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:



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# 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

#begin ⇒ Object (readonly)

Returns the value of attribute begin



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

def begin
  @begin
end

#end ⇒ Object (readonly)

Returns the value of attribute end



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

def end
  @end
end

Instance Method Details

#==(other) ⇒ Object 



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# 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 



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

def ===(value)
  include? value
end

#__marshal__(buffer) ⇒ Object 



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# 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 



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# 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:



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# 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) 


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# 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:



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# 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:



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

def exclude_end?
  @excl
end

#first(n = undefined) ⇒ Object 



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

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

#hash ⇒ Object 



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

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

#inspect ⇒ Object 



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

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

#last(n = undefined) ⇒ Object 



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# 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 



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# File 'opal/opal/corelib/range.rb', line 256

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

#max ⇒ Object

FIXME: currently hardcoded to assume range holds numerics



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# 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

#min ⇒ Object 



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# 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

#size ⇒ Object 



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# 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 



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# 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_s ⇒ Object 



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

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