Class: Range

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

Instance Attribute 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, #find_all, #find_index, #grep, #grep_v, #group_by, #inject, #lazy, #max_by, #min_by, #minmax, #minmax_by, #none?, #one?, #partition, #reject, #reverse_each, #slice_after, #slice_before, #slice_when, #sort, #sort_by, #sum, #take, #take_while, #uniq, #zip

Constructor Details

#initialize(first, last, exclude = false) ⇒ Range

Returns a new instance of Range.

Raises:



10
11
12
13
14
15
16
17
# File 'opal/opal/corelib/range.rb', line 10

def initialize(first, last, exclude = false)
  raise NameError, "'initialize' called twice" if @begin
  raise ArgumentError, 'bad value for range' unless first <=> last

  @begin = first
  @end   = last
  @excl  = exclude
end

Instance Attribute Details

#beginObject (readonly)

Returns the value of attribute begin.



8
9
10
# File 'opal/opal/corelib/range.rb', line 8

def begin
  @begin
end

#endObject (readonly)

Returns the value of attribute end.



8
9
10
# File 'opal/opal/corelib/range.rb', line 8

def end
  @end
end

Instance Method Details

#==(other) ⇒ Object



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

def ==(other)
  %x{
    if (!other.$$is_range) {
      return false;
    }

    return self.excl  === other.excl &&
           self.begin ==  other.begin &&
           self.end   ==  other.end;
  }
end

#===(value) ⇒ Object



31
32
33
# File 'opal/opal/corelib/range.rb', line 31

def ===(value)
  include? value
end

#__marshal__(buffer) ⇒ Object



150
151
152
153
154
155
156
157
158
159
160
161
162
# File 'opal/opal/corelib/marshal/write_buffer.rb', line 150

def __marshal__(buffer)
  buffer.save_link(self)
  buffer.write_extends(self)
  buffer.append('o')
  buffer.append_symbol(self.class.name)
  buffer.write_fixnum(3)
  buffer.append_symbol('excl')
  buffer.write(exclude_end?)
  buffer.append_symbol('begin')
  buffer.write(self.begin)
  buffer.append_symbol('end')
  buffer.write(self.end)
end

#bsearch(&block) ⇒ Object



238
239
240
241
242
243
244
245
246
# File 'opal/opal/corelib/range.rb', line 238

def bsearch(&block)
  return enum_for(:bsearch) unless block_given?

  unless `self.begin.$$is_number && self.end.$$is_number`
    raise TypeError, "can't do binary search for #{@begin.class}"
  end

  to_a.bsearch(&block)
end

#cover?(value) ⇒ Boolean Also known as: include?, member?

Returns:



35
36
37
38
39
40
41
42
43
44
# File 'opal/opal/corelib/range.rb', line 35

def cover?(value)
  beg_cmp = (@begin <=> value)
  return false unless beg_cmp && beg_cmp <= 0
  end_cmp = (value <=> @end)
  if @excl
    end_cmp && end_cmp < 0
  else
    end_cmp && end_cmp <= 0
  end
end

#each {|current| ... } ⇒ Object

Yields:

  • (current)


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
82
83
84
85
86
# File 'opal/opal/corelib/range.rb', line 46

def each(&block)
  return enum_for :each unless block_given?

  %x{
    var i, limit;

    if (#{@begin}.$$is_number && #{@end}.$$is_number) {
      if (#{@begin} % 1 !== 0 || #{@end} % 1 !== 0) {
        #{raise TypeError, "can't iterate from Float"}
      }

      for (i = #{@begin}, limit = #{@end} + #{@excl ? 0 : 1}; i < limit; i++) {
        block(i);
      }

      return self;
    }

    if (#{@begin}.$$is_string && #{@end}.$$is_string) {
      #{@begin.upto(@end, @excl, &block)}
      return self;
    }
  }

  current = @begin
  last    = @end

  unless current.respond_to?(:succ)
    raise TypeError, "can't iterate from #{current.class}"
  end

  while (current <=> last) < 0
    yield current

    current = current.succ
  end

  yield current if !@excl && current == last

  self
end

#eql?(other) ⇒ Boolean

Returns:



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

def eql?(other)
  return false unless Range === other

  @excl === other.exclude_end? &&
    @begin.eql?(other.begin) &&
    @end.eql?(other.end)
end

#exclude_end?Boolean

Returns:



