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 7from __future__ import print_function 8 9import sys 10import re 11import argparse 12import shutil 13import subprocess 14 15parser = argparse.ArgumentParser() 16parser.add_argument("--png", action="store_true") 17args = parser.parse_args() 18 19dot = shutil.which("dot") 20if args.png and not dot: 21 raise RuntimeError("Can't export to PNG without 'dot' in the system") 22 23pattern = re.compile(r"(digraph VPlan {.*?\n})", re.DOTALL) 24matches = re.findall(pattern, sys.stdin.read()) 25 26for 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( 36 [dot, "-Tpng", "-o", filename], 37 encoding="utf-8", 38 stdin=subprocess.PIPE, 39 stdout=subprocess.PIPE, 40 stderr=subprocess.PIPE, 41 ) 42 out, err = p.communicate(input=vplan) 43 if err: 44 raise RuntimeError("Error running dot: " + err) 45 46 else: 47 filename = "VPlan" + name + ".dot" 48 print("Exporting " + name + " to DOT: " + filename) 49 with open(filename, "w") as out: 50 out.write(vplan) 51