Class: Struct

Inherits:
Object show all
Includes:
Enumerable
Defined in:
opal/opal/corelib/struct.rb,
opal/opal/corelib/pattern_matching.rb,
opal/opal/corelib/marshal/write_buffer.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Enumerable

#all?, #any?, #chunk, #chunk_while, #collect, #collect_concat, #count, #cycle, #detect, #drop, #drop_while, #each_cons, #each_entry, #each_slice, #each_with_index, #each_with_object, #entries, #enumerator_size, #filter_map, #find_all, #find_index, #first, #grep, #grep_v, #group_by, #include?, #inject, #lazy, #max, #max_by, #min, #min_by, #minmax, #minmax_by, #none?, #one?, #partition, #reject, #reverse_each, #slice_after, #slice_before, #slice_when, #sort, #sort_by, #sum, #take, #take_while, #tally, #uniq, #zip

Constructor Details

#initialize(*args) ⇒ Struct

Returns a new instance of Struct.



77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
 
# File 'opal/opal/corelib/struct.rb', line 77

def initialize(*args)
  if `#{self.class}.$$keyword_init`
    kwargs = args.last || {}

    if args.length > 1 || `(args.length === 1 && !kwargs.$$is_hash)`
      raise ArgumentError, "wrong number of arguments (given #{args.length}, expected 0)"
    end

    extra = kwargs.keys - self.class.members
    if extra.any?
      raise ArgumentError, "unknown keywords: #{extra.join(', ')}"
    end

    self.class.members.each do |name|
      self[name] = kwargs[name]
    end
  else
    if args.length > self.class.members.length
      raise ArgumentError, 'struct size differs'
    end

    self.class.members.each_with_index do |name, index|
      self[name] = args[index]
    end
  end
end

Class Method Details

.define_struct_attribute(name) ⇒ Object 



45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'opal/opal/corelib/struct.rb', line 45

def self.define_struct_attribute(name)
  if self == Struct
    raise ArgumentError, 'you cannot define attributes to the Struct class'
  end

  members << name

  define_method name do
    `self.$$data[name]`
  end

  define_method "#{name}=" do |value|
    `self.$$data[name] = value`
  end
end

.inherited(klass) ⇒ Object 



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

def self.inherited(klass)
  members = @members

  klass.instance_eval do
    @members = members
  end
end

.members ⇒ Object 



61
62
63
64
65
66
67
 
# File 'opal/opal/corelib/struct.rb', line 61

def self.members
  if self == Struct
    raise ArgumentError, 'the Struct class has no members'
  end

  @members ||= []
end

.new(const_name, *args, keyword_init: false, &block) ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'opal/opal/corelib/struct.rb', line 6

def self.new(const_name, *args, keyword_init: false, &block)
  if const_name
    begin
      const_name = Opal.const_name!(const_name)
    rescue TypeError, NameError
      args.unshift(const_name)
      const_name = nil
    end
  end

  args.map do |arg|
    Opal.coerce_to!(arg, String, :to_str)
  end

  klass = Class.new(self) do
    args.each { |arg| define_struct_attribute(arg) }

    class << self
      def new(*args)
        instance = allocate
        `#{instance}.$$data = {}`
        instance.initialize(*args)
        instance
      end

      alias_method :[], :new
    end
  end

  klass.module_eval(&block) if block
  `klass.$$keyword_init = keyword_init`

  if const_name
    Struct.const_set(const_name, klass)
  end

  klass
end

Instance Method Details

#==(other) ⇒ Object 



159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
 
# File 'opal/opal/corelib/struct.rb', line 159

def ==(other)
  return false unless other.instance_of?(self.class)

  %x{
    var recursed1 = {}, recursed2 = {};

    function _eqeq(struct, other) {
      var key, a, b;

      recursed1[#{`struct`.__id__}] = true;
      recursed2[#{`other`.__id__}] = true;

      for (key in struct.$$data) {
        a = struct.$$data[key];
        b = other.$$data[key];

        if (#{Struct === `a`}) {
          if (!recursed1.hasOwnProperty(#{`a`.__id__}) || !recursed2.hasOwnProperty(#{`b`.__id__})) {
            if (!_eqeq(a, b)) {
              return false;
            }
          }
        } else {
          if (!#{`a` == `b`}) {
            return false;
          }
        }
      }

      return true;
    }

    return _eqeq(self, other);
  }
end

#[](name) ⇒ Object 



123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
 
# File 'opal/opal/corelib/struct.rb', line 123

def [](name)
  if Integer === name
    raise IndexError, "offset #{name} too small for struct(size:#{self.class.members.size})" if name < -self.class.members.size
    raise IndexError, "offset #{name} too large for struct(size:#{self.class.members.size})" if name >= self.class.members.size

    name = self.class.members[name]
  elsif String === name
    %x{
      if(!self.$$data.hasOwnProperty(name)) {
        #{raise NameError.new("no member '#{name}' in struct", name)}
      }
    }
  else
    raise TypeError, "no implicit conversion of #{name.class} into Integer"
  end

  name = Opal.coerce_to!(name, String, :to_str)
  `self.$$data[name]`
end

#[]=(name, value) ⇒ Object 



143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
 
# File 'opal/opal/corelib/struct.rb', line 143

def []=(name, value)
  if Integer === name
    raise IndexError, "offset #{name} too small for struct(size:#{self.class.members.size})" if name < -self.class.members.size
    raise IndexError, "offset #{name} too large for struct(size:#{self.class.members.size})" if name >= self.class.members.size

    name = self.class.members[name]
  elsif String === name
    raise NameError.new("no member '#{name}' in struct", name) unless self.class.members.include?(name.to_sym)
  else
    raise TypeError, "no implicit conversion of #{name.class} into Integer"
  end

  name = Opal.coerce_to!(name, String, :to_str)
  `self.$$data[name] = value`
end

#__marshal__(buffer) ⇒ Object 



166
167
168
169
170
171
172
173
174
175
176
177
178
 
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 166

def __marshal__(buffer)
  buffer.save_link(self)
  buffer.write_ivars_prefix(self)
  buffer.write_extends(self)
  buffer.append('S')
  buffer.append_symbol(self.class.name)
  buffer.write_fixnum(length)
  each_pair do |attr_name, value|
    buffer.append_symbol(attr_name)
    buffer.write(value)
  end
  buffer.write_ivars_suffix(self)
end

#deconstruct_keys(keys) ⇒ Object

This function is specified in a very weird way...