96
97
98
# File 'opal/opal/corelib/range.rb', line 96

def exclude_end?
  @excl
end

#first(n = undefined) ⇒ Object



100
101
102
103
# File 'opal/opal/corelib/range.rb', line 100

def first(n = undefined)
  return @begin if `n == null`
  super
end

#hashObject



262
263
264
# File 'opal/opal/corelib/range.rb', line 262

def hash
  [@begin, @end, @excl].hash
end

#inspectObject



252
253
254
# File 'opal/opal/corelib/range.rb', line 252

def inspect
  "#{@begin.inspect}#{@excl ? '...' : '..'}#{@end.inspect}"
end

#last(n = undefined) ⇒ Object



107
108
109
110
# File 'opal/opal/corelib/range.rb', line 107

def last(n = undefined)
  return @end if `n == null`
  to_a.last(n)
end

#marshal_load(args) ⇒ Object



256
257
258
259
260
# File 'opal/opal/corelib/range.rb', line 256

def marshal_load(args)
  @begin = args[:begin]
  @end = args[:end]
  @excl = args[:excl]
end

#maxObject

FIXME: currently hardcoded to assume range holds numerics



113
114
115
116
117
118
119
120
121
122
123
# File 'opal/opal/corelib/range.rb', line 113

def max
  if block_given?
    super
  elsif @begin > @end
    nil
  elsif @excl && @begin == @end
    nil
  else
    `#{@excl} ? #{@end} - 1 : #{@end}`
  end
end

#minObject



127
128
129
130
131
132
133
134
135
136
137
# File 'opal/opal/corelib/range.rb', line 127

def min
  if block_given?
    super
  elsif @begin > @end
    nil
  elsif @excl && @begin == @end
    nil
  else
    @begin
  end
end

#sizeObject



139
140
141
142
143
144
145
146
147
148
149
150
# File 'opal/opal/corelib/range.rb', line 139

def size
  range_begin = @begin
  range_end   = @end
  range_end  -= 1 if @excl

  return nil unless Numeric === range_begin && Numeric === range_end
  return 0 if range_end < range_begin
  infinity = Float::INFINITY
  return infinity if [range_begin.abs, range_end.abs].include?(infinity)

  `Math.abs(range_end - range_begin) + 1`.to_i
end

#step(n = 1) ⇒ Object



152
153
154
155
156
157
158
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
194
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
230
231
232
233
234
235
236
# File 'opal/opal/corelib/range.rb', line 152

def step(n = 1)
  %x{
    function coerceStepSize() {
      if (!n.$$is_number) {
        n = #{Opal.coerce_to!(n, Integer, :to_int)}
      }

      if (n < 0) {
        #{raise ArgumentError, "step can't be negative"}
      } else if (n === 0) {
        #{raise ArgumentError, "step can't be 0"}
      }
    }

    function enumeratorSize() {
      if (!#{@begin.respond_to?(:succ)}) {
        return nil;
      }

      if (#{@begin}.$$is_string && #{@end}.$$is_string) {
        return nil;
      }

      if (n % 1 === 0) {
        return #{(size / n).ceil};
      } else {
        // n is a float
        var begin = self.begin, end = self.end,
            abs = Math.abs, floor = Math.floor,
            err = (abs(begin) + abs(end) + abs(end - begin)) / abs(n) * #{Float::EPSILON},
            size;

        if (err > 0.5) {
          err = 0.5;
        }

        if (self.excl) {
          size = floor((end - begin) / n - err);
          if (size * n + begin < end) {
            size++;
          }
        } else {
          size = floor((end - begin) / n + err) + 1
        }

        return size;
      }
    }
  }

  unless block_given?
    return enum_for(:step, n) do
      %x{
        coerceStepSize();
        return enumeratorSize();
      }
    end
  end

  `coerceStepSize()`

  if `self.begin.$$is_number && self.end.$$is_number`
    i = 0
    loop do
      current = @begin + i * n
      if @excl
        break if current >= @end
      elsif current > @end
        break
      end
      yield(current)
      i += 1
    end
  else
    %x{
      if (#{@begin}.$$is_string && #{@end}.$$is_string && n % 1 !== 0) {
        #{raise TypeError, 'no implicit conversion to float from string'}
      }
    }
    each_with_index do |value, idx|
      yield(value) if idx % n == 0
    end
  end
  self
end

#to_sObject



248
249
250
# File 'opal/opal/corelib/range.rb', line 248

def to_s
  "#{@begin}#{@excl ? '...' : '..'}#{@end}"
end