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292 lines
10 KiB
Python
Executable File
292 lines
10 KiB
Python
Executable File
#!/usr/bin/env python
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# -*- coding: ascii -*-
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#
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# Copyright 2011, 2012
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# Andr\xe9 Malo or his licensors, as applicable
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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r"""
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=====================
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Javascript Minifier
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=====================
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rJSmin is a javascript minifier written in python.
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The minifier is based on the semantics of `jsmin.c by Douglas Crockford`_\.
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The module is a re-implementation aiming for speed, so it can be used at
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runtime (rather than during a preprocessing step). Usually it produces the
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same results as the original ``jsmin.c``. It differs in the following ways:
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- there is no error detection: unterminated string, regex and comment
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literals are treated as regular javascript code and minified as such.
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- Control characters inside string and regex literals are left untouched; they
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are not converted to spaces (nor to \n)
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- Newline characters are not allowed inside string and regex literals, except
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for line continuations in string literals (ECMA-5).
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- "return /regex/" is recognized correctly.
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- "+ +" and "- -" sequences are not collapsed to '++' or '--'
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- Newlines before ! operators are removed more sensibly
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- rJSmin does not handle streams, but only complete strings. (However, the
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module provides a "streamy" interface).
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Since most parts of the logic are handled by the regex engine it's way
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faster than the original python port of ``jsmin.c`` by Baruch Even. The speed
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factor varies between about 6 and 55 depending on input and python version
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(it gets faster the more compressed the input already is). Compared to the
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speed-refactored python port by Dave St.Germain the performance gain is less
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dramatic but still between 1.2 and 7. See the docs/BENCHMARKS file for
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details.
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rjsmin.c is a reimplementation of rjsmin.py in C and speeds it up even more.
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Both python 2 and python 3 are supported.
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.. _jsmin.c by Douglas Crockford:
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http://www.crockford.com/javascript/jsmin.c
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"""
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__author__ = "Andr\xe9 Malo"
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__author__ = getattr(__author__, 'decode', lambda x: __author__)('latin-1')
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__docformat__ = "restructuredtext en"
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__license__ = "Apache License, Version 2.0"
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__version__ = '1.0.5'
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__all__ = ['jsmin']
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import re as _re
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def _make_jsmin(python_only=False):
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"""
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Generate JS minifier based on `jsmin.c by Douglas Crockford`_
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.. _jsmin.c by Douglas Crockford:
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http://www.crockford.com/javascript/jsmin.c
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:Parameters:
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`python_only` : ``bool``
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Use only the python variant. If true, the c extension is not even
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tried to be loaded.
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:Return: Minifier
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:Rtype: ``callable``
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"""
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# pylint: disable = R0912, R0914, W0612
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if not python_only:
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try:
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import _rjsmin
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except ImportError:
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pass
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else:
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return _rjsmin.jsmin
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try:
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xrange
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except NameError:
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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]*)'
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space_comment = r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)'
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string1 = \
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r'(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|\r)[^\047\\\r\n]*)*\047)'
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string2 = r'(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|\r)[^"\\\r\n]*)*")'
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strings = r'(?:%s|%s)' % (string1, string2)
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charclass = r'(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\])'
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nospecial = r'[^/\\\[\r\n]'
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regex = r'(?:/(?![\r\n/*])%s*(?:(?:\\[^\r\n]|%s)%s*)*/)' % (
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nospecial, charclass, nospecial
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)
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space = r'(?:%s|%s)' % (space_chars, space_comment)
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newline = r'(?:%s?[\r\n])' % line_comment
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def fix_charclass(result):
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""" Fixup string of chars to fit into a regex char class """
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pos = result.find('-')
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if pos >= 0:
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result = r'%s%s-' % (result[:pos], result[pos + 1:])
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def sequentize(string):
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"""
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Notate consecutive characters as sequence
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(1-4 instead of 1234)
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"""
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first, last, result = None, None, []
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for char in map(ord, string):
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if last is None:
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first = last = char
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elif last + 1 == char:
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last = char
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else:
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result.append((first, last))
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first = last = char
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if last is not None:
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result.append((first, last))
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return ''.join(['%s%s%s' % (
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chr(first),
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last > first + 1 and '-' or '',
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last != first and chr(last) or ''
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) for first, last in result])
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return _re.sub(r'([\000-\040\047])', # for better portability
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lambda m: '\\%03o' % ord(m.group(1)), (sequentize(result)
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.replace('\\', '\\\\')
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.replace('[', '\\[')
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.replace(']', '\\]')
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)
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)
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def id_literal_(what):
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""" Make id_literal like char class """
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match = _re.compile(what).match
