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module CodeRay
module Encoders
# A Filter encoder has another Tokens instance as output.
# It can be subclass to select, remove, or modify tokens in the stream.
#
# Subclasses of Filter are called "Filters" and can be chained.
#
# == Options
#
# === :tokens
#
# The Tokens object which will receive the output.
#
# Default: Tokens.new
#
# See also: TokenKindFilter
class Filter < Encoder
register_for :filter
protected
def setup options
@out = options[:tokens] || Tokens.new
end
public
def text_token text, kind # :nodoc:
@out.text_token text, kind
end
def begin_group kind # :nodoc:
@out.begin_group kind
end
def begin_line kind # :nodoc:
@out.begin_line kind
end
def end_group kind # :nodoc:
@out.end_group kind
end
def end_line kind # :nodoc:
@out.end_line kind
end
end
end
end
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