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) ⇒ 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 28

def initialize(namespace, name)
  namespace = Registry.root if !namespace || namespace == :root
  
  if name =~ /^#{NSEPQ}/
    namespace = Registry.root
    name = name[2..-1]
  end
  
  if name =~ /(?:#{NSEPQ}|#{ISEPQ}|#{CSEPQ})([^#{NSEPQ}#{ISEPQ}#{CSEPQ}]+)$/
    @orignamespace, @origname = namespace, name
    @imethod = true if name.include? ISEP
    namespace = Proxy.new(namespace, $`) unless $`.empty?
    name = $1
  else
    @orignamespace, @origname, @imethod = nil, nil, nil
  end 
  
  @name = name.to_sym
  @namespace = namespace
  @obj = nil
  @imethod ||= nil
  
  if @namespace.is_a?(ConstantObject)
    @origname = nil # forget these for a constant
    @orignamespace = nil
    @namespace = Proxy.new(@namespace.namespace, @namespace.value)
  end
  
  unless @namespace.is_a?(NamespaceObject) or @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 202

def method_missing(meth, *args, &block)
  if obj = to_obj
    obj.__send__(meth, *args, &block)
  else
    log.warn "Load Order / Name Resolution Problem on #{path}:"
    log.warn "-"
    log.warn "Something is trying to call #{meth} on object #{path} before it has been recognized."
    log.warn "This error usually means that you need to modify the order in which you parse files"
    log.warn "so that #{path} is parsed before methods or other objects attempt to access it."
    log.warn "-"
    log.warn "YARD will recover from this error and continue to parse but you *may* have problems"
    log.warn "with your generated documentation. You should probably fix this."
    log.warn "-"
    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 21

def namespace
  @namespace
end

Class Method Details

.===(other) ⇒ Object 



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# File 'lib/yard/code_objects/proxy.rb', line 19

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

Instance Method Details

#<=>(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 130

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

#===(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 121

def ===(other)
  if obj = to_obj
    obj === other
  else
    self.class <= other.class
  end
end

#class ⇒ Class

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

Returns:

  • (Class) —

    the resolved object’s class or Proxy



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# File 'lib/yard/code_objects/proxy.rb', line 154

def class
  if obj = to_obj
    obj.class
  else
    Proxy
  end
end

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

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 139

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

#hash ⇒ Integer

Returns the object’s hash value (for equality checking).

Returns:

  • (Integer) —

    the object’s hash value (for equality checking)



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# File 'lib/yard/code_objects/proxy.rb', line 149

def hash; path.hash end

#inspect ⇒ String

Returns a text representation of the Proxy

Returns:

  • (String) —

    the object’s #inspect method or P(OBJECTPATH)



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# File 'lib/yard/code_objects/proxy.rb', line 76

def inspect
  if obj = to_obj
    obj.inspect
  else
    "P(#{path})"
  end
end

#instance_of?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 181

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

#is_a?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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

def is_a?(klass)
  if obj = to_obj
    obj.is_a?(klass)
  else
    self.class <= klass
  end
end

#kind_of?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 186

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

#name(prefix = false) ⇒ Symbol, String

The name of the object

Parameters:

  • prefix (Boolean) (defaults to: false) —

    whether to show a prefix. Implement this in a subclass to define how the prefix is showed.

Returns:

  • (Symbol) —

    if prefix is false, the symbolized name

  • (String) —

    if prefix is true, prefix + the name as a String. This must be implemented by the subclass.



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# File 'lib/yard/code_objects/proxy.rb', line 70

def name(prefix = false)
  prefix ? (@imethod ? ISEP : '') + @name.to_s : @name
end

#path ⇒ String Also known as: to_s, to_str

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

Returns:

  • (String) —

    the assumed path of the proxy (or the real path of the resolved object)



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# File 'lib/yard/code_objects/proxy.rb', line 89

def path
  if obj = to_obj
    obj.path
  else
    if @namespace.root?
      (@imethod ? ISEP : "") + name.to_s
    elsif @origname
      if @origname =~ /^[A-Z]/
        @origname
      else
        [namespace.path, @origname].join
      end
    elsif name.to_s =~ /^[A-Z]/ # const
      name.to_s
    else # class meth?
      [namespace.path, name.to_s].join(CSEP)
    end
  end
end

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

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 191

def respond_to?(meth, include_private = false)
  if obj = to_obj
    obj.respond_to?(meth, include_private)
  else
    super
  end
end

#root? ⇒ Boolean

This class is never a root object

Returns:

  • (Boolean) 


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# File 'lib/yard/code_objects/proxy.rb', line 224

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

Returns:

  • (Symbol) —

    the Proxy’s type

See Also:



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# File 'lib/yard/code_objects/proxy.rb', line 167

def type
  if obj = to_obj
    obj.type
  else
    Registry.proxy_types[path] || :proxy
  end
end

#type=(type) ⇒ void

This method returns an undefined value.

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

Parameters:

  • type (#to_sym) —

    the proxy’s inferred type



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# File 'lib/yard/code_objects/proxy.rb', line 178

def type=(type) Registry.proxy_types[path] = type.to_sym end