rjsmin.py

#!/usr/bin/env python
# -*- coding: ascii -*-
u"""
=====================
 Javascript Minifier
=====================

rJSmin is a javascript minifier written in python.

The minifier is based on the semantics of `jsmin.c by Douglas Crockford`_\\.

:Copyright:

 Copyright 2011 - 2021
 Andr\xe9 Malo or his licensors, as applicable

:License:

 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.

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.
- More characters are allowed before regexes.
- Line terminators after regex literals are handled more sensibly
- "+ +" and "- -" sequences are not collapsed to '++' or '--'
- Newlines before ! operators are removed more sensibly
- (Unnested) template literals are supported (ECMA-6)
- Comments starting with an exclamation mark (``!``) can be kept optionally
- 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 3 and 50 (for huge inputs). See the docs/BENCHMARKS
file for details.

rjsmin.c is a reimplementation of rjsmin.py in C and speeds it up even more.

Supported python versions are 2.7 and 3.6+.

.. _jsmin.c by Douglas Crockford:
   http://www.crockford.com/javascript/jsmin.c
"""
__author__ = u"Andr\xe9 Malo"
__license__ = "Apache License, Version 2.0"
__version__ = '1.2.0'
__all__ = ['jsmin']

import functools as _ft
import re as _re


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.

    Returns:
      callable: Minifier
    """
    # pylint: disable = unused-variable
    # pylint: disable = too-many-locals

    if not python_only:
        try:
            import _rjsmin
        except ImportError:
            pass
        else:
            # Ensure that the C version is in sync
            # https://github.com/ndparker/rjsmin/issues/11
            if getattr(_rjsmin, '__version__', None) == __version__:
                return _rjsmin.jsmin
    try:
        xrange
    except NameError:
        xrange = range  # pylint: disable = redefined-builtin

    space_chars = r'[\000-\011\013\014\016-\040]'

    line_comment = r'(?://[^\r\n]*)'
    space_comment = r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)'
    space_comment_nobang = r'(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/)'
    bang_comment = r'(?:/\*![^*]*\*+(?:[^/*][^*]*\*+)*/)'

    string1 = r"(?:'[^'\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|\r)[^'\\\r\n]*)*')"
    string1 = string1.replace("'", r'\047')  # portability
    string2 = r'(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|\r)[^"\\\r\n]*)*")'
    string3 = r'(?:`[^`\\]*(?:\\(?:[^\r\n]|\r?\n|\r)[^`\\]*)*`)'
    string3 = string3.replace('`', r'\140')  # portability
    strings = r'(?:%s|%s|%s)' % (string1, string2, string3)

    charclass = r'(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\])'
    nospecial = r'[^/\\\[\r\n]'
    regex = r'(?:/(?![\r\n/*])%s*(?:(?:\\[^\r\n]|%s)%s*)*/[a-z]*)' % (
        nospecial, charclass, nospecial
    )
    space = r'(?:%s|%s)' % (space_chars, space_comment)
    newline = r'(?:%s?[\r\n])' % line_comment

    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:])

        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])  # noqa

        return _re.sub(
            r"([\000-\040'`])",  # ' and ` for better portability
            lambda m: '\\%03o' % ord(m.group(1)), (
                sequentize(result)
                .replace('\\', '\\\\')
                .replace('[', '\\[')
                .replace(']', '\\]')
            )
        )

    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)

    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)

    not_id_literal = not_id_literal_(r'[a-zA-Z0-9_$]')
    preregex1 = r'[(,=:\[!&|?{};\r\n+*-]'
    preregex2 = r'%(not_id_literal)sreturn' % locals()

    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\140+-]')
    post_regex_off = id_literal_(r'[^\000-\040}\])?:|,;.&=+-]')

    dull = r'[^\047"\140/\000-\040]'

    space_sub_simple = _re.compile((
        # noqa pylint: disable = bad-option-value, bad-continuation