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result = ''.join([
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chr(c) for c in xrange(127) if not match(chr(c))
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])
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return '[^%s]' % fix_charclass(result)
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def not_id_literal_(keep):
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""" Make negated id_literal like char class """
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match = _re.compile(id_literal_(keep)).match
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result = ''.join([
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chr(c) for c in xrange(127) if not match(chr(c))
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])
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return r'[%s]' % fix_charclass(result)
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not_id_literal = not_id_literal_(r'[a-zA-Z0-9_$]')
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preregex1 = r'[(,=:\[!&|?{};\r\n]'
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preregex2 = r'%(not_id_literal)sreturn' % locals()
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id_literal = id_literal_(r'[a-zA-Z0-9_$]')
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id_literal_open = id_literal_(r'[a-zA-Z0-9_${\[(!+-]')
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id_literal_close = id_literal_(r'[a-zA-Z0-9_$}\])"\047+-]')
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space_sub = _re.compile((
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r'([^\047"/\000-\040]+)'
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r'|(%(strings)s[^\047"/\000-\040]*)'
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r'|(?:(?<=%(preregex1)s)%(space)s*(%(regex)s[^\047"/\000-\040]*))'
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r'|(?:(?<=%(preregex2)s)%(space)s*(%(regex)s[^\047"/\000-\040]*))'
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r'|(?<=%(id_literal_close)s)'
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r'%(space)s*(?:(%(newline)s)%(space)s*)+'
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r'(?=%(id_literal_open)s)'
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r'|(?<=%(id_literal)s)(%(space)s)+(?=%(id_literal)s)'
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r'|(?<=\+)(%(space)s)+(?=\+)'
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r'|(?<=-)(%(space)s)+(?=-)'
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r'|%(space)s+'
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r'|(?:%(newline)s%(space)s*)+'
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) % locals()).sub
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#print space_sub.__self__.pattern
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def space_subber(match):
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""" Substitution callback """
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# pylint: disable = C0321, R0911
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groups = match.groups()
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if groups[0]: return groups[0]
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elif groups[1]: return groups[1]
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elif groups[2]: return groups[2]
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elif groups[3]: return groups[3]
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elif groups[4]: return '\n'
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elif groups[5] or groups[6] or groups[7]: return ' '
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else: return ''
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def jsmin(script): # pylint: disable = W0621
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r"""
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Minify javascript based on `jsmin.c by Douglas Crockford`_\.
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Instead of parsing the stream char by char, it uses a regular
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expression approach which minifies the whole script with one big
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substitution regex.
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.. _jsmin.c by Douglas Crockford:
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http://www.crockford.com/javascript/jsmin.c
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:Parameters:
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`script` : ``str``
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Script to minify
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:Return: Minified script
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:Rtype: ``str``
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"""
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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):
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r"""
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Minify javascript based on `jsmin.c by Douglas Crockford`_\.
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Instead of parsing the stream char by char, it uses a regular
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expression approach which minifies the whole script with one big
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substitution regex.
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.. _jsmin.c by Douglas Crockford:
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http://www.crockford.com/javascript/jsmin.c
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:Warning: This function is the digest of a _make_jsmin() call. It just
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utilizes the resulting regex. It's just for fun here and may
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vanish any time. Use the `jsmin` function instead.
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:Parameters:
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`script` : ``str``
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Script to minify
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:Return: Minified script
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:Rtype: ``str``
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"""
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def subber(match):
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""" Substitution callback """
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groups = match.groups()
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return (
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groups[0] or
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groups[1] or
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groups[2] or
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groups[3] or
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(groups[4] and '\n') or
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(groups[5] and ' ') or
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(groups[6] and ' ') or
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(groups[7] and ' ') or
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''
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)
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return _re.sub(
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r'([^\047"/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]|\r?'
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r'\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|'
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r'\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|(?:(?<=[(,=:\[!&|?{};\r\n]'
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r')(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/'
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r'))*((?:/(?![\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*'
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r'(?:\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/)[^\047"/\000-\040]*'
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r'))|(?:(?<=[\000-#%-,./:-@\[-^`{-~-]return)(?:[\000-\011\013\014\01'
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r'6-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*((?:/(?![\r\n/*])[^/'
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r'\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]'
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r'*)*\]))[^/\\\[\r\n]*)*/)[^\047"/\000-\040]*))|(?<=[^\000-!#%&(*,./'
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r':-@\[\\^`{|~])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/'
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r'*][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013\01'
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r'4\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040"#'
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r'%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#%-,./:-@\[-^`{-~-])((?:[\000-'
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r'\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^'
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r'\000-#%-,./:-@\[-^`{-~-])|(?<=\+)((?:[\000-\011\013\014\016-\040]|'
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r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\0'
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r'13\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\0'
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r'00-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+|(?:'
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r'(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*'
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r']*\*+(?:[^/*][^*]*\*+)*/))*)+', subber, '\n%s\n' % script
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).strip()
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if __name__ == '__main__':
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import sys as _sys
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_sys.stdout.write(jsmin(_sys.stdin.read()))
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