Class: RbYAML::Serializer

Inherits:
Object show all
Defined in:
lib/rbyaml/serializer.rb

Constant Summary collapse

ANCHOR_TEMPLATE = 
"id%03d"

Instance Method Summary collapse

Constructor Details

#initialize(emitter, resolver, explicit_start = nil, explicit_end = nil, version = nil, tags = nil) ⇒ Serializer

Returns a new instance of Serializer.



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# File 'lib/rbyaml/serializer.rb', line 12

def initialize(emitter, resolver, explicit_start=nil, explicit_end=nil, version=nil, tags=nil)
  @emitter = emitter
  @resolver = resolver
  @use_explicit_start = explicit_start
  @use_explicit_end = explicit_end
  @use_version = version
  @use_tags = tags
  @serialized_nodes = {}
  @anchors = {}
  @last_anchor_id = 0
  @closed = nil
end

Instance Method Details

#anchor_node(node) ⇒ Object 



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# File 'lib/rbyaml/serializer.rb', line 60

def anchor_node(node)
  if @anchors.include?(node)
    @anchors[node] ||= generate_anchor(node)
  else
    @anchors[node] = nil
    if SequenceNode === node
      for item in node.value
        anchor_node(item)
      end
    elsif MappingNode === node
      for key,val in node.value
        anchor_node(key)
        anchor_node(val)
      end
    end
  end
end

#close ⇒ Object 



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# File 'lib/rbyaml/serializer.rb', line 36

def close
  if @closed.nil?
    raise SerializerError.new("serializer is not opened")
  elsif !@closed
    @emitter.emit(StreamEndEvent.new)
    @closed = true
  end
end

#generate_anchor(node) ⇒ Object 



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# File 'lib/rbyaml/serializer.rb', line 78

def generate_anchor(node)
  @last_anchor_id += 1
  ANCHOR_TEMPLATE % @last_anchor_id
end

#open ⇒ Object 



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# File 'lib/rbyaml/serializer.rb', line 25

def open
  if @closed.nil?
    @emitter.emit(StreamStartEvent.new)
    @closed = false
  elsif @closed
    raise SerializerError.new("serializer is closed")
  else
    raise SerializerError.new("serializer is already opened")
  end
end

#serialize(node) ⇒ Object 



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# File 'lib/rbyaml/serializer.rb', line 45

def serialize(node)
  if @closed.nil?
    raise SerializerError.new("serializer is not opened")
  elsif @closed
    raise SerializerError.new("serializer is closed")
  end
  @emitter.emit(DocumentStartEvent.new(@use_explicit_start,@use_version,@use_tags))
  anchor_node(node)
  serialize_node(node,nil,nil)
  @emitter.emit(DocumentEndEvent.new(@use_explicit_end))
  @serialized_nodes = {}
  @anchors = {}
  @last_alias_id = 0
end

#serialize_node(node, parent, index) ⇒ Object 



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# File 'lib/rbyaml/serializer.rb', line 83

def serialize_node(node,parent,index)
  talias = @anchors[node]
  if @serialized_nodes.include?(node)
    @emitter.emit(AliasEvent.new(talias))
  else
    @serialized_nodes[node] = true
    @resolver.descend_resolver(parent, index)
    if ScalarNode === node
      detected_tag = @resolver.resolve(ScalarNode, node.value, [true,false])
      default_tag = @resolver.resolve(ScalarNode, node.value, [false,true])
      implicit = (node.tag == detected_tag), (node.tag == default_tag)
      @emitter.emit(ScalarEvent.new(talias, node.tag, implicit, node.value,nil,nil,node.style))
    elsif SequenceNode === node
      implicit = (node.tag == @resolver.resolve(SequenceNode, node.value, true))
      @emitter.emit(SequenceStartEvent.new(talias, node.tag, implicit,node.flow_style))
      index = 0
      for item in node.value
        serialize_node(item,node,index)
        index += 1
      end
      @emitter.emit(SequenceEndEvent.new)
    elsif MappingNode === node
      implicit = (node.tag == @resolver.resolve(MappingNode, node.value, true))
      @emitter.emit(MappingStartEvent.new(talias, node.tag, implicit,node.flow_style))
      for key, value in node.value
        serialize_node(key,node,nil)
        serialize_node(value,node,key)
      end
      @emitter.emit(MappingEndEvent.new)
    end
  end
end