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



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
# 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)
    @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:



173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
# File 'lib/yard/code_objects/proxy.rb', line 173

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

#namespaceObject (readonly) Also known as: parent

Returns the value of attribute namespace.



27
28
29
# File 'lib/yard/code_objects/proxy.rb', line 27

def namespace
  @namespace
end

Class Method Details

.===(other) ⇒ Object



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

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

Instance Method Details

#<=>(other) ⇒ Boolean

Returns:

  • (Boolean)


113
114
115
116
117
118
119
# File 'lib/yard/code_objects/proxy.rb', line 113

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

#===(other) ⇒ Boolean

Returns:

  • (Boolean)


108
109
110
# File 'lib/yard/code_objects/proxy.rb', line 108

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

#classClass

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



137
138
139
# File 'lib/yard/code_objects/proxy.rb', line 137

def class
  to_obj ? to_obj.class : Proxy
end

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

Returns:

  • (Boolean)


122
123
124
125
126
127
128
# File 'lib/yard/code_objects/proxy.rb', line 122

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

#hashInteger

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

Returns:

  • (Integer)

    the object’s hash value (for equality checking)



132
# File 'lib/yard/code_objects/proxy.rb', line 132

def hash; path.hash end

#inspectString

Returns a text representation of the Proxy

Returns:

  • (String)

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



86
87
88
# File 'lib/yard/code_objects/proxy.rb', line 86

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

#instance_of?(klass) ⇒ Boolean

Returns:

  • (Boolean)


156
157
158
# File 'lib/yard/code_objects/proxy.rb', line 156

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

#is_a?(klass) ⇒ Boolean

Returns:

  • (Boolean)


103
104
105
# File 'lib/yard/code_objects/proxy.rb', line 103

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

#kind_of?(klass) ⇒ Boolean

Returns:

  • (Boolean)


161
162
163
# File 'lib/yard/code_objects/proxy.rb', line 161

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.



80
81
82
# File 'lib/yard/code_objects/proxy.rb', line 80

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

#pathString 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.

Returns:

  • (String)

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



95
96
97
# File 'lib/yard/code_objects/proxy.rb', line 95

def path
  to_obj ? to_obj.path : proxy_path
end

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

Returns:

  • (Boolean)


166
167
168
# File 'lib/yard/code_objects/proxy.rb', line 166

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

Returns:

  • (Boolean)


195
# File 'lib/yard/code_objects/proxy.rb', line 195

def root?; false end

#typeSymbol

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:



146
147
148
# File 'lib/yard/code_objects/proxy.rb', line 146

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.

Parameters:

  • type (#to_sym)

    the proxy’s inferred type



153
# File 'lib/yard/code_objects/proxy.rb', line 153

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