Differential D18622 Diff 52199 google/googletest/dist/googletest/scripts/gen_gtest_pred_impl.py

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google/googletest/dist/googletest/scripts/gen_gtest_pred_impl.py

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				#!/usr/bin/env python
				#
				# Copyright 2006, Google Inc.
				# 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.
				# * Neither the name of Google Inc. nor the names of its
				# contributors may 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
				# OWNER 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.

				"""gen_gtest_pred_impl.py v0.1

				Generates the implementation of Google Test predicate assertions and
				accompanying tests.

				Usage:

				gen_gtest_pred_impl.py MAX_ARITY

				where MAX_ARITY is a positive integer.

				The command generates the implementation of up-to MAX_ARITY-ary
				predicate assertions, and writes it to file gtest_pred_impl.h in the
				directory where the script is. It also generates the accompanying
				unit test in file gtest_pred_impl_unittest.cc.
				"""

				__author__ = 'wan@google.com (Zhanyong Wan)'

				import os
				import sys
				import time

				# Where this script is.
				SCRIPT_DIR = os.path.dirname(sys.argv[0])

				# Where to store the generated header.
				HEADER = os.path.join(SCRIPT_DIR, '../include/gtest/gtest_pred_impl.h')

				# Where to store the generated unit test.
				UNIT_TEST = os.path.join(SCRIPT_DIR, '../test/gtest_pred_impl_unittest.cc')


				def HeaderPreamble(n):
				"""Returns the preamble for the header file.

				Args:
				n: the maximum arity of the predicate macros to be generated.
				"""

				# A map that defines the values used in the preamble template.
				DEFS = {
				'today' : time.strftime('%m/%d/%Y'),
				'year' : time.strftime('%Y'),
				'command' : '%s %s' % (os.path.basename(sys.argv[0]), n),
				'n' : n
				}

				return (
				"""// Copyright 2006, Google Inc.
				// 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.
				// * Neither the name of Google Inc. nor the names of its
				// contributors may 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
				// OWNER 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.

				// This file is AUTOMATICALLY GENERATED on %(today)s by command
				// '%(command)s'. DO NOT EDIT BY HAND!
				//
				// Implements a family of generic predicate assertion macros.

				#ifndef GTEST_INCLUDE_GTEST_GTEST_PRED_IMPL_H_
				#define GTEST_INCLUDE_GTEST_GTEST_PRED_IMPL_H_

				#include "gtest/gtest.h"

				namespace testing {

				// This header implements a family of generic predicate assertion
				// macros:
				//
				// ASSERT_PRED_FORMAT1(pred_format, v1)
				// ASSERT_PRED_FORMAT2(pred_format, v1, v2)
				// ...
				//
				// where pred_format is a function or functor that takes n (in the
				// case of ASSERT_PRED_FORMATn) values and their source expression
				// text, and returns a testing::AssertionResult. See the definition
				// of ASSERT_EQ in gtest.h for an example.
				//
				// If you don't care about formatting, you can use the more
				// restrictive version:
				//
				// ASSERT_PRED1(pred, v1)
				// ASSERT_PRED2(pred, v1, v2)
				// ...
				//
				// where pred is an n-ary function or functor that returns bool,
				// and the values v1, v2, ..., must support the << operator for
				// streaming to std::ostream.
				//
				// We also define the EXPECT_* variations.
				//
				// For now we only support predicates whose arity is at most %(n)s.
				// Please email googletestframework@googlegroups.com if you need
				// support for higher arities.

				// GTEST_ASSERT_ is the basic statement to which all of the assertions
				// in this file reduce. Don't use this in your code.

