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class Array
include Enumerable
# The flow control for many of these methods is
# pretty evil due to how MRI works. There is
# also a lot of duplication of code due to very
# subtle processing differences and, in some
# cases, to avoid mutual dependency. Apologies.
def self.[](*args)
ary = allocate
ary.replace args
ary
end
# Try to convert obj into an array, using to_ary method.
# Returns converted array or nil if obj cannot be converted
# for any reason. This method is to check if an argument is an array.
def self.try_convert(obj)
Rubinius::Type.try_convert obj, Array, :to_ary
end
def initialize(size_or_array=undefined, obj=undefined)
Rubinius.check_frozen
if undefined.equal?(size_or_array)
unless @total == 0
@total = @start = 0
@tuple = Rubinius::Tuple.new 8
end
return self
end
if undefined.equal?(obj)
obj = nil
ary = nil
if size_or_array.kind_of? Integer
# Do nothing, fall through to later case.
elsif size_or_array.kind_of? Array
ary = size_or_array
elsif Rubinius::Type.object_respond_to_ary?(size_or_array)
ary = Rubinius::Type.coerce_to size_or_array, Array, :to_ary
end
if ary
m = Rubinius::Mirror::Array.reflect ary
@tuple = m.tuple.dup
@start = m.start
@total = m.total
return self
end
end
size = Rubinius::Type.coerce_to_collection_length size_or_array
raise ArgumentError, "size must be positive" if size < 0
raise ArgumentError, "size must be <= #{Fixnum::MAX}" if size > Fixnum::MAX
if block_given?
@tuple = Rubinius::Tuple.new size
@total = i = 0
while i < size
@tuple.put i, yield(i)
@total = i += 1
end
else
@total = size
@tuple = Rubinius::Tuple.pattern size, obj
end
self
end
private :initialize
# Replaces contents of self with contents of other,
# adjusting size as needed.
def replace(other)
Rubinius.check_frozen
other = Rubinius::Type.coerce_to other, Array, :to_ary
m = Rubinius::Mirror::Array.reflect other
@tuple = m.tuple.dup
@total = m.total
@start = m.start
Rubinius::Type.infect(self, other)
self
end
alias_method :initialize_copy, :replace
private :initialize_copy
def [](arg1, arg2=nil)
case arg1
# This is split out from the generic case and put first because
# it is by far the most common case and we want to deal with it
# immediately, even at the expensive of duplicate code with the
# generic case below. In other words, don't refactor this unless
# you preserve the same or better performance.
when Fixnum
start_idx = arg1
# Convert negative indices
start_idx += @total if start_idx < 0
if arg2
count = Rubinius::Type.coerce_to_collection_index arg2
else
return nil if start_idx >= @total
begin
return @tuple.at(@start + start_idx)
# Tuple#at raises this if the index is negative or
# past the end. This is faster than checking explicitly
# since this is an exceptional case anyway.
rescue Rubinius::ObjectBoundsExceededError
return nil
end
end
when Range
start_idx = Rubinius::Type.coerce_to_collection_index arg1.begin
# Convert negative indices
start_idx += @total if start_idx < 0
# Check here because we must detect this boundary
# before we check the right index boundary cases
return nil if start_idx < 0 or start_idx > @total
right_idx = Rubinius::Type.coerce_to_collection_index arg1.end
right_idx += @total if right_idx < 0
right_idx -= 1 if arg1.exclude_end?
return new_range(0, 0) if right_idx < start_idx
count = right_idx - start_idx + 1
# Slower, less common generic coercion case.
else
start_idx = Rubinius::Type.coerce_to_collection_index arg1
# Convert negative indices
start_idx += @total if start_idx < 0
if arg2
count = Rubinius::Type.coerce_to_collection_index arg2
else
return nil if start_idx >= @total
begin
return @tuple.at(@start + start_idx)
# Tuple#at raises this if the index is negative or
# past the end. This is faster than checking explicitly
# since this is an exceptional case anyway.
rescue Rubinius::ObjectBoundsExceededError
return nil
end
end
end
# No need to go further
return nil if count < 0
# Check start boundaries
if start_idx >= @total
# Odd MRI boundary case
return new_range(0, 0) if start_idx == @total
return nil
end
return nil if start_idx < 0
# Check count boundaries
if start_idx + count > @total
count = @total - start_idx
end
# Construct the subrange
return new_range(@start + start_idx, count)
end
alias_method :slice, :[]
def <<(obj)
set_index(@total, obj)
self
end
alias_method :__append__, :<<
def *(multiplier)
if multiplier.respond_to? :to_str
return join(multiplier)
else
multiplier = Rubinius::Type.coerce_to_collection_index multiplier
raise ArgumentError, "Count cannot be negative" if multiplier < 0
case @total
when 0
# Edge case
out = self.class.allocate
Rubinius::Type.infect(out, self)
return out
when 1
# Easy case
tuple = Rubinius::Tuple.pattern multiplier, at(0)
out = self.class.allocate
m = Rubinius::Mirror::Array.reflect out
m.tuple = tuple
m.total = multiplier
Rubinius::Type.infect(out, self)
return out
end
new_total = multiplier * @total
new_tuple = Rubinius::Tuple.new(new_total)
out = self.class.allocate
m = Rubinius::Mirror::Array.reflect out
m.tuple = new_tuple
m.total = new_total
Rubinius::Type.infect(out, self)
offset = 0
while offset < new_total
new_tuple.copy_from @tuple, @start, @total, offset
offset += @total
end
out
end
end
def &(other)
other = Rubinius::Type.coerce_to other, Array, :to_ary
array = []
im = Rubinius::IdentityMap.from other
each { |x| array << x if im.delete x }
array
end
def |(other)
other = Rubinius::Type.coerce_to other, Array, :to_ary
im = Rubinius::IdentityMap.from self, other
im.to_array
end
def +(other)
other = Rubinius::Type.coerce_to other, Array, :to_ary
Array.new(self).concat(other)
end
def -(other)
other = Rubinius::Type.coerce_to other, Array, :to_ary
array = []
im = Rubinius::IdentityMap.from other
each { |x| array << x unless im.include? x }
array
end
def <=>(other)
other = Rubinius::Type.check_convert_type other, Array, :to_ary
return 0 if equal? other
return nil if other.nil?
