ddekany commented on PR #111:
URL: https://github.com/apache/freemarker/pull/111#issuecomment-2254534147
My reservation is that while `s!?is_blank` is a neat trick, it only solves 1
uses cases out of the 2:
- Use-case 1: `<#if s is null or blank>`, but also, often we need the
opposite, `<#if s is not null, nor blank>`
- With `?is_blank`: `<#if s!?is_blank>`, and the opposite is `<#if
!s!?is_blank>`
- With `?blank_to_null`: `<#if !s?blank_to_null??>`, and the opposite is
`<#if s?blank_to_null??>`
- With `~` operator: `<#if !s~??>`, and the opposite is `<#if s~??>`
- Use-case 2: `get the value of s, but if it's null or blank, then evaluate
to default value 'D'`
- With `?is_blank`: It's doesn't solve the use case (or is way too
verbose).
- With `?blank_to_null`: `s?blank_to_null!'D'`
- With `~` operator: `s~!'D'`
Admittedly in use-case 1 `?is_blank` tells more directly what it wants, but
OTOH `?blank_to_null` reduces the problem to the missing value handling
problem, and so will work with other existing missing value handling mechanism
as well, like macro argument defaults, passing `null` to Java methods, or
anything else that will be added in the future.
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