Module: Opal

Defined in:
opal/opal/corelib/helpers.rb

Overview

helpers: type_error, coerce_to

Class Method Summary collapse

Class Method Details

.bridge(constructor, klass) ⇒ Object 



4
5
6
 
# File 'opal/opal/corelib/helpers.rb', line 4

def self.bridge(constructor, klass)
  `Opal.bridge(constructor, klass)`
end

.class_variable_name!(name) ⇒ Object 



87
88
89
90
91
92
93
94
95
 
# File 'opal/opal/corelib/helpers.rb', line 87

def self.class_variable_name!(name)
  name = Opal.coerce_to!(name, String, :to_str)

  if `name.length < 3 || name.slice(0,2) !== '@@'`
    raise NameError.new("`#{name}' is not allowed as a class variable name", name)
  end

  name
end

.coerce_to!(object, type, method, *args) ⇒ Object 



8
9
10
11
12
13
14
15
16
 
# File 'opal/opal/corelib/helpers.rb', line 8

def self.coerce_to!(object, type, method, *args)
  coerced = `$coerce_to(object, type, method, args)`

  unless type === coerced
    raise `$type_error(object, type, method, coerced)`
  end

  coerced
end

.coerce_to?(object, type, method, *args) ⇒ Boolean

Returns:



18
19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'opal/opal/corelib/helpers.rb', line 18

def self.coerce_to?(object, type, method, *args)
  return unless object.respond_to? method

  coerced = `$coerce_to(object, type, method, args)`

  return if coerced.nil?

  unless type === coerced
    raise `$type_error(object, type, method, coerced)`
  end

  coerced
end

.compare(a, b) ⇒ Object 



40
41
42
43
44
45
46
47
48
 
# File 'opal/opal/corelib/helpers.rb', line 40

def self.compare(a, b)
  compare = a <=> b

  if `compare === nil`
    raise ArgumentError, "comparison of #{a.class} with #{b.class} failed"
  end

  compare
end

.const_name!(const_name) ⇒ Object 



107
108
109
110
111
112
113
114
115
 
# File 'opal/opal/corelib/helpers.rb', line 107

def self.const_name!(const_name)
  const_name = Opal.coerce_to!(const_name, String, :to_str)

  if const_name[0] != const_name[0].upcase
    raise NameError, "wrong constant name #{const_name}"
  end

  const_name
end

.const_name?(const_name) ⇒ Boolean

Returns:



97
98
99
100
101
102
103
104
105
 
# File 'opal/opal/corelib/helpers.rb', line 97

def self.const_name?(const_name)
  %x{
    if (typeof const_name !== 'string') {
      #{const_name = Opal.coerce_to!(const_name, String, :to_str)}
    }

    return #{const_name}[0] === #{const_name}[0].toUpperCase()
  }
end

.destructure(args) ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
 
# File 'opal/opal/corelib/helpers.rb', line 50

def self.destructure(args)
  %x{
    if (args.length == 1) {
      return args[0];
    }
    else if (args.$$is_array) {
      return args;
    }
    else {
      var args_ary = new Array(args.length);
      for(var i = 0, l = args_ary.length; i < l; i++) { args_ary[i] = args[i]; }

      return args_ary;
    }
  }
end

.instance_variable_name!(name) ⇒ Object 



77
78
79
80
81
82
83
84
85
 
# File 'opal/opal/corelib/helpers.rb', line 77

def self.instance_variable_name!(name)
  name = Opal.coerce_to!(name, String, :to_str)

  unless `/^@[a-zA-Z_][a-zA-Z0-9_]*?$/.test(name)`
    raise NameError.new("'#{name}' is not allowed as an instance variable name", name)
  end

  name
end

.pristine(owner_class, *method_names) ⇒ nil

Mark some methods as pristine in order to apply optimizations when they are still in their original form. This could probably be moved to the Opal.def() JS API, but for now it will stay manual.

Examples:


Opal.pristine Array, :allocate, :copy_instance_variables, :initialize_dup

class Array
  def dup
    %x{
      if (
        self.$allocate.$$pristine &&
        self.$copy_instance_variables.$$pristine &&
        self.$initialize_dup.$$pristine
      ) return self.slice(0);
    }

    super
  end
end

Parameters:

  • owner_class (Class) —

    the class owning the methods

  • method_names (Array<Symbol>) —

    the list of methods names to mark

Returns:

  • (nil) 


143
144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'opal/opal/corelib/helpers.rb', line 143

def self.pristine(owner_class, *method_names)
  %x{
    var method_name, method;
    for (var i = method_names.length - 1; i >= 0; i--) {
      method_name = method_names[i];
      method = owner_class.$$prototype['$'+method_name];

      if (method && !method.$$stub) {
        method.$$pristine = true;
      }
    }
  }
  nil
end

.respond_to?(obj, method, include_all = false) ⇒ Boolean

Returns:



67
68
69
70
71
72
73
74
75
 
# File 'opal/opal/corelib/helpers.rb', line 67

def self.respond_to?(obj, method, include_all = false)
  %x{
    if (obj == null || !obj.$$class) {
      return false;
    }
  }

  obj.respond_to?(method, include_all)
end

.try_convert(object, type, method) ⇒ Object 



32
33
34
35
36
37
38
 
# File 'opal/opal/corelib/helpers.rb', line 32

def self.try_convert(object, type, method)
  return object if type === object

  if object.respond_to? method
    object.__send__ method
  end
end