1 #!/usr/bin/env 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 # imports adjusted for speed (cStringIO) and python 3 (io) -- nd 34 try: 35 from cStringIO import StringIO 36 except ImportError: 37 try: 38 from StringIO import StringIO 39 except ImportError: 40 from io import StringIO 41 42 43 def jsmin(js): 44 ins = StringIO(js) 45 outs = StringIO() 46 JavascriptMinify().minify(ins, outs) 47 str = outs.getvalue() 48 if len(str) > 0 and str[0] == '\n': 49 str = str[1:] 50 return str 51 52 def isAlphanum(c): 53 """return true if the character is a letter, digit, underscore, 54 dollar sign, or non-ASCII character. 55 """ 56 return ((c >= 'a' and c <= 'z') or (c >= '0' and c <= '9') or 57 (c >= 'A' and c <= 'Z') or c == '_' or c == '$' or c == '\\' or (c is not None and ord(c) > 126)); 58 59 class UnterminatedComment(Exception): 60 pass 61 62 class UnterminatedStringLiteral(Exception): 63 pass 64 65 class UnterminatedRegularExpression(Exception): 66 pass 67 68 class JavascriptMinify(object): 69 70 def _outA(self): 71 self.outstream.write(self.theA) 72 def _outB(self): 73 self.outstream.write(self.theB) 74 75 def _get(self): 76 """return the next character from stdin. Watch out for lookahead. If 77 the character is a control character, translate it to a space or 78 linefeed. 79 """ 80 c = self.theLookahead 81 self.theLookahead = None 82 if c == None: 83 c = self.instream.read(1) 84 if c >= ' ' or c == '\n': 85 return c 86 if c == '': # EOF 87 return '\000' 88 if c == '\r': 89 return '\n' 90 return ' ' 91 92 def _peek(self): 93 self.theLookahead = self._get() 94 return self.theLookahead 95 96 def _next(self): 97 """get the next character, excluding comments. peek() is used to see 98 if an unescaped '/' is followed by a '/' or '*'. 99 """ 100 c = self._get() 101 if c == '/' and self.theA != '\\': 102 p = self._peek() 103 if p == '/': 104 c = self._get() 105 while c > '\n': 106 c = self._get() 107 return c 108 if p == '*': 109 c = self._get() 110 while 1: 111 c = self._get() 112 if c == '*': 113 if self._peek() == '/': 114 self._get() 115 return ' ' 116 if c == '\000': 117 raise UnterminatedComment() 118 119 return c 120 121 def _action(self, action): 122 """do something! What you do is determined by the argument: 123 1 Output A. Copy B to A. Get the next B. 124 2 Copy B to A. Get the next B. (Delete A). 125 3 Get the next B. (Delete B). 126 action treats a string as a single character. Wow! 127 action recognizes a regular expression if it is preceded by ( or , or =. 128 """ 129 if action <= 1: 130 self._outA() 131 132 if action <= 2: 133 self.theA = self.theB 134 if self.theA == "'" or self.theA == '"': 135 while 1: 136 self._outA() 137 self.theA = self._get() 138 if self.theA == self.theB: 139 break 140 if self.theA <= '\n': 141 raise UnterminatedStringLiteral() 142 if self.theA == '\\': 143 self._outA() 144 self.theA = self._get() 145 146 147 if action <= 3: 148 self.theB = self._next() 149 if self.theB == '/' and (self.theA == '(' or self.theA == ',' or 150 self.theA == '=' or self.theA == ':' or 151 self.theA == '[' or self.theA == '?' or 152 self.theA == '!' or self.theA == '&' or 153 self.theA == '|' or self.theA == ';' or 154 self.theA == '{' or self.theA == '}' or 155 self.theA == '\n'): 156 self._outA() 157 self._outB() 158 while 1: 159 self.theA = self._get() 160 if self.theA == '/': 161 break 162 elif self.theA == '\\': 163 self._outA() 164 self.theA = self._get() 165 elif self.theA <= '\n': 166 raise UnterminatedRegularExpression() 167 self._outA() 168 self.theB = self._next() 169 170 171 def _jsmin(self): 172 """Copy the input to the output, deleting the characters which are 173 insignificant to JavaScript. Comments will be removed. Tabs will be 174 replaced with spaces. Carriage returns will be replaced with linefeeds. 175 Most spaces and linefeeds will be removed. 176 """ 177 self.theA = '\n' 178 self._action(3) 179 180 while self.theA != '\000': 181 if self.theA == ' ': 182 if isAlphanum(self.theB): 183 self._action(1) 184 else: 185 self._action(2) 186 elif self.theA == '\n': 187 if self.theB in ['{', '[', '(', '+', '-']: 188 self._action(1) 189 elif self.theB == ' ': 190 self._action(3) 191 else: 192 if isAlphanum(self.theB): 193 self._action(1) 194 else: 195 self._action(2) 196 else: 197 if self.theB == ' ': 198 if isAlphanum(self.theA): 199 self._action(1) 200 else: 201 self._action(3) 202 elif self.theB == '\n': 203 if self.theA in ['}', ']', ')', '+', '-', '"', '\'']: 204 self._action(1) 205 else: 206 if isAlphanum(self.theA): 207 self._action(1) 208 else: 209 self._action(3) 210 else: 211 self._action(1) 212 213 def minify(self, instream, outstream): 214 self.instream = instream 215 self.outstream = outstream 216 self.theA = '\n' 217 self.theB = None 218 self.theLookahead = None 219 220 self._jsmin() 221 self.instream.close() 222 223 if __name__ == '__main__': 224 import sys 225 jsm = JavascriptMinify() 226 jsm.minify(sys.stdin, sys.stdout) 227
