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require 'cgi'
##
# A Context is something that can hold modules, classes, methods, attributes,
# aliases, requires, and includes. Classes, modules, and files are all
# Contexts.
class RDoc::Context < RDoc::CodeObject
include Comparable
##
# Types of methods
TYPES = %w[class instance]
##
# If a context has these titles it will be sorted in this order.
TOMDOC_TITLES = [nil, 'Public', 'Internal', 'Deprecated'] # :nodoc:
TOMDOC_TITLES_SORT = TOMDOC_TITLES.sort_by { |title| title.to_s } # :nodoc:
##
# Class/module aliases
attr_reader :aliases
##
# All attr* methods
attr_reader :attributes
##
# Block params to be used in the next MethodAttr parsed under this context
attr_accessor :block_params
##
# Constants defined
attr_reader :constants
##
# Sets the current documentation section of documentation
attr_writer :current_section
##
# Files this context is found in
attr_reader :in_files
##
# Modules this context includes
attr_reader :includes
##
# Modules this context is extended with
attr_reader :extends
##
# Methods defined in this context
attr_reader :method_list
##
# Name of this class excluding namespace. See also full_name
attr_reader :name
##
# Files this context requires
attr_reader :requires
##
# Use this section for the next method, attribute or constant added.
attr_accessor :temporary_section
##
# Hash <tt>old_name => [aliases]</tt>, for aliases
# that haven't (yet) been resolved to a method/attribute.
# (Not to be confused with the aliases of the context.)
attr_accessor :unmatched_alias_lists
##
# Aliases that could not be resolved.
attr_reader :external_aliases
##
# Current visibility of this context
attr_accessor :visibility
##
# Hash of registered methods. Attributes are also registered here,
# twice if they are RW.
attr_reader :methods_hash
##
# Params to be used in the next MethodAttr parsed under this context
attr_accessor :params
##
# Hash of registered constants.
attr_reader :constants_hash
##
# Creates an unnamed empty context with public current visibility
def initialize
super
@in_files = []
@name ||= "unknown"
@parent = nil
@visibility = :public
@current_section = Section.new self, nil, nil
@sections = { nil => @current_section }
@temporary_section = nil
@classes = {}
@modules = {}
initialize_methods_etc
end
##
# Sets the defaults for methods and so-forth
def initialize_methods_etc
@method_list = []
@attributes = []
@aliases = []
@requires = []
@includes = []
@extends = []
@constants = []
@external_aliases = []
# This Hash maps a method name to a list of unmatched aliases (aliases of
# a method not yet encountered).
@unmatched_alias_lists = {}
@methods_hash = {}
@constants_hash = {}
@params = nil
@store ||= nil
end
##
# Contexts are sorted by full_name
def <=>(other)
full_name <=> other.full_name
end
##
# Adds an item of type +klass+ with the given +name+ and +comment+ to the
# context.
#
# Currently only RDoc::Extend and RDoc::Include are supported.
def add klass, name, comment
if RDoc::Extend == klass then
ext = RDoc::Extend.new name, comment
add_extend ext
elsif RDoc::Include == klass then
incl = RDoc::Include.new name, comment
add_include incl
else
raise NotImplementedError, "adding a #{klass} is not implemented"
end
end
##
# Adds +an_alias+ that is automatically resolved
def add_alias an_alias
return an_alias unless @document_self
method_attr = find_method(an_alias.old_name, an_alias.singleton) ||
find_attribute(an_alias.old_name, an_alias.singleton)
if method_attr then
method_attr.add_alias an_alias, self
else
add_to @external_aliases, an_alias
unmatched_alias_list =
@unmatched_alias_lists[an_alias.pretty_old_name] ||= []
unmatched_alias_list.push an_alias
end
an_alias
end
##
# Adds +attribute+ if not already there. If it is (as method(s) or attribute),
# updates the comment if it was empty.
#
# The attribute is registered only if it defines a new method.
# For instance, <tt>attr_reader :foo</tt> will not be registered
# if method +foo+ exists, but <tt>attr_accessor :foo</tt> will be registered
# if method +foo+ exists, but <tt>foo=</tt> does not.
def add_attribute attribute
return attribute unless @document_self
# mainly to check for redefinition of an attribute as a method
# TODO find a policy for 'attr_reader :foo' + 'def foo=()'
register = false
key = nil
if attribute.rw.index 'R' then
key = attribute.pretty_name
known = @methods_hash[key]
if known then
known.comment = attribute.comment if known.comment.empty?
