442 lines
14 KiB
Rust
442 lines
14 KiB
Rust
use ra_syntax::{
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ast::{self, AttrsOwner, NameOwner, TypeAscriptionOwner, TypeParamsOwner},
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match_ast, AstNode, SourceFile, SyntaxKind, SyntaxNode, TextRange, WalkEvent,
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};
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#[derive(Debug, Clone)]
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pub struct StructureNode {
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pub parent: Option<usize>,
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pub label: String,
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pub navigation_range: TextRange,
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pub node_range: TextRange,
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pub kind: SyntaxKind,
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pub detail: Option<String>,
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pub deprecated: bool,
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}
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// Feature: File Structure
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//
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// Provides a tree of the symbols defined in the file. Can be used to
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//
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// * fuzzy search symbol in a file (super useful)
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// * draw breadcrumbs to describe the context around the cursor
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// * draw outline of the file
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//
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// |===
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// | Editor | Shortcut
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//
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// | VS Code | kbd:[Ctrl+Shift+O]
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// |===
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pub fn file_structure(file: &SourceFile) -> Vec<StructureNode> {
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let mut res = Vec::new();
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let mut stack = Vec::new();
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for event in file.syntax().preorder() {
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match event {
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WalkEvent::Enter(node) => {
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if let Some(mut symbol) = structure_node(&node) {
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symbol.parent = stack.last().copied();
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stack.push(res.len());
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res.push(symbol);
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}
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}
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WalkEvent::Leave(node) => {
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if structure_node(&node).is_some() {
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stack.pop().unwrap();
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}
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}
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}
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}
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res
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}
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fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
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fn decl<N: NameOwner + AttrsOwner>(node: N) -> Option<StructureNode> {
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decl_with_detail(node, None)
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}
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fn decl_with_ascription<N: NameOwner + AttrsOwner + TypeAscriptionOwner>(
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node: N,
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) -> Option<StructureNode> {
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let ty = node.ascribed_type();
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decl_with_type_ref(node, ty)
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}
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fn decl_with_type_ref<N: NameOwner + AttrsOwner>(
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node: N,
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type_ref: Option<ast::TypeRef>,
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) -> Option<StructureNode> {
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let detail = type_ref.map(|type_ref| {
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let mut detail = String::new();
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collapse_ws(type_ref.syntax(), &mut detail);
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detail
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});
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decl_with_detail(node, detail)
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}
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fn decl_with_detail<N: NameOwner + AttrsOwner>(
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node: N,
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detail: Option<String>,
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) -> Option<StructureNode> {
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let name = node.name()?;
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Some(StructureNode {
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parent: None,
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label: name.text().to_string(),
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navigation_range: name.syntax().text_range(),
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node_range: node.syntax().text_range(),
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kind: node.syntax().kind(),
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detail,
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deprecated: node.attrs().filter_map(|x| x.simple_name()).any(|x| x == "deprecated"),
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})
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}
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fn collapse_ws(node: &SyntaxNode, output: &mut String) {
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let mut can_insert_ws = false;
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node.text().for_each_chunk(|chunk| {
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for line in chunk.lines() {
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let line = line.trim();
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if line.is_empty() {
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if can_insert_ws {
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output.push(' ');
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can_insert_ws = false;
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}
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} else {
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output.push_str(line);
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can_insert_ws = true;
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}
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}
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})
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}
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match_ast! {
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match node {
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ast::Fn(it) => {
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let mut detail = String::from("fn");
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if let Some(type_param_list) = it.type_param_list() {
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collapse_ws(type_param_list.syntax(), &mut detail);
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}
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if let Some(param_list) = it.param_list() {
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collapse_ws(param_list.syntax(), &mut detail);
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}
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if let Some(ret_type) = it.ret_type() {
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detail.push_str(" ");
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collapse_ws(ret_type.syntax(), &mut detail);
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}
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decl_with_detail(it, Some(detail))
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},
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ast::StructDef(it) => decl(it),
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ast::UnionDef(it) => decl(it),
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ast::EnumDef(it) => decl(it),
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ast::EnumVariant(it) => decl(it),
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ast::TraitDef(it) => decl(it),
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ast::Module(it) => decl(it),
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ast::TypeAlias(it) => {
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let ty = it.type_ref();
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decl_with_type_ref(it, ty)
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},
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ast::RecordFieldDef(it) => decl_with_ascription(it),
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ast::ConstDef(it) => decl_with_ascription(it),
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ast::StaticDef(it) => decl_with_ascription(it),
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ast::ImplDef(it) => {
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let target_type = it.target_type()?;
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let target_trait = it.target_trait();
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let label = match target_trait {
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None => format!("impl {}", target_type.syntax().text()),
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Some(t) => {
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format!("impl {} for {}", t.syntax().text(), target_type.syntax().text(),)
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}
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};
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let node = StructureNode {
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parent: None,
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label,
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navigation_range: target_type.syntax().text_range(),
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node_range: it.syntax().text_range(),
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kind: it.syntax().kind(),
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detail: None,
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deprecated: false,
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};
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Some(node)
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},
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ast::MacroCall(it) => {
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match it.path().and_then(|it| it.segment()).and_then(|it| it.name_ref()) {
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Some(path_segment) if path_segment.text() == "macro_rules"
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=> decl(it),
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_ => None,
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}
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},
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_ => None,
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use expect::{expect, Expect};
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use super::*;
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fn check(ra_fixture: &str, expect: Expect) {
