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|
use smol_str::SmolStr;
use libsyntax2::{
SyntaxKind, SyntaxNodeRef, SyntaxRoot, AstNode,
ast::{self, NameOwner},
algo::{
visit::{visitor, Visitor},
walk::{walk, WalkEvent, preorder},
},
SyntaxKind::*,
};
use TextRange;
#[derive(Debug)]
pub struct StructureNode {
pub parent: Option<usize>,
pub label: String,
pub navigation_range: TextRange,
pub node_range: TextRange,
pub kind: SyntaxKind,
}
#[derive(Debug)]
pub struct FileSymbol {
pub name: SmolStr,
pub node_range: TextRange,
pub kind: SyntaxKind,
}
pub fn file_symbols(file: &ast::File) -> Vec<FileSymbol> {
let syntax = file.syntax();
preorder(syntax.as_ref())
.filter_map(to_symbol)
.collect()
}
fn to_symbol(node: SyntaxNodeRef) -> Option<FileSymbol> {
fn decl<'a, N: NameOwner<&'a SyntaxRoot>>(node: N) -> Option<FileSymbol> {
let name = node.name()?;
Some(FileSymbol {
name: name.text(),
node_range: node.syntax().range(),
kind: node.syntax().kind(),
})
}
visitor()
.visit(decl::<ast::FnDef<_>>)
.visit(decl::<ast::StructDef<_>>)
.visit(decl::<ast::EnumDef<_>>)
.visit(decl::<ast::TraitDef<_>>)
.visit(decl::<ast::Module<_>>)
.visit(decl::<ast::TypeDef<_>>)
.visit(decl::<ast::ConstDef<_>>)
.visit(decl::<ast::StaticDef<_>>)
.accept(node)?
}
pub fn file_structure(file: &ast::File) -> Vec<StructureNode> {
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 structure_node(node) {
Some(mut symbol) => {
symbol.parent = stack.last().map(|&n| n);
stack.push(res.len());
res.push(symbol);
}
None => (),
}
}
WalkEvent::Exit(node) => {
if structure_node(node).is_some() {
stack.pop().unwrap();
}
}
}
}
res
}
fn structure_node(node: SyntaxNodeRef) -> Option<StructureNode> {
fn decl<'a, N: NameOwner<&'a SyntaxRoot>>(node: N) -> Option<StructureNode> {
let name = node.name()?;
Some(StructureNode {
parent: None,
label: name.text().to_string(),
navigation_range: name.syntax().range(),
node_range: node.syntax().range(),
kind: node.syntax().kind(),
})
}
visitor()
.visit(decl::<ast::FnDef<_>>)
.visit(decl::<ast::StructDef<_>>)
.visit(decl::<ast::EnumDef<_>>)
.visit(decl::<ast::TraitDef<_>>)
.visit(decl::<ast::Module<_>>)
.visit(decl::<ast::TypeDef<_>>)
.visit(decl::<ast::ConstDef<_>>)
.visit(decl::<ast::StaticDef<_>>)
.visit(|im: ast::ImplItem<_>| {
let mut label = String::new();
let brace = im.syntax().children()
.find(|it| {
let stop = it.kind() == L_CURLY;
if !stop {
label.push_str(&it.text());
}
stop
})?;
let navigation_range = TextRange::from_to(
im.syntax().range().start(),
brace.range().start(),
);
let node = StructureNode {
parent: None,
label,
navigation_range,
node_range: im.syntax().range(),
kind: im.syntax().kind(),
};
Some(node)
})
.accept(node)?
}
|
