use hir::{Docs, Documentation}; use ra_syntax::{ ast::{self, AstNode}, TextRange, }; use ra_text_edit::TextEdit; use test_utils::tested_by; use crate::completion::completion_context::CompletionContext; /// `CompletionItem` describes a single completion variant in the editor pop-up. /// It is basically a POD with various properties. To construct a /// `CompletionItem`, use `new` method and the `Builder` struct. #[derive(Debug)] pub struct CompletionItem { /// Used only internally in tests, to check only specific kind of /// completion. completion_kind: CompletionKind, label: String, kind: Option, detail: Option, documentation: Option, lookup: Option, insert_text: Option, insert_text_format: InsertTextFormat, /// Where completion occurs. `source_range` must contain the completion offset. /// `insert_text` should start with what `source_range` points to, or VSCode /// will filter out the completion silently. source_range: TextRange, /// Additional text edit, ranges in `text_edit` must never intersect with `source_range`. /// Or VSCode will drop it silently. text_edit: Option, } #[derive(Debug, Clone, Copy, PartialEq, Eq)] pub enum CompletionItemKind { Snippet, Keyword, Module, Function, Struct, Enum, EnumVariant, Binding, Field, Static, Const, Trait, TypeAlias, Method, } #[derive(Debug, PartialEq, Eq, Copy, Clone)] pub(crate) enum CompletionKind { /// Parser-based keyword completion. Keyword, /// Your usual "complete all valid identifiers". Reference, /// "Secret sauce" completions. Magic, Snippet, Postfix, } #[derive(Debug, PartialEq, Eq, Copy, Clone)] pub enum InsertTextFormat { PlainText, Snippet, } impl CompletionItem { pub(crate) fn new( completion_kind: CompletionKind, replace_range: TextRange, label: impl Into, ) -> Builder { let label = label.into(); Builder { source_range: replace_range, completion_kind, label, insert_text: None, insert_text_format: InsertTextFormat::PlainText, detail: None, documentation: None, lookup: None, kind: None, text_edit: None, } } /// What user sees in pop-up in the UI. pub fn label(&self) -> &str { &self.label } /// Short one-line additional information, like a type pub fn detail(&self) -> Option<&str> { self.detail.as_ref().map(|it| it.as_str()) } /// A doc-comment pub fn documentation(&self) -> Option<&str> { self.documentation.as_ref().map(|it| it.contents()) } /// What string is used for filtering. pub fn lookup(&self) -> &str { self.lookup .as_ref() .map(|it| it.as_str()) .unwrap_or(self.label()) } pub fn insert_text_format(&self) -> InsertTextFormat { self.insert_text_format.clone() } pub fn insert_text(&self) -> String { match &self.insert_text { Some(t) => t.clone(), None => self.label.clone(), } } pub fn kind(&self) -> Option { self.kind } pub fn take_text_edit(&mut self) -> Option { self.text_edit.take() } pub fn source_range(&self) -> TextRange { self.source_range } } /// A helper to make `CompletionItem`s. #[must_use] pub(crate) struct Builder { source_range: TextRange, completion_kind: CompletionKind, label: String, insert_text: Option, insert_text_format: InsertTextFormat, detail: Option, documentation: Option, lookup: Option, kind: Option, text_edit: Option, } impl Builder { pub(crate) fn add_to(self, acc: &mut Completions) { acc.add(self.build()) } pub(crate) fn build(self) -> CompletionItem { CompletionItem { source_range: self.source_range, label: self.label, detail: self.detail, documentation: self.documentation, insert_text_format: self.insert_text_format, lookup: self.lookup, kind: self.kind, completion_kind: self.completion_kind, text_edit: self.text_edit, insert_text: self.insert_text, } } pub(crate) fn lookup_by(mut self, lookup: impl Into) -> Builder { self.lookup = Some(lookup.into()); self } pub(crate) fn insert_text(mut self, insert_text: impl Into) -> Builder { self.insert_text = Some(insert_text.into()); self } #[allow(unused)] pub(crate) fn insert_text_format(mut self, insert_text_format: InsertTextFormat) -> Builder { self.insert_text_format = insert_text_format; self } pub(crate) fn snippet(mut self, snippet: impl Into) -> Builder { self.insert_text_format = InsertTextFormat::Snippet; self.insert_text(snippet) } pub(crate) fn kind(mut self, kind: CompletionItemKind) -> Builder { self.kind = Some(kind); self } #[allow(unused)] pub(crate) fn text_edit(mut self, edit: TextEdit) -> Builder { self.text_edit = Some(edit); self } #[allow(unused)] pub(crate) fn detail(self, detail: impl Into) -> Builder { self.set_detail(Some(detail)) } pub(crate) fn set_detail(mut self, detail: Option>) -> Builder { self.detail = detail.map(Into::into); self } #[allow(unused)] pub(crate) fn documentation(self, docs: Documentation) -> Builder { self.set_documentation(Some(docs)) } pub(crate) fn