elsif registered = @methods_hash[attribute.pretty_name << '='] and
RDoc::Attr === registered then
registered.rw = 'RW'
else
@methods_hash[key] = attribute
register = true
end
end
if attribute.rw.index 'W' then
key = attribute.pretty_name << '='
known = @methods_hash[key]
if known then
known.comment = attribute.comment if known.comment.empty?
elsif registered = @methods_hash[attribute.pretty_name] and
RDoc::Attr === registered then
registered.rw = 'RW'
else
@methods_hash[key] = attribute
register = true
end
end
if register then
attribute.visibility = @visibility
add_to @attributes, attribute
resolve_aliases attribute
end
attribute
end
##
# Adds a class named +given_name+ with +superclass+.
#
# Both +given_name+ and +superclass+ may contain '::', and are
# interpreted relative to the +self+ context. This allows handling correctly
# examples like these:
# class RDoc::Gauntlet < Gauntlet
# module Mod
# class Object # implies < ::Object
# class SubObject < Object # this is _not_ ::Object
#
# Given <tt>class Container::Item</tt> RDoc assumes +Container+ is a module
# unless it later sees <tt>class Container</tt>. +add_class+ automatically
# upgrades +given_name+ to a class in this case.
def add_class class_type, given_name, superclass = '::Object'
# superclass +nil+ is passed by the C parser in the following cases:
# - registering Object in 1.8 (correct)
# - registering BasicObject in 1.9 (correct)
# - registering RubyVM in 1.9 in iseq.c (incorrect: < Object in vm.c)
#
# If we later find a superclass for a registered class with a nil
# superclass, we must honor it.
# find the name & enclosing context
if given_name =~ /^:+(\w+)$/ then
full_name = $1
enclosing = top_level
name = full_name.split(/:+/).last
else
full_name = child_name given_name
if full_name =~ /^(.+)::(\w+)$/ then
name = $2
ename = $1
enclosing = @store.classes_hash[ename] || @store.modules_hash[ename]
# HACK: crashes in actionpack/lib/action_view/helpers/form_helper.rb (metaprogramming)
unless enclosing then
# try the given name at top level (will work for the above example)
enclosing = @store.classes_hash[given_name] ||
@store.modules_hash[given_name]
return enclosing if enclosing
# not found: create the parent(s)
names = ename.split('::')
enclosing = self
names.each do |n|
enclosing = enclosing.classes_hash[n] ||
enclosing.modules_hash[n] ||
enclosing.add_module(RDoc::NormalModule, n)
end
end
else
name = full_name
enclosing = self
end
end
# fix up superclass
superclass = nil if full_name == 'BasicObject'
superclass = nil if full_name == 'Object' and defined?(::BasicObject)
superclass = '::BasicObject' if
defined?(::BasicObject) and full_name == 'Object'
# find the superclass full name
if superclass then
if superclass =~ /^:+/ then
superclass = $' #'
else
if superclass =~ /^(\w+):+(.+)$/ then
suffix = $2
mod = find_module_named($1)
superclass = mod.full_name + '::' + suffix if mod
else
mod = find_module_named(superclass)
superclass = mod.full_name if mod
end
end
# did we believe it was a module?
mod = @store.modules_hash.delete superclass
upgrade_to_class mod, RDoc::NormalClass, mod.parent if mod
# e.g., Object < Object
superclass = nil if superclass == full_name
end
klass = @store.classes_hash[full_name]
if klass then
# if TopLevel, it may not be registered in the classes:
enclosing.classes_hash[name] = klass
# update the superclass if needed
if superclass then
existing = klass.superclass
existing = existing.full_name unless existing.is_a?(String) if existing
if existing.nil? ||
(existing == 'Object' && superclass != 'Object') then
klass.superclass = superclass
end
end
else
# this is a new class
mod = @store.modules_hash.delete full_name
if mod then
klass = upgrade_to_class mod, RDoc::NormalClass, enclosing
klass.superclass = superclass unless superclass.nil?
