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class Symbol
include Comparable
alias intern to_sym
##
# call-seq:
# sym.capitalize -> symbol
#
# Same as <code>sym.to_s.capitalize.intern</code>.
def capitalize
(self.to_s.capitalize! || self).to_sym
end
##
# call-seq:
# sym.downcase -> symbol
#
# Same as <code>sym.to_s.downcase.intern</code>.
def downcase
(self.to_s.downcase! || self).to_sym
end
##
# call-seq:
# sym.upcase -> symbol
#
# Same as <code>sym.to_s.upcase.intern</code>.
def upcase
(self.to_s.upcase! || self).to_sym
end
##
# call-seq:
# sym.casecmp(other) -> -1, 0, +1 or nil
#
# Case-insensitive version of <code>Symbol#<=></code>.
def casecmp(other)
return nil unless other.kind_of?(Symbol)
lhs = self.to_s; lhs.upcase!
rhs = other.to_s.upcase
lhs <=> rhs
end
##
# call-seq:
# sym.casecmp?(other) -> true, false, or nil
#
# Returns true if sym and other_sym are equal after case folding,
# false if they are not equal, and nil if other_sym is not a string.
def casecmp?(sym)
c = self.casecmp(sym)
return nil if c.nil?
return c == 0
end
#
# call-seq:
# sym.empty? -> true or false
#
# Returns that _sym_ is :"" or not.
def empty?
self.length == 0
end
end
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