				#define GTEST_ASSERT_(expression, on_failure) \\
				GTEST_AMBIGUOUS_ELSE_BLOCKER_ \\
				if (const ::testing::AssertionResult gtest_ar = (expression)) \\
				; \\
				else \\
				on_failure(gtest_ar.failure_message())
				""" % DEFS)


				def Arity(n):
				"""Returns the English name of the given arity."""

				if n < 0:
				return None
				elif n <= 3:
				return ['nullary', 'unary', 'binary', 'ternary'][n]
				else:
				return '%s-ary' % n


				def Title(word):
				"""Returns the given word in title case. The difference between
				this and string's title() method is that Title('4-ary') is '4-ary'
				while '4-ary'.title() is '4-Ary'."""

				return word[0].upper() + word[1:]


				def OneTo(n):
				"""Returns the list [1, 2, 3, ..., n]."""

				return range(1, n + 1)


				def Iter(n, format, sep=''):
				"""Given a positive integer n, a format string that contains 0 or
				more '%s' format specs, and optionally a separator string, returns
				the join of n strings, each formatted with the format string on an
				iterator ranged from 1 to n.

				Example:

				Iter(3, 'v%s', sep=', ') returns 'v1, v2, v3'.
				"""

				# How many '%s' specs are in format?
				spec_count = len(format.split('%s')) - 1
				return sep.join([format % (spec_count * (i,)) for i in OneTo(n)])


				def ImplementationForArity(n):
				"""Returns the implementation of n-ary predicate assertions."""

				# A map the defines the values used in the implementation template.
				DEFS = {
				'n' : str(n),
				'vs' : Iter(n, 'v%s', sep=', '),
				'vts' : Iter(n, '#v%s', sep=', '),
				'arity' : Arity(n),
				'Arity' : Title(Arity(n))
				}

				impl = """

				// Helper function for implementing {EXPECT\|ASSERT}_PRED%(n)s. Don't use
				// this in your code.
				template <typename Pred""" % DEFS

				impl += Iter(n, """,
				typename T%s""")

				impl += """>
				AssertionResult AssertPred%(n)sHelper(const char* pred_text""" % DEFS

				impl += Iter(n, """,
				const char* e%s""")

				impl += """,
				Pred pred"""

				impl += Iter(n, """,
				const T%s& v%s""")

				impl += """) {
				if (pred(%(vs)s)) return AssertionSuccess();

				""" % DEFS

				impl += ' return AssertionFailure() << pred_text << "("'

				impl += Iter(n, """
				<< e%s""", sep=' << ", "')

				impl += ' << ") evaluates to false, where"'

				impl += Iter(n, """
				<< "\\n" << e%s << " evaluates to " << v%s""")

				impl += """;
				}

				// Internal macro for implementing {EXPECT\|ASSERT}_PRED_FORMAT%(n)s.
				// Don't use this in your code.
				#define GTEST_PRED_FORMAT%(n)s_(pred_format, %(vs)s, on_failure)\\
				GTEST_ASSERT_(pred_format(%(vts)s, %(vs)s), \\
				on_failure)

				// Internal macro for implementing {EXPECT\|ASSERT}_PRED%(n)s. Don't use
				// this in your code.
				#define GTEST_PRED%(n)s_(pred, %(vs)s, on_failure)\\
				GTEST_ASSERT_(::testing::AssertPred%(n)sHelper(#pred""" % DEFS

				impl += Iter(n, """, \\
				#v%s""")

				impl += """, \\
				pred"""

				impl += Iter(n, """, \\
				v%s""")

				impl += """), on_failure)

				// %(Arity)s predicate assertion macros.
				#define EXPECT_PRED_FORMAT%(n)s(pred_format, %(vs)s) \\
				GTEST_PRED_FORMAT%(n)s_(pred_format, %(vs)s, GTEST_NONFATAL_FAILURE_)
				#define EXPECT_PRED%(n)s(pred, %(vs)s) \\
				GTEST_PRED%(n)s_(pred, %(vs)s, GTEST_NONFATAL_FAILURE_)
				#define ASSERT_PRED_FORMAT%(n)s(pred_format, %(vs)s) \\
				GTEST_PRED_FORMAT%(n)s_(pred_format, %(vs)s, GTEST_FATAL_FAILURE_)
				#define ASSERT_PRED%(n)s(pred, %(vs)s) \\
				GTEST_PRED%(n)s_(pred, %(vs)s, GTEST_FATAL_FAILURE_)

