Oops,that was intended off list... All the same, catch me in a couple of weeks
if I have not sent the code.
EBo
Sent from my Android phone on T-Mobile. America’s first nationwide 4G network.
----- Reply message -----
From: "[email protected]" <[email protected]>
To: "EMC developers" <[email protected]>
Subject: [Emc-developers] rs274ngc bison/flex parser {was: question on gcode
parsing}
Date: Sun, Feb 5, 2012 3:10 am
I'm in the middle of a move and will only have sporatic email access for the
next week. Also, i do not have ready access to those files.
Could you give me a poke in a week or two?
EBo
Sent from my Android phone on T-Mobile. America’s first nationwide 4G network.
----- Reply message -----
From: "Michael Haberler" <[email protected]>
To: "EBo" <[email protected]>
Subject: [Emc-developers] rs274ngc bison/flex parser {was: question on gcode
parsing}
Date: Sat, Feb 4, 2012 12:00 pm
Hi Ebo,
the more I look into it the more Spirit looks interesting to me. Would you mail
me your example?
regards
-Michael
Am 01.02.2012 um 10:58 schrieb EBo:
> If it is of any interest I could send you an experimental parser I
> wrote a decade ago that uses Sprit++ (a C++ template tool, part of
> Boost.org now, which replaces bison and flex, and reads like EBNF). At
> that time I was experimenting with runtime polymorphic parsers (which
> would allow you to overload the language description and support
> different interpretations of the rs274*...
>
> EBo --
>
> On Wed, 1 Feb 2012 00:10:04 +0100, Michael Haberler wrote:
>> [I guess this better belongs here]
>>
>> ok, while this wonderful discussion was raging on, I built a working
>> parser for the current linuxcnc dialect, as an experiment in
>> feasability (this is NOT an end-user tool!)
>>
>>
>> http://git.mah.priv.at/gitweb/emc2-dev.git/shortlog/refs/heads/parser-v2-dev
>>
>> - Michael
>>
>> ps: I'd appreciate feedback from language geeks wrt to removing
>> shift/reduce conflicts.
>>
>> -------------- src/emc/parser-v2/README: --------
>>
>> RS274NGC parser based on Bison/Flex
>> ===================================
>>
>> usage:
>>
>> parser [options] ngcfile ...
>>
>> example:
>> $ parser emc2-dev/nc_files/*.ngc
>>
>> no output means good news (parse ok)
>> other that that, no actions - this is an experiment to find out
>> wether this is feasible
>>
>> options are:
>> -v: create listing with interspersed error messages
>> -s: trace scanning
>> -p: trace parsing
>>
>> I'd be grateful for hints how to remove the remaining shift/reduce
>> conflicts in the grammar. I guess there's something wrong/missing
>> with
>> operator precedence and/or associativity.
>>
>> Error messages
>> --------------
>> There are no custom error messages yet. All error messages are
>> autogenerated from the parser, and derived from the grammar,
>> including
>> the set of permitted tokens, which is already quite reasonable:
>>
>> $ parser -v emc2-dev/src/emc/parser-v2/ngc/foo.txt
>>
>> ...
>> #<bar> = [EXISTS[23
>> -----------------^^
>> ngc/foo.txt:8:unexpected integer, expecting #
>> ...
>> m73.1
>> ---^^
>> ngc/foo.txt:18:unexpected real, expecting one of: <<EOF>> EOL ^ @ %
>> if while break do repeat sub endsub return call # G-code M-code A B C
>> D E F H I J K L P Q R S T U V W X Y Z
>> ...
>> N3242 G10 x[1
>>
>> ^
>> ngc/foo.txt:24:unexpected EOL, expecting one of: ] EQ NE GT GE LT LE
>> and or xor + - * / mod pow
>> ...
>> N3242 G10 x[1]]
>> --------------^
>> ngc/foo.txt:25:unexpected ], expecting one of: <<EOF>> EOL ^ @ % if
>> while break do repeat sub endsub return call # G-code M-code A B C D
>> E
>> F H I J K L P Q R S T U V W X Y Z
>> ..
>> 4 error(s)
>>
>> Error recovery:
>> ---------------
>>
>> currently, on syntax error the parser skips to the next of line, and
>> continues, which seems to work ok.
>>
>> Build notes
>> -----------
>> All files needed to compile are in this branch
>> If you change the grammar: bison 2.5 is needed (Ubuntu 10.04 has
>> 2.4.1 which is too old)
>> I compiled from source - found no backport.
>> Flex: the stock flex coming with 10.04 is fine (flex 2.5.35)
>>
>> Speed is quite good - without spending a thought on optimization and
>> all debug options on, this parser does about 300.000 lines/second on
>> my MBP.
>>
>> added Submakefile
>>
>> base taken from https://idlebox.net/2007/flex-bison-cpp-example/
>> much of that example code is still to be deleted but then this is
>> a proof of concept
>>
>> -mah
>>
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