Module: Chef::Mixin::ConvertToClassName

Extended by:
ConvertToClassName
Included in:
Deprecated, Knife, ConvertToClassName, Provider::LWRPBase, Resource, Resource, Resource::LWRPBase, ResourceResolver, Shell::ModelWrapper
Defined in:
lib/chef/mixin/convert_to_class_name.rb

Instance Method Summary collapse

Instance Method Details

#constantize(camel_cased_word) ⇒ Object

Tries to find a constant with the name specified in the argument string.

'Module'.constantize     # => Module
'Test::Unit'.constantize # => Test::Unit

The name is assumed to be the one of a top-level constant, no matter whether it starts with “::” or not. No lexical context is taken into account:

C = 'outside'
module M
  C = 'inside'
  C               # => 'inside'
  'C'.constantize # => 'outside', same as ::C
end

NameError is raised when the name is not in CamelCase or the constant is unknown.



93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
 
# File 'lib/chef/mixin/convert_to_class_name.rb', line 93

def constantize(camel_cased_word)
  names = camel_cased_word.split("::")

  # Trigger a built-in NameError exception including the ill-formed constant in the message.
  Object.const_get(camel_cased_word) if names.empty?

  # Remove the first blank element in case of '::ClassName' notation.
  names.shift if names.size > 1 && names.first.empty?

  names.inject(Object) do |constant, name|
    if constant == Object
      constant.const_get(name)
    else
      candidate = constant.const_get(name)
      next candidate if constant.const_defined?(name, false)
      next candidate unless Object.const_defined?(name)

      # Go down the ancestors to check if it is owned directly. The check
      # stops when we reach Object or the end of ancestors tree.
      constant = constant.ancestors.inject do |const, ancestor|
        break const    if ancestor == Object
        break ancestor if ancestor.const_defined?(name, false)

        const
      end

      # owner is in Object, so raise
      constant.const_get(name, false)
    end
  end
end

#convert_to_class_name(str) ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/chef/mixin/convert_to_class_name.rb', line 25

def convert_to_class_name(str)
  str = normalize_snake_case_name(str)
  rname = nil
  regexp = /^(.+?)(_(.+))?$/

  mn = str.match(regexp)
  if mn
    rname = mn[1].capitalize

    while mn && mn[3]
      mn = mn[3].match(regexp)
      rname << mn[1].capitalize if mn
    end
  end

  rname
end

#convert_to_snake_case(str, namespace = nil) ⇒ Object 



43
44
45
46
47
48
49
50
 
# File 'lib/chef/mixin/convert_to_class_name.rb', line 43

def convert_to_snake_case(str, namespace = nil)
  str = str.dup
  str.sub!(/^#{namespace}(\:\:)?/, "") if namespace
  str.gsub!(/[A-Z]/) { |s| "_" + s }
  str.downcase!
  str.sub!(/^\_/, "")
  str
end

#filename_to_qualified_string(base, filename) ⇒ Object 



64
65
66
67
68
 
# File 'lib/chef/mixin/convert_to_class_name.rb', line 64

def filename_to_qualified_string(base, filename)
  file_base = File.basename(filename, ".rb")
  str = base.to_s + (file_base == "default" ? "" : "_#{file_base}")
  normalize_snake_case_name(str)
end

#normalize_snake_case_name(str) ⇒ Object 



52
53
54
55
56
57
 
# File 'lib/chef/mixin/convert_to_class_name.rb', line 52

def normalize_snake_case_name(str)
  str = str.dup
  str.gsub!(/[^A-Za-z0-9_]/, "_")
  str.gsub!(/^(_+)?/, "")
  str
end

#snake_case_basename(str) ⇒ Object 



59
60
61
62
 
# File 'lib/chef/mixin/convert_to_class_name.rb', line 59

def snake_case_basename(str)
  with_namespace = convert_to_snake_case(str)
  with_namespace.split("::").last.sub(/^_/, "")
end