[fpc-pascal] else and otherwise in a case statement

2014-12-11 Thread Mark Morgan Lloyd 
I've been doing a bulk replace of 'case..else' to 'case..otherwise' to 
eliminate possible ambiguities that have bitten me in the past, and have 
noticed something interesting under 2.6.4 on x86 Linux.


This is OK:

Ord('.'): case shiftState of
unshifted: mechCode := Corr_88_Period;
shifted:
  else
  end;

This is an error:

Ord('.'): case shiftState of
unshifted: mechCode := Corr_88_Period;
shifted:
  otherwise
  end;

I can fix it like this:

Ord('.'): case shiftState of
unshifted: mechCode := Corr_88_Period;
shifted: ;
  otherwise
  end;

But that grates since I was brought up on ; being a statement separator 
rather than a terminator. Alternatively this is OK:


Ord('.'): case shiftState of
unshifted: mechCode := Corr_88_Period;
shifted:
  end;

but I like having the regular code (in some cases there are active 
otherwise clauses, and I spent enough time with Modula-2 to prefer 
enumerating all possibilities).


Is this difference expected, and what is the best workaround?

--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

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Re: [fpc-pascal] else and otherwise in a case statement

2014-12-11 Thread Howard Page-Clark 

On 11/12/2014 21:07, Mark Morgan Lloyd wrote:

I've been doing a bulk replace of 'case..else' to 'case..otherwise' to
eliminate possible ambiguities that have bitten me in the past, and have
noticed something interesting under 2.6.4 on x86 Linux.


How can else be ambiguous within a case statement?

Howard


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Re: [fpc-pascal] else and otherwise in a case statement

2014-12-11 Thread Ewald 
On 12/11/2014 11:13 PM, Howard Page-Clark wrote:
 On 11/12/2014 21:07, Mark Morgan Lloyd wrote:
 I've been doing a bulk replace of 'case..else' to 'case..otherwise' to
 eliminate possible ambiguities that have bitten me in the past, and have
 noticed something interesting under 2.6.4 on x86 Linux.

 How can else be ambiguous within a case statement?

If one omits the trailing semicolon (the one that's commented), the else
becomes ambiguous:

Case Something of
Value1: ;
Value2: If Condition Then DoSomething (*;*)
Else
End;


-- 
Ewald

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Re: [fpc-pascal] else and otherwise in a case statement

2014-12-11 Thread Mark Morgan Lloyd 

Ewald wrote:

On 12/11/2014 11:13 PM, Howard Page-Clark wrote:

On 11/12/2014 21:07, Mark Morgan Lloyd wrote:

I've been doing a bulk replace of 'case..else' to 'case..otherwise' to
eliminate possible ambiguities that have bitten me in the past, and have
noticed something interesting under 2.6.4 on x86 Linux.

How can else be ambiguous within a case statement?


If one omits the trailing semicolon (the one that's commented), the else
becomes ambiguous:

Case Something of
Value1: ;
Value2: If Condition Then DoSomething (*;*)
Else
End;


Yes, that's the one. When I raised it it was pointed out to me that the 
 otherwise  form was intended as a drop-in replacement to avoid this.


--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]
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