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# Copyright 2016 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Graphviz documentation converter library."""
import fileinput
import re
import subprocess
import sys
class DotConverter(object):
"""Converts dot graphs to SVG format inline."""
def __init__(self, dot_command, dot_env):
self.dot_command = dot_command
self.dot_env = dot_env
def convert(self):
collect = False
graph = b""
block_num = 0
for line in fileinput.input():
if re.search(r"div class='graphviz dot'><!--", line):
collect = True
continue
elif collect and re.search(r"--></div>", line):
dot = subprocess.Popen(
self.dot_command,
stdin=subprocess.PIPE, stdout=subprocess.PIPE, env=self.dot_env)
output = dot.communicate(graph)[0].decode()
if dot.returncode == 0:
# cut the first few lines (svg header + comments)
sys.stdout.write(output.split("\n", 6)[6])
else:
sys.stderr.write("inlining block %d failed.\n" % (block_num + 1))
collect = False
graph = b""
block_num += 1
continue
if collect:
graph += str.encode(line)
else:
sys.stdout.write(line)
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