tsymbols.lisp - clic - Clic is an command line interactive client for gopher written in Common LISP
HTML git clone git://bitreich.org/clic/ git://hg6vgqziawt5s4dj.onion/clic/
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tsymbols.lisp (2497B)
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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:
11
12 (ensure-symbol :cons :cl) => cl:cons, :external
13 "
14 (intern (string name) package))
15
16 (defun maybe-intern (name package)
17 (values
18 (if package
19 (intern name (if (eq t package) *package* package))
20 (make-symbol name))))
21
22 (declaim (inline format-symbol))
23 (defun format-symbol (package control &rest arguments)
24 "Constructs a string by applying ARGUMENTS to string designator CONTROL as
25 if by FORMAT within WITH-STANDARD-IO-SYNTAX, and then creates a symbol named
26 by that string.
27
28 If PACKAGE is NIL, returns an uninterned symbol, if package is T, returns a
29 symbol interned in the current package, and otherwise returns a symbol
30 interned in the package designated by PACKAGE."
31 (maybe-intern (with-standard-io-syntax
32 (apply #'format nil (string control) arguments))
33 package))
34
35 (defun make-keyword (name)
36 "Interns the string designated by NAME in the KEYWORD package."
37 (intern (string name) :keyword))
38
39 (defun make-gensym (name)
40 "If NAME is a non-negative integer, calls GENSYM using it. Otherwise NAME
41 must be a string designator, in which case calls GENSYM using the designated
42 string as the argument."
43 (gensym (if (typep name '(integer 0))
44 name
45 (string name))))
46
47 (defun make-gensym-list (length &optional (x "G"))
48 "Returns a list of LENGTH gensyms, each generated as if with a call to MAKE-GENSYM,
49 using the second (optional, defaulting to \"G\") argument."
50 (let ((g (if (typep x '(integer 0)) x (string x))))
51 (loop repeat length
52 collect (gensym g))))
53
54 (defun symbolicate (&rest things)
55 "Concatenate together the names of some strings and symbols,
56 producing a symbol in the current package."
57 (let* ((length (reduce #'+ things
58 :key (lambda (x) (length (string x)))))
59 (name (make-array length :element-type 'character)))
60 (let ((index 0))
61 (dolist (thing things (values (intern name)))
62 (let* ((x (string thing))
63 (len (length x)))
64 (replace name x :start1 index)
65 (incf index len))))))