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jsminlib.rb
Ruby
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# jsminlib.rb 2007-12-29
# Author: David Troy <dave@popvox.com>
# Based directly on jsmin.rb by Uladzislau Latynski
# Converted to use the JSMin class and the minimize method rathert han
# stdin/stdout
#
# This work is a translation from C to Ruby of jsmin.c published by
# Douglas Crockford. Permission is hereby granted to use the Ruby
# version under the same conditions as the jsmin.c on which it is
# based.
#
# /* jsmin.c
# 2003-04-21
#
# 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.
 
class JSMin
EOF = -1
 
# isAlphanum -- return true if the character is a letter, digit, underscore,
# dollar sign, or non-ASCII character
def self.isAlphanum(c)
return false if !c || c == JSMin::EOF
return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') || c == '_' || c == '$' ||
c == '\\' || c[0] > 126)
end
 
# get -- return the next character from stdin. Watch out for lookahead. If
# the character is a control character, translate it to a space or linefeed.
def self.get()
return JSMin::EOF if @@current>(@@text.length-1)
c = @@text[@@current]
@@current += 1
c = c.chr
return c if (c >= " " || c == "\n" || c.unpack("c") == JSMin::EOF)
return "\n" if (c == "\r")
return " "
end
 
# Get the next character without getting it.
def self.peek()
lookaheadChar = @@text[@@current]
return lookaheadChar.chr
end
 
# mynext -- get the next character, excluding comments.
# peek() is used to see if a '/' is followed by a '/' or '*'.
def self.mynext()
c = get
if (c == "/")
if(peek == "/")
while(true)
c = get
if (c <= "\n")
return c
end
end
end
if(peek == "*")
get
while(true)
case get
when "*"
if (peek == "/")
get
return " "
end
when JSMin::EOF
raise "Unterminated comment"
end
end
end
end
return c
end
 
 
# 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 =.
def self.action(a)
if(a==1)
@@output << @@theA
end
if(a==1 || a==2)
@@theA = @@theB
if (@@theA == "\'" || @@theA == "\"")
while (true)
@@output << @@theA
@@theA = get
break if (@@theA == @@theB)
raise "Unterminated string literal" if (@@theA <= "\n")
if (@@theA == "\\")
@@output << @@theA
@@theA = get
end
end
end
end
if(a==1 || a==2 || a==3)
@@theB = mynext
if (@@theB == "/" && (@@theA == "(" || @@theA == "," || @@theA == "=" ||
@@theA == ":" || @@theA == "[" || @@theA == "!" ||
@@theA == "&" || @@theA == "|" || @@theA == "?" ||
@@theA == "{" || @@theA == "}" || @@theA == ";" ||
@@theA == "\n"))
@@output << @@theA
@@output << @@theB
while (true)
@@theA = get
if (@@theA == "/")
break
elsif (@@theA == "\\")
@@output << @@theA
@@theA = get
elsif (@@theA <= "\n")
raise "Unterminated RegExp Literal" + @@output
end
@@output << @@theA
end
@@theB = mynext
end
end
end
 
# jsmin -- 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.
def self.minimize(jstext)
@@theA = ""
@@theB = ""
@@current = 0
@@output = ""
 
@@text = jstext
@@theA = "\n"
action(3)
while (@@theA != JSMin::EOF)
case @@theA
when " "
if (isAlphanum(@@theB))
action(1)
else
action(2)
end
when "\n"
case (@@theB)
when "{","[","(","+","-"
action(1)
when " "
action(3)
else
if (isAlphanum(@@theB))
action(1)
else
action(2)
end
end
else
case (@@theB)
when " "
if (isAlphanum(@@theA))
action(1)
else
action(3)
end
when "\n"
case (@@theA)
when "}","]",")","+","-","\"","\\", "'", '"'
action(1)
else
if (isAlphanum(@@theA))
action(1)
else
action(3)
end
end
else
action(1)
end
end
end
@@output
end
 
end

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