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Edit File : driver.rb \| Size : 36.62 KB
# frozen_string_literal: true require 'abbrev' require 'optparse' begin require 'readline' rescue LoadError end begin require 'win32console' rescue LoadError end require 'rdoc' ## # For RubyGems backwards compatibility require 'rdoc/ri/formatter' ## # The RI driver implements the command-line ri tool. # # The driver supports: # * loading RI data from: # * Ruby's standard library # * RubyGems # * ~/.rdoc # * A user-supplied directory # * Paging output (uses RI_PAGER environment variable, PAGER environment # variable or the less, more and pager programs) # * Interactive mode with tab-completion # * Abbreviated names (ri Zl shows Zlib documentation) # * Colorized output # * Merging output from multiple RI data sources class RDoc::RI::Driver ## # Base Driver error class class Error < RDoc::RI::Error; end ## # Raised when a name isn't found in the ri data stores class NotFoundError < Error def initialize(klass, suggestions = nil) # :nodoc: @klass = klass @suggestions = suggestions end ## # Name that wasn't found def name @klass end def message # :nodoc: str = "Nothing known about #{@klass}" if @suggestions and !@suggestions.empty? str += "\nDid you mean? #{@suggestions.join("\n ")}" end str end end ## # Show all method documentation following a class or module attr_accessor :show_all ## # An RDoc::RI::Store for each entry in the RI path attr_accessor :stores ## # Controls the user of the pager vs $stdout attr_accessor :use_stdout ## # Default options for ri def self.default_options options = {} options[:interactive] = false options[:profile] = false options[:show_all] = false options[:use_stdout] = !$stdout.tty? options[:width] = 72 # By default all standard paths are used. options[:use_system] = true options[:use_site] = true options[:use_home] = true options[:use_gems] = true options[:extra_doc_dirs] = [] return options end ## # Dump +data_path+ using pp def self.dump data_path require 'pp' File.open data_path, 'rb' do \|io\| pp Marshal.load(io.read) end end ## # Parses +argv+ and returns a Hash of options def self.process_args argv options = default_options opts = OptionParser.new do \|opt\| opt.accept File do \|file,\| File.readable?(file) and not File.directory?(file) and file end opt.program_name = File.basename $0 opt.version = RDoc::VERSION opt.release = nil opt.summary_indent = ' ' * 4 opt.banner = <<-EOT Usage: #{opt.program_name} [options] [name ...] Where name can be: Class \| Module \| Module::Class Class::method \| Class#method \| Class.method \| method gem_name: \| gem_name:README \| gem_name:History All class names may be abbreviated to their minimum unambiguous form. If a name is ambiguous, all valid options will be listed. A '.' matches either class or instance methods, while #method matches only instance and ::method matches only class methods. README and other files may be displayed by prefixing them with the gem name they're contained in. If the gem name is followed by a ':' all files in the gem will be shown. The file name extension may be omitted where it is unambiguous. For example: #{opt.program_name} Fil #{opt.program_name} File #{opt.program_name} File.new #{opt.program_name} zip #{opt.program_name} rdoc:README Note that shell quoting or escaping may be required for method names containing punctuation: #{opt.program_name} 'Array.[]' #{opt.program_name} compact\\! To see the default directories #{opt.program_name} will search, run: #{opt.program_name} --list-doc-dirs Specifying the --system, --site, --home, --gems, or --doc-dir options will limit ri to searching only the specified directories. ri options may be set in the RI environment variable. The ri pager can be set with the RI_PAGER environment variable or the PAGER environment variable. EOT opt.separator nil opt.separator "Options:" opt.separator nil opt.on("--[no-]interactive", "-i", "In interactive mode you can repeatedly", "look up methods with autocomplete.") do \|interactive\| options[:interactive] = interactive end opt.separator nil opt.on("--[no-]all", "-a", "Show all documentation for a class or", "module.") do \|show_all\| options[:show_all] = show_all end opt.separator nil opt.on("--[no-]list", "-l", "List classes ri knows about.") do \|list\| options[:list] = list end opt.separator nil opt.on("--[no-]pager", "Send output to a pager,", "rather than directly to stdout.") do \|use_pager\| options[:use_stdout] = !use_pager end opt.separator nil opt.on("-T", "Synonym for --no-pager.") do options[:use_stdout] = true end opt.separator nil opt.on("--width=WIDTH", "-w", OptionParser::DecimalInteger, "Set the width of the output.") do \|width\| options[:width] = width end opt.separator nil opt.on("--server[=PORT]", Integer, "Run RDoc server on the given port.", "The default port is 8214.") do \|port\| options[:server] = port \|\| 8214 end opt.separator nil formatters = RDoc::Markup.constants.grep(/^To[A-Z][a-z]+$/).sort formatters = formatters.sort.map do \|formatter\| formatter.to_s.sub('To', '').downcase end formatters -= %w[html label test] # remove useless output formats opt.on("--format=NAME", "-f", "Use the selected formatter. The default", "formatter is bs for paged output and ansi", "otherwise. Valid formatters are:", "#{formatters.join(', ')}.", formatters) do \|value\| options[:formatter] = RDoc::Markup.const_get "To#{value.capitalize}" end opt.separator nil opt.on("--help", "-h", "Show help and exit.") do puts opts exit end opt.separator nil opt.on("--version", "-v", "Output version information and exit.") do puts "#{opts.program_name} #{opts.version}" exit end opt.separator nil opt.separator "Data source options:" opt.separator nil opt.on("--[no-]list-doc-dirs", "List the directories from which ri will", "source documentation on stdout and exit.") do \|list_doc_dirs\| options[:list_doc_dirs] = list_doc_dirs end opt.separator nil opt.on("--doc-dir=DIRNAME", "-d", Array, "List of directories from which to source", "documentation in addition to the standard", "directories. May be repeated.") do \|value\| value.each do \|dir\| unless File.directory? dir then raise OptionParser::InvalidArgument, "#{dir} is not a directory" end options[:extra_doc_dirs] << File.expand_path(dir) end end opt.separator nil opt.on("--no-standard-docs", "Do not include documentation from", "the Ruby standard library, site_lib,", "installed gems, or ~/.rdoc.", "Use with --doc-dir.") do options[:use_system] = false options[:use_site] = false options[:use_gems] = false options[:use_home] = false end opt.separator nil opt.on("--[no-]system", "Include documentation from Ruby's", "standard library. Defaults to true.") do \|value\| options[:use_system] = value end opt.separator nil opt.on("--[no-]site", "Include documentation from libraries", "installed in site_lib.", "Defaults to true.") do \|value\| options[:use_site] = value end opt.separator nil opt.on("--[no-]gems", "Include documentation from RubyGems.", "Defaults to true.") do \|value\| options[:use_gems] = value end opt.separator nil opt.on("--[no-]home", "Include documentation stored in ~/.rdoc.", "Defaults to true.") do \|value\| options[:use_home] = value end opt.separator nil opt.separator "Debug options:" opt.separator nil opt.on("--[no-]profile", "Run with the ruby profiler.") do \|value\| options[:profile] = value end opt.separator nil opt.on("--dump=CACHE", File, "Dump data from an ri cache or data file.") do \|value\| options[:dump_path] = value end end argv = ENV['RI'].to_s.split.concat argv opts.parse! argv options[:names] = argv options[:use_stdout] \|\|= !$stdout.tty? options[:use_stdout] \|\|= options[:interactive] options[:width] \|\|= 72 options rescue OptionParser::InvalidArgument, OptionParser::InvalidOption => e puts opts puts puts e exit 1 end ## # Runs the ri command line executable using +argv+ def self.run argv = ARGV options = process_args argv if options[:dump_path] then dump options[:dump_path] return end ri = new options ri.run end ## # Creates a new driver using +initial_options+ from ::process_args def initialize initial_options = {} @paging = false @classes = nil options = self.class.default_options.update(initial_options) @formatter_klass = options[:formatter] require 'profile' if options[:profile] @names = options[:names] @list = options[:list] @doc_dirs = [] @stores = [] RDoc::RI::Paths.each(options[:use_system], options[:use_site], options[:use_home], options[:use_gems], options[:extra_doc_dirs]) do \|path, type\| @doc_dirs << path store = RDoc::RI::Store.new path, type store.load_cache @stores << store end @list_doc_dirs = options[:list_doc_dirs] @interactive = options[:interactive] @server = options[:server] @use_stdout = options[:use_stdout] @show_all = options[:show_all] @width = options[:width] # pager process for jruby @jruby_pager_process = nil end ## # Adds paths for undocumented classes +also_in+ to +out+ def add_also_in out, also_in return if also_in.empty? out << RDoc::Markup::Rule.new(1) out << RDoc::Markup::Paragraph.new("Also found in:") paths = RDoc::Markup::Verbatim.new also_in.each do \|store\| paths.parts.push store.friendly_path, "\n" end out << paths end ## # Adds a class header to +out+ for class +name+ which is described in # +classes+. def add_class out, name, classes heading = if classes.all? { \|klass\| klass.module? } then name else superclass = classes.map do \|klass\| klass.superclass unless klass.module? end.compact.shift \|\| 'Object' superclass = superclass.full_name unless String === superclass "#{name} < #{superclass}" end out << RDoc::Markup::Heading.new(1, heading) out << RDoc::Markup::BlankLine.new end ## # Adds "(from ...)" to +out+ for +store+ def add_from out, store out << RDoc::Markup::Paragraph.new("(from #{store.friendly_path})") end ## # Adds +extends+ to +out+ def add_extends out, extends add_extension_modules out, 'Extended by', extends end ## # Adds a list of +extensions+ to this module of the given +type+ to +out+. # add_includes and add_extends call this, so you should use those directly. def add_extension_modules out, type, extensions return if extensions.empty? out << RDoc::Markup::Rule.new(1) out << RDoc::Markup::Heading.new(1, "#{type}:") extensions.each do \|modules, store\| if modules.length == 1 then add_extension_modules_single out, store, modules.first else add_extension_modules_multiple out, store, modules end end end ## # Renders multiple included +modules+ from +store+ to +out+. def add_extension_modules_multiple out, store, modules # :nodoc: out << RDoc::Markup::Paragraph.new("(from #{store.friendly_path})") wout, with = modules.partition { \|incl\| incl.comment.empty? } out << RDoc::Markup::BlankLine.new unless with.empty? with.each do \|incl\| out << RDoc::Markup::Paragraph.new(incl.name) out << RDoc::Markup::BlankLine.new out << incl.comment end unless wout.empty? then verb = RDoc::Markup::Verbatim.new wout.each do \|incl\| verb.push incl.name, "\n" end out << verb end end ## # Adds a single extension module +include+ from +store+ to +out+ def add_extension_modules_single out, store, include # :nodoc: name = include.name path = store.friendly_path out << RDoc::Markup::Paragraph.new("#{name} (from #{path})") if include.comment then out << RDoc::Markup::BlankLine.new out << include.comment end end ## # Adds +includes+ to +out+ def add_includes out, includes add_extension_modules out, 'Includes', includes end ## # Looks up the method +name+ and adds it to +out+ def add_method out, name filtered = lookup_method name method_out = method_document name, filtered out.concat method_out.parts end ## # Adds documentation for all methods in +klass+ to +out+ def add_method_documentation out, klass klass.method_list.each do \|method\| begin add_method out, method.full_name rescue NotFoundError next end end end ## # Adds a list of +methods+ to +out+ with a heading of +name+ def add_method_list out, methods, name return if methods.empty? out << RDoc::Markup::Heading.new(1, "#{name}:") out << RDoc::Markup::BlankLine.new if @use_stdout and !