				""" % DEFS

				return impl


				def HeaderPostamble():
				"""Returns the postamble for the header file."""

				return """

				} // namespace testing

				#endif // GTEST_INCLUDE_GTEST_GTEST_PRED_IMPL_H_
				"""


				def GenerateFile(path, content):
				"""Given a file path and a content string
				overwrites it with the given content.
				"""
				print 'Updating file %s . . .' % path
				f = file(path, 'w+')
				print >>f, content,
				f.close()

				print 'File %s has been updated.' % path


				def GenerateHeader(n):
				"""Given the maximum arity n, updates the header file that implements
				the predicate assertions.
				"""
				GenerateFile(HEADER,
				HeaderPreamble(n)
				+ ''.join([ImplementationForArity(i) for i in OneTo(n)])
				+ HeaderPostamble())


				def UnitTestPreamble():
				"""Returns the preamble for the unit test file."""

				# A map that defines the values used in the preamble template.
				DEFS = {
				'today' : time.strftime('%m/%d/%Y'),
				'year' : time.strftime('%Y'),
				'command' : '%s %s' % (os.path.basename(sys.argv[0]), sys.argv[1]),
				}

				return (
				"""// Copyright 2006, Google Inc.
				// 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.
				// * Neither the name of Google Inc. nor the names of its
				// contributors may 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
				// OWNER 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.

				// This file is AUTOMATICALLY GENERATED on %(today)s by command
				// '%(command)s'. DO NOT EDIT BY HAND!

				// Regression test for gtest_pred_impl.h
				//
				// This file is generated by a script and quite long. If you intend to
				// learn how Google Test works by reading its unit tests, read
				// gtest_unittest.cc instead.
				//
				// This is intended as a regression test for the Google Test predicate
				// assertions. We compile it as part of the gtest_unittest target
				// only to keep the implementation tidy and compact, as it is quite
				// involved to set up the stage for testing Google Test using Google
				// Test itself.
				//
				// Currently, gtest_unittest takes ~11 seconds to run in the testing
				// daemon. In the future, if it grows too large and needs much more
				// time to finish, we should consider separating this file into a
				// stand-alone regression test.

				#include <iostream>

				#include "gtest/gtest.h"
				#include "gtest/gtest-spi.h"

				// A user-defined data type.
				struct Bool {
				explicit Bool(int val) : value(val != 0) {}

				bool operator>(int n) const { return value > Bool(n).value; }

				Bool operator+(const Bool& rhs) const { return Bool(value + rhs.value); }

				bool operator==(const Bool& rhs) const { return value == rhs.value; }

				bool value;
				};

				// Enables Bool to be used in assertions.
				std::ostream& operator<<(std::ostream& os, const Bool& x) {
				return os << (x.value ? "true" : "false");
				}

				""" % DEFS)


				def TestsForArity(n):
				"""Returns the tests for n-ary predicate assertions."""

				# A map that defines the values used in the template for the tests.
				DEFS = {
				'n' : n,
				'es' : Iter(n, 'e%s', sep=', '),
				'vs' : Iter(n, 'v%s', sep=', '),
				'vts' : Iter(n, '#v%s', sep=', '),
				'tvs' : Iter(n, 'T%s v%s', sep=', '),
				'int_vs' : Iter(n, 'int v%s', sep=', '),
				'Bool_vs' : Iter(n, 'Bool v%s', sep=', '),
				'types' : Iter(n, 'typename T%s', sep=', '),
				'v_sum' : Iter(n, 'v%s', sep=' + '),
				'arity' : Arity(n),
				'Arity' : Title(Arity(n)),
				}

				tests = (
				"""// Sample functions/functors for testing %(arity)s predicate assertions.

