Replace regex-based interpolation with character scanner#4747
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shreyas-goenka wants to merge 9 commits intomainfrom
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Replace regex-based interpolation with character scanner#4747shreyas-goenka wants to merge 9 commits intomainfrom
shreyas-goenka wants to merge 9 commits intomainfrom
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- Move interpolation parser to libs/interpolation/ (independent of dyn)
- Use \$ -> $ and \\ -> \ escape sequences (Bash convention)
- Reject nested ${} constructs as errors
- Replace strings.Replace interpolation with token-based concatenation
- Add WarnMalformedReferences mutator for early parse error warnings
- Add NewRefWithDiagnostics for surfacing parse errors as diagnostics
Co-authored-by: Isaac
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Commit: 033b1a2
17 interesting tests: 10 SKIP, 7 KNOWN
Top 20 slowest tests (at least 2 minutes):
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The var_in_var test used ${var.foo_${var.tail}} which relied on
undocumented nested reference behavior (the test itself noted:
"not officially supported... might start to reject this in the future").
The new parser now rejects nested ${} constructs as intended.
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Add acceptance tests for escape sequences, unterminated refs, empty refs, leading digit keys, and dollar-before-non-brace. Consolidate standalone unit tests into table-driven TestParse and TestParseErrors. Add breaking change entry to NEXT_CHANGELOG for nested variable reference rejection. Co-authored-by: Isaac
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…errors Add ParseError type to interpolation package so callers can access the position offset separately from the message. Update WarnMalformedReferences to include the config path (e.g. bundle.name) in diagnostics and incorporate the position into the column location. Remove redundant Validate method. Co-authored-by: Isaac
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The parser now treats outer ${...} prefixes as literal text when a
nested ${ is encountered, allowing inner references to be resolved
first. Multi-round resolution progressively resolves from inside out.
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Shared test cases in libs/interpolation/testdata/variable_references.json are consumed by both the Go parser (TestParsePureVariableReferences) and the Python regex (test_pure_variable_reference) to verify they agree on which strings are pure variable references. When modifying the parser, add test cases to the JSON file so both languages are validated. Co-authored-by: Isaac
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Escape sequences (\$ and \\) are incompatible with multi-round variable
resolution: escapes consumed in round N produce bare ${...} text that
round N+1 incorrectly resolves as a real variable reference. Remove
escape support entirely and defer to a follow-up if needed.
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Note: As a followup we'll also add the ability to escape variable references in the syntax. This work enables us to add fancier syntax for interpolation in DABs and unblocks supporting variable interpolation for the script section in DABs. |
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Suggested reviewersBased on git history of the changed files, these people are best suited to review:
Confidence: high Eligible reviewersBased on CODEOWNERS, these people or teams could also review: @andrewnester, @anton-107, @pietern, @simonfaltum Suggestions based on git history of 40 changed files (7 scored). See CODEOWNERS for path-specific ownership rules. |
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Summary
Replaces the regex-based variable reference parser with a character scanner. No change in interpolation semantics — all existing configurations produce identical results.
libs/interpolation/with structuredParseErrorfor precise diagnosticsWarnMalformedReferencesmutator emits warnings for invalid references like${foo.bar-}testdata/variable_references.json) keep Go parser and Python regex in syncTest plan
go test ./libs/interpolation/..../libs/dyn/dynvar/..../bundle/config/mutator/...var_in_var,var_in_var_3level,malformed_reference,bad_syntax,unterminated_ref,empty_ref,leading_digit_ref,dollar_before_non_braceThis pull request was AI-assisted by Isaac.