read 3d ob positions from txml in python and output them as json for easier use in e.g. web clients

getpositions.py

from xml.etree.ElementTree import ElementTree
import xml.etree.ElementTree as ET

import sys

if len(sys.argv) != 2:
    print "Giev filename!"
    sys.exit(1)


t = ElementTree()
s = t.parse(sys.argv[1])
ents = s.getiterator("entity")

def attrval(el, attrname):
    attr = el.find(".//attribute[@name='%s']" % attrname)
    return attr.attrib['value']

def floatlist(el, attrname):
    return [float(v) for v in attrval(el, attrname).split(',')]

def conv(coords):
    a, b, c = coords
    return list((a, b, -c))

posses = []
idx2pos = {}
for e in ents:
    n = e.find("component[@type='EC_Name']")
    name = attrval(n, "name")
    idx = int(name.split('_')[-1])

    p = e.find("component[@type='EC_Placeable']")
    tr = floatlist(p, "Transform")
    pos = tr[:3]
    
    idx2pos[idx] = pos

keys = idx2pos.keys()
keys.sort()

posses = [conv(idx2pos[k]) for k in keys]


print posses