| #!/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) |