@interactive then out.concat methods.map { \|method\| RDoc::Markup::Verbatim.new method } else out << RDoc::Markup::IndentedParagraph.new(2, methods.join(', ')) end out << RDoc::Markup::BlankLine.new end ## # Returns ancestor classes of +klass+ def ancestors_of klass ancestors = [] unexamined = [klass] seen = [] loop do break if unexamined.empty? current = unexamined.shift seen << current stores = classes[current] break unless stores and not stores.empty? klasses = stores.map do \|store\| store.ancestors[current] end.flatten.uniq klasses = klasses - seen ancestors.concat klasses unexamined.concat klasses end ancestors.reverse end ## # For RubyGems backwards compatibility def class_cache # :nodoc: end ## # Builds a RDoc::Markup::Document from +found+, +klasess+ and +includes+ def class_document name, found, klasses, includes, extends also_in = [] out = RDoc::Markup::Document.new add_class out, name, klasses add_includes out, includes add_extends out, extends found.each do \|store, klass\| render_class out, store, klass, also_in end add_also_in out, also_in out end ## # Adds the class +comment+ to +out+. def class_document_comment out, comment # :nodoc: unless comment.empty? then out << RDoc::Markup::Rule.new(1) if comment.merged? then parts = comment.parts parts = parts.zip [RDoc::Markup::BlankLine.new] parts.length parts.flatten! parts.pop out.concat parts else out << comment end end end ## # Adds the constants from +klass+ to the Document +out+. def class_document_constants out, klass # :nodoc: return if klass.constants.empty? out << RDoc::Markup::Heading.new(1, "Constants:") out << RDoc::Markup::BlankLine.new list = RDoc::Markup::List.new :NOTE constants = klass.constants.sort_by { \|constant\| constant.name } list.items.concat constants.map { \|constant\| parts = constant.comment.parts if constant.comment parts << RDoc::Markup::Paragraph.new('[not documented]') if parts.empty? RDoc::Markup::ListItem.new(constant.name, parts) } out << list out << RDoc::Markup::BlankLine.new end ## # Hash mapping a known class or module to the stores it can be loaded from def classes return @classes if @classes @classes = {} @stores.each do \|store\| store.cache[:modules].each do \|mod\| # using default block causes searched-for modules to be added @classes[mod] \|\|= [] @classes[mod] << store end end @classes end ## # Returns the stores wherein +name+ is found along with the classes, # extends and includes that match it def classes_and_includes_and_extends_for name klasses = [] extends = [] includes = [] found = @stores.map do \|store\| begin klass = store.load_class name klasses << klass extends << [klass.extends, store] if klass.extends includes << [klass.includes, store] if klass.includes [store, klass] rescue RDoc::Store::MissingFileError end end.compact extends.reject! do \|modules,\| modules.empty? end includes.reject! do \|modules,\| modules.empty? end [found, klasses, includes, extends] end ## # Completes +name+ based on the caches. For Readline def complete name completions = [] klass, selector, method = parse_name name complete_klass name, klass, selector, method, completions complete_method name, klass, selector, completions completions.sort.uniq end def complete_klass name, klass, selector, method, completions # :nodoc: klasses = classes.keys # may need to include Foo when given Foo:: klass_name = method ? name : klass if name !~ /#\|\./ then completions.replace klasses.grep(/^#{Regexp.escape klass_name}[^:]$/) completions.concat klasses.grep(/^#{Regexp.escape name}[^:]$/) if name =~ /::$/ completions << klass if classes.key? klass # to complete a method name elsif selector then completions << klass if classes.key? klass elsif classes.key? klass_name then completions << klass_name end end def complete_method name, klass, selector, completions # :nodoc: if completions.include? klass and name =~ /#\|\.\|::/ then methods = list_methods_matching name if not methods.empty? then # remove Foo if given Foo:: and a method was found completions.delete klass elsif selector then # replace Foo with Foo:: as given completions.delete klass completions << "#{klass}#{selector}" end completions.concat methods end end ## # Converts +document+ to text and writes it to the pager def display document page do \|io\| f = formatter(io) f.width = @width if @width and f.respond_to?(:width) text = document.accept f io.write text end end ## # Outputs formatted RI data for class +name+. Groups undocumented classes def display_class name return if name =~ /#\|\./ found, klasses, includes, extends = classes_and_includes_and_extends_for name return if found.empty? out = class_document name, found, klasses, includes, extends display out end ## # Outputs formatted RI data for method +name+ def display_method name out = RDoc::Markup::Document.new add_method out, name display out end ## # Outputs formatted RI data for the class or method +name+. # # Returns true if +name+ was found, false if it was not an alternative could # be guessed, raises an error if +name+ couldn't be guessed. def display_name name if name =~ /\w:(\w\|$)/ then display_page name return true end return true if display_class name display_method name if name =~ /::\|#\|\./ true rescue NotFoundError matches = list_methods_matching name if name =~ /::\|#\|\./ matches = classes.keys.grep(/^#{Regexp.escape name}/) if matches.empty? raise if matches.empty? page do \|io\| io.puts "#{name} not found, maybe you meant:" io.puts io.puts matches.sort.join("\n") end false end ## # Displays each name in +name+ def display_names names names.each do \|name\| name = expand_name name display_name name end end ## # Outputs formatted RI data for page +name+. def display_page name store_name, page_name = name.split ':', 2 store = @stores.find { \|s\| s.source == store_name } return display_page_list store if page_name.empty? pages = store.cache[:pages] unless pages.include? page_name then found_names = pages.select do \|n\| n =~ /#{Regexp.escape page_name}\.[^.]+$/ end if found_names.length.zero? then return display_page_list store, pages elsif found_names.length > 1 then return display_page_list store, found_names, page_name end page_name = found_names.first end page = store.load_page page_name display page.comment end ## # Outputs a formatted RI page list for the pages in +store+. def display_page_list store, pages = store.cache[:pages], search = nil out = RDoc::Markup::Document.new title = if search then "#{search} pages" else 'Pages' end out << RDoc::Markup::Heading.new(1, "#{title} in #{store.friendly_path}") out << RDoc::Markup::BlankLine.new list = RDoc::Markup::List.new(:BULLET) pages.each do \|page\| list << RDoc::Markup::Paragraph.new(page) end out << list display out end def check_did_you_mean # :nodoc: if defined? DidYouMean::SpellChecker true else begin require 'did_you_mean' if defined? DidYouMean::SpellChecker true else false end rescue LoadError false end end end ## # Expands abbreviated klass +klass+ into a fully-qualified class. "Zl::Da" # will be expanded to Zlib::DataError. def expand_class klass class_names = classes.keys ary = class_names.grep(Regexp.new("\\A#{klass.gsub(/(?=::\|\z)/, '[^:]')}\\z")) if ary.length != 1 && ary.first != klass if check_did_you_mean suggestions = DidYouMean::SpellChecker.new(dictionary: class_names).correct(klass) raise NotFoundError.new(klass, suggestions) else raise NotFoundError, klass end end ary.first end ## # Expands the class portion of +name+ into a fully-qualified class. See # #expand_class. def expand_name name klass, selector, method = parse_name name return [selector, method].join if klass.empty? case selector when ':' then [find_store(klass), selector, method] else [expand_class(klass), selector, method] end.join end ## # Filters the methods in +found+ trying to find a match for +name+. def filter_methods found, name regexp = name_regexp name filtered = found.find_all do \|store, methods\| methods.any? { \|method\| method.full_name =~ regexp } end return filtered unless filtered.empty? found end ## # Yields items matching +name+ including the store they were found in, the # class being searched for, the class they were found in (an ancestor) the # types of methods to look up (from #method_type), and the method name being # searched for def find_methods name klass, selector, method = parse_name name types = method_type selector klasses = nil ambiguous = klass.empty? if ambiguous then klasses = classes.keys else klasses = ancestors_of klass klasses.unshift klass end methods = [] klasses.each do \|ancestor\| ancestors = classes[ancestor] next unless ancestors klass = ancestor if ambiguous ancestors.each do \|store\| methods << [store, klass, ancestor, types, method] end end methods = methods.sort_by do \|_, k, a, _, m\| [k, a, m].compact end methods.each do \|item\| yield(item) # :yields: store, klass, ancestor, types, method end self end ## # Finds the given +pager+ for jruby. Returns an IO if +pager+ was found. # # Returns false if +pager+ does not exist. # # Returns nil if the jruby JVM doesn't support ProcessBuilder redirection # (1.6 and older). def find_pager_jruby pager require 'java' require 'shellwords' return nil unless java.lang.ProcessBuilder.constants.include? :Redirect pager = Shellwords.split pager pb = java.lang.ProcessBuilder.new(pager) pb = pb.redirect_output java.lang.ProcessBuilder::Redirect::INHERIT @jruby_pager_process = pb.start input = @jruby_pager_process.output_stream io = input.to_io io.sync = true io rescue java.io.IOException false end ## # Finds a store that matches +name+ which can be the name of a gem, "ruby", # "home" or "site". # # See also RDoc::Store#source def find_store name @stores.each do \|store\| source = store.source return source if source == name return source if store.type == :gem and source =~ /^#{Regexp.escape name}-\d/ end raise RDoc::RI::Driver::NotFoundError, name end ## # Creates a new RDoc::Markup::Formatter. If a formatter is given with -f, # use it. If we're outputting to a pager, use bs, otherwise ansi. def formatter(io) if @formatter_klass then @formatter_klass.new elsif paging? or !io.tty? then RDoc::Markup::ToBs.new else RDoc::Markup::ToAnsi.new end end ## # Runs ri interactively using Readline if it is available. def interactive puts "\nEnter the method name you want to look up." if defined? Readline then Readline.completion_proc = method :complete puts "You can use tab to autocomplete." end puts "Enter a blank line to exit.