else
klass = class_type.new name, superclass
enclosing.add_class_or_module(klass, enclosing.classes_hash,
@store.classes_hash)
end
end
klass.parent = self
klass
end
##
# Adds the class or module +mod+ to the modules or
# classes Hash +self_hash+, and to +all_hash+ (either
# <tt>TopLevel::modules_hash</tt> or <tt>TopLevel::classes_hash</tt>),
# unless #done_documenting is +true+. Sets the #parent of +mod+
# to +self+, and its #section to #current_section. Returns +mod+.
def add_class_or_module mod, self_hash, all_hash
mod.section = current_section # TODO declaring context? something is
# wrong here...
mod.parent = self
mod.store = @store
unless @done_documenting then
self_hash[mod.name] = mod
# this must be done AFTER adding mod to its parent, so that the full
# name is correct:
all_hash[mod.full_name] = mod
end
mod
end
##
# Adds +constant+ if not already there. If it is, updates the comment,
# value and/or is_alias_for of the known constant if they were empty/nil.
def add_constant constant
return constant unless @document_self
# HACK: avoid duplicate 'PI' & 'E' in math.c (1.8.7 source code)
# (this is a #ifdef: should be handled by the C parser)
known = @constants_hash[constant.name]
if known then
known.comment = constant.comment if known.comment.empty?
known.value = constant.value if
known.value.nil? or known.value.strip.empty?
known.is_alias_for ||= constant.is_alias_for
else
@constants_hash[constant.name] = constant
add_to @constants, constant
end
constant
end
##
# Adds included module +include+ which should be an RDoc::Include
def add_include include
add_to @includes, include
include
end
##
# Adds extension module +ext+ which should be an RDoc::Extend
def add_extend ext
add_to @extends, ext
ext
end
##
# Adds +method+ if not already there. If it is (as method or attribute),
# updates the comment if it was empty.
def add_method method
return method unless @document_self
# HACK: avoid duplicate 'new' in io.c & struct.c (1.8.7 source code)
key = method.pretty_name
known = @methods_hash[key]
if known then
if @store then # otherwise we are loading
known.comment = method.comment if known.comment.empty?
previously = ", previously in #{known.file}" unless
method.file == known.file
@store.rdoc.options.warn \
"Duplicate method #{known.full_name} in #{method.file}#{previously}"
end
else
@methods_hash[key] = method
method.visibility = @visibility
add_to @method_list, method
resolve_aliases method
end
method
end
##
# Adds a module named +name+. If RDoc already knows +name+ is a class then
# that class is returned instead. See also #add_class.
def add_module(class_type, name)
mod = @classes[name] || @modules[name]
return mod if mod
full_name = child_name name
mod = @store.modules_hash[full_name] || class_type.new(name)
add_class_or_module mod, @modules, @store.modules_hash
end
##
# Adds an alias from +from+ (a class or module) to +name+ which was defined
# in +file+.
def add_module_alias from, name, file
return from if @done_documenting
to_name = child_name name
# if we already know this name, don't register an alias:
# see the metaprogramming in lib/active_support/basic_object.rb,
# where we already know BasicObject is a class when we find
# BasicObject = BlankSlate
return from if @store.find_class_or_module to_name
to = from.dup
to.name = name
to.full_name = nil
if to.module? then
@store.modules_hash[to_name] = to
@modules[name] = to
else
@store.classes_hash[to_name] = to
@classes[name] = to
end
# Registers a constant for this alias. The constant value and comment
# will be updated later, when the Ruby parser adds the constant
const = RDoc::Constant.new name, nil, to.comment
const.record_location file
const.is_alias_for = from
add_constant const
to
end
##
# Adds +require+ to this context's top level
def add_require(require)
return require unless @document_self
if RDoc::TopLevel === self then
add_to @requires, require
else
parent.add_require require
end
end
##
# Returns a section with +title+, creating it if it doesn't already exist.
# +comment+ will be appended to the section's comment.
#
# A section with a +title+ of +nil+ will return the default section.
#
# See also RDoc::Context::Section
def add_section title, comment = nil
if section = @sections[title] then
section.add_comment comment if comment
else
section = Section.new self, title, comment
@sections[title] = section
end
section
end
##
# Adds +thing+ to the collection +array+
def add_to array, thing
array << thing if @document_self
thing.parent = self
thing.store = @store if @store
thing.section = current_section
end
##
# Is there any content?
#
# This means any of: comment, aliases, methods, attributes, external
# aliases, require, constant.
#
# Includes and extends are also checked unless <tt>includes == false</tt>.
def any_content(includes = true)
@any_content ||= !(
@comment.empty? &&
@method_list.empty? &&
@attributes.empty? &&
@aliases.empty? &&
@external_aliases.empty? &&
@requires.empty? &&
@constants.empty?
