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https://github.com/paolochiodi/htmlcompressor

A work in progress port of google's htmlcompressor.jar
https://github.com/paolochiodi/htmlcompressor

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A work in progress port of google's htmlcompressor.jar

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README 

        
# Htmlcompressor

[![Build Status](https://travis-ci.org/paolochiodi/htmlcompressor.svg?branch=master)](https://travis-ci.org/paolochiodi/htmlcompressor)



## Put your html on a diet



Htmlcompressor provides tools to minify html code.

It includes

- HtmlCompressor::Compressor class which is a raw port of [google's htmlcompressor](http://code.google.com/p/htmlcompressor/)

- HtmlCompressor::Rack a rack middleware to compress html pages on the fly.

Beware that the compressor has proved to be too slow in many circunstances to be used for on the fly or real time execution. I encourage you to use it only for build-time optimisations or decrease the number of optimisations that are run at execution time.



Please note that Htmlcompressor is still in alpha version and need some additional love.



## Usage



Using the compressor class is straightforward:



```ruby

  compressor = HtmlCompressor::Compressor.new

  compressor.compress('
')

```



The compressor ships with basic and safe default options that may be overwritten passing the options hash to the constructor:



```ruby

options = {

  :enabled => true,

  :remove_spaces_inside_tags => true,

  :remove_multi_spaces => true,

  :remove_comments => true,

  :remove_intertag_spaces => false,

  :remove_quotes => false,

  :compress_css => false,

  :compress_javascript => false,

  :simple_doctype => false,

  :remove_script_attributes => false,

  :remove_style_attributes => false,

  :remove_link_attributes => false,

  :remove_form_attributes => false,

  :remove_input_attributes => false,

  :remove_javascript_protocol => false,

  :remove_http_protocol => false,

  :remove_https_protocol => false,

  :preserve_line_breaks => false,

  :simple_boolean_attributes => false,

  :compress_js_templates => false

}

```



Htmlcompressor also ships a rack middleware that can be used with rails, sinatra or rack.



**However keep in mind that compression is slow (especially when also compressing javascript or css) and can negatively impact the performance of your website. Take your measurements and adopt a different strategy if necessary**



Using rack middleware (in rails) is as easy as:



```ruby

config.middleware.use HtmlCompressor::Rack, options

```



And in sinatra:



```ruby

use HtmlCompressor::Rack, options

```



The middleware uses a little more aggressive options by default:



```ruby

options = {

  :enabled => true,

  :remove_multi_spaces => true,

  :remove_comments => true,

  :remove_intertag_spaces => false,

  :remove_quotes => true,

  :compress_css => false,

  :compress_javascript => false,

  :simple_doctype => false,

  :remove_script_attributes => true,

  :remove_style_attributes => true,

  :remove_link_attributes => true,

  :remove_form_attributes => false,

  :remove_input_attributes => true,

  :remove_javascript_protocol => true,

  :remove_http_protocol => false,

  :remove_https_protocol => false,

  :preserve_line_breaks => false,

  :simple_boolean_attributes => true

}

```



Rails 2.3 users may need to add

```ruby

require 'htmlcompressor'

```



## Javascript template compression



You can compress javascript templates that are present in the html.

Setting the `:compress_js_templates` options to `true` will by default compress the content of script tags marked with `type="text/x-jquery-tmpl"`.

For compressing other types of templates, you can pass a string (or an array of strings) containing the type: `:compress_js_templates => ['text/html']`.

Please note that activating template compression will disable the removal of quotes from attributes values, as this could lead to unexpected errors with compiled templates.



## Custom preservation rules



If you need to define custom preservation rules, you can list regular expressions in the `preserve_patterns` option. For example, to preserve PHP blocks you might want to define:



```ruby

options = {

  :preserve_patterns => [/<\?php.*?\?>/im]

}

```



## CSS and JavaScript Compression



By default CSS/JS compression is disabled.

In order to minify in page javascript and css, you need to supply a compressor in the options hash.

A compressor can be `:yui` or `:closure` or any object that responds to `:compress`. E.g.: `compressed = compressor.compress(source)`



```ruby

class MyCompressor



  def compress(source)

    return 'minified'

  end



end



options = {

  :compress_css => true,

  :css_compressor => MyCompressor.new,

  :compress_javascript => true,

  :javascript_compressor => MyCompressor.new

}

```



Please note that in order to use yui or closure compilers you need to manually add them to the Gemfile



```ruby

gem 'yui-compressor'



...



options = {

  :compress_javascript => true,

  :javascript_compressor => :yui,

  :compress_css => true,

  :css_compressor => :yui

}

```



```ruby

gem 'closure-compiler'



...



options = {

  :compress_javascript => true,

  :javascript_compressor => :closure

}

```



## Statistics



As of now the statistic framework hasn't been ported. Refer to original [htmlcompressor documentation](http://code.google.com/p/htmlcompressor/) for statistics on minified pages.



## License



Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at



  http://www.apache.org/licenses/LICENSE-2.0



Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.



## Contributing



1. Fork it

2. Create your feature branch (`git checkout -b my-new-feature`)

3. Commit your changes (`git commit -am 'Added some feature'`)

4. Push to the branch (`git push origin my-new-feature`)

5. Create new Pull Request