        r'(%(dull)s+)'                                         # 0
        r'|(%(strings)s%(dull)s*)'                             # 1
        r'|(?<=[)])'
            r'%(space)s*(?:%(newline)s%(space)s*)*'
            r'(%(regex)s)'                                     # 2
            r'(?=%(space)s*(?:%(newline)s%(space)s*)*'
                r'\.'
                r'%(space)s*(?:%(newline)s%(space)s*)*[a-z])'
        r'|(?<=%(preregex1)s)'
            r'%(space)s*(?:%(newline)s%(space)s*)*'
            r'(%(regex)s)'                                     # 3
            r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 4
                r'(?=%(post_regex_off)s))?'
        r'|(?<=%(preregex2)s)'
            r'%(space)s*(?:(%(newline)s)%(space)s*)*'          # 5
            r'(%(regex)s)'                                     # 6
            r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 7
                r'(?=%(post_regex_off)s))?'
        r'|(?<=%(id_literal_close)s)'
            r'%(space)s*(?:(%(newline)s)%(space)s*)+'          # 8
            r'(?=%(id_literal_open)s)'
        r'|(?<=%(id_literal)s)(%(space)s)+(?=%(id_literal)s)'  # 9
        r'|(?<=\+)(%(space)s)+(?=\+)'                          # 10
        r'|(?<=-)(%(space)s)+(?=-)'                            # 11
        r'|%(space)s+'
        r'|(?:%(newline)s%(space)s*)+'
    ) % locals()).sub

    # print(space_sub_simple.__self__.pattern)

    def space_subber_simple(match):
        """ Substitution callback """
        # pylint: disable = too-many-return-statements

        groups = match.groups()
        if groups[0]:
            return groups[0]
        elif groups[1]:
            return groups[1]
        elif groups[2]:
            return groups[2]
        elif groups[3]:
            if groups[4]:
                return groups[3] + '\n'
            return groups[3]
        elif groups[6]:
            return "%s%s%s" % (
                groups[5] and '\n' or '',
                groups[6],
                groups[7] and '\n' or '',
            )
        elif groups[8]:
            return '\n'
        elif groups[9] or groups[10] or groups[11]:
            return ' '
        else:
            return ''

    space_sub_banged = _re.compile((
        # noqa pylint: disable = bad-option-value, bad-continuation

        r'(%(dull)s+)'                                         # 0
        r'|(%(strings)s%(dull)s*)'                             # 1
        r'|(?<=[)])'
            r'(%(space)s*(?:%(newline)s%(space)s*)*)'          # 2
            r'(%(regex)s)'                                     # 3
            r'(?=%(space)s*(?:%(newline)s%(space)s*)*'
                r'\.'
                r'%(space)s*(?:%(newline)s%(space)s*)*[a-z])'
        r'|(?<=%(preregex1)s)'
            r'(%(space)s*(?:%(newline)s%(space)s*)*)'          # 4
            r'(%(regex)s)'                                     # 5
            r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 6
                r'(?=%(post_regex_off)s))?'
        r'|(?<=%(preregex2)s)'
            r'(%(space)s*(?:(%(newline)s)%(space)s*)*)'        # 7, 8
            r'(%(regex)s)'                                     # 9
            r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 10
                r'(?=%(post_regex_off)s))?'
        r'|(?<=%(id_literal_close)s)'
            r'(%(space)s*(?:%(newline)s%(space)s*)+)'          # 11
            r'(?=%(id_literal_open)s)'
        r'|(?<=%(id_literal)s)(%(space)s+)(?=%(id_literal)s)'  # 12
        r'|(?<=\+)(%(space)s+)(?=\+)'                          # 13
        r'|(?<=-)(%(space)s+)(?=-)'                            # 14
        r'|(%(space)s+)'                                       # 15
        r'|((?:%(newline)s%(space)s*)+)'                       # 16
    ) % locals()).sub

    # print(space_sub_banged.__self__.pattern)

    keep = _re.compile((
        r'%(space_chars)s+|%(space_comment_nobang)s+|%(newline)s+'
        r'|(%(bang_comment)s+)'
    ) % locals()).sub
    keeper = lambda m: m.groups()[0] or ''

    # print(keep.__self__.pattern)

    def space_subber_banged(match):
        """ Substitution callback """
        # pylint: disable = too-many-return-statements

        groups = match.groups()
        if groups[0]:
            return groups[0]
        elif groups[1]:
            return groups[1]
        elif groups[3]:
            return "%s%s" % (
                keep(keeper, groups[2]),
                groups[3],
            )
        elif groups[5]:
            return "%s%s%s%s" % (
                keep(keeper, groups[4]),
                groups[5],
                keep(keeper, groups[6] or ''),
                groups[6] and '\n' or '',
            )
        elif groups[9]:
            return "%s%s%s%s%s" % (
                keep(keeper, groups[7]),
                groups[8] and '\n' or '',
                groups[9],
                keep(keeper, groups[10] or ''),
                groups[10] and '\n' or '',
            )
        elif groups[11]:
            return keep(keeper, groups[11]) + '\n'
        elif groups[12] or groups[13] or groups[14]:
            return keep(keeper, groups[12] or groups[13] or groups[14]) or ' '
        else:
            return keep(keeper, groups[15] or groups[16])

    banged = _ft.partial(space_sub_banged, space_subber_banged)
    simple = _ft.partial(space_sub_simple, space_subber_simple)

    def jsmin(script, keep_bang_comments=False):
        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

          keep_bang_comments (bool):
            Keep comments starting with an exclamation mark? (``/*!...*/``)

