symbols.lisp

   1 (in-package :alexandria)
   2
   3 (declaim (inline ensure-symbol))
   4 (defun ensure-symbol (name &optional (package *package*))
   5   "Returns a symbol with name designated by NAME, accessible in package
   6 designated by PACKAGE. If symbol is not already accessible in PACKAGE, it is
   7 interned there. Returns a secondary value reflecting the status of the symbol
   8 in the package, which matches the secondary return value of INTERN.
   9
  10 Example: (ENSURE-SYMBOL :CONS :CL) => CL:CONS, :EXTERNAL"
  11   (intern (string name) package))
  12
  13 (defun make-formatted-symbol (package name)
  14   (case package
  15     ((nil)
  16      (make-symbol name))
  17     ((t)
  18      (intern name))
  19     (t
  20      (intern name package))))
  21
  22 (declaim (inline format-symbol))
  23 (defun format-symbol (package control &rest arguments)
  24   "Constructs a string by applying ARGUMENTS to CONTROL as if by FORMAT, and
  25 then creates a symbol named by that string. If PACKAGE is NIL, returns an
  26 uninterned symbol, if package is T, returns a symbol interned in the current
  27 package, and otherwise returns a symbol interned in the package designated by
  28 PACKAGE."
  29   (values
  30    (make-formatted-symbol package (apply #'format nil control arguments))))
  31
  32 (defun make-keyword (name)
  33   "Interns the string designated by NAME in the KEYWORD package."
  34   (intern (string name) :keyword))
  35
  36 (defun make-gensym-list (length &optional (x "G"))
  37   "Returns a list of LENGTH gensyms, each generated with a call to
  38 GENSYM using (if provided) as the argument."
  39   (loop repeat length
  40         collect (gensym x)))