Re: Regular Expression Explanation for 'function.lang'

Hi

do procedure (and functions) are always called on a line?
I mean, is the procedure name always at the beginning of a line 
(possibly with some spaces before)?

Are commas used also in other contexts besides function and procedure 
invocation?

cheers
	Lorenzo

P.S. some examples of programs might be useful to do some tests; have 
you already a partial language definition for IDL to start from?

On 05/24/2011 05:27 PM, Peter Willis wrote:
> On 5/23/2011 7:10 AM, Lorenzo Bettini wrote:
>
>> (?=\()
>>
>> checks whether after the name there's a ( but does not consume it
>>
>> can the syntax of your procedure definition be identified with a regular
>> expression?
>>
>> Can you make some examples of procedures?
>>
>> cheers
>> Lorenzo
>
>
> Hello,
>
> In 'IDL' procedures are *called* in the following way:
>
> PROCEDURE_NAME , ARGUMENT_1, ARGUMENT_2, ARGUMENT_3, .... , ARGUMENT_N
>
> As you can see no brackets or parenthesis are used. The problem here is
> a regex would need to deal with only the first case of the
> comma positioned after 'PROCEDURE_NAME' and ignore all other groupings
> until the end of the statement.
>
> There is also on other problem in that statements can use continuation
> where a '$' indicates the current statement continues on to the
> next line:
>
> PROCEDURE_NAME , ARGUMENT_1, $
> ARGUMENT_2, ARGUMENT_3, $
> .... , ARGUMENT_N
>
> In this case regex needs to distinguish between the case of
> 'PRODEDURE_NAME' and cases where the statement has been continued.
> ie: not highlight 'ARGUMENT_2' due to the comma following there.
>
>
> Declarations for *both* functions and procedures are written in
> similar ways. The difference is only the 'RETURN' value in the case
> of functions:
>
> FUNCTION function_name, arg_1, arg_2 $
> arg_3, arg_4, ...., arg_n
> ....<PROGRAM STATEMENTS>...
>
> RETURN, some_value
> END
>
>
> PRO procedure_name, arg_1, arg_2 arg_3, arg_4, ....,$
> arg_n
> ....<PROGRAM STATEMENTS>...
> END
>
>
>
> Best Regards,
>
>
> Peter
>
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