Re: [Pyparsing] Combine problem

[Sebastian S. <ssc...@gm...>]

Thanks a lot for the quick replies!!

I didn't know about the , adjacent=False) argument for Combine.

['float3tan:TEXCOORD5;'] wasn't really what I expected but I was simply
confused by the exception - thanks for the explanations!

Nice work in the  "Under development" section too :)


All the best,

seb



On Thu, Jun 11, 2009 at 1:09 PM, spir <den...@fr...> wrote:

> Le Thu, 11 Jun 2009 12:00:32 +0900,
> Sebastian Schoellhammer <ssc...@gm...> s'exprima ainsi:
>
> > Hello there!
> >
> > This is my first post to this list - first of all thanks for this awesome
> > module, I could not live without it these days!
> >
> >
> > My goal is to parse the following structure:
> > s = """
> > struct VS_OUTPUT {
> >     float4 pos        : SV_Position;
> >     float2 UV    : TEXCOORD0;
> >     float3 vVec    : TEXCOORD1;
> >     float3 lVec    : TEXCOORD2;
> >     float3 nor     : TEXCOORD3;
> >     float4 col     : TEXCOORD4;
> >     float3 tan     : TEXCOORD5;
> >     float4 lpos     : TEXCOORD6;
> >     float depth     : TEXCOORD7;
> >     float2 dof     : TEXCOORD8;
> >     float2 VelocityUV      : TEXCOORD9;
> > };"""
> >
> > entryString = "float3 tan     : TEXCOORD5;"
> >
> > def readStruct(s):
> >     header = Literal("struct VS_OUTPUT")+"{"
> >
> >     regs = Combine("TEXCOORD"+Word(nums)) | "SV_Position"
> >     vType = Combine("float"+Optional(Word(nums)))
> >     entry = vType+Word(alphanums)+":"+regs+";"
> >     struct = header + OneOrMore(entry) + "};"
> >
> >     print entry.parseString(entryString)
> >
> > This is working as is - but when i change
> >
> > entry = vType+Word(alphanums)+":"+regs+";"  to entry =
> > Combine(vType+Word(alphanums)+":"+regs+";")
> >
> > to make this into a single string, I get a parse Exception - it's not a
> big
> > problem but I just don't understand why it doesn't work in this case :)
> > Somehow I can't see the difference to where I use Combine in the lines
> > above, where it seems just fine.
>
> You should always post error messages to get help people help you. In this
> case:
>  [.............]
>  File
> "/usr/lib/python2.5/site-packages/pyparsing-1.5.1-py2.5.egg/pyparsing.py",
> line 1657, in parseImpl
>    raise exc
> pyparsing.ParseException: Expected W:(abcd...) (at char 6), (line:1, col:7)
>
> In other words: pyparsing steps on the space, expecting the second part of
> the pattern.
>
> If I remember well, Combine() invalidates the default "separator-skipping"
> mode of pyparsing (someone confirms?). Which is rather sensible, for
> otherwise it would join together bit that are separated in the source, which
> is probably not what we want in most cases.
>
> If you wish this anyway, just join the result manually:
>        result = entry.parseString(entryString)
>        print "".join(result)
> or rather set a post-parse action on entry:
>        entry.setParseAction(lambda node: ''.join(node))
> ==>
> ['float3tan:TEXCOORD5;']
>
> Is this really what you expect?
>
> Denis
> ------
> la vita e estrany
>
>
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-- 
Sebastian Schoellhammer

Sr. Technical Artist
Square Enix LTD
www.square-enix.com