Raises:



140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'opal/opal/corelib/pattern_matching.rb', line 140

def deconstruct_keys(keys)
  return to_h if keys.nil?
  raise TypeError, 'expected Array or nil' unless Array === keys
  return {} if keys.length > values.length
  out = {}
  keys.each do |key|
    should_break = case key
                   when Integer
                     values.length < key
                   when Symbol # Or String? Doesn't matter, we're in Opal.
                     !members.include?(key)
                   end
    break if should_break
    out[key] = self[key]
  end
  out
end

#dig(key, *keys) ⇒ Object 



295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
 
# File 'opal/opal/corelib/struct.rb', line 295

def dig(key, *keys)
  item = if `key.$$is_string && self.$$data.hasOwnProperty(key)`
           `self.$$data[key] || nil`
         end

  %x{
    if (item === nil || keys.length === 0) {
      return item;
    }
  }

  unless item.respond_to?(:dig)
    raise TypeError, "#{item.class} does not have #dig method"
  end

  item.dig(*keys)
end

#each ⇒ Object 



231
232
233
234
235
236
 
# File 'opal/opal/corelib/struct.rb', line 231

def each
  return enum_for(:each) { size } unless block_given?

  self.class.members.each { |name| yield self[name] }
  self
end

#each_pair ⇒ Object 



238
239
240
241
242
243
 
# File 'opal/opal/corelib/struct.rb', line 238

def each_pair
  return enum_for(:each_pair) { size } unless block_given?

  self.class.members.each { |name| yield [name, self[name]] }
  self
end

#eql?(other) ⇒ Boolean

Returns:



195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
 
# File 'opal/opal/corelib/struct.rb', line 195

def eql?(other)
  return false unless other.instance_of?(self.class)

  %x{
    var recursed1 = {}, recursed2 = {};

    function _eqeq(struct, other) {
      var key, a, b;

      recursed1[#{`struct`.__id__}] = true;
      recursed2[#{`other`.__id__}] = true;

      for (key in struct.$$data) {
        a = struct.$$data[key];
        b = other.$$data[key];

        if (#{Struct === `a`}) {
          if (!recursed1.hasOwnProperty(#{`a`.__id__}) || !recursed2.hasOwnProperty(#{`b`.__id__})) {
            if (!_eqeq(a, b)) {
              return false;
            }
          }
        } else {
          if (!#{`a`.eql?(`b`)}) {
            return false;
          }
        }
      }

      return true;
    }

    return _eqeq(self, other);
  }
end

#hash ⇒ Object 



119
120
121
 
# File 'opal/opal/corelib/struct.rb', line 119

def hash
  Hash.new(`self.$$data`).hash
end

#initialize_copy(from) ⇒ Object 



104
105
106
107
108
109
110
111
112
113
 
# File 'opal/opal/corelib/struct.rb', line 104

def initialize_copy(from)
  %x{
    self.$$data = {}
    var keys = Object.keys(from.$$data), i, max, name;
    for (i = 0, max = keys.length; i < max; i++) {
      name = keys[i];
      self.$$data[name] = from.$$data[name];
    }
  }
end

#inspect ⇒ Object Also known as: to_s 



257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
 
# File 'opal/opal/corelib/struct.rb', line 257

def inspect
  result = '#<struct '

  if Struct === self && self.class.name
    result += "#{self.class} "
  end

  result += each_pair.map do |name, value|
    "#{name}=#{value.inspect}"
  end.join ', '

  result += '>'

  result
end

#length ⇒ Object Also known as: size 



245
246
247
 
# File 'opal/opal/corelib/struct.rb', line 245

def length
  self.class.members.length
end

#members ⇒ Object 



115
116
117
 
# File 'opal/opal/corelib/struct.rb', line 115

def members
  self.class.members
end

#to_a ⇒ Object Also known as: values, deconstruct 



251
252
253
 
# File 'opal/opal/corelib/struct.rb', line 251

def to_a
  self.class.members.map { |name| self[name] }
end

#to_h(&block) ⇒ Object 



275
276
277
278
279
 
# File 'opal/opal/corelib/struct.rb', line 275

def to_h(&block)
  return map(&block).to_h(*args) if block_given?

  self.class.members.each_with_object({}) { |name, h| h[name] = self[name] }
end

#values_at(*args) ⇒ Object 



281
282
283
284
285
286
287
288
289
290
291
292
293
 
# File 'opal/opal/corelib/struct.rb', line 281

def values_at(*args)
  args = args.map { |arg| `arg.$$is_range ? #{arg.to_a} : arg` }.flatten
  %x{
    var result = [];
    for (var i = 0, len = args.length; i < len; i++) {
      if (!args[i].$$is_number) {
        #{raise TypeError, "no implicit conversion of #{`args[i]`.class} into Integer"}
      }
      result.push(#{self[`args[i]`]});
    }
    return result;
  }
end