'''Utility fns for dealing with block .tsv files'''
import math,re

IPAT=re.compile('-?[0-9][0-9]*$')
PPAT=re.compile('[ ,;\[\]]')

Red=''
eRed=''
RedFmt=Red+'%s'+eRed

def intsMaybe(ii):
  return (int(i) for i in ii if IPAT.match(i))

def readHeaders(host,infile,skipColHdrs=True):
    l=infile.readline().rstrip()
    ff=PPAT.split(l)
    (host.nr,host.ox,host.oy,host.oz)=intsMaybe(ff)
    host.et=ff[9]
    l=infile.readline().rstrip()
    (host.orad,host.ymin,host.ymax)=intsMaybe(PPAT.split(l))
    if skipColHdrs:
      _=infile.readline()

def d(p1,p2):
  dx=p1[0]-p2[0]
  dz=p1[1]-p2[1]
  dy=p1[2]-p2[2]
  return math.sqrt((dx*dx)+(dy*dy)+(dz*dz))