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require 'strscan'
require 'benchmark'
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(/\w+/)
encoder.text_token matched, :word
elsif matched = scan(/[,.]/)
encoder.text_token matched, :op
elsif scan(/\(/)
encoder.open :par
elsif scan(/\)/)
encoder.close :par
else
raise
end
end
end
end
class Tokens < Array
alias token push
alias text_token push
alias block_token push
def open kind; push :open, kind end
def close kind; push :close, kind end
end
class Encoder
def setup
@out = ''
@opened = []
end
def finish
while kind = @opened.pop
close kind
end
@out
end
def encode_tokens tokens
setup
compile tokens
finish
end
def encode_stream 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 :open
open kind
when :close
close kind
else
raise
end
end
def open kind
@opened << kind
@out << "#{kind}<"
end
def close kind
@opened.pop
@out << '>'
end
protected
def compile tokens
content = nil
for item in tokens
if content
case content
when ::String
text_token content, item
content = nil
when :open
open item
content = nil
when :close
close item
content = nil
when ::Symbol
block_token content, kind
content = nil
else
raise
end
else
content = item
end
end
raise if content
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 / 2 / time_scanning / 1000]
time_encoding = Benchmark.realtime do
encoder.encode_tokens tokens
end
puts 'Encoding: %0.2fs -- %0.0f kTok/s' % [time_encoding, tokens.size / 2 / time_encoding / 1000]
time = time_scanning + time_encoding
puts 'Together: %0.2fs -- %0.0f kTok/s' % [time, tokens.size / 2 / time / 1000]
scanner.reset
time = Benchmark.realtime do
encoder.encode_stream scanner
end
puts 'Scanning + Encoding: %0.2fs -- %0.0f kTok/s' % [time, (N * 11 + 1) / time / 1000]
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