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use ra_syntax::{AstNode, SourceFile, SyntaxKind, SyntaxNode, TextRange, TreeArc};
/// A pointer to a syntax node inside a file.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct LocalSyntaxPtr {
range: TextRange,
kind: SyntaxKind,
}
impl LocalSyntaxPtr {
pub fn new(node: &SyntaxNode) -> LocalSyntaxPtr {
LocalSyntaxPtr {
range: node.range(),
kind: node.kind(),
}
}
pub fn resolve(self, file: &SourceFile) -> TreeArc<SyntaxNode> {
let mut curr = file.syntax();
loop {
if curr.range() == self.range && curr.kind() == self.kind {
return curr.to_owned();
}
curr = curr
.children()
.find(|it| self.range.is_subrange(&it.range()))
.unwrap_or_else(|| panic!("can't resolve local ptr to SyntaxNode: {:?}", self))
}
}
pub fn range(self) -> TextRange {
self.range
}
pub fn kind(self) -> SyntaxKind {
self.kind
}
}
#[test]
fn test_local_syntax_ptr() {
use ra_syntax::{ast, AstNode};
let file = SourceFile::parse("struct Foo { f: u32, }");
let field = file
.syntax()
.descendants()
.find_map(ast::NamedFieldDef::cast)
.unwrap();
let ptr = LocalSyntaxPtr::new(field.syntax());
let field_syntax = ptr.resolve(&file);
assert_eq!(field.syntax(), &*field_syntax);
}
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