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10e6b20a » dbertram
2012-04-04 Initial WebPutty open-sourcery
1 #!/usr/bin/python
2
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
5 # license.
6 #
7 # /* jsmin.c
8 # 2007-05-22
9 #
10 # Copyright (c) 2002 Douglas Crockford (www.crockford.com)
11 #
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:
18 #
19 # The above copyright notice and this permission notice shall be included in all
20 # copies or substantial portions of the Software.
21 #
22 # The Software shall be used for Good, not Evil.
23 #
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
30 # SOFTWARE.
31 # */
32
33 from StringIO import StringIO
34
35 def jsmin(js):
36 ins = StringIO(js)
37 outs = StringIO()
38 JavascriptMinify().minify(ins, outs)
39 str = outs.getvalue()
40 if len(str) > 0 and str[0] == '\n':
41 str = str[1:]
42 return str
43
44 def isAlphanum(c):
45 """return true if the character is a letter, digit, underscore,
46 dollar sign, or non-ASCII character.
47 """
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));
50
51 class UnterminatedComment(Exception):
52 pass
53
54 class UnterminatedStringLiteral(Exception):
55 pass
56
57 class UnterminatedRegularExpression(Exception):
58 pass
59
60 class JavascriptMinify(object):
61
62 def _outA(self):
63 self.outstream.write(self.theA)
64 def _outB(self):
65 self.outstream.write(self.theB)
66
67 def _get(self):
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
70 linefeed.
71 """
72 c = self.theLookahead
73 self.theLookahead = None
74 if c == None:
75 c = self.instream.read(1)
76 if c >= ' ' or c == '\n':
77 return c
78 if c == '': # EOF
79 return '\000'
80 if c == '\r':
81 return '\n'
82 return ' '
83
84 def _peek(self):
85 self.theLookahead = self._get()
86 return self.theLookahead
87
88 def _next(self):
89 """get the next character, excluding comments. peek() is used to see
90 if a '/' is followed by a '/' or '*'.
91 """
92 c = self._get()
93 if c == '/':
94 p = self._peek()
95 if p == '/':
96 c = self._get()
97 while c > '\n':
98 c = self._get()
99 return c
100 if p == '*':
101 c = self._get()
102 while 1:
103 c = self._get()
104 if c == '*':
105 if self._peek() == '/':
106 self._get()
107 return ' '
108 if c == '\000':
109 raise UnterminatedComment()
110
111 return c
112
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 =.
120 """
121 if action <= 1:
122 self._outA()
123
124 if action <= 2:
125 self.theA = self.theB
126 if self.theA == "'" or self.theA == '"':
127 while 1:
128 self._outA()
129 self.theA = self._get()
130 if self.theA == self.theB:
131 break
132 if self.theA <= '\n':
133 raise UnterminatedStringLiteral()
134 if self.theA == '\\':
135 self._outA()
136 self.theA = self._get()
137
138
139 if action <= 3:
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
145 self.theA == '|' or self.theA == ';' or
146 self.theA == '{' or self.theA == '}' or
147 self.theA == '\n'):
148 self._outA()
149 self._outB()
150 while 1:
151 self.theA = self._get()
152 if self.theA == '/':
153 break
154 elif self.theA == '\\':
155 self._outA()
156 self.theA = self._get()
157 elif self.theA <= '\n':
158 raise UnterminatedRegularExpression()
159 self._outA()
160 self.theB = self._next()
161
162
163 def _jsmin(self):
164 """Copy the input to the output, deleting the characters which are
165 insignificant to JavaScript. Comments will be removed. Tabs will be
166 replaced with spaces. Carriage returns will be replaced with linefeeds.
167 Most spaces and linefeeds will be removed.
168 """
169 self.theA = '\n'
170 self._action(3)
171
172 while self.theA != '\000':
173 if self.theA == ' ':
174 if isAlphanum(self.theB):
175 self._action(1)
176 else:
177 self._action(2)
178 elif self.theA == '\n':
179 if self.theB in ['{', '[', '(', '+', '-']:
180 self._action(1)
181 elif self.theB == ' ':
182 self._action(3)
183 else:
184 if isAlphanum(self.theB):
185 self._action(1)
186 else:
187 self._action(2)
188 else:
189 if self.theB == ' ':
190 if isAlphanum(self.theA):
191 self._action(1)
192 else:
193 self._action(3)
194 elif self.theB == '\n':
195 if self.theA in ['}', ']', ')', '+', '-', '"', '\'']:
196 self._action(1)
197 else:
198 if isAlphanum(self.theA):
199 self._action(1)
200 else:
201 self._action(3)
202 else:
203 self._action(1)
204
205 def minify(self, instream, outstream):
206 self.instream = instream
207 self.outstream = outstream
208 self.theA = '\n'
209 self.theB = None
210 self.theLookahead = None
211
212 self._jsmin()
213 self.instream.close()
214
215 if __name__ == '__main__':
216 import sys
217 jsm = JavascriptMinify()
218 jsm.minify(sys.stdin, sys.stdout)
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