				// A %(arity)s predicate function.
				template <%(types)s>
				bool PredFunction%(n)s(%(tvs)s) {
				return %(v_sum)s > 0;
				}

				// The following two functions are needed to circumvent a bug in
				// gcc 2.95.3, which sometimes has problem with the above template
				// function.
				bool PredFunction%(n)sInt(%(int_vs)s) {
				return %(v_sum)s > 0;
				}
				bool PredFunction%(n)sBool(%(Bool_vs)s) {
				return %(v_sum)s > 0;
				}
				""" % DEFS)

				tests += """
				// A %(arity)s predicate functor.
				struct PredFunctor%(n)s {
				template <%(types)s>
				bool operator()(""" % DEFS

				tests += Iter(n, 'const T%s& v%s', sep=""",
				""")

				tests += """) {
				return %(v_sum)s > 0;
				}
				};
				""" % DEFS

				tests += """
				// A %(arity)s predicate-formatter function.
				template <%(types)s>
				testing::AssertionResult PredFormatFunction%(n)s(""" % DEFS

				tests += Iter(n, 'const char* e%s', sep=""",
				""")

				tests += Iter(n, """,
				const T%s& v%s""")

				tests += """) {
				if (PredFunction%(n)s(%(vs)s))
				return testing::AssertionSuccess();

				return testing::AssertionFailure()
				<< """ % DEFS

				tests += Iter(n, 'e%s', sep=' << " + " << ')

				tests += """
				<< " is expected to be positive, but evaluates to "
				<< %(v_sum)s << ".";
				}
				""" % DEFS

				tests += """
				// A %(arity)s predicate-formatter functor.
				struct PredFormatFunctor%(n)s {
				template <%(types)s>
				testing::AssertionResult operator()(""" % DEFS

				tests += Iter(n, 'const char* e%s', sep=""",
				""")

				tests += Iter(n, """,
				const T%s& v%s""")

				tests += """) const {
				return PredFormatFunction%(n)s(%(es)s, %(vs)s);
				}
				};
				""" % DEFS

				tests += """
				// Tests for {EXPECT\|ASSERT}_PRED_FORMAT%(n)s.

				class Predicate%(n)sTest : public testing::Test {
				protected:
				virtual void SetUp() {
				expected_to_finish_ = true;
				finished_ = false;""" % DEFS

				tests += """
				""" + Iter(n, 'n%s_ = ') + """0;
				}
				"""

				tests += """
				virtual void TearDown() {
				// Verifies that each of the predicate's arguments was evaluated
				// exactly once."""

				tests += ''.join(["""
				EXPECT_EQ(1, n%s_) <<
				"The predicate assertion didn't evaluate argument %s "
				"exactly once.";""" % (i, i + 1) for i in OneTo(n)])

				tests += """

				// Verifies that the control flow in the test function is expected.
				if (expected_to_finish_ && !finished_) {
				FAIL() << "The predicate assertion unexpactedly aborted the test.";
				} else if (!expected_to_finish_ && finished_) {
				FAIL() << "The failed predicate assertion didn't abort the test "
				"as expected.";
				}
				}

				// true iff the test function is expected to run to finish.
				static bool expected_to_finish_;

				// true iff the test function did run to finish.
				static bool finished_;
				""" % DEFS

				tests += Iter(n, """
				static int n%s_;""")

				tests += """
				};

				bool Predicate%(n)sTest::expected_to_finish_;
				bool Predicate%(n)sTest::finished_;
				""" % DEFS

				tests += Iter(n, """int Predicate%%(n)sTest::n%s_;
				""") % DEFS

				tests += """
				typedef Predicate%(n)sTest EXPECT_PRED_FORMAT%(n)sTest;
				typedef Predicate%(n)sTest ASSERT_PRED_FORMAT%(n)sTest;
				typedef Predicate%(n)sTest EXPECT_PRED%(n)sTest;
				typedef Predicate%(n)sTest ASSERT_PRED%(n)sTest;
				""" % DEFS

				def GenTest(use_format, use_assert, expect_failure,
				use_functor, use_user_type):
				"""Returns the test for a predicate assertion macro.

				Args:
				use_format: true iff the assertion is a _PRED_FORMAT.
				use_assert: true iff the assertion is a ASSERT_*.
				expect_failure: true iff the assertion is expected to fail.
				use_functor: true iff the first argument of the assertion is
				a functor (as opposed to a function)
				use_user_type: true iff the predicate functor/function takes
				argument(s) of a user-defined type.

