Re: Strength of sequence vs alternative parsers

Not basically... excatly. Spirit is pure C++, just (ab)using operator overload to construct parsers.

  /Mikael

-----Original Message-----
From: Michael Powell [mailto:[email protected]] 
Sent: Wednesday, December 6, 2017 16:19
To: Spirit General Mailing List <[email protected]>
Subject: Re: [Spirit-general] Strength of sequence vs alternative parsers

On Wed, Dec 6, 2017 at 10:13 AM, Mikael Asplund <[email protected]> wrote:
> http://en.cppreference.com/w/cpp/language/operator_precedence

Ah, I see. Basically honoring the same language operator precedence rules. Incredible, awesome! Thanks...

> So, yes...
>
>   /Mikael
>
> -----Original Message-----
> From: Michael Powell [mailto:[email protected]]
> Sent: Wednesday, December 6, 2017 16:08
> To: Spirit General Mailing List <[email protected]>
> Subject: [Spirit-general] Strength of sequence vs alternative parsers
>
> Hello,
>
> Am I correct in observing that the Sequence parser (>>) is stronger than the alternative parser (|)?
>
> i.e.
>
> my_rule = a >> b >> c | d >> e >> f ;
>
> So, in other words, parenthesis are unnecessary, per se?
>
> my_rule = ( a >> b >> c ) | ( d >> e >> f ) ;
>
> Unless those groupings require additional operators, like Optional (-), let's say.
>
> my_rule = ( a >> b >> c ) | ( d >> -( e >> f ) ) ;
>
> Thanks!
>
> Cheers,
>
> Michael Powell
>
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