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([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)
49