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python/jsmin/jsmin/__init__.py@44a2da4a2ab2 (annotated)

python/jsmin/jsmin/__init__.py

Fri, 16 Jan 2015 04:50:19 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Fri, 16 Jan 2015 04:50:19 +0100

branch

TOR_BUG_9701

changeset 13

44a2da4a2ab2

permissions

-rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

michael@0	1	# This code is original from jsmin by Douglas Crockford, it was translated to
michael@0	2	# Python by Baruch Even. It was rewritten by Dave St.Germain for speed.
michael@0	3	#
michael@0	4	# The MIT License (MIT)
michael@0	5	#
michael@0	6	# Copyright (c) 2013 Dave St.Germain
michael@0	7	#
michael@0	8	# Permission is hereby granted, free of charge, to any person obtaining a copy
michael@0	9	# of this software and associated documentation files (the "Software"), to deal
michael@0	10	# in the Software without restriction, including without limitation the rights
michael@0	11	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
michael@0	12	# copies of the Software, and to permit persons to whom the Software is
michael@0	13	# furnished to do so, subject to the following conditions:
michael@0	14	#
michael@0	15	# The above copyright notice and this permission notice shall be included in
michael@0	16	# all copies or substantial portions of the Software.
michael@0	17	#
michael@0	18	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
michael@0	19	# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
michael@0	20	# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
michael@0	21	# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
michael@0	22	# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
michael@0	23	# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
michael@0	24	# THE SOFTWARE.
michael@0	25
michael@0	26
michael@0	27	import sys
michael@0	28	is_3 = sys.version_info >= (3, 0)
michael@0	29	if is_3:
michael@0	30	import io
michael@0	31	else:
michael@0	32	import StringIO
michael@0	33	try:
michael@0	34	import cStringIO
michael@0	35	except ImportError:
michael@0	36	cStringIO = None
michael@0	37
michael@0	38
michael@0	39	__all__ = ['jsmin', 'JavascriptMinify']
michael@0	40	__version__ = '2.0.3'
michael@0	41
michael@0	42
michael@0	43	def jsmin(js):
michael@0	44	"""
michael@0	45	returns a minified version of the javascript string
michael@0	46	"""
michael@0	47	if not is_3:
michael@0	48	if cStringIO and not isinstance(js, unicode):
michael@0	49	# strings can use cStringIO for a 3x performance
michael@0	50	# improvement, but unicode (in python2) cannot
michael@0	51	klass = cStringIO.StringIO
michael@0	52	else:
michael@0	53	klass = StringIO.StringIO
michael@0	54	else:
michael@0	55	klass = io.StringIO
michael@0	56	ins = klass(js)
michael@0	57	outs = klass()
michael@0	58	JavascriptMinify(ins, outs).minify()
michael@0	59	return outs.getvalue()
michael@0	60
michael@0	61
michael@0	62	class JavascriptMinify(object):
michael@0	63	"""
michael@0	64	Minify an input stream of javascript, writing
michael@0	65	to an output stream
michael@0	66	"""
michael@0	67
michael@0	68	def __init__(self, instream=None, outstream=None):
michael@0	69	self.ins = instream
michael@0	70	self.outs = outstream
michael@0	71
michael@0	72	def minify(self, instream=None, outstream=None):
michael@0	73	if instream and outstream:
michael@0	74	self.ins, self.outs = instream, outstream
michael@0	75	write = self.outs.write
michael@0	76	read = self.ins.read
michael@0	77
michael@0	78	space_strings = "abcdefghijklmnopqrstuvwxyz"\
michael@0	79	"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$\\"
michael@0	80	starters, enders = '{[(+-', '}])+-"\''
michael@0	81	newlinestart_strings = starters + space_strings
michael@0	82	newlineend_strings = enders + space_strings