        Returns:
          str: Minified script
        """
        # pylint: disable = redefined-outer-name

        is_bytes, script = _as_str(script)
        script = (banged if keep_bang_comments else simple)(
            '\n%s\n' % script
        ).strip()
        if is_bytes:
            script = script.encode('latin-1')
            if is_bytes == 2:
                script = bytearray(script)
        return script

    return jsmin

jsmin = _make_jsmin()


def _as_str(script):
    """ Make sure the script is a text string """
    is_bytes = False
    if str is bytes:
        if not isinstance(script, basestring):  # noqa pylint: disable = undefined-variable
            raise TypeError("Unexpected type")
    elif isinstance(script, bytes):
        is_bytes = True
        script = script.decode('latin-1')
    elif isinstance(script, bytearray):
        is_bytes = 2
        script = script.decode('latin-1')
    elif not isinstance(script, str):
        raise TypeError("Unexpected type")

    return is_bytes, script


def jsmin_for_posers(script, keep_bang_comments=False):
    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 regexes. It's here for fun and may
              vanish any time. Use the `jsmin` function instead.

    Parameters:
      script (str):
        Script to minify

      keep_bang_comments (bool):
        Keep comments starting with an exclamation mark? (``/*!...*/``)

    Returns:
      str: Minified script
    """
    if not keep_bang_comments:
        rex = (
            r'([^\047"\140/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^'
            r'\r\n]|\r?\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^'
            r'\r\n]|\r?\n|\r)[^"\\\r\n]*)*")|(?:\140[^\140\\]*(?:\\(?:[^\r\n'
            r']|\r?\n|\r)[^\140\\]*)*\140))[^\047"\140/\000-\040]*)|(?<=[)])'
            r'(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+'
            r')*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\0'
            r'40]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*((?:/(?![\r\n/*])[^/'
            r'\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]'
            r'\r\n]*)*\]))[^/\\\[\r\n]*)*/[a-z]*))(?=(?:[\000-\011\013\014\0'
            r'16-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n'
            r']*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^'
            r'/*][^*]*\*+)*/))*)*\.(?:[\000-\011\013\014\016-\040]|(?:/\*[^*'
            r']*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\00'
            r'0-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)'
            r'*[a-z])|(?<=[(,=:\[!&|?{};\r\n+*-])(?:[\000-\011\013\014\016-'
            r'\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)'
            r'?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*]'
            r'[^*]*\*+)*/))*)*((?:/(?![\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|'
            r'(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*'
            r'/[a-z]*))((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/'
            r'*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013'
            r'\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000'
            r'-\040&)+,.:;=?\]|}-]))?|(?<=[\000-#%-,./:-@\[-^\140{-~-]return'
            r')(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*'
            r'+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013\014\016'
            r'-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*((?:/(?![\r\n/*])'
            r'[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^'
            r'\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/[a-z]*))((?:[\000-\011\013\014'
            r'\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r'
            r'\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:'
            r'[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[^\0'
            r'00-!#%&(*,./:-@\[\\^{|~])(?:[\000-\011\013\014\016-\040]|(?:/'
            r'\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))'
            r'(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+'
            r')*/))*)+(?=[^\000-\040"#%-\047)*,./:-@\\-^\140|-~])|(?<=[^\000'
            r'-#%-,./:-@\[-^\140{-~-])((?:[\000-\011\013\014\016-\040]|(?:/'
            r'\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^\000-#%-,./:-@\[-^\140{-'
            r'~-])|(?<=\+)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:'
            r'[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\013\014\016-\0'
            r'40]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\000-\011\0'
            r'13\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+|(?:(?:(?'
            r'://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]'
            r'*\*+(?:[^/*][^*]*\*+)*/))*)+'
        )

