Module: Sprockets::Loader

# File 'lib/sprockets/loader.rb', line 67

def compress_key_from_hash(hash, key)
  return unless hash.key?(key)
  value = hash[key].dup
  return if !value

  if block_given?
    value.map! do |x|
      if yield x
       compress_from_root(x)
      else
       x
      end
    end
  else
    value.map! { |x| compress_from_root(x) }
  end
  hash[key] = value
end

# File 'lib/sprockets/loader.rb', line 87

def expand_key_from_hash(hash, key)
  return unless hash.key?(key)
  value = hash[key].dup
  return if !value
  if block_given?
    value.map! do |x|
      if yield x
        expand_from_root(x)
      else
        x
      end
    end
  else
    value.map! { |x| expand_from_root(x) }
  end
  hash[key] = value
end

# File 'lib/sprockets/loader.rb', line 325

def fetch_asset_from_dependency_cache(unloaded, limit = 3)
  key = unloaded.dependency_history_key

  history = cache.get(key) || []
  history.each_with_index do |deps, index|
    expanded_deps = deps.map do |path|
      path.start_with?("file-digest://") ? expand_from_root(path) : path
    end
    if asset = yield(expanded_deps)
      cache.set(key, history.rotate!(index)) if index > 0
      return asset
    end
  end

  asset = yield
  deps  = asset[:metadata][:dependencies].dup.map! do |uri|
    uri.start_with?("file-digest://") ? compress_from_root(uri) : uri
  end
  cache.set(key, history.unshift(deps).take(limit))
  asset
end

# File 'lib/sprockets/loader.rb', line 31

def load(uri)
  unloaded = UnloadedAsset.new(uri, self)
  if unloaded.params.key?(:id)
    unless asset = asset_from_cache(unloaded.asset_key)
      id = unloaded.params.delete(:id)
      uri_without_id = build_asset_uri(unloaded.filename, unloaded.params)
      asset = load_from_unloaded(UnloadedAsset.new(uri_without_id, self))
      if asset[:id] != id
        @logger.warn "Sprockets load error: Tried to find #{uri}, but latest was id #{asset[:id]}"
      end
    end
  else
    asset = fetch_asset_from_dependency_cache(unloaded) do |paths|
      # When asset is previously generated, its "dependencies" are stored in the cache.
      # The presence of `paths` indicates dependencies were stored.
      # We can check to see if the dependencies have not changed by "resolving" them and
      # generating a digest key from the resolved entries. If this digest key has not
      # changed, the asset will be pulled from cache.
      #
      # If this `paths` is present but the cache returns nothing then `fetch_asset_from_dependency_cache`
      # will confusingly be called again with `paths` set to nil where the asset will be
      # loaded from disk.
      if paths
        digest = DigestUtils.digest(resolve_dependencies(paths))
        if uri_from_cache = cache.get(unloaded.digest_key(digest), true)
          asset_from_cache(UnloadedAsset.new(uri_from_cache, self).asset_key)
        end
      else
        load_from_unloaded(unloaded)
      end
    end
  end
  Asset.new(asset)
end

# File 'lib/sprockets/loader.rb', line 139

def load_from_unloaded(unloaded)
  unless file?(unloaded.filename)
    raise FileNotFound, "could not find file: #{unloaded.filename}"
  end

  path_to_split =
    if index_alias = unloaded.params[:index_alias]
      expand_from_root index_alias
    else
      unloaded.filename
    end

  load_path, logical_path = paths_split(config[:paths], path_to_split)

  unless load_path
    target = path_to_split
    target += " (index alias of #{unloaded.filename})" if unloaded.params[:index_alias]
    raise FileOutsidePaths, "#{target} is no longer under a load path: #{self.paths.join(', ')}"
  end

  extname, file_type = match_path_extname(logical_path, mime_exts)
  logical_path = logical_path.chomp(extname)
  name = logical_path

  if pipeline = unloaded.params[:pipeline]
    logical_path += ".#{pipeline}"
  end

  if type = unloaded.params[:type]
    extensions = config[:mime_types][type][:extensions]
    extension = extensions.include?(extname) ? extname : extensions.first
    logical_path += extension
  end

  if type != file_type && !config[:transformers][file_type][type]
    raise ConversionError, "could not convert #{file_type.inspect} to #{type.inspect}"
  end

  processors = processors_for(type, file_type, pipeline)

  processors_dep_uri = build_processors_uri(type, file_type, pipeline)
  dependencies = config[:dependencies] + [processors_dep_uri]

  # Read into memory and process if theres a processor pipeline
  if processors.any?
    result = call_processors(processors, {
      environment: self,
      cache: self.cache,
      uri: unloaded.uri,
      filename: unloaded.filename,
      load_path: load_path,
      name: name,
      content_type: type,
      metadata: {
        dependencies: dependencies
      }
    })
    validate_processor_result!(result)
    source = result.delete(:data)
    metadata = result
    metadata[:charset] = source.encoding.name.downcase unless metadata.key?(:charset)
    metadata[:digest]  = digest(source)
    metadata[:length]  = source.bytesize
    metadata[:environment_version] = version
  else
    dependencies << build_file_digest_uri(unloaded.filename)
    metadata = {
      digest: file_digest(unloaded.filename),
      length: self.stat(unloaded.filename).size,
      dependencies: dependencies,
      environment_version: version,
    }
  end

  asset = {
    uri: unloaded.uri,
    load_path: load_path,
    filename: unloaded.filename,
    name: name,
    logical_path: logical_path,
    content_type: type,
    source: source,
    metadata: metadata,
    dependencies_digest: DigestUtils.digest(resolve_dependencies(metadata[:dependencies]))
  }

  asset[:id]  = hexdigest(asset)
  asset[:uri] = build_asset_uri(unloaded.filename, unloaded.params.merge(id: asset[:id]))

  store_asset(asset, unloaded)
  asset
end

# File 'lib/sprockets/loader.rb', line 289

def resolve_dependencies(uris)
  uris.map { |uri| resolve_dependency(uri) }
end

# File 'lib/sprockets/loader.rb', line 239

def store_asset(asset, unloaded)
  # Save the asset in the cache under the new URI
  cached_asset             = asset.dup
  cached_asset[:uri]       = compress_from_root(asset[:uri])
  cached_asset[:filename]  = compress_from_root(asset[:filename])
  cached_asset[:load_path] = compress_from_root(asset[:load_path])

  if cached_asset[:metadata]
    # Deep dup to avoid modifying `asset`
    cached_asset[:metadata] = cached_asset[:metadata].dup
    compress_key_from_hash(cached_asset[:metadata], :included)
    compress_key_from_hash(cached_asset[:metadata], :links)
    compress_key_from_hash(cached_asset[:metadata], :stubbed)
    compress_key_from_hash(cached_asset[:metadata], :required)
    compress_key_from_hash(cached_asset[:metadata], :to_load)
    compress_key_from_hash(cached_asset[:metadata], :to_link)
    compress_key_from_hash(cached_asset[:metadata], :dependencies) { |uri| uri.start_with?("file-digest://") }

    cached_asset[:metadata].each do |key, value|
      next unless key.match?(/_dependencies\z/) # rubocop:disable Performance/EndWith
      compress_key_from_hash(cached_asset[:metadata], key)
    end
  end

  # Unloaded asset and stored_asset now have a different URI
  stored_asset = UnloadedAsset.new(asset[:uri], self)
  cache.set(stored_asset.asset_key, cached_asset, true)

  # Save the new relative path for the digest key of the unloaded asset
  cache.set(unloaded.digest_key(asset[:dependencies_digest]), stored_asset.compressed_path, true)
end