total = Rubinius::Mirror::Array.reflect(other).total
Thread.detect_recursion self, other do
i = 0
count = total < @total ? total : @total
while i < count
order = self[i] <=> other[i]
return order unless order == 0
i += 1
end
end
# subtle: if we are recursing on that pair, then let's
# no go any further down into that pair;
# any difference will be found elsewhere if need be
@total <=> total
end
def ==(other)
return true if equal?(other)
unless other.kind_of? Array
return false unless other.respond_to? :to_ary
return other == self
end
return false unless size == other.size
Thread.detect_recursion self, other do
m = Rubinius::Mirror::Array.reflect other
md = @tuple
od = m.tuple
i = @start
j = m.start
total = i + @total
while i < total
return false unless md[i] == od[j]
i += 1
j += 1
end
end
true
end
def assoc(obj)
each do |x|
if x.kind_of? Array and x.first == obj
return x
end
end
nil
end
def bsearch
return to_enum :bsearch unless block_given?
m = Rubinius::Mirror::Array.reflect self
tuple = m.tuple
min = start = m.start
max = total = start + m.total
last_true = nil
i = start + m.total / 2
while max >= min and i >= start and i < total
x = yield tuple.at(i)
return tuple.at(i) if x == 0
case x
when Numeric
if x > 0
min = i + 1
else
max = i - 1
end
when true
last_true = i
max = i - 1
when false, nil
min = i + 1
else
raise TypeError, "Array#bsearch block must return Numeric or boolean"
end
i = min + (max - min) / 2
end
return tuple.at(i) if max > min
return tuple.at(last_true) if last_true
nil
end
def clear
Rubinius.check_frozen
@tuple = Rubinius::Tuple.new(1)
@total = 0
@start = 0
self
end
def combination(num)
num = Rubinius::Type.coerce_to_collection_index num
unless block_given?
return to_enum(:combination, num) do
Rubinius::Mirror::Array.reflect(self).combination_size(num)
end
end
if num == 0
yield []
elsif num == 1
each do |i|
yield [i]
end
elsif num == size
yield self.dup
elsif num >= 0 && num < size
stack = Rubinius::Tuple.pattern num + 1, 0
chosen = Rubinius::Tuple.new num
lev = 0
done = false
stack[0] = -1
until done
chosen[lev] = self.at(stack[lev+1])
while lev < num - 1
lev += 1
chosen[lev] = self.at(stack[lev+1] = stack[lev] + 1)
end
yield chosen.to_a
lev += 1
begin
done = lev == 0
stack[lev] += 1
lev -= 1
end while stack[lev+1] + num == size + lev + 1
end
end
self
end
def compact
out = dup
out.untaint if out.tainted?
out.trust if out.untrusted?
Array.new(out.compact! || out)
end
def compact!
Rubinius.check_frozen
if (deleted = @tuple.delete(@start, @total, nil)) > 0
@total -= deleted
reallocate_shrink()
return self
else
return nil
end
end
def concat(other)
Rubinius.primitive :array_concat
other = Rubinius::Type.coerce_to(other, Array, :to_ary)
Rubinius.check_frozen
return self if other.empty?
concat other
end
def count(item = undefined)
seq = 0
if !undefined.equal?(item)
each { |o| seq += 1 if item == o }
elsif block_given?
each { |o| seq += 1 if yield(o) }
else
return @total
end
seq
end
def cycle(n=nil)
unless block_given?
return to_enum(:cycle, n) do
Rubinius::EnumerableHelper.cycle_size(size, n)
end
end
return nil if empty?
# Don't use nil? because, historically, lame code has overridden that method
if n.equal? nil
while true
each { |x| yield x }
end
else
n = Rubinius::Type.coerce_to_collection_index n
n.times do
each { |x| yield x }
end
end
nil
end
def delete(obj)
key = undefined
i = @start
total = i + @total
tuple = @tuple
while i < total
element = tuple.at i
if element == obj
# We MUST check frozen here, not at the top, because MRI
# requires that #delete not raise unless an element would
# be deleted.
Rubinius.check_frozen
tuple.put i, key
last_matched_element = element
end
i += 1
end
deleted = @tuple.delete @start, @total, key
if deleted > 0
@total -= deleted
reallocate_shrink()
return last_matched_element
end
if block_given?
yield
else
nil
end
end
def delete_at(idx)
Rubinius.check_frozen
idx = Rubinius::Type.coerce_to_collection_index idx
# Flip to positive and weed out out of bounds
idx += @total if idx < 0
return nil if idx < 0 or idx >= @total
# Grab the object and adjust the indices for the rest
obj = @tuple.at(@start + idx)
# Shift style.
if idx == 0
@tuple.put @start, nil
@start += 1
else
@tuple.copy_from(@tuple, @start+idx+1, @total-idx-1, @start+idx)
@tuple.put(@start + @total - 1, nil)
end
@total -= 1
obj
end
def delete_if
return to_enum(:delete_if) { size } unless block_given?
