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vendor/rdtool-0.6.33/lib/rd/document-struct.rb

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module RD

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  # DocumentStructure defines and restricts structure of document tree.

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  # it consists of ElementRelationship

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  class DocumentStructure

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    def initialize

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      @relationships = []

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    end

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    def add_relationships(*relations)

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      @relationships += relations

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    end

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    def define_relationship(parent, child)

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      add_relationships(ElementRelationship.new(parent, child))

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    end

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    def each_relationship

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      @relationships.each do |i|

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        yield(i)

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      end

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    end

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    def is_valid?(parent, child)

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      each_relationship do |i|

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        return true if i.match?(parent, child)

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      end

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      false

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    end

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  end

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  # ElementRelationship is knowledge about parent-children relationship

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  # between Elements.

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  class ElementRelationship

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    attr_reader(:parent, :child)

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    def initialize(parent, child)

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      @parent = parent

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      @child = child

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    end

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    def match?(parent, child)

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      parent.is_a? @parent and child.is_a? @child

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    end

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  end

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end

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