Class: Condenser::PurgeCSSProcessor

Inherits:
NodeProcessor show all
Defined in:
lib/condenser/processors/purgecss_processor.rb

Instance Attribute Summary collapse

Attributes inherited from NodeProcessor

#npm_path

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from NodeProcessor

#binary, #exec_runtime, #exec_runtime_error, #exec_syntax_error, #name, #npm_install, #npm_module_path, setup

Constructor Details

#initialize(dir = nil, options = {}) ⇒ PurgeCSSProcessor

Returns a new instance of PurgeCSSProcessor.



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# File 'lib/condenser/processors/purgecss_processor.rb', line 26

def initialize(dir = nil, options = {})
  super(dir)
  @options = options
  npm_install('purgecss')
end

Instance Attribute Details

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/condenser/processors/purgecss_processor.rb', line 5

def options
  @options
end

Class Method Details

.call(environment, input) ⇒ Object

Public: initialize with custom options.

dir - String (path to node_modules directory) options - Hash

content - Array - html files to process
    ex. [File.expand_path('./docs-src/**/*.erb'), File.expand_path('./docs-src/assets/javascripts/**/*.js')]

Options are passed to PurgeCSS checkout [PurgeCSS Configurations](purgecss.com/configuration.html)



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# File 'lib/condenser/processors/purgecss_processor.rb', line 17

def self.call(environment, input)
  @instances ||= {}
  @instances[environment] ||= new(environment.npm_path, {
    content: [File.join(environment.base, '**/*.html'), File.join(environment.base, '**/*.js')]
  })
  @instances[environment].call(environment, input)
end

Instance Method Details

#call(environment, input) ⇒ Object 



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# File 'lib/condenser/processors/purgecss_processor.rb', line 32

def call(environment, input)
  result = exec_runtime("    const { PurgeCSS } = require(\"\#{File.join(npm_module_path('purgecss'))}\")\n    const options = \#{@options.to_json}\n    options.css = [{\n      raw: \#{JSON.dump(input[:source])}\n    }]\n    if(options.safelist) {\n      options.safelist = options.safelist.map(s => {\n        if(s[0] == \"/\" && s[s.length - 1] == \"/\") {\n          return new RegExp(s.slice(1, -1))\n        }\n        return s\n      })\n    }\n    if(!options.defaultExtractor) {\n      options.defaultExtractor = content => content.match(/[\\\\w\\\\-\\\\/\\\\:]+(?<!:)/g) || []\n    }\n    const result = new PurgeCSS().purge(options)\n    try {\n      result.then(\n        r => console.log(JSON.stringify({\n          success: r[0]\n        })),\n        function(e) {console.log(JSON.stringify({'error': [e.name, e.message, e.stack]}))}\n      )\n    } catch(e) {\n      console.log(JSON.stringify({'error': [e.name, e.message, e.stack]}));\n    }\n  JS\n  if result['error']\n    if result['error'][0] == 'SyntaxError'\n      raise exec_syntax_error(result['error'][1], \"/assets/\#{input[:filename]}\")\n    else\n      raise exec_runtime_error(result['error'][\"0\"][\"name\"] + \": \" + result['error'][\"0\"][\"reason\"])\n    end\n  else\n    input[:source] = result[\"success\"][\"css\"]\n  end\nend\n")