Sha256: 4e0a79fbaee9f90929860361430ce68c9a3f1c2c15a333ba1bc6641a443ba7f1
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Size: 1.23 KB
Versions: 28
Compression:
Stored size: 1.23 KB
Contents
module Bmg
module Operator
class Ungroup
include Operator::Unary
def initialize(type, operand, attrs)
@type = type
@operand = operand
@attrs = attrs
end
protected
attr_reader :attrs
public
def each(&bl)
return to_enum unless block_given?
if type.knows_keys? && type.keys.any?{|k| (k & attrs).empty? }
operand.each do |tuple|
_each(tuple, attrs[0], attrs[1..-1], &bl)
end
else
with_dups = []
operand.each do |tuple|
_each(tuple, attrs[0], attrs[1..-1]){|t|
with_dups << t
}
end
with_dups.uniq.each(&bl)
end
end
def _each(tuple, attr, attrs, &bl)
rva = tuple[attr] || []
rva.each do |rvt|
t = tuple.merge(rvt).tap{|t| t.delete(attr) }
if attrs.empty?
yield(t)
else
_each(t, attrs[0], attrs[1..-1], &bl)
end
end
end
def to_ast
[ :ungroup, operand.to_ast, attrs ]
end
protected
protected ### inspect
def args
[ attrs ]
end
end # class Ungroup
end # module Operator
end # module Bmg
Version data entries
28 entries across 28 versions & 1 rubygems