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::CSEP, CodeObjects::CSEPQ, CodeObjects::ISEP, CodeObjects::ISEPQ, CodeObjects::METHODMATCH, CodeObjects::METHODNAMEMATCH, CodeObjects::NAMESPACEMATCH, CodeObjects::NSEP, CodeObjects::NSEPQ

Instance Attribute Summary

Attributes inherited from Base

#extra_state, #globals, #namespace, #owner, #parser, #scope, #statement, #visibility

Instance Method Summary collapse

Methods inherited from Base

#call_params, #caller_method, handles?, meta_type, method_call, #parse_block

Methods included from Parser::Ruby

#s

Methods inherited from Base

#call_params, #caller_method, clear_subclasses, #ensure_loaded!, #expand_macro, #find_or_create_macro, handlers, handles, handles?, in_file, #initialize, matches_file?, namespace_only, namespace_only?, #parse_block, process, #push_state, #register, subclasses

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)



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
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 35

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.
    name = statement.condition[0].source
    obj = YARD::Registry.resolve(namespace, name, true)
    begin
      condition = true if obj || Object.instance_eval("defined? #{name}")
    rescue SyntaxError, NameError
      condition = false
    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 if condition != nil
  end
  condition
end

#parse_else_block ⇒ Object (protected) 



81
82
83
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 81

def parse_else_block
  parse_block(statement.else_block) if statement.else_block
end

#parse_then_block ⇒ Object (protected) 



77
78
79
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 77

def parse_then_block
  parse_block(statement.then_block)
end

#process ⇒ void

This method returns an undefined value.

Main processing callback



15
16
17
18
19
20
21
22
23
24
25
26
 
# File 'lib/yard/handlers/ruby/class_condition_handler.rb', line 15

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