Class: ActionView::Digestor

Relationships & Source Files
Namespace Children
Modules: `PerExecutionDigestCacheExpiry`
Classes: `Injected`, `Missing`, `Node`, `NullLogger`, `Partial`
Inherits:	Object
Defined in:	actionview/lib/action_view/digestor.rb

Class Method Summary

.digest(name:, finder:, dependencies: [])

Supported options:
.logger
.tree(name, finder, partial = false, seen = {})

Create a dependency tree for template named name.

Class Method Details

.digest(name:, finder:, dependencies: [])

Supported options:

name - Template name
finder - An instance of LookupContext
dependencies - An array of dependent views

[ GitHub ]

# File 'actionview/lib/action_view/digestor.rb', line 23


def digest(name:, finder:, dependencies: [])
  dependencies ||= []
  cache_key = [ name, finder.rendered_format, dependencies ].flatten.compact.join(".")

  # this is a correctly done double-checked locking idiom
  # (Concurrent::Map's lookups have volatile semantics)
  finder.digest_cache[cache_key] || @@digest_mutex.synchronize do
    finder.digest_cache.fetch(cache_key) do # re-check under lock
      partial = name.include?("/_")
      root = tree(name, finder, partial)
      dependencies.each do |injected_dep|
        root.children << Injected.new(injected_dep, nil, nil)
      end
      finder.digest_cache[cache_key] = root.digest(finder)
    end
  end
end

.logger

[ GitHub ]

# File 'actionview/lib/action_view/digestor.rb', line 41


def logger
  ActionView::Base.logger || NullLogger
end

.tree(name, finder, partial = false, seen = {})

Create a dependency tree for template named name.

[ GitHub ]

# File 'actionview/lib/action_view/digestor.rb', line 46


def tree(name, finder, partial = false, seen = {})
  logical_name = name.gsub(%r|/_|, "/")

  if template = find_template(finder, logical_name, [], partial, [])
    finder.rendered_format ||= template.formats.first

    if node = seen[template.identifier] # handle cycles in the tree
      node
    else
      node = seen[template.identifier] = Node.create(name, logical_name, template, partial)

      deps = DependencyTracker.find_dependencies(name, template, finder.view_paths)
      deps.uniq { |n| n.gsub(%r|/_|, "/") }.each do |dep_file|
        node.children << tree(dep_file, finder, true, seen)
      end
      node
    end
  else
    unless name.include?("#") # Dynamic template partial names can never be tracked
      logger.error "  Couldn't find template for digesting: #{name}"
    end

    seen[name] ||= Missing.new(name, logical_name, nil)
  end
end