Class: AutoprefixerRails::Processor

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

Overview

Ruby to JS wrapper for Autoprefixer processor instance

Constant Summary collapse

SUPPORTED_RUNTIMES = 
[ExecJS::Runtimes::Node, ExecJS::Runtimes::MiniRacer]

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 14

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 52

def info
  runtime.call("autoprefixer.info", params_with_browsers)
end

#parse_config(config) ⇒ Object

Parse Browserslist config



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# File 'lib/autoprefixer-rails/processor.rb', line 57

def parse_config(config)
  sections = { "defaults" => [] }
  current  = "defaults"
  config.gsub(/#[^\n]*/, "")
        .split(/\n/)
        .map(&:strip)
        .reject(&:empty?)
        .each do |line|
    if IS_SECTION =~ line
      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 24

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

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

  begin
    result = runtime.call("autoprefixer.process", css, process_opts, plugin_opts)
  rescue ExecJS::ProgramError => e
    contry_error = "BrowserslistError: " \
      "Country statistics are 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