Rubinius.check_frozen
return self if empty?
i = pos = @start
total = i + @total
tuple = @tuple
while i < total
x = tuple.at i
unless yield x
# Ok, keep the value, so stick it back into the array at
# the insert position
tuple.put pos, x
pos += 1
end
i += 1
end
@total = pos - @start
self
end
def each_index
return to_enum(:each_index) { size } unless block_given?
i = 0
total = @total
while i < total
yield i
i += 1
end
self
end
# WARNING: This method does no boundary checking. It is expected that
# the caller handle that, eg #slice!
def delete_range(index, del_length)
# optimize for fast removal..
reg_start = index + del_length
reg_length = @total - reg_start
if reg_start <= @total
# If we're removing from the front, also reset @start to better
# use the Tuple
if index == 0
# Use a shift start optimization if we're only removing one
# element and the shift started isn't already huge.
if del_length == 1
@tuple.put @start, nil
@start += 1
else
@tuple.copy_from @tuple, reg_start + @start, reg_length, 0
@start = 0
end
else
@tuple.copy_from @tuple, reg_start + @start, reg_length,
@start + index
end
# TODO we leave the old references in the Tuple, we should
# probably clear them out though.
@total -= del_length
end
end
private :delete_range
def eql?(other)
return true if equal? other
return false unless other.kind_of?(Array)
return false if @total != other.size
Thread.detect_recursion self, other do
i = 0
each do |x|
return false unless x.eql? other[i]
i += 1
end
end
true
end
def empty?
@total == 0
end
def fetch(idx, default=undefined)
orig = idx
idx = Rubinius::Type.coerce_to_collection_index idx
idx += @total if idx < 0
if idx < 0 or idx >= @total
if block_given?
return yield(orig)
end
return default unless undefined.equal?(default)
raise IndexError, "index #{idx} out of bounds"
end
at(idx)
end
def fill(a=undefined, b=undefined, c=undefined)
Rubinius.check_frozen
if block_given?
unless undefined.equal?(c)
raise ArgumentError, "wrong number of arguments"
end
one = a
two = b
else
if undefined.equal?(a)
raise ArgumentError, "wrong number of arguments"
end
obj = a
one = b
two = c
end
if one.kind_of? Range
raise TypeError, "length invalid with range" unless undefined.equal?(two)
left = Rubinius::Type.coerce_to_collection_length one.begin
left += size if left < 0
raise RangeError, "#{one.inspect} out of range" if left < 0
right = Rubinius::Type.coerce_to_collection_length one.end
right += size if right < 0
right += 1 unless one.exclude_end?
return self if right <= left # Nothing to modify
elsif one and !undefined.equal?(one)
left = Rubinius::Type.coerce_to_collection_length one
left += size if left < 0
left = 0 if left < 0
if two and !undefined.equal?(two)
begin
right = Rubinius::Type.coerce_to_collection_length two
rescue TypeError
raise ArgumentError, "second argument must be a Fixnum"
end
return self if right == 0
right += left
else
right = size
end
else
left = 0
right = size
end
total = @start + right
if right > @total
reallocate total
@total = right
end
# Must be after the potential call to reallocate, since
# reallocate might change @tuple
tuple = @tuple
i = @start + left
if block_given?
while i < total
tuple.put i, yield(i-@start)
i += 1
end
else
while i < total
tuple.put i, obj
i += 1
end
end
self
end
def first(n = undefined)
return at(0) if undefined.equal?(n)
n = Rubinius::Type.coerce_to_collection_index n
raise ArgumentError, "Size must be positive" if n < 0
Array.new self[0, n]
end
def flatten(level=-1)
level = Rubinius::Type.coerce_to_collection_index level
return self.dup if level == 0
out = new_reserved size
recursively_flatten(self, out, level)
Rubinius::Type.infect(out, self)
out
end
def flatten!(level=-1)
Rubinius.check_frozen
level = Rubinius::Type.coerce_to_collection_index level
return nil if level == 0
out = new_reserved size
if recursively_flatten(self, out, level)
replace(out)
return self
end
nil
end
def hash
hash_val = size
mask = Fixnum::MAX >> 1
# This is duplicated and manually inlined code from Thread for performance
# reasons. Before refactoring it, please benchmark it and compare your
# refactoring against the original.
id = object_id
objects = Thread.current.recursive_objects
# If there is already an our version running...
if objects.key? :__detect_outermost_recursion__
# If we've seen self, unwind back to the outer version
if objects.key? id
raise Thread::InnerRecursionDetected
end
# .. or compute the hash value like normal
begin
objects[id] = true
each { |x| hash_val = ((hash_val & mask) << 1) ^ x.hash }
ensure
objects.delete id
end
return hash_val
else
# Otherwise, we're the outermost version of this code..
begin
objects[:__detect_outermost_recursion__] = true
objects[id] = true
each { |x| hash_val = ((hash_val & mask) << 1) ^ x.hash }
# An inner version will raise to return back here, indicating that
# the whole structure is recursive. In which case, abondon most of
# the work and return a simple hash value.
rescue Thread::InnerRecursionDetected
return size
ensure
objects.delete :__detect_outermost_recursion__
objects.delete id
end
end
return hash_val
end
def include?(obj)
