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							'''
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							searx is free software: you can redistribute it and/or modify
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							it under the terms of the GNU Affero General Public License as published by
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							the Free Software Foundation, either version 3 of the License, or
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							(at your option) any later version.
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							searx 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
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							GNU Affero General Public License for more details.
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							You should have received a copy of the GNU Affero General Public License
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							along with searx. If not, see < http://www.gnu.org/licenses/ >.
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							(C) 2017- by Alexandre Flament, <alex@al-f.net>
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							'''
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							class SearxException(Exception):
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							    pass
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							class SearxParameterException(SearxException):
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							    def __init__(self, name, value):
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							        if value == '' or value is None:
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							            message = 'Empty ' + name + ' parameter'
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							        else:
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							            message = 'Invalid value "' + value + '" for parameter ' + name
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							        super(SearxParameterException, self).__init__(message)
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							        self.message = message
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							        self.parameter_name = name
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							        self.parameter_value = value
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