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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(/\s+/)
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
while kind = @opened.pop
close kind
end
@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
N = (5 ** (ARGV.first || 8).to_i)
code = (1..N).map { |n| "#{n} alpha, beta, (gamma).\n" }.join
slice_size = (ARGV[1] || 100).to_i
3.times do
time = Benchmark.realtime do
threads = []
code.lines.each_slice slice_size do |lines|
threads << Thread.new do
Thread.current[:out] = Encoder.new.encode(Scanner.new(lines.inject(&:+)))
end
end
threads.each(&:join)
out = threads.map { |t| t[:out] }.join
end
puts 'Multi-Threaded: %0.2fs -- %0.0f kTok/s' % [time, (N * 11 + 1) / time / 1000]
end
3.times do
time = Benchmark.realtime do
out = Encoder.new.encode(Scanner.new(code))
end
puts 'Current: %0.2fs -- %0.0f kTok/s' % [time, (N * 11 + 1) / time / 1000]
end
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