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LGTM. Thanks for fixing!
I think we could greatly reduce the number of bugs here if we stopped splitting f-strings, and instead recursively ran the parser, like CPython does. But that would involve a bigger architectural change.
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Nice, this syntax was finally added in Rust 1.53.0: https://blog.rust-lang.org/2021/06/17/Rust-1.53.0.html#or-patterns
We could probably clean up the rest of the tokenizer to use this more compact match format.
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Agreed on both counts. Thanks for taking a look |
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0.4.7 - 2022-07-12 Fixed * Fix get_qualified_names_for matching on prefixes of the given name by @lpetre in Instagram/LibCST#719 Added * Implement lazy loading mechanism for expensive metadata providers by @Chenguang-Zhu in Instagram/LibCST#720 0.4.6 - 2022-07-04 New Contributors - @superbobry made their first contribution in Instagram/LibCST#702 Fixed - convert_type_comments now preserves comments following type comments by @superbobry in Instagram/LibCST#702 - QualifiedNameProvider optimizations - Cache the scope name prefix to prevent scope traversal in a tight loop by @lpetre in Instagram/LibCST#708 - Faster qualified name formatting by @lpetre in Instagram/LibCST#710 - Prevent unnecessary work in Scope.get_qualified_names_for_ by @lpetre in Instagram/LibCST#709 - Fix parsing of parenthesized empty tuples by @zsol in Instagram/LibCST#712 - Support whitespace after ParamSlash by @zsol in Instagram/LibCST#713 - [parser] bail on deeply nested expressions by @zsol in Instagram/LibCST#718 0.4.5 - 2022-06-17 New Contributors - @zzl0 made their first contribution in Instagram/LibCST#704 Fixed - Only skip supported escaped characters in f-strings by @zsol in Instagram/LibCST#700 - Escaping quote characters in raw string literals causes a tokenizer error by @zsol in Instagram/LibCST#668 - Corrected a code example in the documentation by @zzl0 in Instagram/LibCST#703 - Handle multiline strings that start with quotes by @zzl0 in Instagram/LibCST#704 - Fixed a performance regression in libcst.metadata.ScopeProvider by @lpetre in Instagram/LibCST#698 0.4.4 - 2022-06-13 New Contributors - @adamchainz made their first contribution in Instagram/LibCST#688 Added - Add package links to PyPI by @adamchainz in Instagram/LibCST#688 - native: add overall benchmark by @zsol in Instagram/LibCST#692 - Add support for PEP-646 by @zsol in Instagram/LibCST#696 Updated - parser: use references instead of smart pointers for Tokens by @zsol in Instagram/LibCST#691
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Summary
When tokenizing f-strings, we should only skip characters that are allowed to be escaped (spec).
Fixes #699
Test Plan
Added test cases.