# File lib/rake.rb, line 73 73: def ext(newext='') 74: return self.dup if ['.', '..'].include? self 75: if newext != '' 76: newext = (newext =~ /^\./) ? newext : ("." + newext) 77: end 78: dup.sub!(%r(([^/\\])\.[^./\\]*$)) { $1 + newext } || self + newext 79: end