# This explicit loop is for performance only. Preferably,
# this method would be implemented as:
#
# each { |x| return true if x == obj }
#
# but the JIT will currently not inline the block into the
# method that calls #include? which causes #include? to
# execute about 3x slower. Since this is a very commonly
# used method, this manual performance optimization is used.
# Ideally, this will be removed when the JIT can handle the
# block used here.
i = @start
total = i + @total
tuple = @tuple
while i < total
return true if tuple.at(i) == obj
i += 1
end
false
end
def find_index(obj=undefined)
super
end
alias_method :index, :find_index
def insert(idx, *items)
Rubinius.check_frozen
return self if items.length == 0
# Adjust the index for correct insertion
idx = Rubinius::Type.coerce_to_collection_index idx
idx += (@total + 1) if idx < 0 # Negatives add AFTER the element
raise IndexError, "#{idx} out of bounds" if idx < 0
self[idx, 0] = items # Cheat
self
end
def inspect
return "[]".force_encoding(Encoding::US_ASCII) if @total == 0
comma = ", "
result = "["
return "[...]" if Thread.detect_recursion self do
each_with_index do |element, index|
temp = element.inspect
result.force_encoding(temp.encoding) if index == 0
result << temp << comma
end
end
Rubinius::Type.infect(result, self)
result.shorten!(2)
result << "]"
result
end
alias_method :to_s, :inspect
def join(sep=nil)
return "".force_encoding(Encoding::US_ASCII) if @total == 0
out = ""
raise ArgumentError, "recursive array join" if Thread.detect_recursion self do
sep = sep.nil? ? $, : StringValue(sep)
# We've manually unwound the first loop entry for performance
# reasons.
x = @tuple[@start]
if str = String.try_convert(x)
x = str
elsif ary = Array.try_convert(x)
x = ary.join(sep)
else
x = x.to_s
end
out.force_encoding(x.encoding)
out << x
total = @start + size()
i = @start + 1
while i < total
out << sep if sep
x = @tuple[i]
if str = String.try_convert(x)
x = str
elsif ary = Array.try_convert(x)
x = ary.join(sep)
else
x = x.to_s
end
out << x
i += 1
end
end
Rubinius::Type.infect(out, self)
end
def keep_if(&block)
return to_enum(:keep_if) { size } unless block_given?
Rubinius.check_frozen
replace select(&block)
end
def last(n=undefined)
if undefined.equal?(n)
return at(-1)
elsif size < 1
return []
end
n = Rubinius::Type.coerce_to_collection_index n
return [] if n == 0
raise ArgumentError, "count must be positive" if n < 0
n = size if n > size
Array.new self[-n..-1]
end
alias_method :collect, :map
alias_method :collect!, :map!
def nitems
sum = 0
each { |elem| sum += 1 unless elem.equal? nil }
sum
end
def pack(directives)
Rubinius.primitive :array_pack
unless directives.kind_of? String
return pack(StringValue(directives))
end
raise ArgumentError, "invalid directives string: #{directives}"
end
def permutation(num=undefined, &block)
unless block_given?
return to_enum(:permutation, num) do
Rubinius::Mirror::Array.reflect(self).permutation_size(num)
end
end
if undefined.equal? num
num = @total
else
num = Rubinius::Type.coerce_to_collection_index num
end
if num < 0 || @total < num
# no permutations, yield nothing
elsif num == 0
# exactly one permutation: the zero-length array
yield []
elsif num == 1
# this is a special, easy case
each { |val| yield [val] }
else
# this is the general case
perm = Array.new(num)
used = Array.new(@total, false)
if block
# offensive (both definitions) copy.
offensive = dup
Rubinius.privately do
offensive.__permute__(num, perm, 0, used, &block)
end
else
__permute__(num, perm, 0, used, &block)
end
end
self
end
def __permute__(num, perm, index, used, &block)
# Recursively compute permutations of r elements of the set [0..n-1].
# When we have a complete permutation of array indexes, copy the values
# at those indexes into a new array and yield that array.
#
# num: the number of elements in each permutation
# perm: the array (of size num) that we're filling in
# index: what index we're filling in now
# used: an array of booleans: whether a given index is already used
#
# Note: not as efficient as could be for big num.
@total.times do |i|
unless used[i]
perm[index] = i
if index < num-1
used[i] = true
__permute__(num, perm, index+1, used, &block)
used[i] = false
else
yield values_at(*perm)
end
end
end
end
private :__permute__
def pop(many=undefined)
Rubinius.check_frozen
if undefined.equal?(many)
return nil if @total == 0
@total -= 1
index = @start + @total
elem = @tuple.at(index)
@tuple.put index, nil
elem
else
many = Rubinius::Type.coerce_to_collection_index many
raise ArgumentError, "negative array size" if many < 0
first = @total - many
first = 0 if first < 0
out = Array.new self[first, many]
if many > @total
@total = 0
else
@total -= many
end
return out
end
end
# Implementation notes: We build a block that will generate all the
# combinations by building it up successively using "inject" and starting
# with one responsible to append the values.
def product(*args)
args.map! { |x| Rubinius::Type.coerce_to(x, Array, :to_ary) }
# Check the result size will fit in an Array.
sum = args.inject(size) { |n, x| n * x.size }
if sum > Fixnum::MAX
raise RangeError, "product result is too large"
end
# TODO rewrite this to not use a tree of Proc objects.
# to get the results in the same order as in MRI, vary the last argument first
args.reverse!
