microsoft / microsoft/Power-Fx
Text function: some single character text formats result in an error
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- Dominant language
- C#
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- Merged PRs (30d)
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Description
Some single character format strings result in an error from the C# format routine. A character on either side seems to be fine. This behavior doesn't appear to be documented in https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings. We should escape single characters in the C# interpreter.
>> Text( 12, "i" )
Format specifier was invalid.
>> Text( 12, "i " )
"i "
>> Text( 12, " i" )
" i"
>> Text( 12, "j" )
Format specifier was invalid.
>> Text( 12, "k" )
Format specifier was invalid.
>> Text( 12, "l" )
Format specifier was invalid.
>> Text( 12, "z" )
"z"
>> Text( 12, "x" )
"x"
>> Text( 12, "\i" )
"i"
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Research direction
Start with the C# interpreter's Text function and trace how its format string is passed to the C# format routine. Reproduce the examples in the issue, then confirm that single-character formats such as "i", "j", "k", and "l" no longer error while existing multi-character and escaped formats retain their behavior.
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Assessment
- Tech stack
- csharp
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 48/100