\n\n" loop do name = if defined? Readline then Readline.readline ">> " else print ">> " $stdin.gets end return if name.nil? or name.empty? begin display_name expand_name(name.strip) rescue NotFoundError => e puts e.message end end rescue Interrupt exit end ## # Is +file+ in ENV['PATH']? def in_path? file return true if file =~ %r%\A/% and File.exist? file ENV['PATH'].split(File::PATH_SEPARATOR).any? do \|path\| File.exist? File.join(path, file) end end ## # Lists classes known to ri starting with +names+. If +names+ is empty all # known classes are shown. def list_known_classes names = [] classes = [] stores.each do \|store\| classes << store.module_names end classes = classes.flatten.uniq.sort unless names.empty? then filter = Regexp.union names.map { \|name\| /^#{name}/ } classes = classes.grep filter end page do \|io\| if paging? or io.tty? then if names.empty? then io.puts "Classes and Modules known to ri:" else io.puts "Classes and Modules starting with #{names.join ', '}:" end io.puts end io.puts classes.join("\n") end end ## # Returns an Array of methods matching +name+ def list_methods_matching name found = [] find_methods name do \|store, klass, ancestor, types, method\| if types == :instance or types == :both then methods = store.instance_methods[ancestor] if methods then matches = methods.grep(/^#{Regexp.escape method.to_s}/) matches = matches.map do \|match\| "#{klass}##{match}" end found.concat matches end end if types == :class or types == :both then methods = store.class_methods[ancestor] next unless methods matches = methods.grep(/^#{Regexp.escape method.to_s}/) matches = matches.map do \|match\| "#{klass}::#{match}" end found.concat matches end end found.uniq end ## # Loads RI data for method +name+ on +klass+ from +store+. +type+ and # +cache+ indicate if it is a class or instance method. def load_method store, cache, klass, type, name methods = store.send(cache)[klass] return unless methods method = methods.find do \|method_name\| method_name == name end return unless method store.load_method klass, "#{type}#{method}" rescue RDoc::Store::MissingFileError => e comment = RDoc::Comment.new("missing documentation at #{e.file}").parse method = RDoc::AnyMethod.new nil, name method.comment = comment method end ## # Returns an Array of RI data for methods matching +name+ def load_methods_matching name found = [] find_methods name do \|store, klass, ancestor, types, method\| methods = [] methods << load_method(store, :class_methods, ancestor, '::', method) if [:class, :both].include? types methods << load_method(store, :instance_methods, ancestor, '#', method) if [:instance, :both].include? types found << [store, methods.compact] end found.reject do \|path, methods\| methods.empty? end end ## # Returns a filtered list of methods matching +name+ def lookup_method name found = load_methods_matching name if found.empty? if check_did_you_mean methods = [] _, _, method_name = parse_name name find_methods name do \|store, klass, ancestor, types, method\| methods.push(store.class_methods[klass]) if [:class, :both].include? types methods.push(store.instance_methods[klass]) if [:instance, :both].include? types end methods = methods.uniq suggestions = DidYouMean::SpellChecker.new(dictionary: methods).correct(method_name) raise NotFoundError.new(name, suggestions) else raise NotFoundError, name end end filter_methods found, name end ## # Builds a RDoc::Markup::Document from +found+, +klasses+ and +includes+ def method_document name, filtered out = RDoc::Markup::Document.new out << RDoc::Markup::Heading.new(1, name) out << RDoc::Markup::BlankLine.new filtered.each do \|store, methods\| methods.each do \|method\| render_method out, store, method, name end end out end ## # Returns the type of method (:both, :instance, :class) for +selector+ def method_type selector case selector when '.', nil then :both when '#' then :instance else :class end end ## # Returns a regular expression for +name+ that will match an # RDoc::AnyMethod's name. def name_regexp name klass, type, name = parse_name name case type when '#', '::' then /^#{klass}#{type}#{Regexp.escape name}$/ else /^#{klass}(#\|::)#{Regexp.escape name}$/ end end ## # Paginates output through a pager program. def page if pager = setup_pager then begin yield pager ensure pager.close @jruby_pager_process.wait_for if @jruby_pager_process end else yield $stdout end rescue Errno::EPIPE ensure @paging = false end ## # Are we using a pager? def paging? @paging end ## # Extracts the class, selector and method name parts from +name+ like # Foo::Bar#baz. # # NOTE: Given Foo::Bar, Bar is considered a class even though it may be a # method def parse_name name parts = name.split(/(::?\|#\|\.)/) if parts.length == 1 then if parts.first =~ /^[a-z]\|^([%&+\/<>^`\|~-]\|\+@\|-@\|<<\|<=>?\|===?\|=>\|=~\|>>\|\[\]=?\|~@)$/ then type = '.' meth = parts.pop else type = nil meth = nil end elsif parts.length == 2 or parts.last =~ /::\|#\|\./ then type = parts.pop meth = nil elsif parts[1] == ':' then klass = parts.shift type = parts.shift meth = parts.join elsif parts[-2] != '::' or parts.last !~ /^[A-Z]/ then meth = parts.pop type = parts.pop end klass \|\|= parts.join [klass, type, meth] end ## # Renders the +klass+ from +store+ to +out+. If the klass has no # documentable items the class is added to +also_in+ instead. def render_class out, store, klass, also_in # :nodoc: comment = klass.comment # TODO the store's cache should always return an empty Array class_methods = store.class_methods[klass.full_name] \|\| [] instance_methods = store.instance_methods[klass.full_name] \|\| [] attributes = store.attributes[klass.full_name] \|\| [] if comment.empty? and instance_methods.empty? and class_methods.empty? then also_in << store return end add_from out, store class_document_comment out, comment if class_methods or instance_methods or not klass.constants.empty? then out << RDoc::Markup::Rule.new(1) end class_document_constants out, klass add_method_list out, class_methods, 'Class methods' add_method_list out, instance_methods, 'Instance methods' add_method_list out, attributes, 'Attributes' add_method_documentation out, klass if @show_all end def render_method out, store, method, name # :nodoc: out << RDoc::Markup::Paragraph.new("(from #{store.friendly_path})") unless name =~ /^#{Regexp.escape method.parent_name}/ then out << RDoc::Markup::Heading.new(3, "Implementation from #{method.parent_name}") end out << RDoc::Markup::Rule.new(1) render_method_arguments out, method.arglists render_method_superclass out, method if method.is_alias_for al = method.is_alias_for alias_for = store.load_method al.parent_name, "#{al.name_prefix}#{al.name}" render_method_comment out, method, alias_for else render_method_comment out, method end end def render_method_arguments out, arglists # :nodoc: return unless arglists arglists = arglists.chomp.split "\n" arglists = arglists.map { \|line\| line + "\n" } out << RDoc::Markup::Verbatim.new(arglists) out << RDoc::Markup::Rule.new(1) end def render_method_comment out, method, alias_for = nil# :nodoc: if alias_for unless method.comment.nil? or method.comment.empty? out << RDoc::Markup::BlankLine.new out << method.comment end out << RDoc::Markup::BlankLine.new out << RDoc::Markup::Paragraph.new("(This method is an alias for #{alias_for.full_name}.)") out << RDoc::Markup::BlankLine.new out << alias_for.comment out << RDoc::Markup::BlankLine.new else out << RDoc::Markup::BlankLine.new out << method.comment out << RDoc::Markup::BlankLine.new end end def render_method_superclass out, method # :nodoc: return unless method.respond_to?(:superclass_method) and method.superclass_method out << RDoc::Markup::BlankLine.new out << RDoc::Markup::Heading.new(4, "(Uses superclass method #{method.superclass_method})") out << RDoc::Markup::Rule.new(1) end ## # Looks up and displays ri data according to the options given. def run if @list_doc_dirs then puts @doc_dirs elsif @list then list_known_classes @names elsif @server then start_server elsif @interactive or @names.empty? then interactive else display_names @names end rescue NotFoundError => e abort e.message end ## # Sets up a pager program to pass output through. Tries the RI_PAGER and # PAGER environment variables followed by pager, less then more. def setup_pager return if @use_stdout jruby = RUBY_ENGINE == 'jruby' pagers = [ENV['RI_PAGER'], ENV['PAGER'], 'pager', 'less', 'more'] pagers.compact.uniq.each do \|pager\| next unless pager pager_cmd = pager.split.first next unless in_path? pager_cmd if jruby then case io = find_pager_jruby(pager) when nil then break when false then next else io end else io = IO.popen(pager, 'w') rescue next end next if $? and $?.pid == io.pid and $?.exited? # pager didn't work @paging = true return io end @use_stdout = true nil end ## # Starts a WEBrick server for ri. def start_server require 'webrick' server = WEBrick::HTTPServer.new :Port => @server extra_doc_dirs = @stores.map {\|s\| s.type == :extra ? s.path : nil}.compact server.mount '/', RDoc::Servlet, nil, extra_doc_dirs trap 'INT' do server.shutdown end trap 'TERM' do server.shutdown end server.start end end Back

