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module Psych
###
# If an object defines +encode_with+, then an instance of Psych::Coder will
# be passed to the method when the object is being serialized. The Coder
# automatically assumes a Psych::Nodes::Mapping is being emitted. Other
# objects like Sequence and Scalar may be emitted if +seq=+ or +scalar=+ are
# called, respectively.
class Coder
attr_accessor :tag, :style, :implicit, :object
attr_reader :type, :seq
def initialize tag
@map = {}
@seq = []
@implicit = false
@type = :map
@tag = tag
@style = Psych::Nodes::Mapping::BLOCK
@scalar = nil
@object = nil
end
def scalar *args
if args.length > 0
warn "#{caller[0]}: Coder#scalar(a,b,c) is deprecated" if $VERBOSE
@tag, @scalar, _ = args
@type = :scalar
end
@scalar
end
# Emit a map. The coder will be yielded to the block.
def map tag = @tag, style = @style
@tag = tag
@style = style
yield self if block_given?
@map
end
# Emit a scalar with +value+ and +tag+
def represent_scalar tag, value
self.tag = tag
self.scalar = value
end
# Emit a sequence with +list+ and +tag+
def represent_seq tag, list
@tag = tag
self.seq = list
end
# Emit a sequence with +map+ and +tag+
def represent_map tag, map
@tag = tag
self.map = map
end
# Emit an arbitrary object +obj+ and +tag+
def represent_object tag, obj
@tag = tag
@type = :object
@object = obj
end
# Emit a scalar with +value+
def scalar= value
@type = :scalar
@scalar = value
end
# Emit a map with +value+
def map= map
@type = :map
@map = map
end
def []= k, v
@type = :map
@map[k] = v
end
alias :add :[]=
def [] k
@type = :map
@map[k]
end
# Emit a sequence of +list+
def seq= list
@type = :seq
@seq = list
end
end
end