WebKit/Source/JavaScriptCore/Scripts/jsmin.py at main · WebKit/WebKit · GitHub

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# This code is original from jsmin by Douglas Crockford, it was translated to

# Python by Baruch Even. It was rewritten by Dave St.Germain for speed.

# The MIT License (MIT)

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

# THE SOFTWARE.

import sys

import io

python_text_type = str

__all__ = ['jsmin', 'JavascriptMinify']

__version__ = '2.0.9'

def jsmin(js):

"""

returns a minified version of the javascript string

"""

klass = io.StringIO

ins = klass(js)

outs = klass()

JavascriptMinify(ins, outs).minify()

return outs.getvalue()

class JavascriptMinify(object):

"""

Minify an input stream of javascript, writing

to an output stream

"""

def __init__(self, instream=None, outstream=None):

self.ins = instream

self.outs = outstream

def minify(self, instream=None, outstream=None):

if instream and outstream:

self.ins, self.outs = instream, outstream

self.is_return = False

self.return_buf = ''

def write(char):

# all of this is to support literal regular expressions.

# sigh

if str(char) in 'return':

self.return_buf += char

self.is_return = self.return_buf == 'return'

self.outs.write(char)

if self.is_return:

self.return_buf = ''

def read(n):

char = self.ins.read(n)

if not isinstance(char, python_text_type):

raise ValueError("ERROR: The script jsmin.py can only handle text input, but it received input of type %s" % type(char))

return char

space_strings = "abcdefghijklmnopqrstuvwxyz"\

"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$\\"

starters, enders = '{[(+-', '}])+-"\''

newlinestart_strings = starters + space_strings

newlineend_strings = enders + space_strings

do_newline = False

do_space = False

escape_slash_count = 0

doing_single_comment = False

previous_before_comment = ''

doing_multi_comment = False

in_re = False

in_quote = ''

quote_buf = []

previous = read(1)

if previous == '\\':

escape_slash_count += 1

next1 = read(1)

if previous == '/':

if next1 == '/':

doing_single_comment = True

elif next1 == '*':

doing_multi_comment = True

previous = next1

next1 = read(1)

else:

write(previous)

elif not previous:

return

elif str(previous) >= "!":

if str(previous) in "'\"":

in_quote = previous

write(previous)

previous_non_space = previous

else:

previous_non_space = ' '

if not next1:

return

while 1:

next2 = read(1)

if not next2:

last = next1.strip()

if not (doing_single_comment or doing_multi_comment)\

and last not in ('', '/'):

if in_quote:

write(''.join(quote_buf))

write(last)

break

if doing_multi_comment:

if next1 == '*' and next2 == '/':

doing_multi_comment = False

next2 = read(1)

elif doing_single_comment:

if next1 in '\r\n':

doing_single_comment = False

while next2 in '\r\n':

next2 = read(1)

if not next2:

break

if previous_before_comment in ')}]':

do_newline = True

elif previous_before_comment in space_strings:

write('\n')

elif in_quote:

quote_buf.append(next1)

if next1 == in_quote:

numslashes = 0

for c in reversed(quote_buf[:-1]):

if c != '\\':

break

else:

numslashes += 1

if numslashes % 2 == 0:

in_quote = ''

write(''.join(quote_buf))

elif str(next1) in '\r\n':

if previous_non_space in newlineend_strings \

or previous_non_space > '~':

while 1:

if next2 < '!':

next2 = read(1)

if not next2:

break

else:

if next2 in newlinestart_strings \

or next2 > '~' or next2 == '/':

do_newline = True

break

elif str(next1) < '!' and not in_re:

if (previous_non_space in space_strings \

or previous_non_space > '~') \

and (next2 in space_strings or next2 > '~'):

do_space = True

elif previous_non_space in '-+' and next2 == previous_non_space:

# protect against + ++ or - -- sequences

do_space = True

elif self.is_return and next2 == '/':

# returning a regex...

write(' ')

elif next1 == '/':

if do_space:

write(' ')

if in_re:

if previous != '\\' or (not escape_slash_count % 2) or next2 in 'gimy':

in_re = False

write('/')

elif next2 == '/':

doing_single_comment = True

previous_before_comment = previous_non_space

elif next2 == '*':

doing_multi_comment = True

previous = next1

next1 = next2

next2 = read(1)

else:

in_re = previous_non_space in '(,=:[?!&|' or self.is_return # literal regular expression

write('/')

else:

if do_space:

do_space = False

write(' ')

if do_newline:

write('\n')

do_newline = False

write(next1)

if not in_re and str(next1) in "'\"`":

in_quote = next1

quote_buf = []

previous = next1

next1 = next2

if str(previous) >= '!':

previous_non_space = previous

if previous == '\\':

escape_slash_count += 1

else:

escape_slash_count = 0

if __name__ == '__main__':

minifier = JavascriptMinify(sys.stdin, sys.stdout)

minifier.minify()

sys.stdout.write('\n')

WebKit/Source/JavaScriptCore/Scripts/jsmin.py at main · WebKit/WebKit · GitHub

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