Edit File : driver.rb | Size : 36.62 KB

# frozen_string_literal: true
require 'abbrev'
require 'optparse'

begin
  require 'readline'
rescue LoadError
end

begin
  require 'win32console'
rescue LoadError
end

require 'rdoc'

##
# For RubyGems backwards compatibility

require 'rdoc/ri/formatter'

##
# The RI driver implements the command-line ri tool.
#
# The driver supports:
# * loading RI data from:
#   * Ruby's standard library
#   * RubyGems
#   * ~/.rdoc
#   * A user-supplied directory
# * Paging output (uses RI_PAGER environment variable, PAGER environment
#   variable or the less, more and pager programs)
# * Interactive mode with tab-completion
# * Abbreviated names (ri Zl shows Zlib documentation)
# * Colorized output
# * Merging output from multiple RI data sources

class RDoc::RI::Driver

##
  # Base Driver error class

class Error < RDoc::RI::Error; end

##
  # Raised when a name isn't found in the ri data stores

class NotFoundError < Error

def initialize(klass, suggestions = nil) # :nodoc:
      @klass = klass
      @suggestions = suggestions
    end

##
    # Name that wasn't found

def name
      @klass
    end

def message # :nodoc:
      str = "Nothing known about #{@klass}"
      if @suggestions and !@suggestions.empty?
        str += "\nDid you mean?  #{@suggestions.join("\n               ")}"
      end
      str
    end
  end

##
  # Show all method documentation following a class or module

attr_accessor :show_all

##
  # An RDoc::RI::Store for each entry in the RI path

attr_accessor :stores

##
  # Controls the user of the pager vs $stdout

attr_accessor :use_stdout

##
  # Default options for ri

def self.default_options
    options = {}
    options[:interactive] = false
    options[:profile]     = false
    options[:show_all]    = false
    options[:use_stdout]  = !$stdout.tty?
    options[:width]       = 72

# By default all standard paths are used.
    options[:use_system]     = true
    options[:use_site]       = true
    options[:use_home]       = true
    options[:use_gems]       = true
    options[:extra_doc_dirs] = []

return options
  end

##
  # Dump +data_path+ using pp

def self.dump data_path
    require 'pp'

File.open data_path, 'rb' do |io|
      pp Marshal.load(io.read)
    end
  end

##
  # Parses +argv+ and returns a Hash of options

def self.process_args argv
    options = default_options

opts = OptionParser.new do |opt|
      opt.accept File do |file,|
        File.readable?(file) and not File.directory?(file) and file
      end

opt.program_name = File.basename $0
      opt.version = RDoc::VERSION
      opt.release = nil
      opt.summary_indent = ' ' * 4

opt.banner = <<-EOT
Usage: #{opt.program_name} [options] [name ...]

