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require 'strscan'
require 'benchmark'
require 'thread'
class Scanner < StringScanner
def initialize code
super code
end
def tokenize encoder = Tokens.new
scan_tokens encoder
encoder
end
protected
def scan_tokens encoder
until eos?
if matched = scan(/ +/)
encoder.text_token matched, :space
elsif matched = scan(/\n/)
encoder.text_token matched, :space
elsif matched = scan(/!/)
encoder.text_token matched, :not_going_to_happen
elsif matched = scan(/=/) #/
encoder.text_token matched, :not_going_to_happen
elsif matched = scan(/%/)
encoder.text_token matched, :not_going_to_happen
elsif matched = scan(/\d+/)
encoder.text_token matched, :number
elsif matched = scan(/\w+/)
encoder.text_token matched, :word
elsif matched = scan(/[,.]/)
encoder.text_token matched, :op
elsif scan(/\(/)
encoder.begin_group :par
elsif scan(/\)/)
encoder.end_group :par
else
raise
end
end
end
end
class Tokens < Array
alias token push
alias text_token push
alias block_token push
def begin_group kind; push :begin_group, kind end
def end_group kind; push :end_group, kind end
end
class Encoder
def setup
@out = ''
@opened = []
end
def finish
@out
end
def encode scanner
setup
scanner.tokenize self
finish
end
# def token content, kind
# if content.is_a? ::String
# text_token content, kind
# elsif content.is_a? ::Symbol
# block_token content, kind
# else
# raise 'Unknown token content type: %p' % [content]
# end
# end
def text_token text, kind
# @out <<
# if kind == :space
# text
# else
# text.gsub!(/[)\\]/, '\\\\\0') # escape ) and \
# "#{kind}(#{text})"
# end
end
# def block_token action, kind
# case action
# when :begin_group
# begin_group kind
# when :end_group
# end_group kind
# else
# raise
# end
# end
def begin_group kind
# @opened << kind
# @out << "#{kind}<"
end
def end_group kind
# @opened.pop
# @out << '>'
end
end
size = ((ARGV.first || 1).to_f * 1_000_000).to_i # size
# generate string
code = "2011 alpha, beta, (gamma), delta.\n"
code *= (size.to_f / code.size).ceil
code.slice! size..-1
slice_size = (ARGV[1] || 100).to_i
N = 1
100.times do
out = Encoder.new.encode(Scanner.new(code))
end
1000.times do
2.times do
threads = []
seconds = Benchmark.realtime do N.times do
chunk_offsets = [0]
code.lines.each_slice slice_size do |lines|
chunk_offsets << chunk_offsets.last + lines.join.bytesize
end
threads.clear
chunk_offsets.each_cons(2) do |this_chunk, next_chunk|
threads << Thread.new do
Thread.current[:out] = Encoder.new.encode Scanner.new(code[this_chunk...next_chunk])
end
end
threads.each(&:join)
out = threads.map { |t| t[:out] }.join
end end
mb = N * size / 1_000_000.0
puts 'Multi-Threaded: %0.1f MB in %0.2fs = %0.1f MB/s @ %d threads' % [mb, seconds, mb / seconds, threads.size]
end
2.times do
seconds = Benchmark.realtime do N.times do
out = Encoder.new.encode(Scanner.new(code))
end end
mb = N * size / 1_000_000.0
puts 'Single-Threaded: %0.1f MB in %0.2fs = %0.1f MB/s' % [mb, seconds, mb / seconds]
end
end
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