292 lines
8.2 KiB
Ruby
292 lines
8.2 KiB
Ruby
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# frozen_string_literal: true
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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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super()
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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, collector
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visit object
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collector << to_dot
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end
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private
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def visit_Arel_Nodes_Ordering o
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visit_edge o, "expr"
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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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end
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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_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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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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end
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alias :visit_Arel_Nodes_FullOuterJoin :visit_Arel_Nodes_InnerJoin
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alias :visit_Arel_Nodes_OuterJoin :visit_Arel_Nodes_InnerJoin
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alias :visit_Arel_Nodes_RightOuterJoin :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 unary o
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visit_edge o, "expr"
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end
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alias :visit_Arel_Nodes_Group :unary
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alias :visit_Arel_Nodes_Cube :unary
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alias :visit_Arel_Nodes_RollUp :unary
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alias :visit_Arel_Nodes_GroupingSet :unary
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alias :visit_Arel_Nodes_GroupingElement :unary
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alias :visit_Arel_Nodes_Grouping :unary
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alias :visit_Arel_Nodes_Having :unary
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alias :visit_Arel_Nodes_Limit :unary
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alias :visit_Arel_Nodes_Not :unary
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alias :visit_Arel_Nodes_Offset :unary
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alias :visit_Arel_Nodes_On :unary
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alias :visit_Arel_Nodes_Top :unary
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alias :visit_Arel_Nodes_UnqualifiedColumn :unary
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alias :visit_Arel_Nodes_Preceding :unary
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alias :visit_Arel_Nodes_Following :unary
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alias :visit_Arel_Nodes_Rows :unary
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alias :visit_Arel_Nodes_Range :unary
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def window o
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visit_edge o, "partitions"
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visit_edge o, "orders"
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visit_edge o, "framing"
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end
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alias :visit_Arel_Nodes_Window :window
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def named_window o
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visit_edge o, "partitions"
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visit_edge o, "orders"
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visit_edge o, "framing"
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visit_edge o, "name"
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end
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alias :visit_Arel_Nodes_NamedWindow :named_window
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def function o
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visit_edge o, "expressions"
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visit_edge o, "distinct"
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visit_edge o, "alias"
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end
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alias :visit_Arel_Nodes_Exists :function
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alias :visit_Arel_Nodes_Min :function
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alias :visit_Arel_Nodes_Max :function
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alias :visit_Arel_Nodes_Avg :function
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alias :visit_Arel_Nodes_Sum :function
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def extract 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_Extract :extract
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def visit_Arel_Nodes_NamedFunction o
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visit_edge o, "name"
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visit_edge o, "expressions"
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visit_edge o, "distinct"
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visit_edge o, "alias"
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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, "source"
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visit_edge o, "projections"
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visit_edge o, "wheres"
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visit_edge o, "windows"
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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_Nodes_Casted o
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visit_edge o, 'val'
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visit_edge o, 'attribute'
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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 nary o
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o.children.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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alias :visit_Arel_Nodes_And :nary
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def binary 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_As :binary
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alias :visit_Arel_Nodes_Assignment :binary
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alias :visit_Arel_Nodes_Between :binary
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alias :visit_Arel_Nodes_Concat :binary
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alias :visit_Arel_Nodes_DoesNotMatch :binary
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alias :visit_Arel_Nodes_Equality :binary
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alias :visit_Arel_Nodes_GreaterThan :binary
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alias :visit_Arel_Nodes_GreaterThanOrEqual :binary
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alias :visit_Arel_Nodes_In :binary
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alias :visit_Arel_Nodes_JoinSource :binary
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alias :visit_Arel_Nodes_LessThan :binary
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alias :visit_Arel_Nodes_LessThanOrEqual :binary
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alias :visit_Arel_Nodes_Matches :binary
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alias :visit_Arel_Nodes_NotEqual :binary
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alias :visit_Arel_Nodes_NotIn :binary
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alias :visit_Arel_Nodes_Or :binary
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alias :visit_Arel_Nodes_Over :binary
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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_Integer :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_Arel_Nodes_BindParam o; end
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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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alias :visit_Set :visit_Array
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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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