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use ra_syntax::{
File, TextRange, SyntaxKind, SyntaxNode, SyntaxNodeRef,
ast::{self, AstNode},
};
use crate::FileId;
use crate::db::SyntaxDatabase;
/// SyntaxPtr is a cheap `Copy` id which identifies a particular syntax node,
/// without retainig syntax tree in memory. You need to explicitelly `resovle`
/// `SyntaxPtr` to get a `SyntaxNode`
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) struct SyntaxPtr {
file_id: FileId,
local: LocalSyntaxPtr,
}
impl SyntaxPtr {
pub(crate) fn new(file_id: FileId, node: SyntaxNodeRef) -> SyntaxPtr {
let local = LocalSyntaxPtr::new(node);
SyntaxPtr { file_id, local }
}
pub(crate) fn resolve(self, db: &impl SyntaxDatabase) -> SyntaxNode {
let syntax = db.file_syntax(self.file_id);
self.local.resolve(&syntax)
}
}
/// A pionter to a syntax node inside a file.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct LocalSyntaxPtr {
range: TextRange,
kind: SyntaxKind,
}
impl LocalSyntaxPtr {
fn new(node: SyntaxNodeRef) -> LocalSyntaxPtr {
LocalSyntaxPtr {
range: node.range(),
kind: node.kind(),
}
}
fn resolve(self, file: &File) -> SyntaxNode {
let mut curr = file.syntax();
loop {
if curr.range() == self.range && curr.kind() == self.kind {
return curr.owned();
}
curr = curr.children()
.find(|it| self.range.is_subrange(&it.range()))
.unwrap_or_else(|| panic!("can't resovle local ptr to SyntaxNode: {:?}", self))
}
}
}
#[test]
fn test_local_syntax_ptr() {
let file = File::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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