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|
use crate::TextRange;
use ra_syntax::{
algo::visit::{visitor, Visitor},
ast::{self, NameOwner},
AstNode, SourceFile, SyntaxKind, SyntaxNode, WalkEvent,
};
#[derive(Debug, Clone)]
pub struct StructureNode {
pub parent: Option<usize>,
pub label: String,
pub navigation_range: TextRange,
pub node_range: TextRange,
pub kind: SyntaxKind,
}
pub fn file_structure(file: &SourceFile) -> Vec<StructureNode> {
let mut res = Vec::new();
let mut stack = Vec::new();
for event in file.syntax().preorder() {
match event {
WalkEvent::Enter(node) => {
if let Some(mut symbol) = structure_node(node) {
symbol.parent = stack.last().map(|&n| n);
stack.push(res.len());
res.push(symbol);
}
}
WalkEvent::Leave(node) => {
if structure_node(node).is_some() {
stack.pop().unwrap();
}
}
}
}
res
}
fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
fn decl<N: NameOwner>(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::NamedFieldDef>)
.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::ImplBlock| {
let target_type = im.target_type()?;
let target_trait = im.target_trait();
let label = match target_trait {
None => format!("impl {}", target_type.syntax().text()),
Some(t) => format!(
"impl {} for {}",
t.syntax().text(),
target_type.syntax().text(),
),
};
let node = StructureNode {
parent: None,
label,
navigation_range: target_type.syntax().range(),
node_range: im.syntax().range(),
kind: im.syntax().kind(),
};
Some(node)
})
.accept(node)?
}
#[cfg(test)]
mod tests {
use super::*;
use insta::assert_debug_snapshot_matches;
#[test]
fn test_file_structure() {
let file = SourceFile::parse(
r#"
struct Foo {
x: i32
}
mod m {
fn bar() {}
}
enum E { X, Y(i32) }
type T = ();
static S: i32 = 92;
const C: i32 = 92;
impl E {}
impl fmt::Debug for E {}
"#,
);
let structure = file_structure(&file);
assert_debug_snapshot_matches!("file_structure", structure);
}
}
|
