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#!/usr/bin/env python | ||
# | ||
# Copyright 2011 - 2013 | ||
# Andr\xe9 Malo or his licensors, as applicable | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
r""" | ||
===================== | ||
Javascript Minifier | ||
===================== | ||
rJSmin is a javascript minifier written in python. | ||
The minifier is based on the semantics of `jsmin.c by Douglas Crockford`_\. | ||
The module is a re-implementation aiming for speed, so it can be used at | ||
runtime (rather than during a preprocessing step). Usually it produces the | ||
same results as the original ``jsmin.c``. It differs in the following ways: | ||
- there is no error detection: unterminated string, regex and comment | ||
literals are treated as regular javascript code and minified as such. | ||
- Control characters inside string and regex literals are left untouched; they | ||
are not converted to spaces (nor to \n) | ||
- Newline characters are not allowed inside string and regex literals, except | ||
for line continuations in string literals (ECMA-5). | ||
- "return /regex/" is recognized correctly. | ||
- "+ +" and "- -" sequences are not collapsed to '++' or '--' | ||
- Newlines before ! operators are removed more sensibly | ||
- rJSmin does not handle streams, but only complete strings. (However, the | ||
module provides a "streamy" interface). | ||
Since most parts of the logic are handled by the regex engine it's way | ||
faster than the original python port of ``jsmin.c`` by Baruch Even. The speed | ||
factor varies between about 6 and 55 depending on input and python version | ||
(it gets faster the more compressed the input already is). Compared to the | ||
speed-refactored python port by Dave St.Germain the performance gain is less | ||
dramatic but still between 1.2 and 7. See the docs/BENCHMARKS file for | ||
details. | ||
rjsmin.c is a reimplementation of rjsmin.py in C and speeds it up even more. | ||
Both python 2 and python 3 are supported. | ||
.. _jsmin.c by Douglas Crockford: | ||
http://www.crockford.com/javascript/jsmin.c | ||
""" | ||
__author__ = "Andr\xe9 Malo" | ||
__author__ = getattr(__author__, 'decode', lambda x: __author__)('latin-1') | ||
__docformat__ = "restructuredtext en" | ||
__license__ = "Apache License, Version 2.0" | ||
__version__ = '1.0.7' | ||
__all__ = ['jsmin'] | ||
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import re as _re | ||
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def _make_jsmin(python_only=False): | ||
""" | ||
Generate JS minifier based on `jsmin.c by Douglas Crockford`_ | ||
.. _jsmin.c by Douglas Crockford: | ||
http://www.crockford.com/javascript/jsmin.c | ||
:Parameters: | ||
`python_only` : ``bool`` | ||
Use only the python variant. If true, the c extension is not even | ||
tried to be loaded. | ||
:Return: Minifier | ||
:Rtype: ``callable`` | ||
""" | ||
# pylint: disable = R0912, R0914, W0612 | ||
if not python_only: | ||
try: | ||
import _rjsmin | ||
except ImportError: | ||
pass | ||
else: | ||
return _rjsmin.jsmin | ||
try: | ||
xrange | ||
except NameError: | ||
xrange = range # pylint: disable = W0622 | ||
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space_chars = r'[\000-\011\013\014\016-\040]' | ||
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line_comment = r'(?://[^\r\n]*)' | ||
space_comment = r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)' | ||
string1 = \ | ||
r'(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|\r)[^\047\\\r\n]*)*\047)' | ||
string2 = r'(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|\r)[^"\\\r\n]*)*")' | ||
strings = r'(?:%s|%s)' % (string1, string2) | ||
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charclass = r'(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\])' | ||
nospecial = r'[^/\\\[\r\n]' | ||
regex = r'(?:/(?![\r\n/*])%s*(?:(?:\\[^\r\n]|%s)%s*)*/)' % ( | ||
nospecial, charclass, nospecial) | ||
space = r'(?:%s|%s)' % (space_chars, space_comment) | ||
newline = r'(?:%s?[\r\n])' % line_comment | ||
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def fix_charclass(result): | ||
""" Fixup string of chars to fit into a regex char class """ | ||
pos = result.find('-') | ||
if pos >= 0: | ||
result = r'%s%s-' % (result[:pos], result[pos + 1:]) | ||
|
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def sequentize(string): | ||
""" | ||
Notate consecutive characters as sequence | ||
(1-4 instead of 1234) | ||
""" | ||
first, last, result = None, None, [] | ||
for char in map(ord, string): | ||
if last is None: | ||
first = last = char | ||
elif last + 1 == char: | ||
last = char | ||
else: | ||
result.append((first, last)) | ||
first = last = char | ||
if last is not None: | ||
result.append((first, last)) | ||
return ''.join(['%s%s%s' % ( | ||
chr(first), | ||
last > first + 1 and '-' or '', | ||
last != first and chr(last) or '') for first, last in result]) | ||
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return _re.sub(r'([\000-\040\047])', # for better portability | ||
lambda m: '\\%03o' % ord(m.group(1)), (sequentize(result) | ||
.replace('\\', '\\\\') | ||
.replace('[', '\\[') | ||
.replace(']', '\\]'))) | ||
|
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def id_literal_(what): | ||
""" Make id_literal like char class """ | ||
match = _re.compile(what).match | ||
result = ''.join([chr(c) for c in xrange(127) if not match(chr(c))]) | ||
return '[^%s]' % fix_charclass(result) | ||
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def not_id_literal_(keep): | ||
""" Make negated id_literal like char class """ | ||