Where name can be:

Class | Module | Module::Class

Class::method | Class#method | Class.method | method

gem_name: | gem_name:README | gem_name:History

All class names may be abbreviated to their minimum unambiguous form.
If a name is ambiguous, all valid options will be listed.

A '.' matches either class or instance methods, while #method
matches only instance and ::method matches only class methods.

README and other files may be displayed by prefixing them with the gem name
they're contained in.  If the gem name is followed by a ':' all files in the
gem will be shown.  The file name extension may be omitted where it is
unambiguous.

For example:

#{opt.program_name} Fil
    #{opt.program_name} File
    #{opt.program_name} File.new
    #{opt.program_name} zip
    #{opt.program_name} rdoc:README

Note that shell quoting or escaping may be required for method names
containing punctuation:

#{opt.program_name} 'Array.[]'
    #{opt.program_name} compact\\!

To see the default directories #{opt.program_name} will search, run:

#{opt.program_name} --list-doc-dirs

Specifying the --system, --site, --home, --gems, or --doc-dir options
will limit ri to searching only the specified directories.

ri options may be set in the RI environment variable.

The ri pager can be set with the RI_PAGER environment variable
or the PAGER environment variable.
      EOT

opt.separator nil
      opt.separator "Options:"

opt.separator nil

opt.on("--[no-]interactive", "-i",
             "In interactive mode you can repeatedly",
             "look up methods with autocomplete.") do |interactive|
        options[:interactive] = interactive
      end

opt.separator nil

opt.on("--[no-]all", "-a",
             "Show all documentation for a class or",
             "module.") do |show_all|
        options[:show_all] = show_all
      end

opt.separator nil

opt.on("--[no-]list", "-l",
             "List classes ri knows about.") do |list|
        options[:list] = list
      end

opt.separator nil

opt.on("--[no-]pager",
             "Send output to a pager,",
             "rather than directly to stdout.") do |use_pager|
        options[:use_stdout] = !use_pager
      end

opt.separator nil

opt.on("-T",
             "Synonym for --no-pager.") do
        options[:use_stdout] = true
      end

opt.separator nil

opt.on("--width=WIDTH", "-w", OptionParser::DecimalInteger,
             "Set the width of the output.") do |width|
        options[:width] = width
      end

opt.separator nil

opt.on("--server[=PORT]", Integer,
             "Run RDoc server on the given port.",
             "The default port is 8214.") do |port|
        options[:server] = port || 8214
      end

opt.separator nil

formatters = RDoc::Markup.constants.grep(/^To[A-Z][a-z]+$/).sort
      formatters = formatters.sort.map do |formatter|
        formatter.to_s.sub('To', '').downcase
      end
      formatters -= %w[html label test] # remove useless output formats

opt.on("--format=NAME", "-f",
             "Use the selected formatter.  The default",
             "formatter is bs for paged output and ansi",
             "otherwise.  Valid formatters are:",
             "#{formatters.join(', ')}.", formatters) do |value|
        options[:formatter] = RDoc::Markup.const_get "To#{value.capitalize}"
      end

opt.separator nil

opt.on("--help", "-h",
             "Show help and exit.") do
        puts opts
        exit
      end

opt.separator nil

opt.on("--version", "-v",
             "Output version information and exit.") do
        puts "#{opts.program_name} #{opts.version}"
        exit
      end

opt.separator nil
      opt.separator "Data source options:"
      opt.separator nil

opt.on("--[no-]list-doc-dirs",
             "List the directories from which ri will",
             "source documentation on stdout and exit.") do |list_doc_dirs|
        options[:list_doc_dirs] = list_doc_dirs
      end

opt.separator nil

opt.on("--doc-dir=DIRNAME", "-d", Array,
             "List of directories from which to source",
             "documentation in addition to the standard",
             "directories.  May be repeated.") do |value|
        value.each do |dir|
          unless File.directory? dir then
            raise OptionParser::InvalidArgument, "#{dir} is not a directory"
          end

options[:extra_doc_dirs] << File.expand_path(dir)
        end
      end

opt.separator nil

opt.on("--no-standard-docs",
             "Do not include documentation from",
             "the Ruby standard library, site_lib,",
             "installed gems, or ~/.rdoc.",
             "Use with --doc-dir.") do
        options[:use_system] = false
        options[:use_site] = false
        options[:use_gems] = false
        options[:use_home] = false
      end

opt.separator nil

opt.on("--[no-]system",
             "Include documentation from Ruby's",
             "standard library.  Defaults to true.") do |value|
        options[:use_system] = value
      end

opt.separator nil

opt.on("--[no-]site",
             "Include documentation from libraries",
             "installed in site_lib.",
             "Defaults to true.") do |value|
        options[:use_site] = value
      end

opt.separator nil

opt.on("--[no-]gems",
             "Include documentation from RubyGems.",
             "Defaults to true.") do |value|
        options[:use_gems] = value
      end

opt.separator nil

opt.on("--[no-]home",
             "Include documentation stored in ~/.rdoc.",
             "Defaults to true.") do |value|
        options[:use_home] = value
      end

opt.separator nil
      opt.separator "Debug options:"
      opt.separator nil

opt.on("--[no-]profile",
             "Run with the ruby profiler.") do |value|
        options[:profile] = value
      end

opt.separator nil

opt.on("--dump=CACHE", File,
             "Dump data from an ri cache or data file.") do |value|
        options[:dump_path] = value
      end
    end

argv = ENV['RI'].to_s.split.concat argv

opts.parse! argv

options[:names] = argv

options[:use_stdout] ||= !$stdout.tty?
    options[:use_stdout] ||= options[:interactive]
    options[:width] ||= 72

options

rescue OptionParser::InvalidArgument, OptionParser::InvalidOption => e
    puts opts
    puts
    puts e
    exit 1
  end

##
  # Runs the ri command line executable using +argv+

def self.run argv = ARGV
    options = process_args argv

if options[:dump_path] then
      dump options[:dump_path]
      return
    end

ri = new options
    ri.run
  end

##
  # Creates a new driver using +initial_options+ from ::process_args

def initialize initial_options = {}
    @paging = false
    @classes = nil

options = self.class.default_options.update(initial_options)

@formatter_klass = options[:formatter]

require 'profile' if options[:profile]

@names = options[:names]
    @list = options[:list]

@doc_dirs = []
    @stores   = []

RDoc::RI::Paths.each(options[:use_system], options[:use_site],
                         options[:use_home], options[:use_gems],
                         *options[:extra_doc_dirs]) do |path, type|
      @doc_dirs << path

store = RDoc::RI::Store.new path, type
      store.load_cache
      @stores << store
    end

@list_doc_dirs = options[:list_doc_dirs]

@interactive = options[:interactive]
    @server      = options[:server]
    @use_stdout  = options[:use_stdout]
    @show_all    = options[:show_all]
    @width       = options[:width]

# pager process for jruby
    @jruby_pager_process = nil
  end

##
  # Adds paths for undocumented classes +also_in+ to +out+

def add_also_in out, also_in
    return if also_in.empty?

out << RDoc::Markup::Rule.new(1)
    out << RDoc::Markup::Paragraph.new("Also found in:")

paths = RDoc::Markup::Verbatim.new
    also_in.each do |store|
      paths.parts.push store.friendly_path, "\n"
    end
    out << paths
  end

