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#!/usr/bin/env python3
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#
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# Copyright (C) 2021 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see
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# <http://www.gnu.org/licenses/>.
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# About:
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# When provided with an interface file, this script outputs a new interface
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# file, where all original interfaces are enclosed in an ifndef statement
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# dependent on their name. All indentation inside the interface file should
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# be converted to tabs before running this script.
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#
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# Known issues:
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# - interface already enclosed in an ifndef statement is not ignored
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# - "`" and "'" inside comments are not ignored
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# - \t is always used for indentation - may result in mixture of spaces and tabs
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import sys
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import os
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import re
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if len(sys.argv) < 1:
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print(("Usage: {} <policy>.if > <output>.if").format(sys.argv[0]), file=sys.stderr)
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exit(os.EX_USAGE)
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# ending index of interface
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end = 0
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with open(sys.argv[1], 'r') as f:
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interfaces = f.read()
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file_len = len(interfaces)
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while end < file_len:
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start = interfaces.find("interface(`", end)
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if start < 0:
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#no more interfaces
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print(interfaces[end:], end ="")
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break
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name_end = interfaces.find("'", start+11)
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name = interfaces[start+11:name_end]
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# locate the end of the interface - i.e. ending apostrophe
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reg = re.compile(r"[`']")
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# skip the ' after interface name
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i = name_end+1
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# counter for the depth (` opens a new block, while ' closes it)
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graves = 0
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while i < file_len:
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match = reg.search(interfaces, i)
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if not match:
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print("Malformed interface: {}".format(name), file=sys.stderr)
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exit(1)
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i = match.end()
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if match.group(0) == '`':
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graves += 1
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else:
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graves -= 1
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if graves == 0:
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break
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# keep everything between the end of previous interface and start of a new one
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print(interfaces[end:start], end ="")
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# interface ends in "')" -- add 1 for the edning bracket
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end = i+1
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# print the whole interface enclosed in "ifndef"
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print("ifndef(`{}',`".format(name))
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print('\n'.join([('\t' + x) if x else x for x in interfaces[start:end].split('\n')]))
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print("')", end ="")
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