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Diffstat (limited to 'misc/openlayers/tools/jsmin.py')
| -rwxr-xr-x | misc/openlayers/tools/jsmin.py | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/misc/openlayers/tools/jsmin.py b/misc/openlayers/tools/jsmin.py new file mode 100755 index 0000000..d188790 --- /dev/null +++ b/misc/openlayers/tools/jsmin.py @@ -0,0 +1,216 @@ +#!/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 +# 2007-01-08 +# +# 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 a '/' is followed by a '/' or '*'. + """ + c = self._get() + if c == '/': + 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 == '|'): + 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 = None + self.thaB = None + self.theLookahead = None + + self._jsmin() + self.instream.close() + +if __name__ == '__main__': + import sys + jsm = JavascriptMinify() + jsm.minify(sys.stdin, sys.stdout) |