JezK

Edit File: resolve.rb

require 'set'
require 'sprockets/http_utils'
require 'sprockets/path_dependency_utils'
require 'sprockets/uri_utils'

module Sprockets
  module Resolve
    include HTTPUtils, PathDependencyUtils, URIUtils

# Public: Find Asset URI for given a logical path by searching the
    # environment's load paths.
    #
    #     resolve("application.js")
    #     # => "file:///path/to/app/javascripts/application.js?type=application/javascript"
    #
    # An accept content type can be given if the logical path doesn't have a
    # format extension.
    #
    #     resolve("application", accept: "application/javascript")
    #     # => "file:///path/to/app/javascripts/application.coffee?type=application/javascript"
    #
    # The String Asset URI is returned or nil if no results are found.
    def resolve(path, options = {})
      path = path.to_s
      paths = options[:load_paths] || config[:paths]
      accept = options[:accept]

if valid_asset_uri?(path)
        uri, deps = resolve_asset_uri(path)
      elsif absolute_path?(path)
        filename, type, deps = resolve_absolute_path(paths, path, accept)
      elsif relative_path?(path)
        filename, type, pipeline, deps = resolve_relative_path(paths, path, options[:base_path], accept)
      else
        filename, type, pipeline, deps = resolve_logical_path(paths, path, accept)
      end

if filename
        params = {}
        params[:type] = type if type
        params[:pipeline] = pipeline if pipeline
        params[:pipeline] = options[:pipeline] if options[:pipeline]
        uri = build_asset_uri(filename, params)
      end

return uri, deps
    end

# Public: Same as resolve() but raises a FileNotFound exception instead of
    # nil if no assets are found.
    def resolve!(path, options = {})
      uri, deps = resolve(path, options.merge(compat: false))

unless uri
        message = "couldn't find file '#{path}'"

if relative_path?(path) && options[:base_path]
          load_path, _ = paths_split(config[:paths], options[:base_path])
          message << " under '#{load_path}'"
        end

message << " with type '#{options[:accept]}'" if options[:accept]
        message << "\nChecked in these paths: \n  #{ config[:paths].join("\n  ") }"

raise FileNotFound, message
      end

return uri, deps
    end

protected
      def resolve_asset_uri(uri)
        filename, _ = parse_asset_uri(uri)
        return uri, Set.new([build_file_digest_uri(filename)])
      end

def resolve_absolute_path(paths, filename, accept)
        deps = Set.new
        filename = File.expand_path(filename)

# Ensure path is under load paths
        return nil, nil, deps unless paths_split(paths, filename)

_, mime_type, _, _ = parse_path_extnames(filename)
        type = resolve_transform_type(mime_type, accept)
        return nil, nil, deps if accept && !type

return nil, nil, deps unless file?(filename)

deps << build_file_digest_uri(filename)
        return filename, type, deps
      end

def resolve_relative_path(paths, path, dirname, accept)
        filename = File.expand_path(path, dirname)
        load_path, _ = paths_split(paths, dirname)
        if load_path && logical_path = split_subpath(load_path, filename)
          resolve_logical_path([load_path], logical_path, accept)
        else
          return nil, nil, Set.new
        end
      end

def resolve_logical_path(paths, logical_path, accept)
        logical_name, mime_type, _, pipeline = parse_path_extnames(logical_path)
        parsed_accept = parse_accept_options(mime_type, accept)
        transformed_accepts = expand_transform_accepts(parsed_accept)
        filename, mime_type, deps = resolve_under_paths(paths, logical_name, transformed_accepts)

if filename
          deps << build_file_digest_uri(filename)
          type = resolve_transform_type(mime_type, parsed_accept)
          return filename, type, pipeline, deps
        else
          return nil, nil, nil, deps
        end
      end

def resolve_under_paths(paths, logical_name, accepts)
        all_deps = Set.new
        return nil, nil, all_deps if accepts.empty?

logical_basename = File.basename(logical_name)
        paths.each do |load_path|
          candidates, deps = path_matches(load_path, logical_name, logical_basename)
          all_deps.merge(deps)
          candidate = find_best_q_match(accepts, candidates) do |c, matcher|
            match_mime_type?(c[1] || "application/octet-stream", matcher)
          end
          return candidate + [all_deps] if candidate
        end

return nil, nil, all_deps
      end

def parse_accept_options(mime_type, types)
        accepts = []
        accepts += parse_q_values(types) if types

if mime_type
          if accepts.empty? || accepts.any? { |accept, _| match_mime_type?(mime_type, accept) }
            accepts = [[mime_type, 1.0]]
          else
            return []
          end
        end

if accepts.empty?
          accepts << ['*/*', 1.0]
        end

accepts
      end

def path_matches(load_path, logical_name, logical_basename)
        dirname    = File.dirname(File.join(load_path, logical_name))
        candidates = dirname_matches(dirname, logical_basename)
        deps       = file_digest_dependency_set(dirname)

result = resolve_alternates(load_path, logical_name)
        result[0].each do |fn|
          candidates << [fn, parse_path_extnames(fn)[1]]
        end
        deps.merge(result[1])

dirname = File.join(load_path, logical_name)
        if directory? dirname
          result = dirname_matches(dirname, "index")
          candidates.concat(result)
        end

deps.merge(file_digest_dependency_set(dirname))

return candidates.select { |fn, _| file?(fn) }, deps
      end

def dirname_matches(dirname, basename)
        candidates = []
        entries = self.entries(dirname)
        entries.each do |entry|
          next unless File.basename(entry).start_with?(basename)
          name, type, _, _ = parse_path_extnames(entry)
          if basename == name
            candidates << [File.join(dirname, entry), type]
          end
        end
        candidates
      end

def resolve_alternates(load_path, logical_name)
        return [], Set.new
      end

# Internal: Returns the name, mime type and `Array` of engine extensions.
      #
      #     "foo.js.coffee.erb"
      #     # => ["foo", "application/javascript", [".coffee", ".erb"]]
      #
      def parse_path_extnames(path)
        engines = []
        extname, value = match_path_extname(path, extname_map)

if extname
          path = path.chomp(extname)
          type, engines, pipeline = value.values_at(:type, :engines, :pipeline)
        end

return path, type, engines, pipeline
      end
  end
end

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