Re: [ANN] RE/flex 0.9.18 - a Flex-like lexical analyzer generator for C++

On 2017-03-28, C BergstrC6m <cbergstrom@pathscale.com> wrote:
> Cool!
>
> Is this meant as a flex drop-in replacement? iirc (we) PathScale have
> sent patches to upstream Flex before and I don't remember if they were
> responsive or not. If you are 1:1 compatible, have you tried to
> replace the system flex and rebuild world or how extensively has this
> been validated? You may find the BSD community to be interested and
> empathetic if it can help them.


A nice feature in Flex might be parametrized named regexes:


You know how we can define


    ALF [A-Z]+


and later use


    {ALF}


?


OK; now what if we could have us some params:


    FOO{X} [0-9]{X}+#


then:


    {FOO Z} /* expands to [0-9](Z)+# */


Thumbs up? Down?






Multiple params def:


    FOO{X Y Z} ... {X} ... {Y}+{Z}


Multiple params ref:


    {FOO [^x] . {ALF}}


Cheers ...
[You could whip that up in an hour as a preprocessor to flex, you know. -John]

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