[Pyparsing] Combine problem

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

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.

Maybe I'm missing something really simple.. thanks for looking!

seb

-- 
Sebastian Schoellhammer

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