Is there a function to check whether some string is a legal identifier?

Saaa wrote:
> Is there a function to check whether some string is a legal identifier?
> 
> 

Sure.

static if(is(typeof({ /* code to be checked for validity goes here */ }))) ...

> Saaa wrote:
>> Is there a function to check whether some string is a legal identifier?
>>
>>
>
> Sure.
>
> static if(is(typeof({ /* code to be checked for validity goes here */ }))) ...

That is a compile time check, right?
I meant a runtime check.

How does that piece of code work anyways :D
static if = compile time if
is = comparison between two non value things?
typeof = returns the type

I know use this (in the ddata thread above):

foreach(char c; identifier)
{
 if( !inPattern( c, `_a-zA-Z0-9`) )
 {
  return false;
 }
}

Saaa wrote:
> ...
> 
> I know use this (in the ddata thread above):
> 
> foreach(char c; identifier)
> {
>  if( !inPattern( c, `_a-zA-Z0-9`) )
>  {
>   return false;
>  }
> }

That's not correct.  http://digitalmars.com/d/1.0/lex.html#identifier

Hello Saaa,

>> static if(is(typeof({ /* code to be checked for validity goes here */
>> }))) ...
>> 
> How does that piece of code work anyways :D


that checks to see if the {...} is a valid delegate literal by using is() to see if semantic checks fail.

>> I know use this (in the ddata thread above):
>>
>> foreach(char c; identifier)
>> {
>>  if( !inPattern( c, `_a-zA-Z0-9`) )
>>  {
>>   return false;
>>  }
>> }
>
> That's not correct.  http://digitalmars.com/d/1.0/lex.html#identifier
Which is why I asked for it here :)
It isn't extremely important as it is just a data format, but I would like
to be as D as possible.

> Hello Saaa,
>
>>> static if(is(typeof({ /* code to be checked for validity goes here */
>>> }))) ...
>>>
>> How does that piece of code work anyways :D
>
>
> that checks to see if the {...} is a valid delegate literal by using is() to see if semantic checks fail.
>
Ah, I see. Can this be done at runtime?

Saaa wrote:
>> Hello Saaa,
>>
>>>> static if(is(typeof({ /* code to be checked for validity goes here */
>>>> }))) ...
>>>>
>>> How does that piece of code work anyways :D
>>
>> that checks to see if the {...} is a valid delegate literal by using is() to see if semantic checks fail.
>>
> Ah, I see. Can this be done at runtime? 


You have to write it yourself. Here's a good starting point:
http://www.digitalmars.com/d/1.0/lex.html#identifier

>
> You have to write it yourself. Here's a good starting point: http://www.digitalmars.com/d/1.0/lex.html#identifier

Yes, that was my starting point and it seemed quite complex, thus my
question :)
I think I'll stay with my simple check for now as it isn't really necessary
to be as strict as D's identifiers.
Just thought that if there was an easy check I'd implement that.
Thanks anyways everybody.

Hello Saaa,

>> You have to write it yourself. Here's a good starting point:
>> http://www.digitalmars.com/d/1.0/lex.html#identifier
>> 
> Yes, that was my starting point and it seemed quite complex, thus my
> question :)
> I think I'll stay with my simple check for now as it isn't really
> necessary
> to be as strict as D's identifiers.
> Just thought that if there was an easy check I'd implement that.
> Thanks anyways everybody.

if you are only working with ASCII: use the regex `_A-Za-z[_A-Za-z0-9]*`