| #!/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. |
| # */ |
| |
| # Import StringIO from either the StringIO module (Python 2.x) or the io module (Python 3.x). |
| try: |
| from StringIO import StringIO |
| except ImportError: |
| from io 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) |
