Class: Puppeteer::CSSCoverage

Inherits:
Object
  • Object
show all
Includes:
Puppeteer::Coverage::UtilFunctions
Defined in:
lib/puppeteer/css_coverage.rb

Defined Under Namespace

Classes: Item

Instance Method Summary collapse

Constructor Details

#initialize(client) ⇒ CSSCoverage

Returns a new instance of CSSCoverage.

Parameters:



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# File 'lib/puppeteer/css_coverage.rb', line 16

def initialize(client)
  @client = client
  @enabled = false
  @stylesheet_urls = {}
  @stylesheet_sources = {}
end

Instance Method Details

#start(reset_on_navigation: nil) ⇒ Object 



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# File 'lib/puppeteer/css_coverage.rb', line 23

def start(reset_on_navigation: nil)
  raise 'CSSCoverage is already enabled' if @enabled

  @reset_on_navigation =
    if [true, false].include?(reset_on_navigation)
      reset_on_navigation
    else
      true
    end

  @enabled = true
  @stylesheet_urls.clear
  @stylesheet_sources.clear
  @event_listeners = []
  @event_listeners << @client.add_event_listener('CSS.styleSheetAdded') do |event|
    future { on_stylesheet(event) }
  end
  @event_listeners << @client.add_event_listener('Runtime.executionContextsCleared') do
    on_execution_contexts_cleared
  end
  await_all(
    @client.async_send_message('DOM.enable'),
    @client.async_send_message('CSS.enable'),
    @client.async_send_message('CSS.startRuleUsageTracking'),
  )
end

#stop ⇒ Object 



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# File 'lib/puppeteer/css_coverage.rb', line 74

def stop
  raise 'CSSCoverage is not enabled' unless @enabled
  @enabled = false

  rule_tracking_response = @client.send_message('CSS.stopRuleUsageTracking')
  await_all(
    @client.async_send_message('CSS.disable'),
    @client.async_send_message('DOM.disable'),
  )
  @client.remove_event_listener(*@event_listeners)

  # aggregate by styleSheetId
  stylesheet_id_to_coverage = {}
  rule_tracking_response['ruleUsage'].each do |entry|
    ranges = stylesheet_id_to_coverage[entry['styleSheetId']]
    unless ranges
      ranges = []
      stylesheet_id_to_coverage[entry['styleSheetId']] = ranges
    end

    ranges << {
      'startOffset' => entry['startOffset'],
      'endOffset' => entry['endOffset'],
      'count' => entry['used'] ? 1 : 0,
    }
  end

  coverage = []
  @stylesheet_urls.each do |stylesheet_id, url|
    text = @stylesheet_sources[stylesheet_id]
    ranges = convert_to_disjoint_ranges(stylesheet_id_to_coverage[stylesheet_id] || [])
    coverage << Item.new(url: url, ranges: ranges, text: text)
  end

  coverage
end