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From: Ruvim <ruvim.pinka@gmail.com>
Newsgroups: comp.lang.forth
Subject: Re: Parsing timestamps?
Date: Sun, 6 Oct 2024 17:22:53 +0400
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On 2024-10-06 15:59, dxf wrote:
> On 6/10/2024 9:48 pm, Ruvim wrote:
>> On 2024-10-06 11:51, dxf wrote:
>>> Is there an easier way of doing this?  End goal is a double number representing centi-secs.
>>>
>>>
>>> empty decimal
>>>
>>> : SPLIT ( a u c -- a2 u2 a3 u3 )  >r 2dup r> scan 2swap 2 pick - ;
>>> : >INT ( adr len -- u )  0 0 2swap >number 2drop drop ;
>>>
>>> : /T ( a u -- $hour $min $sec )
>>>     2 0 do  [char] : split  2swap  dup if 1 /string then  loop
>>>     2 0 do  dup 0= if 2rot 2rot then  loop ;
>>>
>>> : .T  2swap 2rot  cr  >int . ." hr "  >int . ." min " >int . ." sec " ;
>>>
>>> s" 1:2:3"    /t .t
>>> s" 02:03"    /t .t
>>> s" 03"       /t .t
>>> s" 23:59:59" /t .t
>>> s" 0:00:03"  /t .t
>>
>>
>> I would use `split-string` factor as:
>>
>>    : /t ( sd.time -- sd.hour sd.min sd.sec )
>>      s" :" split-string
>>      s" :" split-string
>>    ;
>>
>>    \ Where
>>
>>    : split-string
>>      ( sd.text sd.separator -- sd.left sd.right | sd.text 0 0 )
>>      dup >r  3 pick >r  ( R: u.[sd.separator][1] addr.[st.text][2] )
>>      search 0= if 2rdrop 0 0 exit then ( addr u )
>>      over r@ - r> swap  2swap r> /string
>>    ;
> 
> It fails with s" 03".  The test case may be unreasonable so I tried
> s" :03"  however it also fails.  The complication is most tools scan
> from the beginning whereas we would like to scan from the end.


You did not provide output for test cases.

I expect that "03" is equivalent to "03:00:00", which means 3 hours, 0 
minutes, 0 seconds.
And ":03" is equivalent to "00:03:00", which means 0 hours, 3 minutes, 0 
seconds.

My above implementation for `/t` produces:

   s" 1:2:3"   /t .t   \ "1 hr 2 min 3 sec"
   s" 02:03"   /t .t   \ "2 hr 3 min 0 sec"
   s" 03"      /t .t   \ "3 hr 0 min 0 sec"
   s" :03"     /t .t   \ "0 hr 3 min 0 sec"


What is wrong?

Maybe your `>int` works incorrectly with an empty string?


For testing I use:

   : >int ( sd.number -- u ) 0. 2swap >number 2drop drop ;
   \ the empty string produces 0


--
Ruvim