test/shaping/hb_test_tools.py - platform/external/harfbuzz_ng - Git at Google

 #!/usr/bin/python

 import sys, os, re, difflib, unicodedata, errno, cgi
 from itertools import *

 diff_symbols = "-+=*&^%$#@!~/"
 diff_colors = ['red', 'green', 'blue']

 class ColorFormatter:

 	class Null:
 		@staticmethod
 		def start_color (c): return ''
 		@staticmethod
 		def end_color (): return ''
 		@staticmethod
 		def escape (s): return s
 		@staticmethod
 		def newline (): return '\n'

 	class ANSI:
 		@staticmethod
 		def start_color (c):
 			return {
 				'red': '\033[41;37;1m',
 				'green': '\033[42;37;1m',
 				'blue': '\033[44;37;1m',
 			}[c]
 		@staticmethod
 		def end_color ():
 			return '\033[m'
 		@staticmethod
 		def escape (s): return s
 		@staticmethod
 		def newline (): return '\n'

 	class HTML:
 		@staticmethod
 		def start_color (c):
 			return '<span style="background:%s">' % c
 		@staticmethod
 		def end_color ():
 			return '</span>'
 		@staticmethod
 		def escape (s): return cgi.escape (s)
 		@staticmethod
 		def newline (): return '<br/>\n'

 	@staticmethod
 	def Auto (argv = [], out = sys.stdout):
 		format = ColorFormatter.ANSI
 		if "--format" in argv:
 			argv.remove ("--format")
 			format = ColorFormatter.ANSI
 		if "--format=ansi" in argv:
 			argv.remove ("--format=ansi")
 			format = ColorFormatter.ANSI
 		if "--format=html" in argv:
 			argv.remove ("--format=html")
 			format = ColorFormatter.HTML
 		if "--no-format" in argv:
 			argv.remove ("--no-format")
 			format = ColorFormatter.Null
 		return format


 class DiffColorizer:

 	diff_regex = re.compile ('([a-za-z0-9_]*)([^a-za-z0-9_]?)')

 	def __init__ (self, formatter, colors=diff_colors, symbols=diff_symbols):
 		self.formatter = formatter
 		self.colors = colors
 		self.symbols = symbols

 	def colorize_lines (self, lines):
 		lines = (l if l else '' for l in lines)
 		ss = [self.diff_regex.sub (r'\1\n\2\n', l).splitlines (True) for l in lines]
 		oo = ["",""]
 		st = [False, False]
 		for l in difflib.Differ().compare (*ss):
 			if l[0] == '?':
 				continue
 			if l[0] == ' ':
 				for i in range(2):
 					if st[i]:
 						oo[i] += self.formatter.end_color ()
 						st[i] = False
 				oo = [o + self.formatter.escape (l[2:]) for o in oo]
 				continue
 			if l[0] in self.symbols:
 				i = self.symbols.index (l[0])
 				if not st[i]:
 					oo[i] += self.formatter.start_color (self.colors[i])
 					st[i] = True
 				oo[i] += self.formatter.escape (l[2:])
 				continue
 		for i in range(2):
 			if st[i]:
 				oo[i] += self.formatter.end_color ()
 				st[i] = False
 		oo = [o.replace ('\n', '') for o in oo]
 		return [s1+s2+self.formatter.newline () for (s1,s2) in zip (self.symbols, oo) if s2]

 	def colorize_diff (self, f):
 		lines = [None, None]
 		for l in f:
 			if l[0] not in self.symbols:
 				yield self.formatter.escape (l).replace ('\n', self.formatter.newline ())
 				continue
 			i = self.symbols.index (l[0])
 			if lines[i]:
 				# Flush
 				for line in self.colorize_lines (lines):
 					yield line
 				lines = [None, None]
 			lines[i] = l[1:]
 			if (all (lines)):
 				# Flush
 				for line in self.colorize_lines (lines):
 					yield line
 				lines = [None, None]
 		if (any (lines)):
 			# Flush
 			for line in self.colorize_lines (lines):
 				yield line


 class ZipDiffer:

 	@staticmethod
 	def diff_files (files, symbols=diff_symbols):
 		files = tuple (files) # in case it's a generator, copy it
 		try:
 			for lines in izip_longest (*files):
 				if all (lines[0] == line for line in lines[1:]):
 					sys.stdout.writelines ([" ", lines[0]])
 					continue

 				for i, l in enumerate (lines):
 					if l:
 						sys.stdout.writelines ([symbols[i], l])
 		except IOError as e:
 			if e.errno != errno.EPIPE:
 				print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
 				sys.exit (1)


 class DiffFilters:

 	@staticmethod
 	def filter_failures (f):
 		for key, lines in DiffHelpers.separate_test_cases (f):
 			lines = list (lines)
 			if not DiffHelpers.test_passed (lines):
 				for l in lines: yield l

 class Stat:

 	def __init__ (self):
 		self.count = 0
 		self.freq = 0

 	def add (self, test):
 		self.count += 1
 		self.freq += test.freq

 class Stats:

 	def __init__ (self):
 		self.passed = Stat ()
 		self.failed = Stat ()
 		self.total  = Stat ()

 	def add (self, test):
 		self.total.add (test)
 		if test.passed:
 			self.passed.add (test)
 		else:
 			self.failed.add (test)

 	def mean (self):
 		return float (self.passed.count) / self.total.count

 	def variance (self):
 		return (float (self.passed.count) / self.total.count) * \
 		       (float (self.failed.count) / self.total.count)

 	def stddev (self):
 		return self.variance () ** .5

 	def zscore (self, population):
 		"""Calculate the standard score.
 		   Population is the Stats for population.
 		   Self is Stats for sample.
 		   Returns larger absolute value if sample is highly unlikely to be random.
 		   Anything outside of -3..+3 is very unlikely to be random.
 		   See: http://en.wikipedia.org/wiki/Standard_score"""

 		return (self.mean () - population.mean ()) / population.stddev ()


 class DiffSinks:

 	@staticmethod
 	def print_stat (f):
 		passed = 0
 		failed = 0
 		# XXX port to Stats, but that would really slow us down here
 		for key, lines in DiffHelpers.separate_test_cases (f):
 			if DiffHelpers.test_passed (lines):
 				passed += 1
 			else:
 				failed += 1
 		total = passed + failed
 		print "%d out of %d tests passed.  %d failed (%g%%)" % (passed, total, failed, 100. * failed / total)

 	@staticmethod
 	def print_ngrams (f, ns=(1,2,3)):
 		gens = tuple (Ngram.generator (n) for n in ns)
 		allstats = Stats ()
 		allgrams = {}
 		for key, lines in DiffHelpers.separate_test_cases (f):
 			test = Test (lines)
 			allstats.add (test)

 			for gen in gens:
 				for ngram in gen (test.unicodes):
 					if ngram not in allgrams:
 						allgrams[ngram] = Stats ()
 					allgrams[ngram].add (test)

 		importantgrams = {}
 		for ngram, stats in allgrams.iteritems ():
 			if stats.failed.count >= 30: # for statistical reasons
 				importantgrams[ngram] = stats
 		allgrams = importantgrams
 		del importantgrams

 		for ngram, stats in allgrams.iteritems ():
 			print "zscore: %9f failed: %6d passed: %6d ngram: <%s>" % (stats.zscore (allstats), stats.failed.count, stats.passed.count, ','.join ("U+%04X" % u for u in ngram))


 class Test:

 	def __init__ (self, lines):
 		self.freq = 1
 		self.passed = True
 		self.identifier = None
 		self.text = None
 		self.unicodes = None
 		self.glyphs = None
 		for l in lines:
 			symbol = l[0]
 			if symbol != ' ':
 				self.passed = False
 			i = 1
 			if ':' in l:
 				i = l.index (':')
 				if not self.identifier:
 					self.identifier = l[1:i]
 				i = i + 2 # Skip colon and space
 			j = -1
 			if l[j] == '\n':
 				j -= 1
 			brackets = l[i] + l[j]
 			l = l[i+1:-2]
 			if brackets == '()':
 				self.text = l
 			elif brackets == '<>':
 				self.unicodes = Unicode.parse (l)
 			elif brackets == '[]':
 				# XXX we don't handle failed tests here
 				self.glyphs = l


 class DiffHelpers:

