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Diffstat (limited to 'actionpack/lib/action_view/template/resolver.rb')
| -rw-r--r-- | actionpack/lib/action_view/template/resolver.rb | 327 |
1 files changed, 0 insertions, 327 deletions
diff --git a/actionpack/lib/action_view/template/resolver.rb b/actionpack/lib/action_view/template/resolver.rb deleted file mode 100644 index fc77c1485d..0000000000 --- a/actionpack/lib/action_view/template/resolver.rb +++ /dev/null @@ -1,327 +0,0 @@ -require "pathname" -require "active_support/core_ext/class" -require "active_support/core_ext/class/attribute_accessors" -require "action_view/template" -require "thread" -require "mutex_m" - -module ActionView - # = Action View Resolver - class Resolver - # Keeps all information about view path and builds virtual path. - class Path - attr_reader :name, :prefix, :partial, :virtual - alias_method :partial?, :partial - - def self.build(name, prefix, partial) - virtual = "" - virtual << "#{prefix}/" unless prefix.empty? - virtual << (partial ? "_#{name}" : name) - new name, prefix, partial, virtual - end - - def initialize(name, prefix, partial, virtual) - @name = name - @prefix = prefix - @partial = partial - @virtual = virtual - end - - def to_str - @virtual - end - alias :to_s :to_str - end - - # Threadsafe template cache - class Cache #:nodoc: - class CacheEntry - include Mutex_m - - attr_accessor :templates - end - - def initialize - @data = Hash.new { |h1,k1| h1[k1] = Hash.new { |h2,k2| - h2[k2] = Hash.new { |h3,k3| h3[k3] = Hash.new { |h4,k4| h4[k4] = {} } } } } - @mutex = Mutex.new - end - - # Cache the templates returned by the block - def cache(key, name, prefix, partial, locals) - cache_entry = nil - - # first obtain a lock on the main data structure to create the cache entry - @mutex.synchronize do - cache_entry = @data[key][name][prefix][partial][locals] ||= CacheEntry.new - end - - # then to avoid a long lasting global lock, obtain a more granular lock - # on the CacheEntry itself - cache_entry.synchronize do - if Resolver.caching? - cache_entry.templates ||= yield - else - fresh_templates = yield - - if templates_have_changed?(cache_entry.templates, fresh_templates) - cache_entry.templates = fresh_templates - else - cache_entry.templates ||= [] - end - end - end - end - - def clear - @mutex.synchronize do - @data.clear - end - end - - private - - def templates_have_changed?(cached_templates, fresh_templates) - # if either the old or new template list is empty, we don't need to (and can't) - # compare modification times, and instead just check whether the lists are different - if cached_templates.blank? || fresh_templates.blank? - return fresh_templates.blank? != cached_templates.blank? - end - - cached_templates_max_updated_at = cached_templates.map(&:updated_at).max - - # if a template has changed, it will be now be newer than all the cached templates - fresh_templates.any? { |t| t.updated_at > cached_templates_max_updated_at } - end - end - - cattr_accessor :caching - self.caching = true - - class << self - alias :caching? :caching - end - - def initialize - @cache = Cache.new - end - - def clear_cache - @cache.clear - end - - # Normalizes the arguments and passes it on to find_template. - def find_all(name, prefix=nil, partial=false, details={}, key=nil, locals=[]) - cached(key, [name, prefix, partial], details, locals) do - find_templates(name, prefix, partial, details) - end - end - - private - - delegate :caching?, :to => "self.class" - - # This is what child classes implement. No defaults are needed - # because Resolver guarantees that the arguments are present and - # normalized. - def find_templates(name, prefix, partial, details) - raise NotImplementedError, "Subclasses must implement a find_templates(name, prefix, partial, details) method" - end - - # Helpers that builds a path. Useful for building virtual paths. - def build_path(name, prefix, partial) - Path.build(name, prefix, partial) - end - - # Handles templates caching. If a key is given and caching is on - # always check the cache before hitting the resolver. Otherwise, - # it always hits the resolver but if the key is present, check if the - # resolver is fresher before returning it. - def cached(key, path_info, details, locals) #:nodoc: - name, prefix, partial = path_info - locals = locals.map { |x| x.to_s }.sort! - - if key - @cache.cache(key, name, prefix, partial, locals) do - decorate(yield, path_info, details, locals) - end - else - decorate(yield, path_info, details, locals) - end - end - - # Ensures all the resolver information is set in the template. - def decorate(templates, path_info, details, locals) #:nodoc: - cached = nil - templates.each do |t| - t.locals = locals - t.formats = details[:formats] || [:html] if t.formats.empty? - t.virtual_path ||= (cached ||= build_path(*path_info)) - end - end - end - - # An abstract class that implements a Resolver with path semantics. - class PathResolver < Resolver #:nodoc: - EXTENSIONS = [:locale, :formats, :handlers] - DEFAULT_PATTERN = ":prefix/:action{.:locale,}{.:formats,}{.:handlers,}" - - def initialize(pattern=nil) - @pattern = pattern || DEFAULT_PATTERN - super() - end - - private - - def find_templates(name, prefix, partial, details) - path = Path.build(name, prefix, partial) - query(path, details, details[:formats]) - end - - def query(path, details, formats) - query = build_query(path, details) - - # deals with case-insensitive file systems. - sanitizer = Hash.new { |h,dir| h[dir] = Dir["#{dir}/*"] } - - template_paths = Dir[query].reject { |filename| - File.directory?