Re: Strength of sequence vs alternative parsers

On Wed, Dec 6, 2017 at 10:21 AM, Mikael Asplund <[email protected]> wrote:
> Not basically... excatly. Spirit is pure C++, just (ab)using operator overload to construct parsers.

Why not? Leverage what's there. Good stuff.

>   /Mikael

Cheers,

Michael

> -----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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