54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
|
use crate::{
|
||
|
AstNode, SourceFile, SyntaxKind, SyntaxNode, TextRange,
|
||
|
algo::generate,
|
||
|
};
|
||
|
|
||
|
/// A pointer to a syntax node inside a file. It can be used to remember a
|
||
|
/// specific node across reparses of the same file.
|
||
|
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
||
|
pub struct SyntaxNodePtr {
|
||
|
range: TextRange,
|
||
|
kind: SyntaxKind,
|
||
|
}
|
||
|
|
||
|
impl SyntaxNodePtr {
|
||
|
pub fn new(node: &SyntaxNode) -> SyntaxNodePtr {
|
||
|
SyntaxNodePtr {
|
||
|
range: node.range(),
|
||
|
kind: node.kind(),
|
||
|
}
|
||
|
}
|
||
|
|
||
|
pub fn to_node(self, source_file: &SourceFile) -> &SyntaxNode {
|
||
|
generate(Some(source_file.syntax()), |&node| {
|
||
|
node.children()
|
||
|
.find(|it| self.range.is_subrange(&it.range()))
|
||
|
})
|
||
|
.find(|it| it.range() == self.range && it.kind() == self.kind)
|
||
|
.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 crate::{ast, AstNode};
|
||
|
|
||
|
let file = SourceFile::parse("struct Foo { f: u32, }");
|
||
|
let field = file
|
||
|
.syntax()
|
||
|
.descendants()
|
||
|
.find_map(ast::NamedFieldDef::cast)
|
||
|
.unwrap();
|
||
|
let ptr = SyntaxNodePtr::new(field.syntax());
|
||
|
let field_syntax = ptr.to_node(&file);
|
||
|
assert_eq!(field.syntax(), &*field_syntax);
|
||
|
}
|