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#!/usr/bin/env python
"""Convert a file containing a mix of python code and content into content.
Write the input file to stdout. Python code included between blocks
``!! PYON`` and ``!! PYOFF`` is executed and the output emitted.
"""
# Copyright (c) 2011-2020, Daniele Varrazzo <daniele.varrazzo@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * The name of Daniele Varrazzo may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import sys
import six
def convert(f):
mode = 'out' # can be 'out' or 'py'
script = []
env = {}
while 1:
line = f.readline()
if not line: break
if line.startswith("!#"):
# a comment
continue
if not line.startswith("!!"):
# a regular line
if mode == 'out':
sys.stdout.write(line)
elif mode == 'py':
script.append(line)
else:
raise ValueError("unexpected mode: %s" % mode)
continue
# state change
if 'PYON' in line and mode == 'out':
del script[:]
mode = 'py'
elif 'PYOFF' in line and mode == 'py':
script.insert(0, 'from __future__ import print_function\n')
six.exec_(''.join(script), env)
mode = 'out'
else:
raise ValueError("bad line in mode %s: %s"
% (mode, line.rstrip()))
if __name__ == '__main__':
if len(sys.argv) > 2:
print >>sys.stderr, "usage: %s [FILE]" % sys.argv[1]
sys.exit(2)
f = len(sys.argv) == 2 and open(sys.argv[1]) or sys.stdin
convert(f)
sys.exit(0)
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