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90 lines
3.2 KiB
90 lines
3.2 KiB
#-- copyright
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# OpenProject is an open source project management software.
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# Copyright (C) 2012-2020 the OpenProject GmbH
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See docs/COPYRIGHT.rdoc for more details.
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#++
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require 'set'
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module Report::InheritedAttribute
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include Report::QueryUtils
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def inherited_attribute(*attributes)
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options = attributes.extract_options!
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list = options[:list]
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merge = options.include?(:merge) ? options[:merge] : options[:list]
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default = options[:default]
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uniq = options[:uniq]
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map = options[:map] || proc { |e| e }
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default ||= [] if list
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attributes.each do |name|
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define_singleton_method(name) do |*values|
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# FIXME: I'm ugly
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return get_inherited_attribute(name, default, list, uniq) if values.empty?
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if list
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old = instance_variable_get("@#{name}") if merge
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old ||= []
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return set_inherited_attribute(name, values.map(&map) + old)
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end
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raise ArgumentError, "wrong number of arguments (#{values.size} for 1)" if values.size > 1
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set_inherited_attribute name, map.call(values.first)
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end
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define_method(name) { |*values| self.class.send(name, *values) }
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end
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end
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def define_singleton_method(name, &block)
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singleton_class.send :attr_writer, name
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singleton_class.class_eval { define_method(name, &block) }
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define_method(name) { instance_variable_get("@#{name}") or singleton_class.send(name) }
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end
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def get_inherited_attribute(name, default = nil, list = false, uniq = false)
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return get_inherited_attribute(name, default, list, false).uniq if list and uniq
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result = instance_variable_get("@#{name}")
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super_result = superclass.get_inherited_attribute(name, default, list) if inherit? name
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if result.nil?
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super_result || default
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else
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list && super_result ? result + super_result : result
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end
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end
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def inherit?(name)
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superclass.respond_to? :get_inherited_attribute and not not_inherited.include? name
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end
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def not_inherited
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@not_inherited ||= Set.new
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end
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def dont_inherit(*attributes)
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not_inherited.merge attributes
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end
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def set_inherited_attribute(name, value)
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instance_variable_set "@#{name}", value
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end
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end
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