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Contents
module Alf
class Renderer
module InstanceMethods
# Default renderer options
DEFAULT_OPTIONS = {}
# Renderer input (typically an Iterator)
attr_accessor :input
# @return [Environment] Optional wired environment
attr_accessor :environment
# @return [Hash] Renderer's options
attr_accessor :options
# Creates a reader instance.
#
# @param [Iterator] iterator an Iterator of tuples to render
# @param [Environment] environment wired environment, serving this reader
# @param [Hash] options Reader's options (see doc of subclasses)
def initialize(*args)
@input, @environment, @options = case args.first
when Array
Tools.varargs(args, [Array, Environment, Hash])
else
Tools.varargs(args, [Iterator, Environment, Hash])
end
@options = self.class.const_get(:DEFAULT_OPTIONS).merge(@options || {})
end
# Executes the rendering, outputting the resulting tuples on the provided
# output buffer.
#
# The default implementation simply coerces the input as an Iterator and
# delegates the call to {#render}.
def execute(output = $stdout)
render(Iterator.coerce(input, environment), output)
end
protected
# Renders tuples served by the iterator to the output buffer provided and
# returns the latter.
#
# This method must be implemented by subclasses unless {#execute} is
# overriden.
def render(iterator, output)
end
undef :render
end # module InstanceMethods
include InstanceMethods
end # class Renderer
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems