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require 'strscan'
require 'benchmark'
class Scanner < StringScanner
def initialize code
super code
@tokens = Tokens.new
end
def tokenize
scan_tokens @tokens
@tokens
end
protected
def scan_tokens tokens
until eos?
if matched = scan(/\s+/)
tokens << [matched, :space]
elsif matched = scan(/!/)
tokens << [matched, :not_going_to_happen]
elsif matched = scan(/=/) #/
tokens << [matched, :not_going_to_happen]
elsif matched = scan(/%/)
tokens << [matched, :not_going_to_happen]
elsif matched = scan(/\w+/)
tokens << [matched, :word]
elsif matched = scan(/[,.]/)
tokens << [matched, :op]
elsif scan(/\(/)
tokens << [:open, :par]
elsif scan(/\)/)
tokens << [:close, :par]
else
raise
end
end
end
end
class Tokens < Array
end
class Encoder
def encode_tokens tokens
@out = ''
compile tokens
@out
end
protected
if RUBY_VERSION >= '1.9' || defined?(JRUBY_VERSION)
def compile tokens
for text, kind in tokens
token text, kind
end
end
else
def compile tokens
tokens.each(&method(:token).to_proc)
end
end
def token content, kind
encoded_token =
case content
when ::String
text_token content, kind
when :open
open kind
when :close
close kind
when ::Symbol
block_token content, kind
else
raise 'Unknown token content type: %p' % [content]
end
@out << encoded_token
end
def text_token text, kind
if kind == :space
text
else
text.gsub!(/[)\\]/, '\\\\\0') # escape ) and \
"#{kind}(#{text})"
end
end
def block_token action, kind
case action
when :open
open kind
when :close
close kind
end
end
def open kind
"#{kind}<"
end
def close kind
'>'
end
end
N = (10 ** (ARGV.first || 5).to_i)
code = " alpha, beta, (gamma).\n" * N
scanner = Scanner.new code
encoder = Encoder.new
tokens = nil
time_scanning = Benchmark.realtime do
tokens = scanner.tokenize
end
puts 'Scanning: %0.2fs -- %0.0f kTok/s' % [time_scanning, tokens.size / time_scanning / 1000]
time_encoding = Benchmark.realtime do
out = encoder.encode_tokens(tokens).size
end
puts 'Encoding: %0.2fs -- %0.0f kTok/s' % [time_encoding, tokens.size / time_encoding / 1000]
time = time_scanning + time_encoding
puts 'Together: %0.2fs -- %0.0f kTok/s' % [time, tokens.size / time / 1000]
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