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CSSMin History | |||
================================================================================ | |||
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Version 1.0.0 (2008-03-22) | |||
* First release. |
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#-- | |||
# Copyright (c) 2008 Ryan Grove <ryan@wonko.com> | |||
# All rights reserved. | |||
# | |||
# Redistribution and use in source and binary forms, with or without | |||
# modification, are permitted provided that the following conditions are met: | |||
# | |||
# * Redistributions of source code must retain the above copyright notice, | |||
# this list of conditions and the following disclaimer. | |||
# * Redistributions in binary form must reproduce the above copyright notice, | |||
# this list of conditions and the following disclaimer in the documentation | |||
# and/or other materials provided with the distribution. | |||
# * Neither the name of this project nor the names of its contributors may be | |||
# used to endorse or promote products derived from this software without | |||
# specific prior written permission. | |||
# | |||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |||
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |||
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE | |||
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |||
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |||
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |||
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |||
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||
#++ | |||
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require 'rubygems' | |||
require 'rake/gempackagetask' | |||
require 'rake/rdoctask' | |||
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thoth_gemspec = Gem::Specification.new do |s| | |||
s.rubyforge_project = 'riposte' | |||
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s.name = 'jsmin' | |||
s.version = '1.0.0' | |||
s.author = 'Ryan Grove' | |||
s.email = 'ryan@wonko.com' | |||
s.homepage = 'http://github.com/rgrove/jsmin/' | |||
s.platform = Gem::Platform::RUBY | |||
s.summary = "Ruby implementation of Douglas Crockford's JSMin JavaScript " + | |||
"minifier." | |||
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s.files = FileList['{lib}/**/*', 'HISTORY'].to_a | |||
s.require_path = 'lib' | |||
s.has_rdoc = true | |||
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s.required_ruby_version = '>= 1.8.6' | |||
end | |||
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Rake::GemPackageTask.new(thoth_gemspec) do |p| | |||
p.need_tar_gz = true | |||
end | |||
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Rake::RDocTask.new do |rd| | |||
rd.main = 'JSMin' | |||
rd.title = 'JSMin' | |||
rd.rdoc_dir = 'doc' | |||
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rd.rdoc_files.include('lib/**/*.rb') | |||
end |
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#-- | |||
# jsmin.rb - Ruby implementation of Douglas Crockford's JSMin. | |||
# | |||
# This is a port of jsmin.c, and is distributed under the same terms, which are | |||
# as follows: | |||
# | |||
# 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. | |||
#++ | |||
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require 'strscan' | |||
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# = JSMin | |||
# | |||
# Ruby implementation of Douglas Crockford's JavaScript minifier, JSMin. | |||
# | |||
# Author:: Ryan Grove (mailto:ryan@wonko.com) | |||
# Version:: 1.0.0 (2008-03-22) | |||
# Copyright:: Copyright (c) 2008 Ryan Grove. All rights reserved. | |||
# Website:: http://github.com/rgrove/jsmin/ | |||
# | |||
# == Example | |||
# | |||
# require 'rubygems' | |||
# require 'jsmin' | |||
# | |||
# File.open('example.js', 'r') {|file| puts JSMin.minify(file) } | |||
# | |||
module JSMin | |||
ORD_LF = "\n"[0].freeze | |||
ORD_SPACE = ' '[0].freeze | |||
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class << self | |||
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# Reads JavaScript from +input+ (which can be a String or an IO object) and | |||
# returns a String containing minified JS. | |||
def minify(input) | |||
@js = StringScanner.new(input.is_a?(IO) ? input.read : input.to_s) | |||
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@a = "\n" | |||
@b = nil | |||
@lookahead = nil | |||
@output = '' | |||
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action_get | |||
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while !@a.nil? do | |||
case @a | |||
when ' ' | |||
if alphanum?(@b) | |||
action_output | |||
else | |||
action_copy | |||
end | |||
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when "\n" | |||
if @b == ' ' | |||
action_get | |||
elsif @b =~ /[{\[\(+-]/ | |||
action_output | |||
else | |||
if alphanum?(@b) | |||
action_output | |||
else | |||
action_copy | |||
end | |||
end | |||
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else | |||
if @b == ' ' | |||
if alphanum?(@a) | |||
action_output | |||
else | |||
action_get | |||
end | |||
elsif @b == "\n" | |||
if @a =~ /[}\]\)\\"+-]/ | |||
action_output | |||
else | |||
if alphanum?(@a) | |||
action_output | |||
else | |||
action_get | |||
end | |||
end | |||
else | |||
action_output | |||
end | |||
end | |||
end | |||
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@output | |||
end | |||
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private | |||
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# Corresponds to action(1) in jsmin.c. | |||
def action_output | |||
@output << @a | |||
action_copy | |||
end | |||
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# Corresponds to action(2) in jsmin.c. | |||
def action_copy | |||
@a = @b | |||
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if @a == '\'' || @a == '"' | |||
loop do | |||
@output << @a | |||
@a = get | |||
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break if @a == @b | |||
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if @a[0] <= ORD_LF | |||
raise "JSMin parse error: unterminated string literal: #{@a}" | |||
end | |||
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if @a == '\\' | |||
@output << @a | |||
@a = get | |||
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if @a[0] <= ORD_LF | |||
raise "JSMin parse error: unterminated string literal: #{@a}" | |||
end | |||
end | |||
end | |||
end | |||
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action_get | |||
end | |||
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# Corresponds to action(3) in jsmin.c. | |||
def action_get | |||
@b = nextchar | |||
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if @b == '/' && (@a == "\n" || @a =~ /[\(,=:\[!&|?{};]/) | |||
@output << @a | |||
@output << @b | |||
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loop do | |||
@a = get | |||
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if @a == '/' | |||
break | |||
elsif @a == '\\' | |||
@output << @a | |||
@a = get | |||
elsif @a[0] <= ORD_LF | |||
raise "JSMin parse error: unterminated regular expression " + | |||
"literal: #{@a}" | |||
end | |||
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@output << @a | |||
end | |||
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@b = nextchar | |||
end | |||
end | |||
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# Returns true if +c+ is a letter, digit, underscore, dollar sign, | |||
# backslash, or non-ASCII character. | |||
def alphanum?(c) | |||
c.is_a?(String) && !c.empty? && (c[0] > 126 || c =~ /[0-9a-z_$\\]/i) | |||
end | |||
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# Returns the next character from the input. If the character is a control | |||
# character, it will be translated to a space or linefeed. | |||
def get | |||
c = @lookahead.nil? ? @js.getch : @lookahead | |||
@lookahead = nil | |||
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return c if c.nil? || c == "\n" || c[0] >= ORD_SPACE | |||
return "\n" if c == "\r" | |||
return ' ' | |||
end | |||
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# Gets the next character, excluding comments. | |||
def nextchar | |||
c = get | |||
return c unless c == '/' | |||
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case peek | |||
when '/' | |||
loop do | |||
c = get | |||
return c if c[0] <= ORD_LF | |||
end | |||
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when '*' | |||
get | |||
loop do | |||
case get | |||
when '*' | |||
if peek == '/' | |||
get | |||
return ' ' | |||
end | |||
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when nil | |||
raise 'JSMin parse error: unterminated comment' | |||
end | |||
end | |||
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else | |||
return c | |||
end | |||
end | |||
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# Gets the next character without getting it. | |||
def peek | |||
@lookahead = get | |||
end | |||
end | |||
end |
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