result = []
args.push self
outer_lambda = args.inject(result.method(:push)) do |trigger, values|
lambda do |partial|
values.each do |val|
trigger.call(partial.dup << val)
end
end
end
outer_lambda.call([])
if block_given?
block_result = self
result.each { |v| block_result << yield(v) }
block_result
else
result
end
end
def push(*args)
Rubinius.check_frozen
return self if args.empty?
concat args
end
def rassoc(obj)
each do |elem|
if elem.kind_of? Array and elem.at(1) == obj
return elem
end
end
nil
end
def reject(&block)
return to_enum(:reject) { size } unless block_given?
Array.new(self).delete_if(&block)
end
def reject!(&block)
return to_enum(:reject!) { size } unless block_given?
Rubinius.check_frozen
was = size()
delete_if(&block)
return nil if was == size()
self
end
def repeated_combination(combination_size, &block)
combination_size = combination_size.to_i
unless block_given?
return to_enum(:repeated_combination, combination_size) do
Rubinius::Mirror::Array.reflect(self).repeated_combination_size(combination_size)
end
end
if combination_size < 0
# yield nothing
else
Rubinius.privately do
dup.compile_repeated_combinations(combination_size, [], 0, combination_size, &block)
end
end
return self
end
def compile_repeated_combinations(combination_size, place, index, depth, &block)
if depth > 0
(length - index).times do |i|
place[combination_size-depth] = index + i
compile_repeated_combinations(combination_size,place,index + i,depth-1, &block)
end
else
yield place.map { |element| self[element] }
end
end
private :compile_repeated_combinations
def repeated_permutation(combination_size, &block)
combination_size = combination_size.to_i
unless block_given?
return to_enum(:repeated_permutation, combination_size) do
Rubinius::Mirror::Array.reflect(self).repeated_permutation_size(combination_size)
end
end
if combination_size < 0
# yield nothing
elsif combination_size == 0
yield []
else
Rubinius.privately do
dup.compile_repeated_permutations(combination_size, [], 0, &block)
end
end
return self
end
def compile_repeated_permutations(combination_size, place, index, &block)
length.times do |i|
place[index] = i
if index < (combination_size-1)
compile_repeated_permutations(combination_size, place, index + 1, &block)
else
yield place.map { |element| self[element] }
end
end
end
private :compile_repeated_permutations
def reverse
Array.new dup.reverse!
end
def reverse!
Rubinius.check_frozen
return self unless @total > 1
@tuple.reverse! @start, @total
return self
end
def reverse_each
return to_enum(:reverse_each) { size } unless block_given?
stop = @start - 1
i = stop + @total
tuple = @tuple
while i > stop
yield tuple.at(i)
i -= 1
end
self
end
def rindex(obj=undefined)
if undefined.equal?(obj)
return to_enum(:rindex, obj) unless block_given?
i = @total - 1
while i >= 0
return i if yield @tuple.at(@start + i)
# Compensate for the array being modified by the block
i = @total if i > @total
i -= 1
end
else
stop = @start - 1
i = stop + @total
tuple = @tuple
while i > stop
return i - @start if tuple.at(i) == obj
i -= 1
end
end
nil
end
def rotate(n=1)
n = Rubinius::Type.coerce_to_collection_index n
return Array.new(self) if length == 1
return [] if empty?
ary = Array.new(self)
idx = n % ary.size
ary[idx..-1].concat ary[0...idx]
end
def rotate!(cnt=1)
Rubinius.check_frozen
return self if length == 0 || length == 1
ary = rotate(cnt)
replace ary
end
class SampleRandom
def initialize(rng)
@rng = rng
end
def rand(size)
random = Rubinius::Type.coerce_to_collection_index @rng.rand(size)
raise RangeError, "random value must be >= 0" if random < 0
raise RangeError, "random value must be less than Array size" unless random < size
random
end
end
def sample(count=undefined, options=undefined)
return at Kernel.rand(size) if undefined.equal? count
if undefined.equal? options
if o = Rubinius::Type.check_convert_type(count, Hash, :to_hash)
options = o
count = nil
else
options = nil
count = Rubinius::Type.coerce_to_collection_index count
end
else
count = Rubinius::Type.coerce_to_collection_index count
options = Rubinius::Type.coerce_to options, Hash, :to_hash
end
if count and count < 0
raise ArgumentError, "count must be greater than 0"
end
rng = options[:random] if options
if rng and rng.respond_to? :rand
rng = SampleRandom.new rng
else
rng = Kernel
end
return at rng.rand(size) unless count
count = size if count > size
case count
when 0
return []
when 1
return [at(rng.rand(size))]
when 2
i = rng.rand(size)
j = rng.rand(size)
if i == j
j = i == 0 ? i + 1 : i - 1
end
return [at(i), at(j)]
else
if size / count > 3
abandon = false
spin = 0
result = Array.new count
i = 1
result[0] = rng.rand(size)
while i < count
k = rng.rand(size)
j = 0
while j < i
while k == result[j]
spin += 1
if spin > 100
abandon = true
break
end
k = rng.rand(size)
end
break if abandon
j += 1
end
break if abandon
result[i] = k
i += 1
end
unless abandon
i = 0
while i < count
result[i] = at result[i]
i += 1
end
return result
end
end
result = Array.new self
tuple = Rubinius::Mirror::Array.reflect(result).tuple
count.times { |i| tuple.swap i, rng.rand(size) }
return count == size ? result : result[0, count]
end
end
def select!(&block)
return to_enum(:select!) { size } unless block_given?
