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degitting jsmin

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Chris Anderson 2008-06-02 12:21:48 -07:00
parent 01291501a6
commit b2765a5309
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Subproject commit 0fe02780efec76e8ab83919beb6e0d82d53be4d9

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CSSMin History
================================================================================
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.
#++
require 'rubygems'
require 'rake/gempackagetask'
require 'rake/rdoctask'
thoth_gemspec = Gem::Specification.new do |s|
s.rubyforge_project = 'riposte'
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."
s.files = FileList['{lib}/**/*', 'HISTORY'].to_a
s.require_path = 'lib'
s.has_rdoc = true
s.required_ruby_version = '>= 1.8.6'
end
Rake::GemPackageTask.new(thoth_gemspec) do |p|
p.need_tar_gz = true
end
Rake::RDocTask.new do |rd|
rd.main = 'JSMin'
rd.title = 'JSMin'
rd.rdoc_dir = 'doc'
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.
#++
require 'strscan'
# = 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
class << self
# 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)
@a = "\n"
@b = nil
@lookahead = nil
@output = ''
action_get
while !@a.nil? do
case @a
when ' '
if alphanum?(@b)
action_output
else
action_copy
end
when "\n"
if @b == ' '
action_get
elsif @b =~ /[{\[\(+-]/
action_output
else
if alphanum?(@b)
action_output
else
action_copy
end
end
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
@output
end
private
# Corresponds to action(1) in jsmin.c.
def action_output
@output << @a
action_copy
end
# Corresponds to action(2) in jsmin.c.
def action_copy
@a = @b
if @a == '\'' || @a == '"'
loop do
@output << @a
@a = get
break if @a == @b
if @a[0] <= ORD_LF
raise "JSMin parse error: unterminated string literal: #{@a}"
end
if @a == '\\'
@output << @a
@a = get
if @a[0] <= ORD_LF
raise "JSMin parse error: unterminated string literal: #{@a}"
end
end
end
end
action_get
end
# Corresponds to action(3) in jsmin.c.
def action_get
@b = nextchar
if @b == '/' && (@a == "\n" || @a =~ /[\(,=:\[!&|?{};]/)
@output << @a
@output << @b
loop do
@a = get
if @a == '/'
break
elsif @a == '\\'
@output << @a
@a = get
elsif @a[0] <= ORD_LF
raise "JSMin parse error: unterminated regular expression " +
"literal: #{@a}"
end
@output << @a
end
@b = nextchar
end
end
# 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
# 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
return c if c.nil? || c == "\n" || c[0] >= ORD_SPACE
return "\n" if c == "\r"
return ' '
end
# Gets the next character, excluding comments.
def nextchar
c = get
return c unless c == '/'
case peek
when '/'
loop do
c = get
return c if c[0] <= ORD_LF
end
when '*'
get
loop do
case get
when '*'
if peek == '/'
get
return ' '
end
when nil
raise 'JSMin parse error: unterminated comment'
end
end
else
return c
end
end
# Gets the next character without getting it.
def peek
@lookahead = get
end
end
end

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/* jsmin.c
2007-12-04
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.
*/
#include <stdlib.h>
#include <stdio.h>
static int theA;
static int theB;
static int theLookahead = EOF;
/* isAlphanum -- return true if the character is a letter, digit, underscore,
dollar sign, or non-ASCII character.
*/
static int
isAlphanum(int c)
{
return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') || c == '_' || c == '$' || c == '\\' ||
c > 126);
}
/* 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.
*/
static int
get()
{
int c = theLookahead;
theLookahead = EOF;
if (c == EOF) {
c = getc(stdin);
}
if (c >= ' ' || c == '\n' || c == EOF) {
return c;
}
if (c == '\r') {
return '\n';
}
return ' ';
}
/* peek -- get the next character without getting it.
*/
static int
peek()
{
theLookahead = get();
return theLookahead;
}
/* next -- get the next character, excluding comments. peek() is used to see
if a '/' is followed by a '/' or '*'.
*/
static int
next()
{
int c = get();
if (c == '/') {
switch (peek()) {
case '/':
for (;;) {
c = get();
if (c <= '\n') {
return c;
}
}
case '*':
get();
for (;;) {
switch (get()) {
case '*':
if (peek() == '/') {
get();
return ' ';
}
break;
case EOF:
fprintf(stderr, "Error: JSMIN Unterminated comment.\n");
exit(1);
}
}
default:
return c;
}
}
return c;
}
/* 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 =.
*/
static void
action(int d)
{
switch (d) {
case 1:
putc(theA, stdout);
case 2:
theA = theB;
if (theA == '\'' || theA == '"') {
for (;;) {
putc(theA, stdout);
theA = get();
if (theA == theB) {
break;
}
if (theA <= '\n') {
fprintf(stderr,
"Error: JSMIN unterminated string literal: %c\n", theA);
exit(1);
}
if (theA == '\\') {
putc(theA, stdout);
theA = get();
if (theA <= '\n') {
fprintf(stderr,
"Error: JSMIN unterminated string literal: %c\n", '\\');
exit(1);
}
}
}
}
case 3:
theB = next();
if (theB == '/' && (theA == '(' || theA == ',' || theA == '=' ||
theA == ':' || theA == '[' || theA == '!' ||
theA == '&' || theA == '|' || theA == '?' ||
theA == '{' || theA == '}' || theA == ';' ||
theA == '\n')) {
putc(theA, stdout);
putc(theB, stdout);
for (;;) {
theA = get();
if (theA == '/') {
break;
} else if (theA =='\\') {
putc(theA, stdout);
theA = get();
} else if (theA <= '\n') {
fprintf(stderr,
"Error: JSMIN unterminated Regular Expression literal.\n", theA);
exit(1);
}
putc(theA, stdout);
}
theB = next();
}
}
}
/* 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.
*/
static void
jsmin()
{
theA = '\n';
action(3);
while (theA != EOF) {
switch (theA) {
case ' ':
if (isAlphanum(theB)) {
action(1);
} else {
action(2);
}
break;
case '\n':
switch (theB) {
case '{':
case '[':
case '(':
case '+':
case '-':
action(1);
break;
case ' ':
action(3);
break;
default:
if (isAlphanum(theB)) {
action(1);
} else {
action(2);
}
}
break;
default:
switch (theB) {
case ' ':
if (isAlphanum(theA)) {
action(1);
break;
}
action(3);
break;
case '\n':
switch (theA) {
case '}':
case ']':
case ')':
case '+':
case '-':
case '"':
case '\'':
action(1);
break;
default:
if (isAlphanum(theA)) {
action(1);
} else {
action(3);
}
}
break;
default:
action(1);
break;
}
}
}
}
/* main -- Output any command line arguments as comments
and then minify the input.
*/
extern int
main(int argc, char* argv[])
{
int i;
for (i = 1; i < argc; i += 1) {
fprintf(stdout, "// %s\n", argv[i]);
}
jsmin();
return 0;
}

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require '../lib/jsmin'
File.open('jslint.js', 'r') do |input|
File.open('out-ruby.js', 'w') {|output| output << JSMin.minify(input) }
end