54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
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use crate::{
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AstNode, SourceFile, SyntaxKind, SyntaxNode, TextRange,
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algo::generate,
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};
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/// A pointer to a syntax node inside a file. It can be used to remember a
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/// specific node across reparses of the same file.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct SyntaxNodePtr {
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range: TextRange,
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kind: SyntaxKind,
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}
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impl SyntaxNodePtr {
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pub fn new(node: &SyntaxNode) -> SyntaxNodePtr {
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SyntaxNodePtr {
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range: node.range(),
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kind: node.kind(),
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}
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}
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pub fn to_node(self, source_file: &SourceFile) -> &SyntaxNode {
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generate(Some(source_file.syntax()), |&node| {
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node.children()
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.find(|it| self.range.is_subrange(&it.range()))
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})
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.find(|it| it.range() == self.range && it.kind() == self.kind)
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.unwrap_or_else(|| panic!("can't resolve local ptr to SyntaxNode: {:?}", self))
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}
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pub fn range(self) -> TextRange {
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self.range
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}
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pub fn kind(self) -> SyntaxKind {
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self.kind
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}
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}
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#[test]
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fn test_local_syntax_ptr() {
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use crate::{ast, AstNode};
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let file = SourceFile::parse("struct Foo { f: u32, }");
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let field = file
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.syntax()
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.descendants()
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.find_map(ast::NamedFieldDef::cast)
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.unwrap();
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let ptr = SyntaxNodePtr::new(field.syntax());
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let field_syntax = ptr.to_node(&file);
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assert_eq!(field.syntax(), &*field_syntax);
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}
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