Rubinius.check_frozen
ary = select(&block)
replace ary unless size == ary.size
end
def set_index(index, ent, fin=undefined)
Rubinius.primitive :array_aset
Rubinius.check_frozen
ins_length = nil
unless undefined.equal? fin
ins_length = Rubinius::Type.coerce_to_collection_index ent
ent = fin # 2nd arg (ins_length) is the optional one!
end
# Normalise Ranges
if index.kind_of? Range
if ins_length
raise ArgumentError, "Second argument invalid with a range"
end
last = Rubinius::Type.coerce_to_collection_index index.last
last += @total if last < 0
last += 1 unless index.exclude_end?
index = Rubinius::Type.coerce_to_collection_index index.first
if index < 0
index += @total
raise RangeError, "Range begin #{index-@total} out of bounds" if index < 0
end
# m..n, m > n allowed
last = index if index > last
ins_length = last - index
else
index = Rubinius::Type.coerce_to_collection_index index
if index < 0
index += @total
raise IndexError,"Index #{index-@total} out of bounds" if index < 0
end
end
if ins_length
# ins_length < 0 not allowed
raise IndexError, "Negative length #{ins_length}" if ins_length < 0
# MRI seems to be forgiving here!
space = @total - index
if ins_length > space
ins_length = space > 0 ? space : 0
end
replace_count = 0
if ent.kind_of? Array
replacement = ent
replace_count = replacement.size
replacement = replacement.first if replace_count == 1
elsif ent.respond_to? :to_ary
replacement = ent.to_ary
replace_count = replacement.size
replacement = replacement.first if replace_count == 1
else
replacement = ent
replace_count = 1
end
new_total = (index > @total) ? index : @total
if replace_count > ins_length
new_total += replace_count - ins_length
elsif replace_count < ins_length
new_total -= ins_length - replace_count
end
if new_total > @tuple.size - @start
# Expand the size just like #<< does.
# MRI uses a straight realloc here to the exact size, but
# realloc can easily include bumper data so it's pretty fast.
# We simply compensate by using the same logic to reduce
# having to copy data.
new_tuple = Rubinius::Tuple.new(new_total + @tuple.size / 2)
new_tuple.copy_from(@tuple, @start, index < @total ? index : @total, 0)
case replace_count
when 1
new_tuple[index] = replacement
when 0
# nothing
else
m = Rubinius::Mirror::Array.reflect replacement
new_tuple.copy_from m.tuple, m.start, replace_count, index
end
if index < @total
new_tuple.copy_from(@tuple, @start + index + ins_length,
@total - index - ins_length,
index + replace_count)
end
@start = 0
@tuple = new_tuple
@total = new_total
else
# Move the elements to the right
if index < @total
right_start = @start + index + ins_length
right_len = @total - index - ins_length
@tuple.copy_from(@tuple, right_start, right_len,
@start + index + replace_count)
end
case replace_count
when 1
@tuple[@start + index] = replacement
when 0
# nothing
else
m = Rubinius::Mirror::Array.reflect replacement
@tuple.copy_from m.tuple, m.start, replace_count, @start + index
end
@total = new_total
end
return ent
else
nt = @start + index + 1
reallocate(nt) if @tuple.size < nt
@tuple.put @start + index, ent
if index >= @total - 1
@total = index + 1
end
return ent
end
end
alias_method :[]=, :set_index
private :set_index
# Some code depends on Array having it's own #select method,
# not just using the Enumerable one. This alias achieves that.
alias_method :select, :find_all
def shift(n=undefined)
Rubinius.check_frozen
if undefined.equal?(n)
return nil if @total == 0
obj = @tuple.at @start
@tuple.put @start, nil
@start += 1
@total -= 1
obj
else
n = Rubinius::Type.coerce_to_collection_index n
raise ArgumentError, "negative array size" if n < 0
Array.new slice!(0, n)
end
end
def shuffle(options = undefined)
return dup.shuffle!(options) if instance_of? Array
Array.new(self).shuffle!(options)
end
def shuffle!(options = undefined)
Rubinius.check_frozen
random_generator = Kernel
unless undefined.equal? options
options = Rubinius::Type.coerce_to options, Hash, :to_hash
random_generator = options[:random] if options[:random].respond_to?(:rand)
end
size.times do |i|
r = i + random_generator.rand(size - i).to_int
raise RangeError, "random number too big #{r - i}" if r < 0 || r >= size
@tuple.swap(@start + i, @start + r)
end
self
end
def slice!(start, length=undefined)
Rubinius.check_frozen
if undefined.equal? length
if start.kind_of? Range
range = start
out = self[range]
range_start = Rubinius::Type.coerce_to_collection_index range.begin
if range_start < 0
range_start = range_start + @total
end
range_end = Rubinius::Type.coerce_to_collection_index range.end
if range_end < 0
range_end = range_end + @total
elsif range_end >= @total
range_end = @total - 1
range_end += 1 if range.exclude_end?
