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This repository was archived by the owner on Sep 9, 2025. It is now read-only.
Python TSG: Chained assignment fails to be recognised #402
Description
Python code:
repeat_hi = repeat_lo = repeat_avg = None
The following Stanza fails:
[
(assignment
left: (_) @pattern
right: (_) @value)
(with_item
value:
(as_pattern
(_) @value
alias: (as_pattern_target (_) @pattern)))
]
{
edge @pattern.input -> @value.output
}
Error thrown:
0: Error executing statement edge @pattern.input -> @value.output at (1268, 3)
src/stack-graphs.tsg:1268:3:
1269 | edge @pattern.input -> @value.output
| ^
in stanza
src/stack-graphs.tsg:1258:1:
1258 | [
| ^
matching (assignment) node
benchmark.py:121:9:
121 | repeat_hi = repeat_lo = repeat_avg = None
| ^
1: Evaluating edge sink
2: Undefined scoped variable [syntax node assignment (121, 21)].output
I believe that the TS query is not able to work with chained assignments since the first occurrence of right is incorrect.
[expression_statement](https://tree-sitter.github.io/tree-sitter/playground#) [0, 0] - [0, 41]
[assignment](https://tree-sitter.github.io/tree-sitter/playground#) [0, 0] - [0, 41]
left: [identifier](https://tree-sitter.github.io/tree-sitter/playground#) [0, 0] - [0, 9]
right: [assignment](https://tree-sitter.github.io/tree-sitter/playground#) [0, 12] - [0, 41]
left: [identifier](https://tree-sitter.github.io/tree-sitter/playground#) [0, 12] - [0, 21]
right: [assignment](https://tree-sitter.github.io/tree-sitter/playground#) [0, 24] - [0, 41]
left: [identifier](https://tree-sitter.github.io/tree-sitter/playground#) [0, 24] - [0, 34]
right: [none](https://tree-sitter.github.io/tree-sitter/playground#) [0, 37] - [0, 41]
Activity
SubhamPramanik commentedon Feb 21, 2024
@hendrikvanantwerpen For visibility. Thanks!
CleanCut commentedon Sep 9, 2025
The github/stack-graphs repository is no longer being maintained. As per #502, I'm closing all issues and pull requests before archiving the repository.