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module Vedeu
# During the conversion of a Vedeu::Char object into a string of escape
# sequences, this class removes multiple occurences of the same escape
# sequence, resulting in a smaller payload being sent to the renderer.
#
class Compressor
# @param output [Array<Array<Vedeu::Char>>]
# @return [String]
def self.render(output)
new(output).render
end
# Returns a new instance of Vedeu::Compressor.
#
# @param output [Array<Array<Vedeu::Char>>]
# @return [Vedeu::Compressor]
def initialize(output)
@output = output
@colour = ''
@style = ''
end
# @note
# Takes approximately ~25ms for 2100 chars. (2015-07-25)
# @return [String]
def render
if Vedeu::Configuration.compression?
compress
else
uncompress
end
end
protected
# @!attribute [r] output
# @return [Array<Array<Vedeu::Char>>]
attr_reader :output
private
# @return [String]
def compress
out = ''
Array(output).flatten.each do |char|
out << char.position.to_s
out << colour_for(char)
out << style_for(char)
out << char.value
end
out
end
# @return [String]
def uncompress
out = ''
Array(output).flatten.each { |char| out << char.to_s }
out
end
# @param char [Vedeu::Char]
# @return [String]
def colour_for(char)
return '' if char.colour == @colour
@colour = char.colour
@colour.to_s
end
# @param char [Vedeu::Char]
# @return [String]
def style_for(char)
return '' if char.style == @style
@style = char.style
@style.to_s
end
end # Compressor
end # Vedeu
Version data entries
10 entries across 10 versions & 1 rubygems