)
@any_content || (includes && !(@includes + @extends).empty? )
end
##
# Creates the full name for a child with +name+
def child_name name
if name =~ /^:+/
$' #'
elsif RDoc::TopLevel === self then
name
else
"#{self.full_name}::#{name}"
end
end
##
# Class attributes
def class_attributes
@class_attributes ||= attributes.select { |a| a.singleton }
end
##
# Class methods
def class_method_list
@class_method_list ||= method_list.select { |a| a.singleton }
end
##
# Array of classes in this context
def classes
@classes.values
end
##
# All classes and modules in this namespace
def classes_and_modules
classes + modules
end
##
# Hash of classes keyed by class name
def classes_hash
@classes
end
##
# The current documentation section that new items will be added to. If
# temporary_section is available it will be used.
def current_section
if section = @temporary_section then
@temporary_section = nil
else
section = @current_section
end
section
end
##
# Is part of this thing was defined in +file+?
def defined_in?(file)
@in_files.include?(file)
end
def display(method_attr) # :nodoc:
if method_attr.is_a? RDoc::Attr
"#{method_attr.definition} #{method_attr.pretty_name}"
else
"method #{method_attr.pretty_name}"
end
end
##
# Iterator for ancestors for duck-typing. Does nothing. See
# RDoc::ClassModule#each_ancestor.
#
# This method exists to make it easy to work with Context subclasses that
# aren't part of RDoc.
def each_ancestor # :nodoc:
end
##
# Iterator for attributes
def each_attribute # :yields: attribute
@attributes.each { |a| yield a }
end
##
# Iterator for classes and modules
def each_classmodule(&block) # :yields: module
classes_and_modules.sort.each(&block)
end
##
# Iterator for constants
def each_constant # :yields: constant
@constants.each {|c| yield c}
end
##
# Iterator for included modules
def each_include # :yields: include
@includes.each do |i| yield i end
end
##
# Iterator for extension modules
def each_extend # :yields: extend
@extends.each do |e| yield e end
end
##
# Iterator for methods
def each_method # :yields: method
return enum_for __method__ unless block_given?
@method_list.sort.each { |m| yield m }
end
##
# Iterator for each section's contents sorted by title. The +section+, the
# section's +constants+ and the sections +attributes+ are yielded. The
# +constants+ and +attributes+ collections are sorted.
#
# To retrieve methods in a section use #methods_by_type with the optional
# +section+ parameter.
#
# NOTE: Do not edit collections yielded by this method
def each_section # :yields: section, constants, attributes
return enum_for __method__ unless block_given?
constants = @constants.group_by do |constant| constant.section end
attributes = @attributes.group_by do |attribute| attribute.section end
constants.default = []
attributes.default = []
sort_sections.each do |section|
yield section, constants[section].sort, attributes[section].sort
end
end
##
# Finds an attribute +name+ with singleton value +singleton+.
def find_attribute(name, singleton)
name = $1 if name =~ /^(.*)=$/
@attributes.find { |a| a.name == name && a.singleton == singleton }
end
##
# Finds an attribute with +name+ in this context
def find_attribute_named(name)
case name
when /\A#/ then
find_attribute name[1..-1], false
when /\A::/ then
find_attribute name[2..-1], true
else
@attributes.find { |a| a.name == name }
end
end
##
# Finds a class method with +name+ in this context
def find_class_method_named(name)
@method_list.find { |meth| meth.singleton && meth.name == name }
end
##
# Finds a constant with +name+ in this context
def find_constant_named(name)
@constants.find {|m| m.name == name}
end
##
# Find a module at a higher scope
def find_enclosing_module_named(name)
parent && parent.find_module_named(name)
