82 lines
1.7 KiB
Ruby
82 lines
1.7 KiB
Ruby
# We transform objects into a tree of nodes
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module Sof
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#abstract base class for nodes in the tree
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class Node
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# must be able to output to a stream
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def out io ,level
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raise "abstract #{self}"
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end
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end
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class SimpleNode < Node
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def initialize data
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@data = data
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end
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attr_accessor :data
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def out io , level
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io.write(data)
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end
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end
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class ArrayNode < Node
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def initialize
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@children = []
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end
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attr_reader :children
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def add c
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@children << c
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end
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def out io , level = 0
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indent = " " * level
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@children.each_with_index do |child , i|
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io.write "\n#{indent}" unless i == 0
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io.write "-"
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child.out(io , level + 1)
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end
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end
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end
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class ObjectNode < Node
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def initialize data
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@data = data
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@children = []
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end
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attr_reader :children
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attr_accessor :data
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def add k , v
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@children << [k,v]
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end
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def out io , level = 0
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io.write(@data)
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indent = " " * (level + 1)
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@children.each_with_index do |child , i|
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k , v = child
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io.write "\n#{indent}"
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k.out(io , level + 2)
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io.write " "
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v.out(io , level + 2)
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end
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end
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end
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class HashNode < Node
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def initialize
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@children = []
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end
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attr_reader :children
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def add key , val
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@children << [key,val]
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end
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def out io , level = 0
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indent = " " * level
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@children.each_with_index do |child , i|
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key , val = child
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io.write "\n#{indent}" unless i == 0
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io.write "-"
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key.out(io , level + 1)
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io.write ": "
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val.out(io , level + 1)
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end
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end
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end
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end
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