Class: BrowserslistUseragent::Resolver

Inherits:
Object
  • Object
show all
Defined in:
lib/browserslist_useragent/resolver.rb

Overview

Resolves uaser agent string to version hash

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(user_agent_string) ⇒ Resolver

Returns a new instance of Resolver.



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# File 'lib/browserslist_useragent/resolver.rb', line 10

def initialize(user_agent_string)
  @user_agent_string = user_agent_string
end

Instance Attribute Details

#user_agent_string ⇒ Object (readonly)

Returns the value of attribute user_agent_string.



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# File 'lib/browserslist_useragent/resolver.rb', line 8

def user_agent_string
  @user_agent_string
end

Class Method Details

.user_agent_parser ⇒ Object 



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# File 'lib/browserslist_useragent/resolver.rb', line 52

def self.user_agent_parser
  @user_agent_parser ||= UserAgentParser::Parser.new
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/browserslist_useragent/resolver.rb', line 14

def call
  agent = self.class.user_agent_parser.parse(user_agent_string)

  family = agent.family
  version = VersionNormalizer.new(agent.version.to_s).call

  # Case A: For Safari, Chrome and others browsers on iOS
  # that report as Safari after stripping tags
  family = 'iOS' if agent.family.include?('Safari') && agent.os.family == 'iOS'

  # Case B: The browser on iOS didn't report as safari,
  # so we use the iOS version as a proxy to the browser
  # version. This is based on the assumption that the
  # underlying Safari Engine used will be *atleast* equal
  # to the iOS version it's running on.
  if agent.os.family == 'iOS'
    return {
      family: 'iOS',
      version: VersionNormalizer.new(agent.os.version.to_s).call
    }
  end

  # Case C: The caniuse database does not contain
  # historical browser versions for so called `minor`
  # browsers like Chrome for Android, Firefox for Android etc
  # In this case, we proxy to the desktop version
  # @see https://github.com/Fyrd/caniuse/issues/3518
  family = 'Chrome' if agent.family.include?('Chrome Mobile')
  family = 'Chrome' if agent.family == 'HeadlessChrome'
  family = 'Firefox' if agent.family == 'Firefox Mobile'
  family = 'Explorer' if agent.family == 'IE'
  family = 'ExplorerMobile' if agent.family == 'IE Mobile'
  family = 'QQAndroid' if agent.family == 'QQ Browser Mobile'
  family = 'UCAndroid' if agent.family == 'UC Browser'

  { family: family, version: version }
end