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module Psych
###
# Psych::Stream is a streaming YAML emitter. It will not buffer your YAML,
# but send it straight to an IO.
#
# Here is an example use:
#
# stream = Psych::Stream.new($stdout)
# stream.start
# stream.push({:foo => 'bar'})
# stream.finish
#
# YAML will be immediately emitted to $stdout with no buffering.
#
# Psych::Stream#start will take a block and ensure that Psych::Stream#finish
# is called, so you can do this form:
#
# stream = Psych::Stream.new($stdout)
# stream.start do |em|
# em.push(:foo => 'bar')
# end
#
class Stream < Psych::Visitors::YAMLTree
class Emitter < Psych::Emitter # :nodoc:
def end_document implicit_end = !streaming?
super
end
def streaming?
true
end
end
###
# Create a new streaming emitter. Emitter will print to +io+. See
# Psych::Stream for an example.
def initialize io
super({}, Emitter.new(io))
end
###
# Start streaming using +encoding+
def start encoding = Nodes::Stream::UTF8
super.tap { yield self if block_given? }
ensure
finish if block_given?
end
private
def register target, obj
end
end
end
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