topdown: improve scientific notation parsing in extractNumAndUnit #7147
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- Updated extractNumAndUnit to recognize and correctly parse scientific notation, including cases with 'e' or 'E' followed by an exponent (e.g., "1e10", "3.2E4"). - Ensures that 'e' or 'E' is treated as part of the number if followed by digits, enhancing compatibility with scientific notation inputs. - Scientific notation with units now also parses correctly (e.g., "1e10GB" extracts "1e10" as the number and "GB" as the unit). - Maintains behavior for cases without units, allowing either the number or unit portion to be empty, while improving overall string parsing logic. - Added tests for scientific notation parsing in `units.parse_bytes`, including both SI and binary units (e.g., KB, MiB, GiB, KiB). - Included cases for uppercase, lowercase, and mixed case formats with scientific notation. - Added validation for numbers without units defaulting to bytes. Fixes open-policy-agent#7142 Signed-off-by: bakar <[email protected]>
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| if !isNum(r) { | ||
| for idx := 0; idx < len(s); idx++ { | ||
| r := rune(s[idx]) | ||
| if !isNum(r) && r != 'e' && r != 'E' && r != '+' && r != '-' { |
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Why the changes in this PR are needed?
In the units.parser (or specifically in the extractNumAndUnit function in topdown/parse_bytes.go), scientific notation is not currently supported for parsing numeric values with units. This limitation impacts functionality when using OPA Gatekeeper as the policy engine in Kubernetes clusters, where certain resource specifications permit the use of scientific notation. To maintain flexibility and improve user experience, I would like to propose a solution that adds support for scientific notation without altering existing functionality.
What are the changes in this PR?
units.parse_bytes, including both SI and binary units (e.g., KB, MiB, GiB, KiB).Fixes #7142
Signed-off-by: Berdan Akar [email protected]