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#!/usr/bin/env python3
# This script extracts the VPlan digraphs from the vectoriser debug messages
# and saves them in individual dot files (one for each plan). Optionally, and
# providing 'dot' is installed, it can also render the dot into a PNG file.
from __future__ import print_function
import sys
import re
import argparse
import shutil
import subprocess
parser = argparse.ArgumentParser()
parser.add_argument("--png", action="store_true")
args = parser.parse_args()
dot = shutil.which("dot")
if args.png and not dot:
raise RuntimeError("Can't export to PNG without 'dot' in the system")
pattern = re.compile(r"(digraph VPlan {.*?\n})", re.DOTALL)
matches = re.findall(pattern, sys.stdin.read())
for vplan in matches:
m = re.search("graph \[.+(VF=.+,UF.+)", vplan)
if not m:
raise ValueError("Can't get the right VPlan name")
name = re.sub("[^a-zA-Z0-9]", "", m.group(1))
if args.png:
filename = "VPlan" + name + ".png"
print("Exporting " + name + " to PNG via dot: " + filename)
p = subprocess.Popen(
[dot, "-Tpng", "-o", filename],
encoding="utf-8",
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
out, err = p.communicate(input=vplan)
if err:
raise RuntimeError("Error running dot: " + err)
else:
filename = "VPlan" + name + ".dot"
print("Exporting " + name + " to DOT: " + filename)
with open(filename, "w") as out:
out.write(vplan)
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