#!/usr/bin/ruby
# jsmin.rb 2007-07-20
# Author: Uladzislau Latynski
# 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.
EOF = -1
$theA = ""
$theB = ""
# isAlphanum -- return true if the character is a letter, digit, underscore,
# dollar sign, or non-ASCII character
def isAlphanum(c)
return false if !c || c == EOF
return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') || c == '_' || c == '$' ||
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 get()
c = $stdin.getc
return EOF if(!c)
c = c.chr
return c if (c >= " " || c == "\n" || c.unpack("c") == EOF)
return "\n" if (c == "\r")
return " "
end
# Get the next character without getting it.
def peek()
lookaheadChar = $stdin.getc
$stdin.ungetc(lookaheadChar)
return lookaheadChar.chr
end
# mynext -- get the next character, excluding comments.
# peek() is used to see if a '/' is followed by a '/' or '*'.
def 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 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 action(a)
if(a==1)
$stdout.write $theA
end
if(a==1 || a==2)
$theA = $theB
if ($theA == "\'" || $theA == "\"")
while (true)
$stdout.write $theA
$theA = get
break if ($theA == $theB)
raise "Unterminated string literal" if ($theA <= "\n")
if ($theA == "\\")
$stdout.write $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"))
$stdout.write $theA
$stdout.write $theB
while (true)
$theA = get
if ($theA == "/")
break
elsif ($theA == "\\")
$stdout.write $theA
$theA = get
elsif ($theA <= "\n")
raise "Unterminated RegExp Literal"
end
$stdout.write $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 jsmin
$theA = "\n"
action(3)
while ($theA != 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
end
ARGV.each do |anArg|
$stdout.write "// #{anArg}\n"
end
jsmin