 	@staticmethod
 	def separate_test_cases (f):
 		'''Reads lines from f, and if the lines have identifiers, ie.
 		   have a colon character, groups them by identifier,
 		   yielding lists of all lines with the same identifier.'''

 		def identifier (l):
 			if ':' in l[1:]:
 				return l[1:l.index (':')]
 			return l
 		return groupby (f, key=identifier)

 	@staticmethod
 	def test_passed (lines):
 		lines = list (lines)
 		# XXX This is a hack, but does the job for now.
 		if any (l.find("space+0|space+0") >= 0 for l in lines if l[0] == '+'): return True
 		if any (l.find("uni25CC") >= 0 for l in lines if l[0] == '+'): return True
 		if any (l.find("dottedcircle") >= 0 for l in lines if l[0] == '+'): return True
 		if any (l.find("glyph0") >= 0 for l in lines if l[0] == '+'): return True
 		if any (l.find("gid0") >= 0 for l in lines if l[0] == '+'): return True
 		if any (l.find("notdef") >= 0 for l in lines if l[0] == '+'): return True
 		return all (l[0] == ' ' for l in lines)


 class FilterHelpers:

 	@staticmethod
 	def filter_printer_function (filter_callback):
 		def printer (f):
 			for line in filter_callback (f):
 				print line
 		return printer

 	@staticmethod
 	def filter_printer_function_no_newline (filter_callback):
 		def printer (f):
 			for line in filter_callback (f):
 				sys.stdout.writelines ([line])
 		return printer


 class Ngram:

 	@staticmethod
 	def generator (n):

 		def gen (f):
 			l = []
 			for x in f:
 				l.append (x)
 				if len (l) == n:
 					yield tuple (l)
 					l[:1] = []

 		gen.n = n
 		return gen


 class UtilMains:

 	@staticmethod
 	def process_multiple_files (callback, mnemonic = "FILE"):

 		if "--help" in sys.argv:
 			print "Usage: %s %s..." % (sys.argv[0], mnemonic)
 			sys.exit (1)

 		try:
 			files = sys.argv[1:] if len (sys.argv) > 1 else ['-']
 			for s in files:
 				callback (FileHelpers.open_file_or_stdin (s))
 		except IOError as e:
 			if e.errno != errno.EPIPE:
 				print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
 				sys.exit (1)

 	@staticmethod
 	def process_multiple_args (callback, mnemonic):

 		if len (sys.argv) == 1 or "--help" in sys.argv:
 			print "Usage: %s %s..." % (sys.argv[0], mnemonic)
 			sys.exit (1)

 		try:
 			for s in sys.argv[1:]:
 				callback (s)
 		except IOError as e:
 			if e.errno != errno.EPIPE:
 				print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
 				sys.exit (1)

 	@staticmethod
 	def filter_multiple_strings_or_stdin (callback, mnemonic, \
 					      separator = " ", \
 					      concat_separator = False):

 		if "--help" in sys.argv:
 			print "Usage:\n  %s %s...\nor:\n  %s\n\nWhen called with no arguments, input is read from standard input." \
 			      % (sys.argv[0], mnemonic, sys.argv[0])
 			sys.exit (1)

 		try:
 			if len (sys.argv) == 1:
 				while (1):
 					line = sys.stdin.readline ()
 					if not len (line):
 						break
 					if line[-1] == '\n':
 						line = line[:-1]
 					print callback (line)
 			else:
 				args = sys.argv[1:]
 				if concat_separator != False:
 					args = [concat_separator.join (args)]
 				print separator.join (callback (x) for x in (args))
 		except IOError as e:
 			if e.errno != errno.EPIPE:
 				print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
 				sys.exit (1)


 class Unicode:

 	@staticmethod
 	def decode (s):
 		return '<' + u','.join ("U+%04X" % ord (u) for u in unicode (s, 'utf-8')).encode ('utf-8') + '>'

 	@staticmethod
 	def parse (s):
 		s = re.sub (r"0[xX]", " ", s)
 		s = re.sub (r"[<+>,;&#\\xXuU\n	]", " ", s)
 		return [int (x, 16) for x in s.split (' ') if len (x)]

 	@staticmethod
 	def encode (s):
 		return u''.join (unichr (x) for x in Unicode.parse (s)).encode ('utf-8')

 	shorthands = {
 		"ZERO WIDTH NON-JOINER": "ZWNJ",
 		"ZERO WIDTH JOINER": "ZWJ",
 		"NARROW NO-BREAK SPACE": "NNBSP",
 		"COMBINING GRAPHEME JOINER": "CGJ",
 		"LEFT-TO-RIGHT MARK": "LRM",
 		"RIGHT-TO-LEFT MARK": "RLM",
 		"LEFT-TO-RIGHT EMBEDDING": "LRE",
 		"RIGHT-TO-LEFT EMBEDDING": "RLE",
 		"POP DIRECTIONAL FORMATTING": "PDF",
 		"LEFT-TO-RIGHT OVERRIDE": "LRO",
 		"RIGHT-TO-LEFT OVERRIDE": "RLO",
 	}

 	@staticmethod
 	def pretty_name (u):
 		try:
 			s = unicodedata.name (u)
 		except ValueError:
 			return "XXX"
 		s = re.sub (".* LETTER ", "", s)
 		s = re.sub (".* VOWEL SIGN (.*)", r"\1-MATRA", s)
 		s = re.sub (".* SIGN ", "", s)
 		s = re.sub (".* COMBINING ", "", s)
 		if re.match (".* VIRAMA", s):
 			s = "HALANT"
 		if s in Unicode.shorthands:
 			s = Unicode.shorthands[s]
 		return s

 	@staticmethod
 	def pretty_names (s):
 		s = re.sub (r"[<+>\\uU]", " ", s)
 		s = re.sub (r"0[xX]", " ", s)
 		s = [unichr (int (x, 16)) for x in re.split ('[, \n]', s) if len (x)]
 		return u' + '.join (Unicode.pretty_name (x) for x in s).encode ('utf-8')


 class FileHelpers:

 	@staticmethod
 	def open_file_or_stdin (f):
 		if f == '-':
 			return sys.stdin
 		return file (f)


 class Manifest:

 	@staticmethod
 	def read (s, strict = True):

 		if not os.path.exists (s):
 			if strict:
 				print >> sys.stderr, "%s: %s does not exist" % (sys.argv[0], s)
 				sys.exit (1)
 			return

 		s = os.path.normpath (s)

 		if os.path.isdir (s):

 			try:
 				m = file (os.path.join (s, "MANIFEST"))
 				items = [x.strip () for x in m.readlines ()]
 				for f in items:
 					for p in Manifest.read (os.path.join (s, f)):
 						yield p
 			except IOError:
 				if strict:
 					print >> sys.stderr, "%s: %s does not exist" % (sys.argv[0], os.path.join (s, "MANIFEST"))
 					sys.exit (1)
 				return
 		else:
 			yield s