end
range_length = range_end - range_start
range_length += 1 unless range.exclude_end?
range_end -= 1 if range.exclude_end?
if range_start < @total && range_start >= 0 && range_end < @total && range_end >= 0 && range_length > 0
delete_range(range_start, range_length)
end
else
# make sure that negative values are not passed through to the
# []= assignment
start = Rubinius::Type.coerce_to_collection_index start
start = start + @total if start < 0
# This is to match the MRI behaviour of not extending the array
# with nil when specifying an index greater than the length
# of the array.
return out unless start >= 0 and start < @total
out = @tuple.at start + @start
# Check for shift style.
if start == 0
@tuple.put @start, nil
@total -= 1
@start += 1
else
delete_range(start, 1)
end
end
else
start = Rubinius::Type.coerce_to_collection_index start
length = Rubinius::Type.coerce_to_collection_length length
return nil if length < 0
out = self[start, length]
if start < 0
start = @total + start
end
if start + length > @total
length = @total - start
end
if start < @total && start >= 0
delete_range(start, length)
end
end
out
end
def drop(n)
n = Rubinius::Type.coerce_to_collection_index n
raise ArgumentError, "attempt to drop negative size" if n < 0
return [] if @total == 0
new_size = @total - n
return [] if new_size <= 0
new_range @start + n, new_size
end
def sort(&block)
Array.new dup.sort_inplace(&block)
end
def sort_by!(&block)
Rubinius.check_frozen
return to_enum(:sort_by!) { size } unless block_given?
replace sort_by(&block)
end
# Sorts this Array in-place. See #sort.
#
# The threshold for choosing between Insertion sort and Mergesort
# is 13, as determined by a bit of quick tests.
#
# For results and methodology, see the commit message.
def sort_inplace(&block)
Rubinius.check_frozen
return self unless @total > 1
if (@total - @start) < 13
if block
isort_block! @start, (@start + @total), block
else
isort! @start, (@start + @total)
end
else
if block
mergesort_block! block
else
mergesort!
end
end
self
end
protected :sort_inplace
# Make a public alias. Only use sort_inplace internally to avoid
# subclass overrides.
# Alias used to avoid subclass overrides
alias_method :sort!, :sort_inplace
public :sort!
def to_a
if self.instance_of? Array
self
else
Array.new(self)
end
end
def to_ary
self
end
def to_h
super
end
def transpose
return [] if empty?
out = []
max = nil
each do |ary|
ary = Rubinius::Type.coerce_to ary, Array, :to_ary
max ||= ary.size
# Catches too-large as well as too-small (for which #fetch would suffice)
raise IndexError, "All arrays must be same length" if ary.size != max
ary.size.times do |i|
entry = (out[i] ||= [])
entry << ary.at(i)
end
end
out
end
def uniq(&block)
dup.uniq!(&block) or dup
end
def uniq!(&block)
Rubinius.check_frozen
if block_given?
im = Rubinius::IdentityMap.from(self, &block)
else
im = Rubinius::IdentityMap.from(self)
end
return if im.size == size
m = Rubinius::Mirror::Array.reflect im.to_array
@tuple = m.tuple
@start = m.start
@total = m.total
self
end
def unshift(*values)
Rubinius.check_frozen
return self if values.empty?
m = Rubinius::Mirror::Array.reflect values
if @start > values.size
# fit the new values in between 0 and @start if possible
@start -= values.size
@tuple.copy_from(m.tuple, 0, values.size, @start)
else
new_tuple = Rubinius::Tuple.new @total + values.size
new_tuple.copy_from m.tuple, 0, values.size, 0
new_tuple.copy_from @tuple, @start, @total, values.size
@start = 0
@tuple = new_tuple
end
@total += values.size
self
end
def values_at(*args)
out = []
args.each do |elem|
# Cannot use #[] because of subtly different errors
if elem.kind_of? Range
finish = Rubinius::Type.coerce_to_collection_index elem.last
start = Rubinius::Type.coerce_to_collection_index elem.first
start += @total if start < 0
next if start < 0
finish += @total if finish < 0
finish -= 1 if elem.exclude_end?
next if finish < start
start.upto(finish) { |i| out << at(i) }
else
i = Rubinius::Type.coerce_to_collection_index elem
out << at(i)
end
end
out
end
def zip(*others)
out = Array.new(size) { [] }
others = others.map do |other|
if other.respond_to?(:to_ary)
other.to_ary
else
other.to_enum :each
end
end
size.times do |i|
slot = out.at(i)
slot << @tuple.at(@start + i)
others.each do |other|
slot << case other
when Array
other.at i
else
begin
other.next
rescue StopIteration
nil
end
end
end
end
if block_given?