				Example:

				GenTest(1, 0, 0, 1, 0) returns a test that tests the behavior
				of a successful EXPECT_PRED_FORMATn() that takes a functor
				whose arguments have built-in types."""

				if use_assert:
				assrt = 'ASSERT' # 'assert' is reserved, so we cannot use
				# that identifier here.
				else:
				assrt = 'EXPECT'

				assertion = assrt + '_PRED'

				if use_format:
				pred_format = 'PredFormat'
				assertion += '_FORMAT'
				else:
				pred_format = 'Pred'

				assertion += '%(n)s' % DEFS

				if use_functor:
				pred_format_type = 'functor'
				pred_format += 'Functor%(n)s()'
				else:
				pred_format_type = 'function'
				pred_format += 'Function%(n)s'
				if not use_format:
				if use_user_type:
				pred_format += 'Bool'
				else:
				pred_format += 'Int'

				test_name = pred_format_type.title()

				if use_user_type:
				arg_type = 'user-defined type (Bool)'
				test_name += 'OnUserType'
				if expect_failure:
				arg = 'Bool(n%s_++)'
				else:
				arg = 'Bool(++n%s_)'
				else:
				arg_type = 'built-in type (int)'
				test_name += 'OnBuiltInType'
				if expect_failure:
				arg = 'n%s_++'
				else:
				arg = '++n%s_'

				if expect_failure:
				successful_or_failed = 'failed'
				expected_or_not = 'expected.'
				test_name += 'Failure'
				else:
				successful_or_failed = 'successful'
				expected_or_not = 'UNEXPECTED!'
				test_name += 'Success'

				# A map that defines the values used in the test template.
				defs = DEFS.copy()
				defs.update({
				'assert' : assrt,
				'assertion' : assertion,
				'test_name' : test_name,
				'pf_type' : pred_format_type,
				'pf' : pred_format,
				'arg_type' : arg_type,
				'arg' : arg,
				'successful' : successful_or_failed,
				'expected' : expected_or_not,
				})

				test = """
				// Tests a %(successful)s %(assertion)s where the
				// predicate-formatter is a %(pf_type)s on a %(arg_type)s.
				TEST_F(%(assertion)sTest, %(test_name)s) {""" % defs

				indent = (len(assertion) + 3)*' '
				extra_indent = ''

				if expect_failure:
				extra_indent = ' '
				if use_assert:
				test += """
				expected_to_finish_ = false;
				EXPECT_FATAL_FAILURE({ // NOLINT"""
				else:
				test += """
				EXPECT_NONFATAL_FAILURE({ // NOLINT"""

				test += '\n' + extra_indent + """ %(assertion)s(%(pf)s""" % defs

				test = test % defs
				test += Iter(n, ',\n' + indent + extra_indent + '%(arg)s' % defs)
				test += ');\n' + extra_indent + ' finished_ = true;\n'

				if expect_failure:
				test += ' }, "");\n'

				test += '}\n'
				return test

				# Generates tests for all 2**6 = 64 combinations.
				tests += ''.join([GenTest(use_format, use_assert, expect_failure,
				use_functor, use_user_type)
				for use_format in [0, 1]
				for use_assert in [0, 1]
				for expect_failure in [0, 1]
				for use_functor in [0, 1]
				for use_user_type in [0, 1]
				])

				return tests


				def UnitTestPostamble():
				"""Returns the postamble for the tests."""

				return ''


				def GenerateUnitTest(n):
				"""Returns the tests for up-to n-ary predicate assertions."""

				GenerateFile(UNIT_TEST,
				UnitTestPreamble()
				+ ''.join([TestsForArity(i) for i in OneTo(n)])
				+ UnitTestPostamble())


				def _Main():
				"""The entry point of the script. Generates the header file and its
				unit test."""

				if len(sys.argv) != 2:
				print __doc__
				print 'Author: ' + __author__
				sys.exit(1)

				n = int(sys.argv[1])
				GenerateHeader(n)
				GenerateUnitTest(n)


				if __name__ == '__main__':
				_Main()