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August 25, 2008 23:02
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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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