Reading Formatted Text File

[Kevin McBrearty]

Hello All,

I'm trying to read a formatted text of strings and
floats. I have looked through previous posts and
couldn't deciper a good method. I'm new to python so
any suggestions would be helpful.

Regards,
Kevin

solid SIMPLEBLOCK
facet normal 0.000000e+00 0.000000e+00 -1.000000e+00
outer loop
vertex 1.000000e+00 -1.000000e+00 0.000000e+00
vertex -1.000000e+00 -1.000000e+00 0.000000e+00
vertex -1.000000e+00 1.000000e+00 0.000000e+00
endloop
endfacet



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[Kent Johnson]

Re: Reading Formatted Text File

Kevin McBrearty wrote:[color=blue]
> Hello All,
>
> I'm trying to read a formatted text of strings and
> floats. I have looked through previous posts and
> couldn't deciper a good method. I'm new to python so
> any suggestions would be helpful.[/color]

Here is a solution using pyparsing (http://pyparsing.sourceforge.net).
The result is a nested list structure containing the original data in a
structured form
blocktype
list of facets
normal vector
list of vertices

Kent


from pyparsing import *
import string

point = Literal( "." )
e = CaselessLiteral ( "E" )
fnumber = Combine( Word( "+-"+nums, nums ) +
Optional( point + Optional( Word( nums ) ) ) +
Optional( e + Word( "+-"+nums, nums ) ) )
fnumber.setPars eAction( lambda s,l,t: [ float(t[0]) ] )

triple = Group(fnumber + fnumber + fnumber)

normal = Suppress('norma l') + triple
vertex = Suppress('verte x') + triple

facet = Suppress('facet ') + normal + Suppress('outer loop') +
Group(OneOrMore (vertex)) + Suppress('endlo op')

blockType = Word(string.upp ercase)

solid = Suppress('solid ') + blockType + Group(OneOrMore (facet))

data = '''
solid SIMPLEBLOCK
facet normal 0.000000e+00 0.000000e+00 -1.000000e+00
outer loop
vertex 1.000000e+00 -1.000000e+00 0.000000e+00
vertex -1.000000e+00 -1.000000e+00 0.000000e+00
vertex -1.000000e+00 1.000000e+00 0.000000e+00
endloop
endfacet
'''

print solid.parseStri ng(data)


prints:
['SIMPLEBLOCK', [[0.0, 0.0, -1.0], [[1.0, -1.0, 0.0], [-1.0, -1.0, 0.0],
[-1.0, 1.0, 0.0]]]]
[color=blue]
>
> Regards,
> Kevin
>
> solid SIMPLEBLOCK
> facet normal 0.000000e+00 0.000000e+00 -1.000000e+00
> outer loop
> vertex 1.000000e+00 -1.000000e+00 0.000000e+00
> vertex -1.000000e+00 -1.000000e+00 0.000000e+00
> vertex -1.000000e+00 1.000000e+00 0.000000e+00
> endloop
> endfacet
>
>
>
> _______________ _______________ ____
> Do you Yahoo!?
> The all-new My Yahoo! - Get yours free!
> http://my.yahoo.com
>
>[/color]