Class: AutoprefixerRails::Processor

Inherits:
Object
  • Object
show all
Defined in:
lib/autoprefixer-rails/processor.rb

Overview

Ruby to JS wrapper for Autoprefixer processor instance

Instance Method Summary collapse

Constructor Details

#initialize(params = { }) ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/autoprefixer-rails/processor.rb', line 11

def initialize(params = { })
  @params = params || { }
end

Instance Method Details

#info ⇒ Object

Return, which browsers and prefixes will be used



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# File 'lib/autoprefixer-rails/processor.rb', line 54

def info
  runtime.eval("autoprefixer(#{ js_params }).info()")
end

#parse_config(config) ⇒ Object

Parse Browserslist config



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# File 'lib/autoprefixer-rails/processor.rb', line 59

def parse_config(config)
  sections = { 'defaults' => [] }
  current  = 'defaults'
  config.gsub(/#[^\n]*/, '')
        .split(/\n/)
        .map(&:strip)
        .reject(&:empty?)
        .each do |line|
          if line =~ IS_SECTION
            current = line.match(IS_SECTION)[1].strip
            sections[current] ||= []
          else
            sections[current] << line
          end
        end
  sections
end

#process(css, opts = { }) ⇒ Object

Process ‘css` and return result.

Options can be:

  • ‘from` with input CSS file name. Will be used in error messages.

  • ‘to` with output CSS file name.

  • ‘map` with true to generate new source map or with previous map.



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# File 'lib/autoprefixer-rails/processor.rb', line 21

def process(css, opts = { })
  opts = convert_options(opts)

  apply_wrapper =
    "(function(opts, pluginOpts) {" +
    "return eval(process.apply(this, opts, pluginOpts));" +
    "})"

  pluginOpts = params_with_browsers(opts[:from]).merge(opts)
  processOpts = {
    from: pluginOpts.delete(:from),
    to:   pluginOpts.delete(:to),
    map:  pluginOpts.delete(:map)
  }

  begin
    result = runtime.call(apply_wrapper, [css, processOpts, pluginOpts])
  rescue ExecJS::ProgramError => e
    contry_error = 'BrowserslistError: ' +
      'Country statistics is not supported ' +
      'in client-side build of Browserslist'
    if e.message == contry_error
      raise 'Country statistics is not supported in AutoprefixerRails. ' +
            'Use Autoprefixer with webpack or other Node.js builder.'
    else
      raise e
    end
  end

  Result.new(result['css'], result['map'], result['warnings'])
end