match = _re.compile(id_literal_(keep)).match | ||
result = ''.join([chr(c) for c in xrange(127) if not match(chr(c))]) | ||
return r'[%s]' % fix_charclass(result) | ||
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not_id_literal = not_id_literal_(r'[a-zA-Z0-9_$]') | ||
preregex1 = r'[(,=:\[!&|?{};\r\n]' | ||
preregex2 = r'%(not_id_literal)sreturn' % locals() | ||
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id_literal = id_literal_(r'[a-zA-Z0-9_$]') | ||
id_literal_open = id_literal_(r'[a-zA-Z0-9_${\[(!+-]') | ||
id_literal_close = id_literal_(r'[a-zA-Z0-9_$}\])"\047+-]') | ||
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dull = r'[^\047"/\000-\040]' | ||
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space_sub = _re.compile(( | ||
r'(%(dull)s+)' | ||
r'|(%(strings)s%(dull)s*)' | ||
r'|(?<=%(preregex1)s)' | ||
r'%(space)s*(?:%(newline)s%(space)s*)*' | ||
r'(%(regex)s%(dull)s*)' | ||
r'|(?<=%(preregex2)s)' | ||
r'%(space)s*(?:%(newline)s%(space)s)*' | ||
r'(%(regex)s%(dull)s*)' | ||
r'|(?<=%(id_literal_close)s)' | ||
r'%(space)s*(?:(%(newline)s)%(space)s*)+' | ||
r'(?=%(id_literal_open)s)' | ||
r'|(?<=%(id_literal)s)(%(space)s)+(?=%(id_literal)s)' | ||
r'|(?<=\+)(%(space)s)+(?=\+)' | ||
r'|(?<=-)(%(space)s)+(?=-)' | ||
r'|%(space)s+' | ||
r'|(?:%(newline)s%(space)s*)+') % locals()).sub | ||
#print space_sub.__self__.pattern | ||
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def space_subber(match): | ||
""" Substitution callback """ | ||
# pylint: disable = C0321, R0911 | ||
groups = match.groups() | ||
if groups[0]: | ||
return groups[0] | ||
elif groups[1]: | ||
return groups[1] | ||
elif groups[2]: | ||
return groups[2] | ||
elif groups[3]: | ||
return groups[3] | ||
elif groups[4]: | ||
return '\n' | ||
elif groups[5] or groups[6] or groups[7]: | ||
return ' ' | ||
else: | ||
return '' | ||
|
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def jsmin(script): # pylint: disable = W0621 | ||
r""" | ||
Minify javascript based on `jsmin.c by Douglas Crockford`_\. | ||
Instead of parsing the stream char by char, it uses a regular | ||
expression approach which minifies the whole script with one big | ||
substitution regex. | ||
.. _jsmin.c by Douglas Crockford: | ||
http://www.crockford.com/javascript/jsmin.c | ||
:Parameters: | ||
`script` : ``str`` | ||
Script to minify | ||
:Return: Minified script | ||
:Rtype: ``str`` | ||
""" | ||
return space_sub(space_subber, '\n%s\n' % script).strip() | ||
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return jsmin | ||
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jsmin = _make_jsmin() | ||
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def jsmin_for_posers(script): | ||
r""" | ||
Minify javascript based on `jsmin.c by Douglas Crockford`_\. | ||
Instead of parsing the stream char by char, it uses a regular | ||
expression approach which minifies the whole script with one big | ||
substitution regex. | ||
.. _jsmin.c by Douglas Crockford: | ||
http://www.crockford.com/javascript/jsmin.c | ||
:Warning: This function is the digest of a _make_jsmin() call. It just | ||
utilizes the resulting regex. It's just for fun here and may | ||
vanish any time. Use the `jsmin` function instead. | ||
:Parameters: | ||
`script` : ``str`` | ||
Script to minify | ||
:Return: Minified script | ||
:Rtype: ``str`` | ||
""" | ||
def subber(match): | ||
""" Substitution callback """ | ||
groups = match.groups() | ||
return ( | ||
groups[0] or | ||
groups[1] or | ||
groups[2] or | ||
groups[3] or | ||
(groups[4] and '\n') or | ||
(groups[5] and ' ') or | ||
(groups[6] and ' ') or | ||
(groups[7] and ' ') or | ||
'') | ||
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return _re.sub( | ||
r'([^\047"/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]|\r?' | ||
r'\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|' | ||
r'\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|(?<=[(,=:\[!&|?{};\r\n])(?' | ||
r':[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*' | ||
r'(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*' | ||
r'[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*((?:/(?![\r\n/*])[^/\\\[\r\n]*(?:(' | ||
r'?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[' | ||
r'\r\n]*)*/)[^\047"/\000-\040]*)|(?<=[\000-#%-,./:-@\[-^`{-~-]return' | ||
r')(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/' | ||
r'))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:' | ||
r'/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))*((?:/(?![\r\n/*])[^/\\\[\r\n]*(?' | ||
r':(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\]))[^/' | ||
r'\\\[\r\n]*)*/)[^\047"/\000-\040]*)|(?<=[^\000-!#%&(*,./:-@\[\\^`{|' | ||
r'~])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)' | ||
r'*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013\014\016-\040]' | ||
r'|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040"#%-\047)*,./' | ||
r':-@\\-^`|-~])|(?<=[^\000-#%-,./:-@\[-^`{-~-])((?:[\000-\011\013\01' | ||
r'4\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^\000-#%-,./:' | ||
r'-@\[-^`{-~-])|(?<=\+)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*' | ||
r'\*+(?:[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\013\014\016-' | ||
r'\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\000-\011\013' | ||
r'\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+|(?:(?:(?://[^' | ||
r'\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^' | ||
r'/*][^*]*\*+)*/))*)+', subber, '\n%s\n' % script).strip() | ||
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if __name__ == '__main__': | ||
import sys as _sys | ||
_sys.stdout.write(jsmin(_sys.stdin.read())) |