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##
# Struct
#
# ISO 15.2.18
class Struct
##
# Calls the given block for each element of +self+
# and pass the respective element.
#
# ISO 15.2.18.4.4
def each(&block)
self.class.members.each{|field|
block.call(self[field])
}
self
end
##
# Calls the given block for each element of +self+
# and pass the name and value of the respective
# element.
#
# ISO 15.2.18.4.5
def each_pair(&block)
self.class.members.each{|field|
block.call(field.to_sym, self[field])
}
self
end
##
# Calls the given block for each element of +self+
# and returns an array with all elements of which
# block is not false.
#
# ISO 15.2.18.4.7
def select(&block)
ary = []
self.class.members.each{|field|
val = self[field]
ary.push(val) if block.call(val)
}
ary
end
def _inspect(recur_list)
return "#<struct #{self.class}:...>" if recur_list[self.object_id]
recur_list[self.object_id] = true
name = self.class.to_s
if name[0] == "#"
str = "#<struct "
else
str = "#<struct #{name} "
end
buf = []
self.each_pair do |k,v|
buf.push k.to_s + "=" + v._inspect(recur_list)
end
str + buf.join(", ") + ">"
end
##
# call-seq:
# struct.to_s -> string
# struct.inspect -> string
#
# Describe the contents of this struct in a string.
#
# 15.2.18.4.10(x)
#
def inspect
self._inspect({})
end
##
# 15.2.18.4.11(x)
#
alias to_s inspect
##
# call-seq:
# hsh.dig(key,...) -> object
#
# Extracts the nested value specified by the sequence of <i>key</i>
# objects by calling +dig+ at each step, returning +nil+ if any
# intermediate step is +nil+.
#
def dig(idx,*args)
n = self[idx]
if args.size > 0
n&.dig(*args)
else
n
end
end
end
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