utils/extract_vplan.py

   1 #!/usr/bin/env python
   2
   3 # This script extracts the VPlan digraphs from the vectoriser debug messages
   4 # and saves them in individual dot files (one for each plan). Optionally, and
   5 # providing 'dot' is installed, it can also render the dot into a PNG file.
   6
   7 from __future__ import print_function
   8
   9 import sys
  10 import re
  11 import argparse
  12 import shutil
  13 import subprocess
  14
  15 parser = argparse.ArgumentParser()
  16 parser.add_argument('--png', action='store_true')
  17 args = parser.parse_args()
  18
  19 dot = shutil.which('dot')
  20 if args.png and not dot:
  21     raise RuntimeError("Can't export to PNG without 'dot' in the system")
  22
  23 pattern = re.compile(r"(digraph VPlan {.*?\n})",re.DOTALL)
  24 matches = re.findall(pattern, sys.stdin.read())
  25
  26 for vplan in matches:
  27     m = re.search("graph \[.+(VF=.+,UF.+), ", vplan)
  28     if not m:
  29         raise ValueError("Can't get the right VPlan name")
  30     name = re.sub('[^a-zA-Z0-9]', '', m.group(1))
  31
  32     if args.png:
  33         filename = 'VPlan' + name + '.png'
  34         print("Exporting " + name + " to PNG via dot: " + filename)
  35         p = subprocess.Popen([dot, '-Tpng', '-o', filename],
  36                               encoding='utf-8',
  37                               stdin=subprocess.PIPE,
  38                               stdout=subprocess.PIPE,
  39                               stderr=subprocess.PIPE)
  40         out, err = p.communicate(input=vplan)
  41         if err:
  42             raise RuntimeError("Error running dot: " + err)
  43
  44     else:
  45         filename = 'VPlan' + name + '.dot'
  46         print("Exporting " + name + " to DOT: " + filename)
  47         with open(filename, 'w') as out:
  48             out.write(vplan)