mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
233 lines
6.3 KiB
Ruby
233 lines
6.3 KiB
Ruby
module Arel
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module Visitors
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class Dot < Arel::Visitors::Visitor
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class Node # :nodoc:
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attr_accessor :name, :id, :fields
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def initialize name, id, fields = []
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@name = name
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@id = id
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@fields = fields
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end
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end
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class Edge < Struct.new :name, :from, :to # :nodoc:
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end
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def initialize
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@nodes = []
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@edges = []
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@node_stack = []
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@edge_stack = []
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@seen = {}
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end
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def accept object
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super
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to_dot
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end
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private
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def visit_Arel_Nodes_Grouping o
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visit_edge o, "expr"
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end
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def visit_Arel_Nodes_Ordering o
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visit_edge o, "expr"
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visit_edge o, "direction"
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end
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def visit_Arel_Nodes_TableAlias o
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visit_edge o, "name"
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visit_edge o, "relation"
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visit_edge o, "columns"
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end
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def visit_Arel_Nodes_Sum o
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visit_edge o, "expressions"
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visit_edge o, "alias"
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end
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alias :visit_Arel_Nodes_Max :visit_Arel_Nodes_Sum
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alias :visit_Arel_Nodes_Avg :visit_Arel_Nodes_Sum
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def visit_Arel_Nodes_Count o
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visit_edge o, "expressions"
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visit_edge o, "distinct"
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end
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def visit_Arel_Nodes_On o
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visit_edge o, "expr"
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end
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def visit_Arel_Nodes_Values o
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visit_edge o, "expressions"
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end
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def visit_Arel_Nodes_StringJoin o
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visit_edge o, "left"
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visit_edge o, "right"
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end
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def visit_Arel_Nodes_InnerJoin o
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visit_edge o, "left"
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visit_edge o, "right"
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visit_edge o, "constraint"
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end
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alias :visit_Arel_Nodes_OuterJoin :visit_Arel_Nodes_InnerJoin
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def visit_Arel_Nodes_DeleteStatement o
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visit_edge o, "relation"
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visit_edge o, "wheres"
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end
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def visit_Arel_Nodes_UnqualifiedColumn o
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visit_edge o, "attribute"
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end
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def visit_Arel_Nodes_Offset o
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visit_edge o, "value"
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end
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def visit_Arel_Nodes_InsertStatement o
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visit_edge o, "relation"
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visit_edge o, "columns"
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visit_edge o, "values"
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end
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def visit_Arel_Nodes_SelectCore o
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visit_edge o, "froms"
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visit_edge o, "projections"
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visit_edge o, "wheres"
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end
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def visit_Arel_Nodes_SelectStatement o
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visit_edge o, "cores"
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visit_edge o, "limit"
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visit_edge o, "orders"
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visit_edge o, "offset"
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end
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def visit_Arel_Nodes_UpdateStatement o
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visit_edge o, "relation"
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visit_edge o, "wheres"
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visit_edge o, "values"
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end
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def visit_Arel_Table o
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visit_edge o, "name"
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end
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def visit_Arel_Attribute o
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visit_edge o, "relation"
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visit_edge o, "name"
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end
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alias :visit_Arel_Attributes_Integer :visit_Arel_Attribute
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alias :visit_Arel_Attributes_Float :visit_Arel_Attribute
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alias :visit_Arel_Attributes_String :visit_Arel_Attribute
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alias :visit_Arel_Attributes_Time :visit_Arel_Attribute
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alias :visit_Arel_Attributes_Boolean :visit_Arel_Attribute
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alias :visit_Arel_Attributes_Attribute :visit_Arel_Attribute
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def visit_Arel_Nodes_Equality o
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visit_edge o, "left"
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visit_edge o, "right"
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end
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alias :visit_Arel_Nodes_And :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_Or :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_NotEqual :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_GreaterThan :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_GreaterThanOrEqual :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_Assignment :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_In :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_LessThan :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_LessThanOrEqual :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_Between :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_NotIn :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_DoesNotMatch :visit_Arel_Nodes_Equality
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alias :visit_Arel_Nodes_Matches :visit_Arel_Nodes_Equality
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def visit_String o
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@node_stack.last.fields << o
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end
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alias :visit_Time :visit_String
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alias :visit_Date :visit_String
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alias :visit_DateTime :visit_String
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alias :visit_NilClass :visit_String
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alias :visit_TrueClass :visit_String
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alias :visit_FalseClass :visit_String
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alias :visit_Arel_SqlLiteral :visit_String
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alias :visit_Fixnum :visit_String
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alias :visit_BigDecimal :visit_String
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alias :visit_Float :visit_String
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alias :visit_Symbol :visit_String
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alias :visit_Arel_Nodes_SqlLiteral :visit_String
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def visit_Hash o
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o.each_with_index do |pair, i|
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edge("pair_#{i}") { visit pair }
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end
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end
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def visit_Array o
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o.each_with_index do |x,i|
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edge(i) { visit x }
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end
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end
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def visit_edge o, method
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edge(method) { visit o.send(method) }
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end
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def visit o
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if node = @seen[o.object_id]
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@edge_stack.last.to = node
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return
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end
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node = Node.new(o.class.name, o.object_id)
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@seen[node.id] = node
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@nodes << node
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with_node node do
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super
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end
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end
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def edge name
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edge = Edge.new(name, @node_stack.last)
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@edge_stack.push edge
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@edges << edge
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yield
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@edge_stack.pop
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end
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def with_node node
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if edge = @edge_stack.last
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edge.to = node
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end
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@node_stack.push node
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yield
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@node_stack.pop
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end
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def quote string
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string.to_s.gsub('"', '\"')
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end
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def to_dot
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"digraph \"ARel\" {\nnode [width=0.375,height=0.25,shape=record];\n" +
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@nodes.map { |node|
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label = "<f0>#{node.name}"
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node.fields.each_with_index do |field, i|
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label << "|<f#{i + 1}>#{quote field}"
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end
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"#{node.id} [label=\"#{label}\"];"
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}.join("\n") + "\n" + @edges.map { |edge|
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"#{edge.from.id} -> #{edge.to.id} [label=\"#{edge.name}\"];"
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}.join("\n") + "\n}"
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end
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end
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end
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end
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