##
  # Adds a class header to +out+ for class +name+ which is described in
  # +classes+.

def add_class out, name, classes
    heading = if classes.all? { |klass| klass.module? } then
                name
              else
                superclass = classes.map do |klass|
                  klass.superclass unless klass.module?
                end.compact.shift || 'Object'

superclass = superclass.full_name unless String === superclass

"#{name} < #{superclass}"
              end

out << RDoc::Markup::Heading.new(1, heading)
    out << RDoc::Markup::BlankLine.new
  end

##
  # Adds "(from ...)" to +out+ for +store+

def add_from out, store
    out << RDoc::Markup::Paragraph.new("(from #{store.friendly_path})")
  end

##
  # Adds +extends+ to +out+

def add_extends out, extends
    add_extension_modules out, 'Extended by', extends
  end

##
  # Adds a list of +extensions+ to this module of the given +type+ to +out+.
  # add_includes and add_extends call this, so you should use those directly.

def add_extension_modules out, type, extensions
    return if extensions.empty?

out << RDoc::Markup::Rule.new(1)
    out << RDoc::Markup::Heading.new(1, "#{type}:")

extensions.each do |modules, store|
      if modules.length == 1 then
        add_extension_modules_single out, store, modules.first
      else
        add_extension_modules_multiple out, store, modules
      end
    end
  end

##
  # Renders multiple included +modules+ from +store+ to +out+.

def add_extension_modules_multiple out, store, modules # :nodoc:
    out << RDoc::Markup::Paragraph.new("(from #{store.friendly_path})")

wout, with = modules.partition { |incl| incl.comment.empty? }

out << RDoc::Markup::BlankLine.new unless with.empty?

with.each do |incl|
      out << RDoc::Markup::Paragraph.new(incl.name)
      out << RDoc::Markup::BlankLine.new
      out << incl.comment
    end

unless wout.empty? then
      verb = RDoc::Markup::Verbatim.new

wout.each do |incl|
        verb.push incl.name, "\n"
      end

out << verb
    end
  end

##
  # Adds a single extension module +include+ from +store+ to +out+

def add_extension_modules_single out, store, include # :nodoc:
    name = include.name
    path = store.friendly_path
    out << RDoc::Markup::Paragraph.new("#{name} (from #{path})")

if include.comment then
      out << RDoc::Markup::BlankLine.new
      out << include.comment
    end
  end

##
  # Adds +includes+ to +out+

def add_includes out, includes
    add_extension_modules out, 'Includes', includes
  end

##
  # Looks up the method +name+ and adds it to +out+

def add_method out, name
    filtered   = lookup_method name

method_out = method_document name, filtered

out.concat method_out.parts
  end

##
  # Adds documentation for all methods in +klass+ to +out+

def add_method_documentation out, klass
    klass.method_list.each do |method|
      begin
        add_method out, method.full_name
      rescue NotFoundError
        next
      end
    end
  end

##
  # Adds a list of +methods+ to +out+ with a heading of +name+

def add_method_list out, methods, name
    return if methods.empty?

out << RDoc::Markup::Heading.new(1, "#{name}:")
    out << RDoc::Markup::BlankLine.new

if @use_stdout and !@interactive then
      out.concat methods.map { |method|
        RDoc::Markup::Verbatim.new method
      }
    else
      out << RDoc::Markup::IndentedParagraph.new(2, methods.join(', '))
    end

out << RDoc::Markup::BlankLine.new
  end

##
  # Returns ancestor classes of +klass+

def ancestors_of klass
    ancestors = []

unexamined = [klass]
    seen = []

loop do
      break if unexamined.empty?
      current = unexamined.shift
      seen << current

stores = classes[current]

break unless stores and not stores.empty?

klasses = stores.map do |store|
        store.ancestors[current]
      end.flatten.uniq

klasses = klasses - seen

ancestors.concat klasses
      unexamined.concat klasses
    end

ancestors.reverse
  end

##
  # For RubyGems backwards compatibility

def class_cache # :nodoc:
  end

##
  # Builds a RDoc::Markup::Document from +found+, +klasess+ and +includes+

def class_document name, found, klasses, includes, extends
    also_in = []

out = RDoc::Markup::Document.new

add_class out, name, klasses

add_includes out, includes
    add_extends  out, extends

found.each do |store, klass|
      render_class out, store, klass, also_in
    end

add_also_in out, also_in

out
  end

##
  # Adds the class +comment+ to +out+.

def class_document_comment out, comment # :nodoc:
    unless comment.empty? then
      out << RDoc::Markup::Rule.new(1)

if comment.merged? then
        parts = comment.parts
        parts = parts.zip [RDoc::Markup::BlankLine.new] * parts.length
        parts.flatten!
        parts.pop

out.concat parts
      else
        out << comment
      end
    end
  end

##
  # Adds the constants from +klass+ to the Document +out+.

def class_document_constants out, klass # :nodoc:
    return if klass.constants.empty?

out << RDoc::Markup::Heading.new(1, "Constants:")
    out << RDoc::Markup::BlankLine.new
    list = RDoc::Markup::List.new :NOTE

constants = klass.constants.sort_by { |constant| constant.name }

list.items.concat constants.map { |constant|
      parts = constant.comment.parts if constant.comment
      parts << RDoc::Markup::Paragraph.new('[not documented]') if
        parts.empty?

RDoc::Markup::ListItem.new(constant.name, *parts)
    }

out << list
    out << RDoc::Markup::BlankLine.new
  end

##
  # Hash mapping a known class or module to the stores it can be loaded from

def classes
    return @classes if @classes

@classes = {}

@stores.each do |store|
      store.cache[:modules].each do |mod|
        # using default block causes searched-for modules to be added
        @classes[mod] ||= []
        @classes[mod] << store
      end
    end

@classes
  end

##
  # Returns the stores wherein +name+ is found along with the classes,
  # extends and includes that match it

def classes_and_includes_and_extends_for name
    klasses = []
    extends = []
    includes = []

found = @stores.map do |store|
      begin
        klass = store.load_class name
        klasses  << klass
        extends  << [klass.extends,  store] if klass.extends
        includes << [klass.includes, store] if klass.includes
        [store, klass]
      rescue RDoc::Store::MissingFileError
      end
    end.compact

extends.reject!  do |modules,| modules.empty? end
    includes.reject! do |modules,| modules.empty? end

[found, klasses, includes, extends]
  end

##
  # Completes +name+ based on the caches.  For Readline

def complete name
    completions = []

klass, selector, method = parse_name name

complete_klass  name, klass, selector, method, completions
    complete_method name, klass, selector,         completions

completions.sort.uniq
  end

def complete_klass name, klass, selector, method, completions # :nodoc:
    klasses = classes.keys

# may need to include Foo when given Foo::
    klass_name = method ? name : klass

if name !~ /#|\./ then
      completions.replace klasses.grep(/^#{Regexp.escape klass_name}[^:]*$/)
      completions.concat klasses.grep(/^#{Regexp.escape name}[^:]*$/) if
        name =~ /::$/

completions << klass if classes.key? klass # to complete a method name
    elsif selector then
      completions << klass if classes.key? klass
    elsif classes.key? klass_name then
      completions << klass_name
    end
  end

def complete_method name, klass, selector, completions # :nodoc:
    if completions.include? klass and name =~ /#|\.|::/ then
      methods = list_methods_matching name

if not methods.empty? then
        # remove Foo if given Foo:: and a method was found
        completions.delete klass
      elsif selector then
        # replace Foo with Foo:: as given
        completions.delete klass
        completions << "#{klass}#{selector}"
      end

completions.concat methods
    end
  end

##
  # Converts +document+ to text and writes it to the pager

def display document
    page do |io|
      f = formatter(io)
      f.width = @width if @width and f.respond_to?(:width)
      text = document.accept f

io.write text
    end
  end

##
  # Outputs formatted RI data for class +name+.  Groups undocumented classes

def display_class name
    return if name =~ /#|\./

found, klasses, includes, extends =
      classes_and_includes_and_extends_for name

return if found.empty?

out = class_document name, found, klasses, includes, extends

display out
  end

##
  # Outputs formatted RI data for method +name+

def display_method name
    out = RDoc::Markup::Document.new

add_method out, name

display out
  end

##
  # Outputs formatted RI data for the class or method +name+.
  #
  # Returns true if +name+ was found, false if it was not an alternative could
  # be guessed, raises an error if +name+ couldn't be guessed.

