module Sprockets::Dependencies

def add_dependency(uri)

Returns nothing.

uri - String dependency URI

Public: Add environmental dependency inheirted by all assets. 
def add_dependency(uri)
  self.config = hash_reassoc(config, :dependencies) do |set|
    set + Set.new([uri])
  end
end

def dependencies

Returns Set of String URIs.

Public: Default set of dependency URIs for assets. 
def dependencies
  config[:dependencies]
end

def dependency_resolvers

Returns Hash.

value - Proc.call(Environment, String)
key - String scheme

Public: Mapping dependency schemes to resolver functions. 
def dependency_resolvers
  config[:dependency_resolvers]
end

def register_dependency_resolver(scheme, &block)

Returns nothing.

uri - String dependency URI
environment - Environment
block -
scheme - String scheme

Public: Register new dependency URI resolver. 
def register_dependency_resolver(scheme, &block)
  self.config = hash_reassoc(config, :dependency_resolvers) do |hash|
    hash.merge(scheme => block)
  end
end

def resolve_dependency(str)

Returns resolved Object.

Internal: Resolve dependency URIs. 
def resolve_dependency(str)
  # Optimize for the most common scheme to
  # save 22k allocations on an average Spree app.
  scheme = if str.start_with?('file-digest:'.freeze)
    'file-digest'.freeze
  else
    str[/([^:]+)/, 1]
  end
  if resolver = config[:dependency_resolvers][scheme]
    resolver.call(self, str)
  else
    nil
  end
end