(filename) || - !sanitizer[File.dirname(filename)].include?(filename) - } - - template_paths.map { |template| - handler, format = extract_handler_and_format(template, formats) - contents = File.binread template - - Template.new(contents, File.expand_path(template), handler, - :virtual_path => path.virtual, - :format => format, - :updated_at => mtime(template)) - } - end - - # Helper for building query glob string based on resolver's pattern. - def build_query(path, details) - query = @pattern.dup - - prefix = path.prefix.empty? ? "" : "#{escape_entry(path.prefix)}\\1" - query.gsub!(/\:prefix(\/)?/, prefix) - - partial = escape_entry(path.partial? ? "_#{path.name}" : path.name) - query.gsub!(/\:action/, partial) - - details.each do |ext, variants| - query.gsub!(/\:#{ext}/, "{#{variants.compact.uniq.join(',')}}") - end - - File.expand_path(query, @path) - end - - def escape_entry(entry) - entry.gsub(/[*?{}\[\]]/, '\\\\\\&') - end - - # Returns the file mtime from the filesystem. - def mtime(p) - File.mtime(p) - end - - # Extract handler and formats from path. If a format cannot be a found neither - # from the path, or the handler, we should return the array of formats given - # to the resolver. - def extract_handler_and_format(path, default_formats) - pieces = File.basename(path).split(".") - pieces.shift - - extension = pieces.pop - unless extension - message = "The file #{path} did not specify a template handler. The default is currently ERB, " \ - "but will change to RAW in the future." - ActiveSupport::Deprecation.warn message - end - - handler = Template.handler_for_extension(extension) - format = pieces.last && Template::Types[pieces.last] - [handler, format] - end - end - - # A resolver that loads files from the filesystem. It allows setting your own - # resolving pattern. Such pattern can be a glob string supported by some variables. - # - # ==== Examples - # - # Default pattern, loads views the same way as previous versions of rails, eg. when you're - # looking for `users/new` it will produce query glob: `users/new{.{en},}{.{html,js},}{.{erb,haml},}` - # - # FileSystemResolver.new("/path/to/views", ":prefix/:action{.:locale,}{.:formats,}{.:handlers,}") - # - # This one allows you to keep files with different formats in seperated subdirectories, - # eg. `users/new.html` will be loaded from `users/html/new.erb` or `users/new.html.erb`, - # `users/new.js` from `users/js/new.erb` or `users/new.js.erb`, etc. - # - # FileSystemResolver.new("/path/to/views", ":prefix/{:formats/,}:action{.:locale,}{.:formats,}{.:handlers,}") - # - # If you don't specify a pattern then the default will be used. - # - # In order to use any of the customized resolvers above in a Rails application, you just need - # to configure ActionController::Base.view_paths in an initializer, for example: - # - # ActionController::Base.view_paths = FileSystemResolver.new( - # Rails.root.join("app/views"), - # ":prefix{/:locale}/:action{.:formats,}{.:handlers,}" - # ) - # - # ==== Pattern format and variables - # - # Pattern has to be a valid glob string, and it allows you to use the - # following variables: - # - # * <tt>:prefix</tt> - usually the controller path - # * <tt>:action</tt> - name of the action - # * <tt>:locale</tt> - possible locale versions - # * <tt>:formats</tt> - possible request formats (for example html, json, xml...) - # * <tt>:handlers</tt> - possible handlers (for example erb, haml, builder...) - # - class FileSystemResolver < PathResolver - def initialize(path, pattern=nil) - raise ArgumentError, "path already is a Resolver class" if path.is_a?(Resolver) - super(pattern) - @path = File.expand_path(path) - end - - def to_s - @path.to_s - end - alias :to_path :to_s - - def eql?(resolver) - self.class.equal?(resolver.class) && to_path == resolver.to_path - end - alias :== :eql? - end - - # An Optimized resolver for Rails' most common case. - class OptimizedFileSystemResolver < FileSystemResolver #:nodoc: - def build_query(path, details) - exts = EXTENSIONS.map { |ext| details[ext] } - query = escape_entry(File.join(@path, path)) - - query + exts.map { |ext| - "{#{ext.compact.uniq.map { |e| ".#{e}," }.join}}" - }.join - end - end - - # The same as FileSystemResolver but does not allow templates to store - # a virtual path since it is invalid for such resolvers. - class FallbackFileSystemResolver < FileSystemResolver #:nodoc: - def self.instances - [new(""), new("/")] - end - - def decorate(*) - super.each { |t| t.virtual_path = nil } - end - end -end |