end
##
# Finds an external alias +name+ with singleton value +singleton+.
def find_external_alias(name, singleton)
@external_aliases.find { |m| m.name == name && m.singleton == singleton }
end
##
# Finds an external alias with +name+ in this context
def find_external_alias_named(name)
case name
when /\A#/ then
find_external_alias name[1..-1], false
when /\A::/ then
find_external_alias name[2..-1], true
else
@external_aliases.find { |a| a.name == name }
end
end
##
# Finds a file with +name+ in this context
def find_file_named name
@store.find_file_named name
end
##
# Finds an instance method with +name+ in this context
def find_instance_method_named(name)
@method_list.find { |meth| !meth.singleton && meth.name == name }
end
##
# Finds a method, constant, attribute, external alias, module or file
# named +symbol+ in this context.
def find_local_symbol(symbol)
find_method_named(symbol) or
find_constant_named(symbol) or
find_attribute_named(symbol) or
find_external_alias_named(symbol) or
find_module_named(symbol) or
find_file_named(symbol)
end
##
# Finds a method named +name+ with singleton value +singleton+.
def find_method(name, singleton)
@method_list.find { |m| m.name == name && m.singleton == singleton }
end
##
# Finds a instance or module method with +name+ in this context
def find_method_named(name)
case name
when /\A#/ then
find_method name[1..-1], false
when /\A::/ then
find_method name[2..-1], true
else
@method_list.find { |meth| meth.name == name }
end
end
##
# Find a module with +name+ using ruby's scoping rules
def find_module_named(name)
res = @modules[name] || @classes[name]
return res if res
return self if self.name == name
find_enclosing_module_named name
end
##
# Look up +symbol+, first as a module, then as a local symbol.
def find_symbol(symbol)
find_symbol_module(symbol) || find_local_symbol(symbol)
end
##
# Look up a module named +symbol+.
def find_symbol_module(symbol)
result = nil
# look for a class or module 'symbol'
case symbol
when /^::/ then
result = @store.find_class_or_module symbol
when /^(\w+):+(.+)$/
suffix = $2
top = $1
searched = self
while searched do
mod = searched.find_module_named(top)
break unless mod
result = @store.find_class_or_module "#{mod.full_name}::#{suffix}"
break if result || searched.is_a?(RDoc::TopLevel)
searched = searched.parent
end
else
searched = self
while searched do
result = searched.find_module_named(symbol)
break if result || searched.is_a?(RDoc::TopLevel)
searched = searched.parent
end
end
result
end
##
# The full name for this context. This method is overridden by subclasses.
def full_name
'(unknown)'
end
##
# Does this context and its methods and constants all have documentation?
#
# (Yes, fully documented doesn't mean everything.)
def fully_documented?
documented? and
attributes.all? { |a| a.documented? } and
method_list.all? { |m| m.documented? } and
constants.all? { |c| c.documented? }
end
##
# URL for this with a +prefix+
def http_url(prefix)
path = name_for_path
path = path.gsub(/<<\s*(\w*)/, 'from-\1') if path =~ /<</
path = [prefix] + path.split('::')
File.join(*path.compact) + '.html'
end
##
# Instance attributes
def instance_attributes
@instance_attributes ||= attributes.reject { |a| a.singleton }
end
##
# Instance methods
#--
# TODO rename to instance_methods
def instance_method_list
@instance_method_list ||= method_list.reject { |a| a.singleton }
end
##
# Breaks method_list into a nested hash by type (<tt>'class'</tt> or
# <tt>'instance'</tt>) and visibility (+:public+, +:protected+, +:private+).
#
# If +section+ is provided only methods in that RDoc::Context::Section will
# be returned.
def methods_by_type section = nil
methods = {}
TYPES.each do |type|
visibilities = {}
RDoc::VISIBILITIES.each do |vis|
visibilities[vis] = []
end
methods[type] = visibilities
end
each_method do |method|
next if section and not method.section == section
methods[method.type][method.visibility] << method
end
methods
end
##
# Yields AnyMethod and Attr entries matching the list of names in +methods+.
def methods_matching(methods, singleton = false, &block)
(@method_list + @attributes).each do |m|
yield m if methods.include?(m.name) and m.singleton == singleton
end
each_ancestor do |parent|
parent.methods_matching(methods, singleton, &block)
