49 lines
1.4 KiB
Ruby
49 lines
1.4 KiB
Ruby
#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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#
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class Class
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def fields(*fields)
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module_eval {
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def initialize(*args, &block)
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args = init_fields(*args)
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if respond_to? :init
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init(*args) {|*a| yield(*a)}
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elsif args.any?
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raise ArgumentError, "extra arguments: #{args.inspect}"
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end
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end
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}
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vars = fields.map {|f| :"@#{f.to_s().chomp("?")}"}
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define_method(:init_fields) {|*args|
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vars.each {|v|
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instance_variable_set(v, args.shift())
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}
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args
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}
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vars.each_index {|i|
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define_method(fields[i]) {
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instance_variable_get(vars[i])
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}
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}
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end
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end
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