def display_name name
    if name =~ /\w:(\w|$)/ then
      display_page name
      return true
    end

return true if display_class name

display_method name if name =~ /::|#|\./

true
  rescue NotFoundError
    matches = list_methods_matching name if name =~ /::|#|\./
    matches = classes.keys.grep(/^#{Regexp.escape name}/) if matches.empty?

raise if matches.empty?

page do |io|
      io.puts "#{name} not found, maybe you meant:"
      io.puts
      io.puts matches.sort.join("\n")
    end

false
  end

##
  # Displays each name in +name+

def display_names names
    names.each do |name|
      name = expand_name name

display_name name
    end
  end

##
  # Outputs formatted RI data for page +name+.

def display_page name
    store_name, page_name = name.split ':', 2

store = @stores.find { |s| s.source == store_name }

return display_page_list store if page_name.empty?

pages = store.cache[:pages]

unless pages.include? page_name then
      found_names = pages.select do |n|
        n =~ /#{Regexp.escape page_name}\.[^.]+$/
      end

if found_names.length.zero? then
        return display_page_list store, pages
      elsif found_names.length > 1 then
        return display_page_list store, found_names, page_name
      end

page_name = found_names.first
    end

page = store.load_page page_name

display page.comment
  end

##
  # Outputs a formatted RI page list for the pages in +store+.

def display_page_list store, pages = store.cache[:pages], search = nil
    out = RDoc::Markup::Document.new

title = if search then
              "#{search} pages"
            else
              'Pages'
            end

out << RDoc::Markup::Heading.new(1, "#{title} in #{store.friendly_path}")
    out << RDoc::Markup::BlankLine.new

list = RDoc::Markup::List.new(:BULLET)

pages.each do |page|
      list << RDoc::Markup::Paragraph.new(page)
    end

out << list

display out
  end

def check_did_you_mean # :nodoc:
    if defined? DidYouMean::SpellChecker
      true
    else
      begin
        require 'did_you_mean'
        if defined? DidYouMean::SpellChecker
          true
        else
          false
        end
      rescue LoadError
        false
      end
    end
  end

##
  # Expands abbreviated klass +klass+ into a fully-qualified class.  "Zl::Da"
  # will be expanded to Zlib::DataError.

def expand_class klass
    class_names = classes.keys
    ary = class_names.grep(Regexp.new("\\A#{klass.gsub(/(?=::|\z)/, '[^:]*')}\\z"))
    if ary.length != 1 && ary.first != klass
      if check_did_you_mean
        suggestions = DidYouMean::SpellChecker.new(dictionary: class_names).correct(klass)
        raise NotFoundError.new(klass, suggestions)
      else
        raise NotFoundError, klass
      end
    end
    ary.first
  end

##
  # Expands the class portion of +name+ into a fully-qualified class.  See
  # #expand_class.

def expand_name name
    klass, selector, method = parse_name name

return [selector, method].join if klass.empty?

case selector
    when ':' then
      [find_store(klass),   selector, method]
    else
      [expand_class(klass), selector, method]
    end.join
  end

##
  # Filters the methods in +found+ trying to find a match for +name+.

def filter_methods found, name
    regexp = name_regexp name

filtered = found.find_all do |store, methods|
      methods.any? { |method| method.full_name =~ regexp }
    end

return filtered unless filtered.empty?

found
  end

##
  # Yields items matching +name+ including the store they were found in, the
  # class being searched for, the class they were found in (an ancestor) the
  # types of methods to look up (from #method_type), and the method name being
  # searched for

def find_methods name
    klass, selector, method = parse_name name

types = method_type selector

klasses = nil
    ambiguous = klass.empty?

if ambiguous then
      klasses = classes.keys
    else
      klasses = ancestors_of klass
      klasses.unshift klass
    end

methods = []

klasses.each do |ancestor|
      ancestors = classes[ancestor]

next unless ancestors

klass = ancestor if ambiguous

ancestors.each do |store|
        methods << [store, klass, ancestor, types, method]
      end
    end

methods = methods.sort_by do |_, k, a, _, m|
      [k, a, m].compact
    end

methods.each do |item|
      yield(*item) # :yields: store, klass, ancestor, types, method
    end

self
  end

##
  # Finds the given +pager+ for jruby.  Returns an IO if +pager+ was found.
  #
  # Returns false if +pager+ does not exist.
  #
  # Returns nil if the jruby JVM doesn't support ProcessBuilder redirection
  # (1.6 and older).

def find_pager_jruby pager
    require 'java'
    require 'shellwords'

return nil unless java.lang.ProcessBuilder.constants.include? :Redirect

pager = Shellwords.split pager

pb = java.lang.ProcessBuilder.new(*pager)
    pb = pb.redirect_output java.lang.ProcessBuilder::Redirect::INHERIT

@jruby_pager_process = pb.start

input = @jruby_pager_process.output_stream

io = input.to_io
    io.sync = true
    io
  rescue java.io.IOException
    false
  end

##
  # Finds a store that matches +name+ which can be the name of a gem, "ruby",
  # "home" or "site".
  #
  # See also RDoc::Store#source

def find_store name
    @stores.each do |store|
      source = store.source

return source if source == name

return source if
        store.type == :gem and source =~ /^#{Regexp.escape name}-\d/
    end

raise RDoc::RI::Driver::NotFoundError, name
  end

##
  # Creates a new RDoc::Markup::Formatter.  If a formatter is given with -f,
  # use it.  If we're outputting to a pager, use bs, otherwise ansi.

def formatter(io)
    if @formatter_klass then
      @formatter_klass.new
    elsif paging? or !io.tty? then
      RDoc::Markup::ToBs.new
    else
      RDoc::Markup::ToAnsi.new
    end
  end

##
  # Runs ri interactively using Readline if it is available.

def interactive
    puts "\nEnter the method name you want to look up."

if defined? Readline then
      Readline.completion_proc = method :complete
      puts "You can use tab to autocomplete."
    end

puts "Enter a blank line to exit.\n\n"

loop do
      name = if defined? Readline then
               Readline.readline ">> "
             else
               print ">> "
               $stdin.gets
             end

return if name.nil? or name.empty?

begin
        display_name expand_name(name.strip)
      rescue NotFoundError => e
        puts e.message
      end
    end

rescue Interrupt
    exit
  end

##
  # Is +file+ in ENV['PATH']?

def in_path? file
    return true if file =~ %r%\A/% and File.exist? file

ENV['PATH'].split(File::PATH_SEPARATOR).any? do |path|
      File.exist? File.join(path, file)
    end
  end

##
  # Lists classes known to ri starting with +names+.  If +names+ is empty all
  # known classes are shown.

def list_known_classes names = []
    classes = []

stores.each do |store|
      classes << store.module_names
    end

classes = classes.flatten.uniq.sort

unless names.empty? then
      filter = Regexp.union names.map { |name| /^#{name}/ }

classes = classes.grep filter
    end

page do |io|
      if paging? or io.tty? then
        if names.empty? then
          io.puts "Classes and Modules known to ri:"
        else
          io.puts "Classes and Modules starting with #{names.join ', '}:"
        end
        io.puts
      end

io.puts classes.join("\n")
    end
  end

##
  # Returns an Array of methods matching +name+

def list_methods_matching name
    found = []

find_methods name do |store, klass, ancestor, types, method|
      if types == :instance or types == :both then
        methods = store.instance_methods[ancestor]

if methods then
          matches = methods.grep(/^#{Regexp.escape method.to_s}/)

matches = matches.map do |match|
            "#{klass}##{match}"
          end

found.concat matches
        end
      end

if types == :class or types == :both then
        methods = store.class_methods[ancestor]

next unless methods
        matches = methods.grep(/^#{Regexp.escape method.to_s}/)

matches = matches.map do |match|
          "#{klass}::#{match}"
        end

found.concat matches
      end
    end

found.uniq
  end

##
  # Loads RI data for method +name+ on +klass+ from +store+.  +type+ and
  # +cache+ indicate if it is a class or instance method.