set_documentation(mut self, docs: Option) -> Builder { self.documentation = docs.map(Into::into); self } pub(super) fn from_resolution( mut self, ctx: &CompletionContext, resolution: &hir::Resolution, ) -> Builder { let def = resolution .def_id .take_types() .or(resolution.def_id.take_values()); let def = match def { None => return self, Some(it) => it, }; let (kind, docs) = match def { hir::ModuleDef::Module(_) => (CompletionItemKind::Module, None), hir::ModuleDef::Function(func) => return self.from_function(ctx, func), hir::ModuleDef::Struct(it) => (CompletionItemKind::Struct, it.docs(ctx.db)), hir::ModuleDef::Enum(it) => (CompletionItemKind::Enum, it.docs(ctx.db)), hir::ModuleDef::Def(def_id) => match def_id.resolve(ctx.db) { hir::Def::Trait(it) => (CompletionItemKind::Trait, it.docs(ctx.db)), hir::Def::Type(it) => (CompletionItemKind::TypeAlias, it.docs(ctx.db)), hir::Def::Const(it) => (CompletionItemKind::Const, it.docs(ctx.db)), hir::Def::Static(it) => (CompletionItemKind::Static, it.docs(ctx.db)), _ => return self, }, }; self.kind = Some(kind); self.documentation = docs; self } pub(super) fn from_function( mut self, ctx: &CompletionContext, function: hir::Function, ) -> Builder { // If not an import, add parenthesis automatically. if ctx.use_item_syntax.is_none() && !ctx.is_call { tested_by!(inserts_parens_for_function_calls); let sig = function.signature(ctx.db); if sig.params().is_empty() || sig.has_self_param() && sig.params().len() == 1 { self.insert_text = Some(format!("{}()$0", self.label)); } else { self.insert_text = Some(format!("{}($0)", self.label)); } self.insert_text_format = InsertTextFormat::Snippet; } if let Some(docs) = function.docs(ctx.db) { self.documentation = Some(docs); } if let Some(label) = function_label(ctx, function) { self.detail = Some(label); } self.kind = Some(CompletionItemKind::Function); self } } impl<'a> Into for Builder { fn into(self) -> CompletionItem { self.build() } } /// Represents an in-progress set of completions being built. #[derive(Debug, Default)] pub(crate) struct Completions { buf: Vec, } impl Completions { pub(crate) fn add(&mut self, item: impl Into) { self.buf.push(item.into()) } pub(crate) fn add_all(&mut self, items: I) where I: IntoIterator, I::Item: Into, { items.into_iter().for_each(|item| self.add(item.into())) } } impl Into> for Completions { fn into(self) -> Vec { self.buf } } fn function_label(ctx: &CompletionContext, function: hir::Function) -> Option { let node = function.source(ctx.db).1; let label: String = if let Some(body) = node.body() { let body_range = body.syntax().range(); let label: String = node .syntax() .children() .filter(|child| !child.range().is_subrange(&body_range)) // Filter out body .filter(|child| ast::Comment::cast(child).is_none()) // Filter out comments .map(|node| node.text().to_string()) .collect(); label } else { node.syntax().text().to_string() }; Some(label.trim().to_owned()) } #[cfg(test)] pub(crate) fn check_completion(test_name: &str, code: &str, kind: CompletionKind) { use crate::mock_analysis::{single_file_with_position, analysis_and_position}; use crate::completion::completions; use insta::assert_debug_snapshot_matches; let (analysis, position) = if code.contains("//-") { analysis_and_position(code) } else { single_file_with_position(code) }; let completions = completions(&analysis.db, position).unwrap(); let completion_items: Vec = completions.into(); let kind_completions: Vec = completion_items .into_iter() .filter(|c| c.completion_kind == kind) .collect(); assert_debug_snapshot_matches!(test_name, kind_completions); } #[cfg(test)] mod tests { use test_utils::covers; use super::*; fn check_reference_completion(code: &str, expected_completions: &str) { check_completion(code, expected_completions, CompletionKind::Reference); } #[test] fn inserts_parens_for_function_calls() { covers!(inserts_parens_for_function_calls); check_reference_completion( "inserts_parens_for_function_calls1", r" fn no_args() {} fn main() { no_<|> } ", ); check_reference_completion( "inserts_parens_for_function_calls2", r" fn with_args(x: i32, y: String) {} fn main() { with_<|> } ", ); check_reference_completion( "inserts_parens_for_function_calls3", r" struct S {} impl S { fn foo(&self) {} } fn bar(s: &S) { s.f<|> } ", ) } #[test] fn dont_render_function_parens_in_use_item() { check_reference_completion( "dont_render_function_parens_in_use_item", " //- /lib.rs mod m { pub fn foo() {} } use crate::m::f<|>; ", ) } #[test] fn dont_render_function_parens_if_already_call() { check_reference_completion( "dont_render_function_parens_if_already_call", " //- /lib.rs fn frobnicate() {} fn main() { frob<|>(); } ", ) } }