Re: New built-ins (`?whatever` things)... any opinions/ideas?

"chose" should really be "either" I think. 

Not sure what's the use of ?char or ?bin_8. 

I like followed_by and dump

Should min and max work on lists instead of single values?

-- Denis.

On 8 Aug 2012, at 08:18, Daniel Dekany <[email protected]> wrote:

> I'm planning to add some new buildins to FreeMarker 2.3.x. I'm not
> sure which of these will go to the next release, but certainly not all
> of them (lack of time...). I would like to hear some opinions, or
> ideas regarding better names and semantics. Also regarding what other
> built-ins you miss.
> 
> boolExp?chose(whenTrue, whenFalse)
> 
>  This one is instead of Java's ternary operator (exp ? exp : exp), that
>  FTL can't have due to syntactical reasons. Of course, the operators
>  are evaluated on demand. It's like #if/#else, but it's an expression.
> 
> n?until(m[, step=1])
> n?to(m[, step=1])
>  These would deprecate the ".." operator, which was sadly
>  mis-designed back then. They create a numerical range, always with
>  step 1 (not -1) unless `step` was provided. "until" has exclusive end,
>  "to" has inclusive end.
> 
> s?safe_substring(from[, to])
> 
>  Same as ?substring, but ignores out-of-ranges
> 
> n?char
> 
>  Converts UCS codepoint to character. Like 65?char is 'A'.
> 
> n?abs
>  Absolute value
> 
> n?[bin|[j]hex|oct]_[8|16|32|64]
>  That is ?bin_8, ?bin_16, ..., hex_8, hex_16. The difference between
>  "hex" and "jhex" is tat the last prints with a 0x prefix.
> 
> n?is_nan, n?is_infinity
>  Works only for numbers, tells if the wrapped number is float or
>  double NaN or Infinitiy (positive or negative).
> 
> exp1?followed_by(exp2)
> 
>  This returns exp1 + exp2, but only if both are defined and are
>  non-0-length strings. This is useful in situations like these:
> 
>    <title>Foo bar<#if extraTitle??> - ${extraTitle}</#if></title>
> 
>  or
> 
>    <#if statement??>${statement};</#if>
> 
>  That is, you want to print an optional variable and when it exists,
>  you also want to print something before or after it. These would
>  become to:
> 
>    <title>Foo bar${' - '?followed_by(extraTitle)}</title>
> 
>    ${statement?followed_by(';')}
> 
> min/max:
> 
>  I wonder how to add min/max functions. `n?min(m)` looks silly IMO.
>  It could be `.min(n, m)` instead, where the initial dot is for the
>  special-variable syntax (used for .data_model, .version and like).
>  Only it's something most user don't know...
> 
> exp?dump
> exp?dump_as_text
> 
>  Prints the value for debugging purposes. ?dump would print it as
>  XHTML, while dump_as_text as text/plain.
> 
> -- 
> Best regards,
> Daniel Dekany
> 
> 
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