def load_method store, cache, klass, type, name
    methods = store.send(cache)[klass]

return unless methods

method = methods.find do |method_name|
      method_name == name
    end

return unless method

store.load_method klass, "#{type}#{method}"
  rescue RDoc::Store::MissingFileError => e
    comment = RDoc::Comment.new("missing documentation at #{e.file}").parse

method = RDoc::AnyMethod.new nil, name
    method.comment = comment
    method
  end

##
  # Returns an Array of RI data for methods matching +name+

def load_methods_matching name
    found = []

find_methods name do |store, klass, ancestor, types, method|
      methods = []

methods << load_method(store, :class_methods, ancestor, '::',  method) if
        [:class, :both].include? types

methods << load_method(store, :instance_methods, ancestor, '#',  method) if
        [:instance, :both].include? types

found << [store, methods.compact]
    end

found.reject do |path, methods| methods.empty? end
  end

##
  # Returns a filtered list of methods matching +name+

def lookup_method name
    found = load_methods_matching name

if found.empty?
      if check_did_you_mean
        methods = []
        _, _, method_name = parse_name name
        find_methods name do |store, klass, ancestor, types, method|
          methods.push(*store.class_methods[klass]) if [:class, :both].include? types
          methods.push(*store.instance_methods[klass]) if [:instance, :both].include? types
        end
        methods = methods.uniq
        suggestions = DidYouMean::SpellChecker.new(dictionary: methods).correct(method_name)
        raise NotFoundError.new(name, suggestions)
      else
        raise NotFoundError, name
      end
    end

filter_methods found, name
  end

##
  # Builds a RDoc::Markup::Document from +found+, +klasses+ and +includes+

def method_document name, filtered
    out = RDoc::Markup::Document.new

out << RDoc::Markup::Heading.new(1, name)
    out << RDoc::Markup::BlankLine.new

filtered.each do |store, methods|
      methods.each do |method|
        render_method out, store, method, name
      end
    end

out
  end

##
  # Returns the type of method (:both, :instance, :class) for +selector+

def method_type selector
    case selector
    when '.', nil then :both
    when '#'      then :instance
    else               :class
    end
  end

##
  # Returns a regular expression for +name+ that will match an
  # RDoc::AnyMethod's name.

def name_regexp name
    klass, type, name = parse_name name

case type
    when '#', '::' then
      /^#{klass}#{type}#{Regexp.escape name}$/
    else
      /^#{klass}(#|::)#{Regexp.escape name}$/
    end
  end

##
  # Paginates output through a pager program.

def page
    if pager = setup_pager then
      begin
        yield pager
      ensure
        pager.close
        @jruby_pager_process.wait_for if @jruby_pager_process
      end
    else
      yield $stdout
    end
  rescue Errno::EPIPE
  ensure
    @paging = false
  end

##
  # Are we using a pager?

def paging?
    @paging
  end

##
  # Extracts the class, selector and method name parts from +name+ like
  # Foo::Bar#baz.
  #
  # NOTE: Given Foo::Bar, Bar is considered a class even though it may be a
  # method

def parse_name name
    parts = name.split(/(::?|#|\.)/)

if parts.length == 1 then
      if parts.first =~ /^[a-z]|^([%&*+\/<>^`|~-]|\+@|-@|<<|<=>?|===?|=>|=~|>>|\[\]=?|~@)$/ then
        type = '.'
        meth = parts.pop
      else
        type = nil
        meth = nil
      end
    elsif parts.length == 2 or parts.last =~ /::|#|\./ then
      type = parts.pop
      meth = nil
    elsif parts[1] == ':' then
      klass = parts.shift
      type  = parts.shift
      meth  = parts.join
    elsif parts[-2] != '::' or parts.last !~ /^[A-Z]/ then
      meth = parts.pop
      type = parts.pop
    end

klass ||= parts.join

[klass, type, meth]
  end

##
  # Renders the +klass+ from +store+ to +out+.  If the klass has no
  # documentable items the class is added to +also_in+ instead.

def render_class out, store, klass, also_in # :nodoc:
    comment = klass.comment
    # TODO the store's cache should always return an empty Array
    class_methods    = store.class_methods[klass.full_name]    || []
    instance_methods = store.instance_methods[klass.full_name] || []
    attributes       = store.attributes[klass.full_name]       || []

if comment.empty? and
       instance_methods.empty? and class_methods.empty? then
      also_in << store
      return
    end

add_from out, store

class_document_comment out, comment

if class_methods or instance_methods or not klass.constants.empty? then
      out << RDoc::Markup::Rule.new(1)
    end

class_document_constants out, klass

add_method_list out, class_methods,    'Class methods'
    add_method_list out, instance_methods, 'Instance methods'
    add_method_list out, attributes,       'Attributes'

add_method_documentation out, klass if @show_all
  end

def render_method out, store, method, name # :nodoc:
    out << RDoc::Markup::Paragraph.new("(from #{store.friendly_path})")

unless name =~ /^#{Regexp.escape method.parent_name}/ then
      out << RDoc::Markup::Heading.new(3, "Implementation from #{method.parent_name}")
    end

out << RDoc::Markup::Rule.new(1)

render_method_arguments out, method.arglists
    render_method_superclass out, method
    if method.is_alias_for
      al = method.is_alias_for
      alias_for = store.load_method al.parent_name, "#{al.name_prefix}#{al.name}"
      render_method_comment out, method, alias_for
    else
      render_method_comment out, method
    end
  end

def render_method_arguments out, arglists # :nodoc:
    return unless arglists

arglists = arglists.chomp.split "\n"
    arglists = arglists.map { |line| line + "\n" }
    out << RDoc::Markup::Verbatim.new(*arglists)
    out << RDoc::Markup::Rule.new(1)
  end

def render_method_comment out, method, alias_for = nil# :nodoc:
    if alias_for
      unless method.comment.nil? or method.comment.empty?
        out << RDoc::Markup::BlankLine.new
        out << method.comment
      end
      out << RDoc::Markup::BlankLine.new
      out << RDoc::Markup::Paragraph.new("(This method is an alias for #{alias_for.full_name}.)")
      out << RDoc::Markup::BlankLine.new
      out << alias_for.comment
      out << RDoc::Markup::BlankLine.new
    else
      out << RDoc::Markup::BlankLine.new
      out << method.comment
      out << RDoc::Markup::BlankLine.new
    end
  end

def render_method_superclass out, method # :nodoc:
    return unless
      method.respond_to?(:superclass_method) and method.superclass_method

out << RDoc::Markup::BlankLine.new
    out << RDoc::Markup::Heading.new(4, "(Uses superclass method #{method.superclass_method})")
    out << RDoc::Markup::Rule.new(1)
  end

##
  # Looks up and displays ri data according to the options given.

def run
    if @list_doc_dirs then
      puts @doc_dirs
    elsif @list then
      list_known_classes @names
    elsif @server then
      start_server
    elsif @interactive or @names.empty? then
      interactive
    else
      display_names @names
    end
  rescue NotFoundError => e
    abort e.message
  end

##
  # Sets up a pager program to pass output through.  Tries the RI_PAGER and
  # PAGER environment variables followed by pager, less then more.

def setup_pager
    return if @use_stdout

jruby = RUBY_ENGINE == 'jruby'

pagers = [ENV['RI_PAGER'], ENV['PAGER'], 'pager', 'less', 'more']

pagers.compact.uniq.each do |pager|
      next unless pager

pager_cmd = pager.split.first

next unless in_path? pager_cmd

if jruby then
        case io = find_pager_jruby(pager)
        when nil   then break
        when false then next
        else            io
        end
      else
        io = IO.popen(pager, 'w') rescue next
      end

next if $? and $?.pid == io.pid and $?.exited? # pager didn't work

@paging = true

return io
    end

@use_stdout = true

nil
  end

##
  # Starts a WEBrick server for ri.

def start_server
    require 'webrick'

server = WEBrick::HTTPServer.new :Port => @server

extra_doc_dirs = @stores.map {|s| s.type == :extra ? s.path : nil}.compact

server.mount '/', RDoc::Servlet, nil, extra_doc_dirs

trap 'INT'  do server.shutdown end
    trap 'TERM' do server.shutdown end

server.start
  end

end

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