Initial import
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vendor/plugins/asset_packager/lib/jsmin.rb
vendored
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vendor/plugins/asset_packager/lib/jsmin.rb
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#!/usr/bin/ruby
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# jsmin.rb 2007-07-20
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# Author: Uladzislau Latynski
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# This work is a translation from C to Ruby of jsmin.c published by
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# Douglas Crockford. Permission is hereby granted to use the Ruby
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# version under the same conditions as the jsmin.c on which it is
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# based.
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#
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# /* jsmin.c
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# 2003-04-21
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#
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# Copyright (c) 2002 Douglas Crockford (www.crockford.com)
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
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# this software and associated documentation files (the "Software"), to deal in
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# the Software without restriction, including without limitation the rights to
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is furnished to do
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# so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# The Software shall be used for Good, not Evil.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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EOF = -1
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$theA = ""
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$theB = ""
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# isAlphanum -- return true if the character is a letter, digit, underscore,
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# dollar sign, or non-ASCII character
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def isAlphanum(c)
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return false if !c || c == EOF
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return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'Z') || c == '_' || c == '$' ||
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c == '\\' || c[0] > 126)
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end
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# get -- return the next character from stdin. Watch out for lookahead. If
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# the character is a control character, translate it to a space or linefeed.
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def get()
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c = $stdin.getc
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return EOF if(!c)
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c = c.chr
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return c if (c >= " " || c == "\n" || c.unpack("c") == EOF)
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return "\n" if (c == "\r")
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return " "
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end
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# Get the next character without getting it.
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def peek()
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lookaheadChar = $stdin.getc
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$stdin.ungetc(lookaheadChar)
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return lookaheadChar.chr
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end
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# mynext -- get the next character, excluding comments.
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# peek() is used to see if a '/' is followed by a '/' or '*'.
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def mynext()
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c = get
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if (c == "/")
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if(peek == "/")
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while(true)
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c = get
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if (c <= "\n")
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return c
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end
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end
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end
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if(peek == "*")
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get
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while(true)
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case get
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when "*"
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if (peek == "/")
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get
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return " "
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end
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when EOF
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raise "Unterminated comment"
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end
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end
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end
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end
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return c
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end
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# action -- do something! What you do is determined by the argument: 1
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# Output A. Copy B to A. Get the next B. 2 Copy B to A. Get the next B.
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# (Delete A). 3 Get the next B. (Delete B). action treats a string as a
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# single character. Wow! action recognizes a regular expression if it is
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# preceded by ( or , or =.
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def action(a)
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if(a==1)
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$stdout.write $theA
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end
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if(a==1 || a==2)
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$theA = $theB
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if ($theA == "\'" || $theA == "\"")
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while (true)
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$stdout.write $theA
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$theA = get
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break if ($theA == $theB)
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raise "Unterminated string literal" if ($theA <= "\n")
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if ($theA == "\\")
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$stdout.write $theA
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$theA = get
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end
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end
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end
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end
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if(a==1 || a==2 || a==3)
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$theB = mynext
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if ($theB == "/" && ($theA == "(" || $theA == "," || $theA == "=" ||
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$theA == ":" || $theA == "[" || $theA == "!" ||
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$theA == "&" || $theA == "|" || $theA == "?" ||
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$theA == "{" || $theA == "}" || $theA == ";" ||
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$theA == "\n"))
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$stdout.write $theA
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$stdout.write $theB
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while (true)
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$theA = get
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if ($theA == "/")
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break
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elsif ($theA == "\\")
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$stdout.write $theA
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$theA = get
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elsif ($theA <= "\n")
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raise "Unterminated RegExp Literal"
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end
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$stdout.write $theA
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end
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$theB = mynext
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end
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end
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end
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# jsmin -- Copy the input to the output, deleting the characters which are
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# insignificant to JavaScript. Comments will be removed. Tabs will be
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# replaced with spaces. Carriage returns will be replaced with linefeeds.
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# Most spaces and linefeeds will be removed.
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def jsmin
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$theA = "\n"
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action(3)
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while ($theA != EOF)
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case $theA
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when " "
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if (isAlphanum($theB))
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action(1)
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else
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action(2)
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end
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when "\n"
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case ($theB)
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when "{","[","(","+","-"
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action(1)
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when " "
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action(3)
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else
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if (isAlphanum($theB))
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action(1)
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else
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action(2)
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end
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end
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else
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case ($theB)
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when " "
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if (isAlphanum($theA))
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action(1)
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else
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action(3)
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end
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when "\n"
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case ($theA)
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when "}","]",")","+","-","\"","\\", "'", '"'
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action(1)
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else
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if (isAlphanum($theA))
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action(1)
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else
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action(3)
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end
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end
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else
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action(1)
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end
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end
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end
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end
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ARGV.each do |anArg|
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$stdout.write "// #{anArg}\n"
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end
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jsmin
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