mirror of
https://github.com/kovidgoyal/calibre.git
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219 lines
7.7 KiB
Python
219 lines
7.7 KiB
Python
#!/usr/bin/python
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# This code is original from jsmin by Douglas Crockford, it was translated to
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# Python by Baruch Even. The original code had the following copyright and
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# license.
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#
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# /* jsmin.c
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# 2007-05-22
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#
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# Copyright (c) 2002 Douglas Crockford (www.crockford.com)
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
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# this software and associated documentation files (the "Software"), to deal in
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# the Software without restriction, including without limitation the rights to
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is furnished to do
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# so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# The Software shall be used for Good, not Evil.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# */
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from StringIO import StringIO
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def jsmin(js):
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ins = StringIO(js)
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outs = StringIO()
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JavascriptMinify().minify(ins, outs)
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str = outs.getvalue()
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if len(str) > 0 and str[0] == '\n':
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str = str[1:]
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return str
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def isAlphanum(c):
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"""return true if the character is a letter, digit, underscore,
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dollar sign, or non-ASCII character.
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"""
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return ((c >= 'a' and c <= 'z') or (c >= '0' and c <= '9') or
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(c >= 'A' and c <= 'Z') or c == '_' or c == '$' or c == '\\' or (c is not None and ord(c) > 126));
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class UnterminatedComment(Exception):
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pass
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class UnterminatedStringLiteral(Exception):
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pass
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class UnterminatedRegularExpression(Exception):
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pass
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class JavascriptMinify(object):
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def _outA(self):
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self.outstream.write(self.theA)
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def _outB(self):
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self.outstream.write(self.theB)
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def _get(self):
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"""return the next character from stdin. Watch out for lookahead. If
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the character is a control character, translate it to a space or
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linefeed.
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"""
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c = self.theLookahead
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self.theLookahead = None
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if c == None:
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c = self.instream.read(1)
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if c >= ' ' or c == '\n':
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return c
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if c == '': # EOF
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return '\000'
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if c == '\r':
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return '\n'
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return ' '
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def _peek(self):
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self.theLookahead = self._get()
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return self.theLookahead
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def _next(self):
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"""get the next character, excluding comments. peek() is used to see
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if an unescaped '/' is followed by a '/' or '*'.
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"""
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c = self._get()
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if c == '/' and self.theA != '\\':
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p = self._peek()
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if p == '/':
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c = self._get()
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while c > '\n':
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c = self._get()
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return c
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if p == '*':
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c = self._get()
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while 1:
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c = self._get()
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if c == '*':
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if self._peek() == '/':
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self._get()
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return ' '
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if c == '\000':
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raise UnterminatedComment()
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return c
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def _action(self, action):
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"""do something! What you do is determined by the argument:
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1 Output A. Copy B to A. Get the next B.
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2 Copy B to A. Get the next B. (Delete A).
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3 Get the next B. (Delete B).
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action treats a string as a single character. Wow!
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action recognizes a regular expression if it is preceded by ( or , or =.
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"""
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if action <= 1:
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self._outA()
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if action <= 2:
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self.theA = self.theB
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if self.theA == "'" or self.theA == '"':
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while 1:
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self._outA()
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self.theA = self._get()
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if self.theA == self.theB:
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break
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if self.theA <= '\n':
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raise UnterminatedStringLiteral()
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if self.theA == '\\':
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self._outA()
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self.theA = self._get()
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if action <= 3:
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self.theB = self._next()
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if self.theB == '/' and (self.theA == '(' or self.theA == ',' or
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self.theA == '=' or self.theA == ':' or
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self.theA == '[' or self.theA == '?' or
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self.theA == '!' or self.theA == '&' or
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self.theA == '|' or self.theA == ';' or
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self.theA == '{' or self.theA == '}' or
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self.theA == '\n'):
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self._outA()
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self._outB()
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while 1:
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self.theA = self._get()
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if self.theA == '/':
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break
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elif self.theA == '\\':
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self._outA()
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self.theA = self._get()
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elif self.theA <= '\n':
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raise UnterminatedRegularExpression()
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self._outA()
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self.theB = self._next()
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def _jsmin(self):
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"""Copy the input to the output, deleting the characters which are
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insignificant to JavaScript. Comments will be removed. Tabs will be
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replaced with spaces. Carriage returns will be replaced with linefeeds.
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Most spaces and linefeeds will be removed.
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"""
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self.theA = '\n'
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self._action(3)
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while self.theA != '\000':
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if self.theA == ' ':
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if isAlphanum(self.theB):
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self._action(1)
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else:
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self._action(2)
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elif self.theA == '\n':
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if self.theB in ['{', '[', '(', '+', '-']:
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self._action(1)
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elif self.theB == ' ':
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self._action(3)
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else:
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if isAlphanum(self.theB):
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self._action(1)
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else:
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self._action(2)
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else:
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if self.theB == ' ':
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if isAlphanum(self.theA):
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self._action(1)
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else:
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self._action(3)
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elif self.theB == '\n':
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if self.theA in ['}', ']', ')', '+', '-', '"', '\'']:
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self._action(1)
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else:
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if isAlphanum(self.theA):
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self._action(1)
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else:
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self._action(3)
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else:
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self._action(1)
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def minify(self, instream, outstream):
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self.instream = instream
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self.outstream = outstream
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self.theA = '\n'
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self.theB = None
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self.theLookahead = None
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self._jsmin()
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self.instream.close()
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if __name__ == '__main__':
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import sys
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jsm = JavascriptMinify()
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jsm.minify(sys.stdin, sys.stdout)
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