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====== Macro FORMATTER ====== ====Syntax==== * **formatter** //control-string// → //function// ====Arguments and Values==== * //control-string// - a //[[CL:Glossary:format string]]//; not evaluated. * //function// - a //[[CL:Glossary:function]]//. ====Description==== Returns a //[[CL:Glossary:function]]// which has behavior equivalent to: <blockquote> #'([[CL:Symbols:lambda]] ([[CL:Variables:star-standard-output-star|*standard-output*]] &rest arguments) ([[CL:Functions:apply]] #'[[CL:Functions:format]] [[CL:Constant Variables:t]] //control-string// arguments) //arguments-tail//) </blockquote> where //arguments-tail// is either the tail of //arguments// which has as its //[[CL:Glossary:car]]// the argument that would be processed next if there were more format directives in the //control-string//, or else **[[CL:Constant Variables:nil]]** if no more //arguments// follow the most recently processed argument. ====Examples==== <blockquote> ([[CL:Functions:funcall]] (formatter "~&~A~A") [[CL:Variables:star-standard-output-star|*standard-output*]] 'a 'b 'c) <o>AB </o> <r>(C)</r> ([[CL:Functions:format]] [[CL:Constant Variables:t]] (formatter "~&~A~A") 'a 'b 'c) <o>AB </o> <r>[[CL:Constant Variables:NIL]] </r> </blockquote> ====Side Effects==== None. ====Affected By==== None. ====Exceptional Situations==== Might signal an error (at macro expansion time or at run time) if the argument is not a valid //[[CL:Glossary:format string]]//. ====See Also==== * **[[CL:Functions:format|Function FORMATTER]]** ====Notes==== None. \issue{PRETTY-PRINT-INTERFACE}