89 lines
3.3 KiB
Ruby
89 lines
3.3 KiB
Ruby
module Sof
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# this function writes the object (and all reachable objects) out as sof
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# and returns a string
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# For trees or graphs this works best by handing roots
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# Internally this is done in three steps:
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# - All reachable objects are collected, these are called Occurences and the Members class does
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# the collecting. Members holds a hash of occurences
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# - A tree of nodes is created from the occurences. Different node classes for different classes
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# - The nodes are witten to a steam
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def self.write object
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writer = Writer.new(Members.new(object) )
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writer.write
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end
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# The writer does the coordinating work of the stages (see write function)
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class Writer
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include Util
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# Initialized with the Members (hash of occurences, see there)
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def initialize members
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@members = members
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end
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# main function, creates nodes from the occurences and writes the nodes to a string
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# returns the sof formatted string for all objects
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def write
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node = to_sof_node(@members.root , 0)
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io = StringIO.new
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node.out( io , 0 )
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io.string
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end
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# create a Node (subclass) for an object at a given level.
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# Level is mainly needed for the indenting
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# from the object we get the Occurence and decide wether a reference node is needed
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# simple objects (with more inner structure) become SimpleNodes
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# Any structured object bocomes a ObjectNode
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# Hash and Array create their own nodes via to_sof_node functions on the classes
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def to_sof_node(object , level)
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if is_value?(object)
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return SimpleNode.new(object.to_sof())
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end
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occurence = @members.objects[object.object_id]
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raise "no object #{object}" unless occurence
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#puts "#{level} ? #{occurence.level} : ref #{occurence.referenced}"
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if( occurence.referenced and (occurence.level <= level) )
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#puts "ref #{occurence.referenced} level #{level} at #{occurence.level}"
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if( occurence.written.nil? )
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occurence.written = true
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else
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return SimpleNode.new("*#{occurence.referenced}")
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end
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end
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ref = occurence.referenced
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if(object.respond_to? :to_sof_node) #mainly meant for arrays and hashes
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object.to_sof_node(self , level , ref )
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else
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object_sof_node(object , level , ref )
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end
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end
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# create an object node from the object
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# simple nodes are returned for small objects
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# small means only simple attributes and only 30 chars of them
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# object nodes are basically arrays (see there)
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def object_sof_node( object , level , ref)
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if( object.is_a? Class )
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return SimpleNode.new( object.name , ref )
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end
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head = object.class.name + "("
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atts = {}
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attributes_for(object).each() do |a|
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val = get_value(object , a)
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next if val.nil?
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atts[a] = to_sof_node(val , level + 1)
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end
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immediate , extended = atts.partition {|a,val| val.is_a?(SimpleNode) }
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head += immediate.collect {|a,val| "#{a.to_sof()} => #{val.as_string(level)}"}.join(", ") + ")"
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return SimpleNode.new(head) if( ref.nil? and extended.empty? and head.length < 30 )
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node = ObjectNode.new(head , ref)
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extended.each do |a , val|
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node.add( to_sof_node(a,level + 1) , val )
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end
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node
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end
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end
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end
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