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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

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