single-indent path, like `foo`.
is_trivial_path: bool,
/// If not a trivial, path, the prefix (qualifier).
path_prefix: Option<hir::Path>,
after_if: bool,
is_stmt: bool,
/// Something is typed at the "top" level, in module or impl/trait.
is_new_item: bool,
}
impl<'a> SyntaxContext<'a> {
pub(super) fn new(
db: &'a db::RootDatabase,
original_file: &'a SourceFileNode,
position: FilePosition,
) -> Cancelable<Option<SyntaxContext<'a>>> {
let module = source_binder::module_from_position(db, position)?;
let leaf =
ctry!(find_leaf_at_offset(original_file.syntax(), position.offset).left_biased());
let mut ctx = SyntaxContext {
db,
leaf,
offset: position.offset,
module,
enclosing_fn: None,
is_param: false,
is_trivial_path: false,
path_prefix: None,
after_if: false,
is_stmt: false,
is_new_item: false,
};
ctx.fill(original_file, position.offset);
Ok(Some(ctx))
}
fn fill(&mut self, original_file: &SourceFileNode, offset: TextUnit) {
// Insert a fake ident to get a valid parse tree. We will use this file
// to determine context, though the original_file will be used for
// actual completion.
let file = {
let edit = AtomTextEdit::insert(offset, "intellijRulezz".to_string());
original_file.reparse(&edit)
};
// First, let's try to complete a reference to some declaration.
if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(file.syntax(), offset) {
// Special case, `trait T { fn foo(i_am_a_name_ref) {} }`.
// See RFC#1685.
if is_node::<ast::Param>(name_ref.syntax()) {
self.is_param = true;
return;
}
self.classify_name_ref(&file, name_ref);
}
// Otherwise, see if this is a declaration. We can use heuristics to
// suggest declaration names, see `CompletionKind::Magic`.
if let Some(name) = find_node_at_offset::<ast::Name>(file.syntax(), offset) {
if is_node::<ast::Param>(name.syntax()) {
self.is_param = true;
return;
}
}
}
fn classify_name_ref(&mut self, file: &SourceFileNode, name_ref: ast::NameRef) {
let name_range = name_ref.syntax().range();
let top_node = name_ref
.syntax()
.ancestors()
.take_while(|it| it.range() == name_range)
.last()
.unwrap();
match top_node.parent().map(|it| it.kind()) {
Some(SOURCE_FILE) | Some(ITEM_LIST) => {
self.is_new_item = true;
return;
}
_ => (),
}
let parent = match name_ref.syntax().parent() {
Some(it) => it,
None => return,
};
if let Some(segment) = ast::PathSegment::cast(parent) {
let path = segment.parent_path();
if let Some(mut path) = hir::Path::from_ast(path) {
if !path.is_ident() {
path.segments.pop().unwrap();
self.path_prefix = Some(path);
return;
}
}
if path.qualifier().is_none() {
self.is_trivial_path = true;
self.enclosing_fn = self
.leaf
.ancestors()
.take_while(|it| it.kind() != SOURCE_FILE && it.kind() != MODULE)
.find_map(ast::FnDef::cast);
self.is_stmt = match name_ref
.syntax()
.ancestors()
.filter_map(ast::ExprStmt::cast)
.next()
{
None => false,
Some(expr_stmt) => expr_stmt.syntax().range() == name_ref.syntax().range(),
};
if let Some(off) = name_ref.syntax().range().start().checked_sub(2.into()) {
if let Some(if_expr) = find_node_at_offset::<ast::IfExpr>(file.syntax(), off) {
if if_expr.syntax().range().end() < name_ref.syntax().range().start() {
self.after_if = true;
}
}
}
}
}
}
}
fn is_node<'a, N: AstNode<'a>>(node: SyntaxNodeRef<'a>) -> bool {
match node.ancestors().filter_map(N::cast).next() {
None => false,
Some(n) => n.syntax().range() == node.range(),
}
}
#[cfg(test)]
fn check_completion(code: &str, expected_completions: &str, kind: CompletionKind) {
use crate::mock_analysis::{single_file_with_position, analysis_and_position};
let (analysis, position) = if code.contains("//-") {
analysis_and_position(code)
} else {
single_file_with_position(code)
};
let completions = completions(&analysis.imp.db, position).unwrap().unwrap();
completions.assert_match(expected_completions, kind);
}
|