 	@staticmethod
 	def update_recursive (s):

 		for dirpath, dirnames, filenames in os.walk (s, followlinks=True):

 			for f in ["MANIFEST", "README", "LICENSE", "COPYING", "AUTHORS", "SOURCES", "ChangeLog"]:
 				if f in dirnames:
 					dirnames.remove (f)
 				if f in filenames:
 					filenames.remove (f)
 			dirnames.sort ()
 			filenames.sort ()
 			ms = os.path.join (dirpath, "MANIFEST")
 			print "  GEN    %s" % ms
 			m = open (ms, "w")
 			for f in filenames:
 				print >> m, f
 			for f in dirnames:
 				print >> m, f
 			for f in dirnames:
 				Manifest.update_recursive (os.path.join (dirpath, f))

 if __name__ == '__main__':
 	pass
	#!/usr/bin/python

	import sys, os, re, difflib, unicodedata, errno, cgi
	from itertools import *

	diff_symbols = "-+=*&^%$#@!~/"
	diff_colors = ['red', 'green', 'blue']

	class ColorFormatter:

	class Null:
	@staticmethod
	def start_color (c): return ''
	@staticmethod
	def end_color (): return ''
	@staticmethod
	def escape (s): return s
	@staticmethod
	def newline (): return '\n'

	class ANSI:
	@staticmethod
	def start_color (c):
	return {
	'red': '\033[41;37;1m',
	'green': '\033[42;37;1m',
	'blue': '\033[44;37;1m',
	}[c]
	@staticmethod
	def end_color ():
	return '\033[m'
	@staticmethod
	def escape (s): return s
	@staticmethod
	def newline (): return '\n'

	class HTML:
	@staticmethod
	def start_color (c):
	return '<span style="background:%s">' % c
	@staticmethod
	def end_color ():
	return '</span>'
	@staticmethod
	def escape (s): return cgi.escape (s)
	@staticmethod
	def newline (): return '<br/>\n'

	@staticmethod
	def Auto (argv = [], out = sys.stdout):
	format = ColorFormatter.ANSI
	if "--format" in argv:
	argv.remove ("--format")
	format = ColorFormatter.ANSI
	if "--format=ansi" in argv:
	argv.remove ("--format=ansi")
	format = ColorFormatter.ANSI
	if "--format=html" in argv:
	argv.remove ("--format=html")
	format = ColorFormatter.HTML
	if "--no-format" in argv:
	argv.remove ("--no-format")
	format = ColorFormatter.Null
	return format


	class DiffColorizer:

	diff_regex = re.compile ('([a-za-z0-9_]*)([^a-za-z0-9_]?)')

	def __init__ (self, formatter, colors=diff_colors, symbols=diff_symbols):
	self.formatter = formatter
	self.colors = colors
	self.symbols = symbols

	def colorize_lines (self, lines):
	lines = (l if l else '' for l in lines)
	ss = [self.diff_regex.sub (r'\1\n\2\n', l).splitlines (True) for l in lines]
	oo = ["",""]
	st = [False, False]
	for l in difflib.Differ().compare (*ss):
	if l[0] == '?':
	continue
	if l[0] == ' ':
	for i in range(2):
	if st[i]:
	oo[i] += self.formatter.end_color ()
	st[i] = False
	oo = [o + self.formatter.escape (l[2:]) for o in oo]
	continue
	if l[0] in self.symbols:
	i = self.symbols.index (l[0])
	if not st[i]:
	oo[i] += self.formatter.start_color (self.colors[i])
	st[i] = True
	oo[i] += self.formatter.escape (l[2:])
	continue
	for i in range(2):
	if st[i]:
	oo[i] += self.formatter.end_color ()
	st[i] = False
	oo = [o.replace ('\n', '') for o in oo]
	return [s1+s2+self.formatter.newline () for (s1,s2) in zip (self.symbols, oo) if s2]

	def colorize_diff (self, f):
	lines = [None, None]
	for l in f:
	if l[0] not in self.symbols:
	yield self.formatter.escape (l).replace ('\n', self.formatter.newline ())
	continue
	i = self.symbols.index (l[0])
	if lines[i]:
	# Flush
	for line in self.colorize_lines (lines):
	yield line
	lines = [None, None]
	lines[i] = l[1:]
	if (all (lines)):
	# Flush
	for line in self.colorize_lines (lines):
	yield line
	lines = [None, None]
	if (any (lines)):
	# Flush
	for line in self.colorize_lines (lines):
	yield line


	class ZipDiffer:

	@staticmethod
	def diff_files (files, symbols=diff_symbols):
	files = tuple (files) # in case it's a generator, copy it
	try:
	for lines in izip_longest (*files):
	if all (lines[0] == line for line in lines[1:]):
	sys.stdout.writelines ([" ", lines[0]])
	continue

	for i, l in enumerate (lines):
	if l:
	sys.stdout.writelines ([symbols[i], l])
	except IOError as e:
	if e.errno != errno.EPIPE:
	print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
	sys.exit (1)


	class DiffFilters:

	@staticmethod
	def filter_failures (f):
	for key, lines in DiffHelpers.separate_test_cases (f):
	lines = list (lines)
	if not DiffHelpers.test_passed (lines):
	for l in lines: yield l

	class Stat:

	def __init__ (self):
	self.count = 0
	self.freq = 0

	def add (self, test):
	self.count += 1
	self.freq += test.freq

	class Stats:

	def __init__ (self):
	self.passed = Stat ()
	self.failed = Stat ()
	self.total = Stat ()

	def add (self, test):
	self.total.add (test)
	if test.passed:
	self.passed.add (test)
	else:
	self.failed.add (test)

	def mean (self):
	return float (self.passed.count) / self.total.count

	def variance (self):
	return (float (self.passed.count) / self.total.count) * \
	(float (self.failed.count) / self.total.count)

	def stddev (self):
	return self.variance () ** .5

	def zscore (self, population):
	"""Calculate the standard score.
	Population is the Stats for population.
	Self is Stats for sample.
	Returns larger absolute value if sample is highly unlikely to be random.
	Anything outside of -3..+3 is very unlikely to be random.
	See: http://en.wikipedia.org/wiki/Standard_score"""

	return (self.mean () - population.mean ()) / population.stddev ()




	class DiffSinks:

	@staticmethod
	def print_stat (f):
	passed = 0
	failed = 0
	# XXX port to Stats, but that would really slow us down here
	for key, lines in DiffHelpers.separate_test_cases (f):
	if DiffHelpers.test_passed (lines):
	passed += 1
	else:
	failed += 1
	total = passed + failed
	print "%d out of %d tests passed. %d failed (%g%%)" % (passed, total, failed, 100. * failed / total)

	@staticmethod
	def print_ngrams (f, ns=(1,2,3)):
	gens = tuple (Ngram.generator (n) for n in ns)
	allstats = Stats ()
	allgrams = {}
	for key, lines in DiffHelpers.separate_test_cases (f):
	test = Test (lines)
	allstats.add (test)

	for gen in gens:
	for ngram in gen (test.unicodes):
	if ngram not in allgrams:
	allgrams[ngram] = Stats ()
	allgrams[ngram].add (test)

	importantgrams = {}
	for ngram, stats in allgrams.iteritems ():
	if stats.failed.count >= 30: # for statistical reasons
	importantgrams[ngram] = stats
	allgrams = importantgrams
	del importantgrams

	for ngram, stats in allgrams.iteritems ():
	print "zscore: %9f failed: %6d passed: %6d ngram: <%s>" % (stats.zscore (allstats), stats.failed.count, stats.passed.count, ','.join ("U+%04X" % u for u in ngram))



	class Test:

	def __init__ (self, lines):
	self.freq = 1
	self.passed = True
	self.identifier = None
	self.text = None
	self.unicodes = None
	self.glyphs = None
	for l in lines:
	symbol = l[0]
	if symbol != ' ':
	self.passed = False
	i = 1
	if ':' in l:
	i = l.index (':')
	if not self.identifier:
	self.identifier = l[1:i]
	i = i + 2 # Skip colon and space
	j = -1
	if l[j] == '\n':
	j -= 1
	brackets = l[i] + l[j]
	l = l[i+1:-2]
	if brackets == '()':
	self.text = l
	elif brackets == '<>':
	self.unicodes = Unicode.parse (l)
	elif brackets == '[]':
	# XXX we don't handle failed tests here
	self.glyphs = l


	class DiffHelpers:

