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use smol_str::SmolStr;
use libsyntax2::{
SyntaxKind, SyntaxNodeRef, SyntaxRoot, AstNode,
ast::{self, NameOwner},
algo::{
visit::{visitor, Visitor},
walk::{walk, WalkEvent},
},
};
use TextRange;
#[derive(Debug)]
pub struct FileSymbol {
pub parent: Option<usize>,
pub name: SmolStr,
pub name_range: TextRange,
pub node_range: TextRange,
pub kind: SyntaxKind,
}
pub fn file_symbols(file: &ast::File) -> Vec<FileSymbol> {
let mut res = Vec::new();
let mut stack = Vec::new();
let syntax = file.syntax();
for event in walk(syntax.as_ref()) {
match event {
WalkEvent::Enter(node) => {
match to_symbol(node) {
Some(mut symbol) => {
symbol.parent = stack.last().map(|&n| n);
stack.push(res.len());
res.push(symbol);
}
None => (),
}
}
WalkEvent::Exit(node) => {
if to_symbol(node).is_some() {
stack.pop().unwrap();
}
}
}
}
res
}
fn to_symbol(node: SyntaxNodeRef) -> Option<FileSymbol> {
fn decl<'a, N: NameOwner<&'a SyntaxRoot>>(node: N) -> Option<FileSymbol> {
let name = node.name()?;
Some(FileSymbol {
parent: None,
name: name.text(),
name_range: name.syntax().range(),
node_range: node.syntax().range(),
kind: node.syntax().kind(),
})
}
visitor()
.visit(decl::<ast::Function<_>>)
.visit(decl::<ast::Struct<_>>)
.visit(decl::<ast::Enum<_>>)
.visit(decl::<ast::Trait<_>>)
.visit(decl::<ast::Module<_>>)
.visit(decl::<ast::TypeItem<_>>)
.visit(decl::<ast::ConstItem<_>>)
.visit(decl::<ast::StaticItem<_>>)
.accept(node)?
}
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