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let file = SourceFile::parse(ra_fixture).ok().unwrap();
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let structure = file_structure(&file);
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expect.assert_debug_eq(&structure)
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}
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#[test]
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fn test_file_structure() {
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check(
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r#"
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struct Foo {
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x: i32
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}
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mod m {
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fn bar1() {}
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fn bar2<T>(t: T) -> T {}
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fn bar3<A,
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B>(a: A,
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b: B) -> Vec<
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u32
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> {}
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}
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enum E { X, Y(i32) }
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type T = ();
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static S: i32 = 92;
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const C: i32 = 92;
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impl E {}
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impl fmt::Debug for E {}
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macro_rules! mc {
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() => {}
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}
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#[macro_export]
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macro_rules! mcexp {
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() => {}
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}
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/// Doc comment
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macro_rules! mcexp {
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() => {}
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}
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#[deprecated]
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fn obsolete() {}
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#[deprecated(note = "for awhile")]
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fn very_obsolete() {}
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"#,
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expect![[r#"
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[
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StructureNode {
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parent: None,
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label: "Foo",
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navigation_range: 8..11,
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node_range: 1..26,
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kind: STRUCT_DEF,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: Some(
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0,
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),
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label: "x",
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navigation_range: 18..19,
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node_range: 18..24,
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kind: RECORD_FIELD_DEF,
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detail: Some(
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"i32",
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),
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "m",
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navigation_range: 32..33,
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node_range: 28..158,
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kind: MODULE,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: Some(
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2,
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),
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label: "bar1",
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navigation_range: 43..47,
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node_range: 40..52,
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kind: FN,
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detail: Some(
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"fn()",
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),
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deprecated: false,
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},
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StructureNode {
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parent: Some(
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2,
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),
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label: "bar2",
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navigation_range: 60..64,
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node_range: 57..81,
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kind: FN,
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detail: Some(
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"fn<T>(t: T) -> T",
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),
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deprecated: false,
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},
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StructureNode {
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parent: Some(
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2,
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),
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label: "bar3",
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navigation_range: 89..93,
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node_range: 86..156,
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kind: FN,
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detail: Some(
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"fn<A, B>(a: A, b: B) -> Vec< u32 >",
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),
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "E",
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navigation_range: 165..166,
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node_range: 160..180,
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kind: ENUM_DEF,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: Some(
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6,
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),
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label: "X",
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navigation_range: 169..170,
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node_range: 169..170,
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kind: ENUM_VARIANT,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: Some(
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6,
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),
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label: "Y",
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navigation_range: 172..173,
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node_range: 172..178,
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kind: ENUM_VARIANT,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "T",
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navigation_range: 186..187,
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node_range: 181..193,
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kind: TYPE_ALIAS,
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detail: Some(
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"()",
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),
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "S",
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navigation_range: 201..202,
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node_range: 194..213,
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kind: STATIC_DEF,
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detail: Some(
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"i32",
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),
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "C",
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navigation_range: 220..221,
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node_range: 214..232,
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kind: CONST_DEF,
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detail: Some(
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"i32",
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),
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "impl E",
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navigation_range: 239..240,
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node_range: 234..243,
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kind: IMPL_DEF,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "impl fmt::Debug for E",
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navigation_range: 265..266,
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node_range: 245..269,
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kind: IMPL_DEF,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "mc",
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navigation_range: 284..286,
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node_range: 271..303,
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kind: MACRO_CALL,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "mcexp",
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navigation_range: 334..339,
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node_range: 305..356,
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kind: MACRO_CALL,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "mcexp",
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navigation_range: 387..392,
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node_range: 358..409,
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kind: MACRO_CALL,
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detail: None,
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deprecated: false,
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},
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StructureNode {
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parent: None,
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label: "obsolete",
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navigation_range: 428..436,
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node_range: 411..441,
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kind: FN,
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detail: Some(
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"fn()",
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),
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deprecated: true,
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},
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StructureNode {
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parent: None,
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label: "very_obsolete",
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navigation_range: 481..494,
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node_range: 443..499,
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kind: FN,
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detail: Some(
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"fn()",
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),
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deprecated: true,
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},
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]
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"#]],
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);
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}
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}
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