On Feb 7 2013 10:35 AM, andy pugh wrote:
> On 7 February 2013 19:21, Michael Haberler <[email protected]>
> wrote:
>> The question would be rather: "what does it mean to have a HAL
>> string object", for instance 'linking to a string signal', and
>> 'updating a string signal'.
>
> Thinking about this a little more, I am not sure I need string pins,
> but string parameters would be nice.
>
> The idea above of passing a string to be engraved into G-code is an
> interesting one, but string handling inside G-code sounds likely to
> be
> horrible.
> (And might be handled more G-code-ly by passing a parameter number
> that that contains the first character, and the number of characters,
> on two int pins...)
I do not think it will be that bad, BUT that all depends on how you go
about it...
If you start by using programmable calculator program and associate
pins with multiple registers, then you basically have the ability to do
a LOT more than your (p1*p2)+p3 example. You also get logarithms,
exponents, etc... It may or may not be possible to distinguish a
variable type (such as boolean or float<analog>) and continue with the
arithmetic.
Also, if you really want to write an interpreter/generator take a look
at Spirit++ (part of the Boost distribution) which implements YACC and
LEX in a C++ template library and the code actually reads as clearly as
EBNF. It is truly elegant. Also, there are examples which implement
various calculators....
EBo --
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