Class: YARD::CodeObjects::Proxy

Inherits:
Object
  • Object
show all
Defined in:
lib/yard/code_objects/proxy.rb

Overview

The Proxy class is a way to lazily resolve code objects in cases where the object may not yet exist. A proxy simply stores an unresolved path until a method is called on the object, at which point it does a lookup using Registry.resolve. If the object is not found, a warning is raised and ProxyMethodError might be raised.

Examples:

Creates a Proxy to the String class from a module

# When the String class is parsed this method will
# begin to act like the String ClassObject.
Proxy.new(mymoduleobj, "String")

See Also:

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(namespace, name, type = nil) ⇒ Proxy

Creates a new Proxy

Raises:

  • (ArgumentError) —

    if namespace is not a NamespaceObject



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# File 'lib/yard/code_objects/proxy.rb', line 34

def initialize(namespace, name, type = nil)
  namespace = Registry.root if !namespace || namespace == :root

  if name =~ /^#{NSEPQ}/
    namespace = Registry.root
    name = name[2..-1]
  end

  if name =~ PROXY_MATCH
    @orignamespace = namespace
    @origname = name
    @imethod = true if name.include? ISEP
    namespace = Proxy.new(namespace, $`) unless $`.empty?
    name = $1
  else
    @orignamespace = nil
    @origname = nil
    @imethod = nil
  end

  @name = name.to_sym
  @namespace = namespace
  @obj = nil
  @imethod ||= nil
  self.type = type

  if @namespace.is_a?(ConstantObject)
    unless @namespace.value =~ /\A#{NAMESPACEMATCH}\Z/
      raise Parser::UndocumentableError, "constant mapping"
    end

    @origname = nil # forget these for a constant
    @orignamespace = nil
    @namespace = Proxy.new(@namespace.namespace, @namespace.value)
  end

  unless @namespace.is_a?(NamespaceObject) || @namespace.is_a?(Proxy)
    raise ArgumentError, "Invalid namespace object: #{namespace}"
  end

  # If the name begins with "::" (like "::String")
  # this is definitely a root level object, so
  # remove the namespace and attach it to the root
  if @name =~ /^#{NSEPQ}/
    @name.gsub!(/^#{NSEPQ}/, '')
    @namespace = Registry.root
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args, &block) ⇒ Object

Dispatches the method to the resolved object.

Raises:



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# File 'lib/yard/code_objects/proxy.rb', line 177

def method_missing(meth, *args, &block)
  if to_obj
    to_obj.__send__(meth, *args, &block)
  else
    log.warn "Load Order / Name Resolution Problem on #{path}:\n" \
             "-\n" \
             "Something is trying to call #{meth} on object #{path} before it has been recognized.\n" \
             "This error usually means that you need to modify the order in which you parse files\n" \
             "so that #{path} is parsed before methods or other objects attempt to access it.\n" \
             "-\n" \
             "YARD will recover from this error and continue to parse but you *may* have problems\n" \
             "with your generated documentation. You should probably fix this.\n" \
             "-\n"
    begin
      super
    rescue NoMethodError
      raise ProxyMethodError, "Proxy cannot call method ##{meth} on object '#{path}'"
    end
  end
end

Instance Attribute Details

#namespace ⇒ Object (readonly) Also known as: parent

Returns the value of attribute namespace.



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# File 'lib/yard/code_objects/proxy.rb', line 27

def namespace
  @namespace
end

Class Method Details

.===(other) ⇒ Object 



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# File 'lib/yard/code_objects/proxy.rb', line 25

def self.===(other) other.is_a?(self) end

Instance Method Details

#<=>(other) ⇒ Boolean 



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# File 'lib/yard/code_objects/proxy.rb', line 117

def <=>(other)
  if other.respond_to? :path
    path <=> other.path
  else
    false
  end
end

#===(other) ⇒ Boolean 



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# File 'lib/yard/code_objects/proxy.rb', line 112

def ===(other)
  to_obj ? to_obj === other : self.class <= other.class
end

#class ⇒ Class

Returns the class name of the object the proxy is mimicking, if resolved. Otherwise returns Proxy.



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# File 'lib/yard/code_objects/proxy.rb', line 141

def class
  to_obj ? to_obj.class : Proxy
end

#equal?(other) ⇒ Boolean Also known as: == 



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# File 'lib/yard/code_objects/proxy.rb', line 126

def equal?(other)
  if other.respond_to? :path
    path == other.path
  else
    false
  end
end

#hash ⇒ Integer 



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# File 'lib/yard/code_objects/proxy.rb', line 136

def hash; path.hash end

#inspect ⇒ String

Returns a text representation of the Proxy



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# File 'lib/yard/code_objects/proxy.rb', line 90

def inspect
  to_obj ? to_obj.inspect : "P(#{path})"
end

#instance_of?(klass) ⇒ Boolean 



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# File 'lib/yard/code_objects/proxy.rb', line 160

def instance_of?(klass)
  self.class == klass
end

#is_a?(klass) ⇒ Boolean 



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# File 'lib/yard/code_objects/proxy.rb', line 107

def is_a?(klass)
  to_obj ? to_obj.is_a?(klass) : self.class <= klass
end

#kind_of?(klass) ⇒ Boolean 



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# File 'lib/yard/code_objects/proxy.rb', line 165

def kind_of?(klass)
  self.class <= klass
end

#name(prefix = false) ⇒ Symbol, String

The name of the object



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# File 'lib/yard/code_objects/proxy.rb', line 84

def name(prefix = false)
  prefix ? "#{@imethod && ISEP}#{@name}" : @name
end

#path ⇒ String Also known as: to_s, to_str, title

If the proxy resolves to an object, returns its path, otherwise guesses at the correct path using the original namespace and name.



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# File 'lib/yard/code_objects/proxy.rb', line 99

def path
  to_obj ? to_obj.path : proxy_path
end

#respond_to?(meth, include_private = false) ⇒ Boolean 



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# File 'lib/yard/code_objects/proxy.rb', line 170

def respond_to?(meth, include_private = false)
  to_obj ? to_obj.respond_to?(meth, include_private) : super
end

#root? ⇒ Boolean

This class is never a root object



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# File 'lib/yard/code_objects/proxy.rb', line 199

def root?; false end

#type ⇒ Symbol

Returns the type of the proxy. If it cannot be resolved at the time of the call, it will either return the inferred proxy type (see #type=) or :proxy

See Also:



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# File 'lib/yard/code_objects/proxy.rb', line 150

def type
  to_obj ? to_obj.type : @type || :proxy
end

#type=(type) ⇒ void

This method returns an undefined value.

Allows a parser to infer the type of the proxy by its path.



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# File 'lib/yard/code_objects/proxy.rb', line 157

def type=(type) @type = type ? type.to_sym : nil end