mirror of
https://github.com/nodejs/node.git
synced 2024-11-29 15:06:33 +01:00
219 lines
7.7 KiB
Python
219 lines
7.7 KiB
Python
#!/usr/bin/python
|
|
|
|
# This code is original from jsmin by Douglas Crockford, it was translated to
|
|
# Python by Baruch Even. The original code had the following copyright and
|
|
# license.
|
|
#
|
|
# /* jsmin.c
|
|
# 2007-05-22
|
|
#
|
|
# Copyright (c) 2002 Douglas Crockford (www.crockford.com)
|
|
#
|
|
# 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 shall be used for Good, not Evil.
|
|
#
|
|
# 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.
|
|
# */
|
|
|
|
from StringIO import StringIO
|
|
|
|
def jsmin(js):
|
|
ins = StringIO(js)
|
|
outs = StringIO()
|
|
JavascriptMinify().minify(ins, outs)
|
|
str = outs.getvalue()
|
|
if len(str) > 0 and str[0] == '\n':
|
|
str = str[1:]
|
|
return str
|
|
|
|
def isAlphanum(c):
|
|
"""return true if the character is a letter, digit, underscore,
|
|
dollar sign, or non-ASCII character.
|
|
"""
|
|
return ((c >= 'a' and c <= 'z') or (c >= '0' and c <= '9') or
|
|
(c >= 'A' and c <= 'Z') or c == '_' or c == '$' or c == '\\' or (c is not None and ord(c) > 126));
|
|
|
|
class UnterminatedComment(Exception):
|
|
pass
|
|
|
|
class UnterminatedStringLiteral(Exception):
|
|
pass
|
|
|
|
class UnterminatedRegularExpression(Exception):
|
|
pass
|
|
|
|
class JavascriptMinify(object):
|
|
|
|
def _outA(self):
|
|
self.outstream.write(self.theA)
|
|
def _outB(self):
|
|
self.outstream.write(self.theB)
|
|
|
|
def _get(self):
|
|
"""return the next character from stdin. Watch out for lookahead. If
|
|
the character is a control character, translate it to a space or
|
|
linefeed.
|
|
"""
|
|
c = self.theLookahead
|
|
self.theLookahead = None
|
|
if c == None:
|
|
c = self.instream.read(1)
|
|
if c >= ' ' or c == '\n':
|
|
return c
|
|
if c == '': # EOF
|
|
return '\000'
|
|
if c == '\r':
|
|
return '\n'
|
|
return ' '
|
|
|
|
def _peek(self):
|
|
self.theLookahead = self._get()
|
|
return self.theLookahead
|
|
|
|
def _next(self):
|
|
"""get the next character, excluding comments. peek() is used to see
|
|
if an unescaped '/' is followed by a '/' or '*'.
|
|
"""
|
|
c = self._get()
|
|
if c == '/' and self.theA != '\\':
|
|
p = self._peek()
|
|
if p == '/':
|
|
c = self._get()
|
|
while c > '\n':
|
|
c = self._get()
|
|
return c
|
|
if p == '*':
|
|
c = self._get()
|
|
while 1:
|
|
c = self._get()
|
|
if c == '*':
|
|
if self._peek() == '/':
|
|
self._get()
|
|
return ' '
|
|
if c == '\000':
|
|
raise UnterminatedComment()
|
|
|
|
return c
|
|
|
|
def _action(self, action):
|
|
"""do something! What you do is determined by the argument:
|
|
1 Output A. Copy B to A. Get the next B.
|
|
2 Copy B to A. Get the next B. (Delete A).
|
|
3 Get the next B. (Delete B).
|
|
action treats a string as a single character. Wow!
|
|
action recognizes a regular expression if it is preceded by ( or , or =.
|
|
"""
|
|
if action <= 1:
|
|
self._outA()
|
|
|
|
if action <= 2:
|
|
self.theA = self.theB
|
|
if self.theA == "'" or self.theA == '"':
|
|
while 1:
|
|
self._outA()
|
|
self.theA = self._get()
|
|
if self.theA == self.theB:
|
|
break
|
|
if self.theA <= '\n':
|
|
raise UnterminatedStringLiteral()
|
|
if self.theA == '\\':
|
|
self._outA()
|
|
self.theA = self._get()
|
|
|
|
|
|
if action <= 3:
|
|
self.theB = self._next()
|
|
if self.theB == '/' and (self.theA == '(' or self.theA == ',' or
|
|
self.theA == '=' or self.theA == ':' or
|
|
self.theA == '[' or self.theA == '?' or
|
|
self.theA == '!' or self.theA == '&' or
|
|
self.theA == '|' or self.theA == ';' or
|
|
self.theA == '{' or self.theA == '}' or
|
|
self.theA == '\n'):
|
|
self._outA()
|
|
self._outB()
|
|
while 1:
|
|
self.theA = self._get()
|
|
if self.theA == '/':
|
|
break
|
|
elif self.theA == '\\':
|
|
self._outA()
|
|
self.theA = self._get()
|
|
elif self.theA <= '\n':
|
|
raise UnterminatedRegularExpression()
|
|
self._outA()
|
|
self.theB = self._next()
|
|
|
|
|
|
def _jsmin(self):
|
|
"""Copy the input to the output, deleting the characters which are
|
|
insignificant to JavaScript. Comments will be removed. Tabs will be
|
|
replaced with spaces. Carriage returns will be replaced with linefeeds.
|
|
Most spaces and linefeeds will be removed.
|
|
"""
|
|
self.theA = '\n'
|
|
self._action(3)
|
|
|
|
while self.theA != '\000':
|
|
if self.theA == ' ':
|
|
if isAlphanum(self.theB):
|
|
self._action(1)
|
|
else:
|
|
self._action(2)
|
|
elif self.theA == '\n':
|
|
if self.theB in ['{', '[', '(', '+', '-']:
|
|
self._action(1)
|
|
elif self.theB == ' ':
|
|
self._action(3)
|
|
else:
|
|
if isAlphanum(self.theB):
|
|
self._action(1)
|
|
else:
|
|
self._action(2)
|
|
else:
|
|
if self.theB == ' ':
|
|
if isAlphanum(self.theA):
|
|
self._action(1)
|
|
else:
|
|
self._action(3)
|
|
elif self.theB == '\n':
|
|
if self.theA in ['}', ']', ')', '+', '-', '"', '\'']:
|
|
self._action(1)
|
|
else:
|
|
if isAlphanum(self.theA):
|
|
self._action(1)
|
|
else:
|
|
self._action(3)
|
|
else:
|
|
self._action(1)
|
|
|
|
def minify(self, instream, outstream):
|
|
self.instream = instream
|
|
self.outstream = outstream
|
|
self.theA = '\n'
|
|
self.theB = None
|
|
self.theLookahead = None
|
|
|
|
self._jsmin()
|
|
self.instream.close()
|
|
|
|
if __name__ == '__main__':
|
|
import sys
|
|
jsm = JavascriptMinify()
|
|
jsm.minify(sys.stdin, sys.stdout)
|