out.each { |ary| yield ary }
return nil
end
out
end
# Reallocates the internal Tuple to accommodate at least given size
def reallocate(at_least)
return if at_least < @tuple.size
new_total = @tuple.size * 2
if new_total < at_least
new_total = at_least
end
new_tuple = Rubinius::Tuple.new new_total
new_tuple.copy_from @tuple, @start, @total, 0
@start = 0
@tuple = new_tuple
end
private :reallocate
def reallocate_shrink
new_total = @tuple.size
return if @total > (new_total / 3)
# halve the tuple size until the total > 1/3 the size of the total
begin
new_total /= 2
end while @total < (new_total / 6)
new_tuple = Rubinius::Tuple.new(new_total)
# position values in the middle somewhere
new_start = (new_total - @total)/2
new_tuple.copy_from @tuple, @start, @total, new_start
@start = new_start
@tuple = new_tuple
end
private :reallocate_shrink
# Helper to recurse through flattening since the method
# is not allowed to recurse itself. Detects recursive structures.
def recursively_flatten(array, out, max_levels = -1)
modified = false
# Strict equality since < 0 means 'infinite'
if max_levels == 0
out.concat(array)
return false
end
max_levels -= 1
recursion = Thread.detect_recursion(array) do
m = Rubinius::Mirror::Array.reflect array
i = m.start
total = i + m.total
tuple = m.tuple
while i < total
o = tuple.at i
if Rubinius::Type.object_kind_of? o, Array
modified = true
recursively_flatten o, out, max_levels
elsif Rubinius::Type.object_respond_to? o, :to_ary
ary = o.__send__ :to_ary
if nil.equal? ary
out << o
else
modified = true
recursively_flatten ary, out, max_levels
end
elsif ary = Rubinius::Type.execute_check_convert_type(o, Array, :to_ary)
modified = true
recursively_flatten ary, out, max_levels
else
out << o
end
i += 1
end
end
raise ArgumentError, "tried to flatten recursive array" if recursion
modified
end
private :recursively_flatten
# Non-recursive sort using a temporary tuple for scratch storage.
# This is a hybrid mergesort; it's hybrid because for short runs under
# 8 elements long we use insertion sort and then merge those sorted
# runs back together.
def mergesort!
width = 7
@scratch = Rubinius::Tuple.new @tuple.size
# do a pre-loop to create a bunch of short sorted runs; isort on these
# 7-element sublists is more efficient than doing merge sort on 1-element
# sublists
left = @start
finish = @total + @start
while left < finish
right = left + width
right = right < finish ? right : finish
last = left + (2 * width)
last = last < finish ? last : finish
isort!(left, right)
isort!(right, last)
left += 2 * width
end
# now just merge together those sorted lists from the prior loop
width = 7
while width < @total
left = @start
while left < finish
right = left + width
right = right < finish ? right : finish
last = left + (2 * width)
last = last < finish ? last : finish
bottom_up_merge(left, right, last)
left += 2 * width
end
@tuple, @scratch = @scratch, @tuple
width *= 2
end
@scratch = nil
self
end
private :mergesort!
def bottom_up_merge(left, right, last)
left_index = left
right_index = right
i = left
while i < last
if left_index < right && (right_index >= last || (@tuple.at(left_index) <=> @tuple.at(right_index)) <= 0)
@scratch[i] = @tuple.at(left_index)
left_index += 1
else
@scratch[i] = @tuple.at(right_index)
right_index += 1
end
i += 1
end
end
private :bottom_up_merge
def mergesort_block!(block)
width = 7
@scratch = Rubinius::Tuple.new @tuple.size
left = @start
finish = @total + @start
while left < finish
right = left + width
right = right < finish ? right : finish
last = left + (2 * width)
last = last < finish ? last : finish
isort_block!(left, right, block)
isort_block!(right, last, block)
left += 2 * width
end
width = 7
while width < @total
left = @start
while left < finish
right = left + width
right = right < finish ? right : finish
last = left + (2 * width)
last = last < finish ? last : finish
bottom_up_merge_block(left, right, last, block)
left += 2 * width
end
@tuple, @scratch = @scratch, @tuple
width *= 2
end
@scratch = nil
self
end
private :mergesort_block!
def bottom_up_merge_block(left, right, last, block)
left_index = left
right_index = right
i = left
while i < last
if left_index < right && (right_index >= last || block.call(@tuple.at(left_index), @tuple.at(right_index)) <= 0)
@scratch[i] = @tuple.at(left_index)
left_index += 1
else
@scratch[i] = @tuple.at(right_index)
right_index += 1
end
i += 1
end
end
private :bottom_up_merge_block
# Insertion sort in-place between the given indexes.
def isort!(left, right)
i = left + 1
tup = @tuple
while i < right
j = i
while j > left
jp = j - 1
el1 = tup.at(jp)
el2 = tup.at(j)
unless cmp = (el1 <=> el2)
raise ArgumentError, "comparison of #{el1.inspect} with #{el2.inspect} failed (#{j})"
end
break unless cmp > 0
tup.put(j, el1)
tup.put(jp, el2)
j = jp
end
i += 1
end
end
private :isort!
# Insertion sort in-place between the given indexes using a block.
def isort_block!(left, right, block)
i = left + 1
while i < right
j = i
while j > left
block_result = block.call(@tuple.at(j - 1), @tuple.at(j))
if block_result.nil?
raise ArgumentError, 'block returned nil'
elsif block_result > 0
@tuple.swap(j, (j - 1))
j -= 1
else
break
end
end
i += 1
end
end
private :isort_block!
# Move to compiler runtime
def __rescue_match__(exception)
each { |x| return true if x === exception }
false
end
end
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