	@staticmethod
	def separate_test_cases (f):
	'''Reads lines from f, and if the lines have identifiers, ie.
	have a colon character, groups them by identifier,
	yielding lists of all lines with the same identifier.'''

	def identifier (l):
	if ':' in l[1:]:
	return l[1:l.index (':')]
	return l
	return groupby (f, key=identifier)

	@staticmethod
	def test_passed (lines):
	lines = list (lines)
	# XXX This is a hack, but does the job for now.
	if any (l.find("space+0\|space+0") >= 0 for l in lines if l[0] == '+'): return True
	if any (l.find("uni25CC") >= 0 for l in lines if l[0] == '+'): return True
	if any (l.find("dottedcircle") >= 0 for l in lines if l[0] == '+'): return True
	if any (l.find("glyph0") >= 0 for l in lines if l[0] == '+'): return True
	if any (l.find("gid0") >= 0 for l in lines if l[0] == '+'): return True
	if any (l.find("notdef") >= 0 for l in lines if l[0] == '+'): return True
	return all (l[0] == ' ' for l in lines)


	class FilterHelpers:

	@staticmethod
	def filter_printer_function (filter_callback):
	def printer (f):
	for line in filter_callback (f):
	print line
	return printer

	@staticmethod
	def filter_printer_function_no_newline (filter_callback):
	def printer (f):
	for line in filter_callback (f):
	sys.stdout.writelines ([line])
	return printer


	class Ngram:

	@staticmethod
	def generator (n):

	def gen (f):
	l = []
	for x in f:
	l.append (x)
	if len (l) == n:
	yield tuple (l)
	l[:1] = []

	gen.n = n
	return gen


	class UtilMains:

	@staticmethod
	def process_multiple_files (callback, mnemonic = "FILE"):

	if "--help" in sys.argv:
	print "Usage: %s %s..." % (sys.argv[0], mnemonic)
	sys.exit (1)

	try:
	files = sys.argv[1:] if len (sys.argv) > 1 else ['-']
	for s in files:
	callback (FileHelpers.open_file_or_stdin (s))
	except IOError as e:
	if e.errno != errno.EPIPE:
	print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
	sys.exit (1)

	@staticmethod
	def process_multiple_args (callback, mnemonic):

	if len (sys.argv) == 1 or "--help" in sys.argv:
	print "Usage: %s %s..." % (sys.argv[0], mnemonic)
	sys.exit (1)

	try:
	for s in sys.argv[1:]:
	callback (s)
	except IOError as e:
	if e.errno != errno.EPIPE:
	print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
	sys.exit (1)

	@staticmethod
	def filter_multiple_strings_or_stdin (callback, mnemonic, \
	separator = " ", \
	concat_separator = False):

	if "--help" in sys.argv:
	print "Usage:\n %s %s...\nor:\n %s\n\nWhen called with no arguments, input is read from standard input." \
	% (sys.argv[0], mnemonic, sys.argv[0])
	sys.exit (1)

	try:
	if len (sys.argv) == 1:
	while (1):
	line = sys.stdin.readline ()
	if not len (line):
	break
	if line[-1] == '\n':
	line = line[:-1]
	print callback (line)
	else:
	args = sys.argv[1:]
	if concat_separator != False:
	args = [concat_separator.join (args)]
	print separator.join (callback (x) for x in (args))
	except IOError as e:
	if e.errno != errno.EPIPE:
	print >> sys.stderr, "%s: %s: %s" % (sys.argv[0], e.filename, e.strerror)
	sys.exit (1)


	class Unicode:

	@staticmethod
	def decode (s):
	return '<' + u','.join ("U+%04X" % ord (u) for u in unicode (s, 'utf-8')).encode ('utf-8') + '>'

	@staticmethod
	def parse (s):
	s = re.sub (r"0[xX]", " ", s)
	s = re.sub (r"[<+>,;&#\\xXuU\n ]", " ", s)
	return [int (x, 16) for x in s.split (' ') if len (x)]

	@staticmethod
	def encode (s):
	return u''.join (unichr (x) for x in Unicode.parse (s)).encode ('utf-8')

	shorthands = {
	"ZERO WIDTH NON-JOINER": "ZWNJ",
	"ZERO WIDTH JOINER": "ZWJ",
	"NARROW NO-BREAK SPACE": "NNBSP",
	"COMBINING GRAPHEME JOINER": "CGJ",
	"LEFT-TO-RIGHT MARK": "LRM",
	"RIGHT-TO-LEFT MARK": "RLM",
	"LEFT-TO-RIGHT EMBEDDING": "LRE",
	"RIGHT-TO-LEFT EMBEDDING": "RLE",
	"POP DIRECTIONAL FORMATTING": "PDF",
	"LEFT-TO-RIGHT OVERRIDE": "LRO",
	"RIGHT-TO-LEFT OVERRIDE": "RLO",
	}

	@staticmethod
	def pretty_name (u):
	try:
	s = unicodedata.name (u)
	except ValueError:
	return "XXX"
	s = re.sub (".* LETTER ", "", s)
	s = re.sub (".* VOWEL SIGN (.*)", r"\1-MATRA", s)
	s = re.sub (".* SIGN ", "", s)
	s = re.sub (".* COMBINING ", "", s)
	if re.match (".* VIRAMA", s):
	s = "HALANT"
	if s in Unicode.shorthands:
	s = Unicode.shorthands[s]
	return s

	@staticmethod
	def pretty_names (s):
	s = re.sub (r"[<+>\\uU]", " ", s)
	s = re.sub (r"0[xX]", " ", s)
	s = [unichr (int (x, 16)) for x in re.split ('[, \n]', s) if len (x)]
	return u' + '.join (Unicode.pretty_name (x) for x in s).encode ('utf-8')


	class FileHelpers:

	@staticmethod
	def open_file_or_stdin (f):
	if f == '-':
	return sys.stdin
	return file (f)


	class Manifest:

	@staticmethod
	def read (s, strict = True):

	if not os.path.exists (s):
	if strict:
	print >> sys.stderr, "%s: %s does not exist" % (sys.argv[0], s)
	sys.exit (1)
	return

	s = os.path.normpath (s)

	if os.path.isdir (s):

	try:
	m = file (os.path.join (s, "MANIFEST"))
	items = [x.strip () for x in m.readlines ()]
	for f in items:
	for p in Manifest.read (os.path.join (s, f)):
	yield p
	except IOError:
	if strict:
	print >> sys.stderr, "%s: %s does not exist" % (sys.argv[0], os.path.join (s, "MANIFEST"))
	sys.exit (1)
	return
	else:
	yield s

	@staticmethod
	def update_recursive (s):

	for dirpath, dirnames, filenames in os.walk (s, followlinks=True):

	for f in ["MANIFEST", "README", "LICENSE", "COPYING", "AUTHORS", "SOURCES", "ChangeLog"]:
	if f in dirnames:
	dirnames.remove (f)
	if f in filenames:
	filenames.remove (f)
	dirnames.sort ()
	filenames.sort ()
	ms = os.path.join (dirpath, "MANIFEST")
	print " GEN %s" % ms
	m = open (ms, "w")
	for f in filenames:
	print >> m, f
	for f in dirnames:
	print >> m, f
	for f in dirnames:
	Manifest.update_recursive (os.path.join (dirpath, f))

	if __name__ == '__main__':
	pass