Class: YARD::Handlers::Ruby::ClassConditionHandler

Inherits:
Base
  • Object
show all
Defined in:
lib/yard/handlers/ruby/class_condition_handler.rb

Overview

Matches if/unless conditions inside classes and attempts to process only one branch (by evaluating the condition if possible).

Examples:

A simple class conditional

class Foo
  if 0
    # This method is ignored
    def xyz; end
  end
end

Constant Summary

Constants included from CodeObjects

CodeObjects::BUILTIN_ALL, CodeObjects::BUILTIN_CLASSES, CodeObjects::BUILTIN_EXCEPTIONS, CodeObjects::BUILTIN_EXCEPTIONS_HASH, CodeObjects::BUILTIN_MODULES, CodeObjects::CONSTANTMATCH, CodeObjects::CONSTANTSTART, CodeObjects::CSEP, CodeObjects::CSEPQ, CodeObjects::ISEP, CodeObjects::ISEPQ, CodeObjects::METHODMATCH, CodeObjects::METHODNAMEMATCH, CodeObjects::NAMESPACEMATCH, CodeObjects::NSEP, CodeObjects::NSEPQ

Instance Method Summary collapse

Methods included from Parser::Ruby

#s

Methods included from CodeObjects::NamespaceMapper

#clear_separators, #default_separator, on_invalidate, #register_separator, #separators, #separators_for_type, #separators_match, #types_for_separator, #unregister_separator_by_type

Constructor Details

This class inherits a constructor from YARD::Handlers::Base

Instance Method Details

#parse_condition ⇒ true, ... (protected)

Parses the condition part of the if/unless statement

Returns:

  • (true, false, nil) —

    true if the condition can be definitely parsed to true, false if not, and nil if the condition cannot be parsed with certainty (it’s dynamic)



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
78
79
80
81
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 36

def parse_condition
  condition = nil

  # Right now we can handle very simple unary conditions like:
  #   if true
  #   if false
  #   if 0
  #   if 100 (not 0)
  #   if defined? SOME_CONSTANT
  #
  # The last case will do a lookup in the registry and then one
  # in the Ruby world (using eval).
  case statement.condition.type
  when :int
    condition = statement.condition[0] != "0"
  when :defined
    # defined? keyword used, let's see if we can look up the name
    # in the registry, then we'll try using Ruby's powers. eval() is not
    # *too* dangerous here since code is not actually executed.
    arg = statement.condition.first

    if arg.type == :var_ref
      name = arg.source
      obj = YARD::Registry.resolve(namespace, name, true)

      begin
        condition = true if obj || (name && Object.instance_eval("defined? #{name}"))
      rescue SyntaxError, NameError
        condition = false
      end
    end
  when :var_ref
    var = statement.condition[0]
    if var == s(:kw, "true")
      condition = true
    elsif var == s(:kw, "false")
      condition = false
    end
  end

  # Invert an unless condition
  if statement.type == :unless || statement.type == :unless_mod
    condition = !condition unless condition.nil?
  end
  condition
end

#parse_else_block ⇒ Object (protected) 



87
88
89
90
91
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 87

def parse_else_block
  if statement.else_block
    parse_block(statement.else_block, :visibility => visibility)
  end
end

#parse_then_block ⇒ Object (protected) 



83
84
85
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 83

def parse_then_block
  parse_block(statement.then_block, :visibility => visibility)
end

#process ⇒ void

This method returns an undefined value.

Main processing callback



16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 16

process do
  condition = parse_condition
  if condition.nil?
    # Parse both blocks if we're unsure of the condition
    parse_then_block
    parse_else_block
  elsif condition
    parse_then_block
  else
    parse_else_block
  end
end