        def subber(match):
            """ Substitution callback """
            groups = match.groups()
            return (
                groups[0] or
                groups[1] or
                groups[2] or
                (groups[4] and (groups[3] + '\n')) or
                groups[3] or
                (groups[6] and "%s%s%s" % (
                    groups[5] and '\n' or '',
                    groups[6],
                    groups[7] and '\n' or '',
                )) or
                (groups[8] and '\n') or
                (groups[9] and ' ') or
                (groups[10] and ' ') or
                (groups[11] and ' ') or
                ''
            )
    else:
        rex = (
            r'([^\047"\140/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^'
            r'\r\n]|\r?\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^'
            r'\r\n]|\r?\n|\r)[^"\\\r\n]*)*")|(?:\140[^\140\\]*(?:\\(?:[^\r\n'
            r']|\r?\n|\r)[^\140\\]*)*\140))[^\047"\140/\000-\040]*)|(?<=[)])'
            r'((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*'
            r'+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-'
            r'\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*)((?:/(?![\r\n/*])'
            r'[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^'
            r'\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/[a-z]*))(?=(?:[\000-\011\013\0'
            r'14\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^'
            r'\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+('
            r'?:[^/*][^*]*\*+)*/))*)*\.(?:[\000-\011\013\014\016-\040]|(?:/'
            r'\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?'
            r':[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*'
            r'/))*)*[a-z])|(?<=[(,=:\[!&|?{};\r\n+*-])((?:[\000-\011\013\014'
            r'\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]*)*/[a-z]*))((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+'
            r'(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\01'
            r'1\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=['
            r'^\000-\040&)+,.:;=?\]|}-]))?|(?<=[\000-#%-,./:-@\[-^\140{-~-]r'
            r'eturn)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*]['
            r'^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013\0'
            r'14\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*)((?:/(?!['
            r'\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^'
            r'\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/[a-z]*))((?:[\000-\011'
            r'\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:('
            r'?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*'
            r']*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|'
            r'(?<=[^\000-!#%&(*,./:-@\[\\^{|~])((?:[\000-\011\013\014\016-\0'
            r'40]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?['
            r'\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^'
            r'*]*\*+)*/))*)+)(?=[^\000-\040"#%-\047)*,./:-@\\-^\140|-~])|(?<'
            r'=[^\000-#%-,./:-@\[-^\140{-~-])((?:[\000-\011\013\014\016-\040'
            r']|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+)(?=[^\000-#%-,./:-@\[-^'
            r'\140{-~-])|(?<=\+)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*'
            r'\*+(?:[^/*][^*]*\*+)*/))+)(?=\+)|(?<=-)((?:[\000-\011\013\014'
            r'\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+)(?=-)|((?:[\00'
            r'0-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+)'
            r'|((?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|'
            r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+)'
        )

        keep = _re.compile(
            r'[\000-\011\013\014\016-\040]+|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*'
            r'\*+)*/)+|(?:(?://[^\r\n]*)?[\r\n])+|((?:/\*![^*]*\*+(?:[^/*][^'
            r'*]*\*+)*/)+)'
        ).sub
        keeper = lambda m: m.groups()[0] or ''

        def subber(match):
            """ Substitution callback """
            groups = match.groups()
            return (
                groups[0] or
                groups[1] or
                groups[3] and "%s%s" % (
                    keep(keeper, groups[2]),
                    groups[3],
                ) or
                groups[5] and "%s%s%s%s" % (
                    keep(keeper, groups[4]),
                    groups[5],
                    keep(keeper, groups[6] or ''),
                    groups[6] and '\n' or '',
                ) or
                groups[9] and "%s%s%s%s%s" % (
                    keep(keeper, groups[7]),
                    groups[8] and '\n' or '',
                    groups[9],
                    keep(keeper, groups[10] or ''),
                    groups[10] and '\n' or '',
                ) or
                groups[11] and (keep(keeper, groups[11]) + '\n') or
                groups[12] and (keep(keeper, groups[12]) or ' ') or
                groups[13] and (keep(keeper, groups[13]) or ' ') or
                groups[14] and (keep(keeper, groups[14]) or ' ') or
                keep(keeper, groups[15] or groups[16])
            )

    is_bytes, script = _as_str(script)
    script = _re.sub(rex, subber, '\n%s\n' % script).strip()
    if is_bytes:
        script = script.encode('latin-1')
        if is_bytes == 2:
            script = bytearray(script)
    return script


if __name__ == '__main__':
    def main():
        """ Main """
        import sys as _sys

        argv = _sys.argv[1:]
        keep_bang_comments = '-b' in argv or '-bp' in argv or '-pb' in argv
        if '-p' in argv or '-bp' in argv or '-pb' in argv:
            xjsmin = _make_jsmin(python_only=True)
        else:
            xjsmin = jsmin

        _sys.stdout.write(xjsmin(
            _sys.stdin.read(), keep_bang_comments=keep_bang_comments
        ))

    main()