3 # This code is original from jsmin by Douglas Crockford, it was translated to
4 # Python by Baruch Even. The original code had the following copyright and
10 # Copyright (c) 2002 Douglas Crockford (www.crockford.com)
12 # Permission is hereby granted, free of charge, to any person obtaining a copy of
13 # this software and associated documentation files (the "Software"), to deal in
14 # the Software without restriction, including without limitation the rights to
15 # use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
16 # of the Software, and to permit persons to whom the Software is furnished to do
17 # so, subject to the following conditions:
19 # The above copyright notice and this permission notice shall be included in all
20 # copies or substantial portions of the Software.
22 # The Software shall be used for Good, not Evil.
24 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 from StringIO import StringIO
38 JavascriptMinify().minify(ins, outs)
40 if len(str) > 0 and str[0] == '\n':
45 """return true if the character is a letter, digit, underscore,
46 dollar sign, or non-ASCII character.
48 return ((c >= 'a' and c <= 'z') or (c >= '0' and c <= '9') or
49 (c >= 'A' and c <= 'Z') or c == '_' or c == '$' or c == '\\' or (c is not None and ord(c) > 126));
51 class UnterminatedComment(Exception):
54 class UnterminatedStringLiteral(Exception):
57 class UnterminatedRegularExpression(Exception):
60 class JavascriptMinify(object):
63 self.outstream.write(self.theA)
65 self.outstream.write(self.theB)
68 """return the next character from stdin. Watch out for lookahead. If
69 the character is a control character, translate it to a space or
73 self.theLookahead = None
75 c = self.instream.read(1)
76 if c >= ' ' or c == '\n':
85 self.theLookahead = self._get()
86 return self.theLookahead
89 """get the next character, excluding comments. peek() is used to see
90 if a '/' is followed by a '/' or '*'.
105 if self._peek() == '/':
109 raise UnterminatedComment()
113 def _action(self, action):
114 """do something! What you do is determined by the argument:
115 1 Output A. Copy B to A. Get the next B.
116 2 Copy B to A. Get the next B. (Delete A).
117 3 Get the next B. (Delete B).
118 action treats a string as a single character. Wow!
119 action recognizes a regular expression if it is preceded by ( or , or =.
125 self.theA = self.theB
126 if self.theA == "'" or self.theA == '"':
129 self.theA = self._get()
130 if self.theA == self.theB:
132 if self.theA <= '\n':
133 raise UnterminatedStringLiteral()
134 if self.theA == '\\':
136 self.theA = self._get()
140 self.theB = self._next()
141 if self.theB == '/' and (self.theA == '(' or self.theA == ',' or
142 self.theA == '=' or self.theA == ':' or
143 self.theA == '[' or self.theA == '?' or
144 self.theA == '!' or self.theA == '&' or
149 self.theA = self._get()
152 elif self.theA == '\\':
154 self.theA = self._get()
155 elif self.theA <= '\n':
156 raise UnterminatedRegularExpression()
158 self.theB = self._next()
162 """Copy the input to the output, deleting the characters which are
163 insignificant to JavaScript. Comments will be removed. Tabs will be
164 replaced with spaces. Carriage returns will be replaced with linefeeds.
165 Most spaces and linefeeds will be removed.
170 while self.theA != '\000':
172 if isAlphanum(self.theB):
176 elif self.theA == '\n':
177 if self.theB in ['{', '[', '(', '+', '-']:
179 elif self.theB == ' ':
182 if isAlphanum(self.theB):
188 if isAlphanum(self.theA):
192 elif self.theB == '\n':
193 if self.theA in ['}', ']', ')', '+', '-', '"', '\'']:
196 if isAlphanum(self.theA):
203 def minify(self, instream, outstream):
204 self.instream = instream
205 self.outstream = outstream
208 self.theLookahead = None
211 self.instream.close()
213 if __name__ == '__main__':
215 jsm = JavascriptMinify()
216 jsm.minify(sys.stdin, sys.stdout)