michael@0	83	do_newline = False
michael@0	84	do_space = False
michael@0	85	doing_single_comment = False
michael@0	86	previous_before_comment = ''
michael@0	87	doing_multi_comment = False
michael@0	88	in_re = False
michael@0	89	in_quote = ''
michael@0	90	quote_buf = []
michael@0	91
michael@0	92	previous = read(1)
michael@0	93	next1 = read(1)
michael@0	94	if previous == '/':
michael@0	95	if next1 == '/':
michael@0	96	doing_single_comment = True
michael@0	97	elif next1 == '*':
michael@0	98	doing_multi_comment = True
michael@0	99	else:
michael@0	100	write(previous)
michael@0	101	elif not previous:
michael@0	102	return
michael@0	103	elif previous >= '!':
michael@0	104	if previous in "'\"":
michael@0	105	in_quote = previous
michael@0	106	write(previous)
michael@0	107	previous_non_space = previous
michael@0	108	else:
michael@0	109	previous_non_space = ' '
michael@0	110	if not next1:
michael@0	111	return
michael@0	112
michael@0	113	while 1:
michael@0	114	next2 = read(1)
michael@0	115	if not next2:
michael@0	116	last = next1.strip()
michael@0	117	if not (doing_single_comment or doing_multi_comment)\
michael@0	118	and last not in ('', '/'):
michael@0	119	write(last)
michael@0	120	break
michael@0	121	if doing_multi_comment:
michael@0	122	if next1 == '*' and next2 == '/':
michael@0	123	doing_multi_comment = False
michael@0	124	next2 = read(1)
michael@0	125	elif doing_single_comment:
michael@0	126	if next1 in '\r\n':
michael@0	127	doing_single_comment = False
michael@0	128	while next2 in '\r\n':
michael@0	129	next2 = read(1)
michael@0	130	if not next2:
michael@0	131	break
michael@0	132	if previous_before_comment in ')}]':
michael@0	133	do_newline = True
michael@0	134	elif previous_before_comment in space_strings:
michael@0	135	write('\n')
michael@0	136	elif in_quote:
michael@0	137	quote_buf.append(next1)
michael@0	138
michael@0	139	if next1 == in_quote:
michael@0	140	numslashes = 0
michael@0	141	for c in reversed(quote_buf[:-1]):
michael@0	142	if c != '\\':
michael@0	143	break
michael@0	144	else:
michael@0	145	numslashes += 1
michael@0	146	if numslashes % 2 == 0:
michael@0	147	in_quote = ''
michael@0	148	write(''.join(quote_buf))
michael@0	149	elif next1 in '\r\n':
michael@0	150	if previous_non_space in newlineend_strings \
michael@0	151	or previous_non_space > '~':
michael@0	152	while 1:
michael@0	153	if next2 < '!':
michael@0	154	next2 = read(1)
michael@0	155	if not next2:
michael@0	156	break
michael@0	157	else:
michael@0	158	if next2 in newlinestart_strings \
michael@0	159	or next2 > '~' or next2 == '/':
michael@0	160	do_newline = True
michael@0	161	break
michael@0	162	elif next1 < '!' and not in_re:
michael@0	163	if (previous_non_space in space_strings \
michael@0	164	or previous_non_space > '~') \
michael@0	165	and (next2 in space_strings or next2 > '~'):
michael@0	166	do_space = True
michael@0	167	elif next1 == '/':
michael@0	168	if in_re:
michael@0	169	if previous != '\\':
michael@0	170	in_re = False
michael@0	171	write('/')
michael@0	172	elif next2 == '/':
michael@0	173	doing_single_comment = True
michael@0	174	previous_before_comment = previous_non_space
michael@0	175	elif next2 == '*':
michael@0	176	doing_multi_comment = True
michael@0	177	else:
michael@0	178	in_re = previous_non_space in '(,=:[?!&|'
michael@0	179	write('/')
michael@0	180	else:
michael@0	181	if do_space:
michael@0	182	do_space = False
michael@0	183	write(' ')
michael@0	184	if do_newline:
michael@0	185	write('\n')
michael@0	186	do_newline = False
michael@0	187	write(next1)
michael@0	188	if not in_re and next1 in "'\"":
michael@0	189	in_quote = next1
michael@0	190	quote_buf = []
michael@0	191	previous = next1
michael@0	192	next1 = next2
michael@0	193
michael@0	194	if previous >= '!':
michael@0	195	previous_non_space = previous