end
end
##
# Array of modules in this context
def modules
@modules.values
end
##
# Hash of modules keyed by module name
def modules_hash
@modules
end
##
# Name to use to generate the url.
# <tt>#full_name</tt> by default.
def name_for_path
full_name
end
##
# Changes the visibility for new methods to +visibility+
def ongoing_visibility=(visibility)
@visibility = visibility
end
##
# Record +top_level+ as a file +self+ is in.
def record_location(top_level)
@in_files << top_level unless @in_files.include?(top_level)
end
##
# Should we remove this context from the documentation?
#
# The answer is yes if:
# * #received_nodoc is +true+
# * #any_content is +false+ (not counting includes)
# * All #includes are modules (not a string), and their module has
# <tt>#remove_from_documentation? == true</tt>
# * All classes and modules have <tt>#remove_from_documentation? == true</tt>
def remove_from_documentation?
@remove_from_documentation ||=
@received_nodoc &&
!any_content(false) &&
@includes.all? { |i| !i.module.is_a?(String) && i.module.remove_from_documentation? } &&
classes_and_modules.all? { |cm| cm.remove_from_documentation? }
end
##
# Removes methods and attributes with a visibility less than +min_visibility+.
#--
# TODO mark the visibility of attributes in the template (if not public?)
def remove_invisible min_visibility
return if [:private, :nodoc].include? min_visibility
remove_invisible_in @method_list, min_visibility
remove_invisible_in @attributes, min_visibility
end
##
# Only called when min_visibility == :public or :private
def remove_invisible_in array, min_visibility # :nodoc:
if min_visibility == :public then
array.reject! { |e|
e.visibility != :public and not e.force_documentation
}
else
array.reject! { |e|
e.visibility == :private and not e.force_documentation
}
end
end
##
# Tries to resolve unmatched aliases when a method or attribute has just
# been added.
def resolve_aliases added
# resolve any pending unmatched aliases
key = added.pretty_name
unmatched_alias_list = @unmatched_alias_lists[key]
return unless unmatched_alias_list
unmatched_alias_list.each do |unmatched_alias|
added.add_alias unmatched_alias, self
@external_aliases.delete unmatched_alias
end
@unmatched_alias_lists.delete key
end
##
# Returns RDoc::Context::Section objects referenced in this context for use
# in a table of contents.
def section_contents
used_sections = {}
each_method do |method|
next unless method.display?
used_sections[method.section] = true
end
# order found sections
sections = sort_sections.select do |section|
used_sections[section]
end
# only the default section is used
return [] if
sections.length == 1 and not sections.first.title
sections
end
##
# Sections in this context
def sections
@sections.values
end
def sections_hash # :nodoc:
@sections
end
##
# Sets the current section to a section with +title+. See also #add_section
def set_current_section title, comment
@current_section = add_section title, comment
end
##
# Given an array +methods+ of method names, set the visibility of each to
# +visibility+
def set_visibility_for(methods, visibility, singleton = false)
methods_matching methods, singleton do |m|
m.visibility = visibility
end
end
##
# Sorts sections alphabetically (default) or in TomDoc fashion (none,
# Public, Internal, Deprecated)
def sort_sections
titles = @sections.map { |title, _| title }
if titles.length > 1 and
TOMDOC_TITLES_SORT ==
(titles | TOMDOC_TITLES).sort_by { |title| title.to_s } then
@sections.values_at(*TOMDOC_TITLES).compact
else
@sections.sort_by { |title, _|
title.to_s
}.map { |_, section|
section
}
end
end
def to_s # :nodoc:
"#{self.class.name} #{self.full_name}"
end
##
# Return the TopLevel that owns us
#--
# FIXME we can be 'owned' by several TopLevel (see #record_location &
# #in_files)
def top_level
return @top_level if defined? @top_level
@top_level = self
@top_level = @top_level.parent until RDoc::TopLevel === @top_level
@top_level
end
##
# Upgrades NormalModule +mod+ in +enclosing+ to a +class_type+
def upgrade_to_class mod, class_type, enclosing
enclosing.modules_hash.delete mod.name
klass = RDoc::ClassModule.from_module class_type, mod
klass.store = @store
# if it was there, then we keep it even if done_documenting
@store.classes_hash[mod.full_name] = klass
enclosing.classes_hash[mod.name] = klass
klass
end
autoload :Section, 'rdoc/context/section'
end