64 lines
2.6 KiB
Common Lisp
64 lines
2.6 KiB
Common Lisp
;;; swank-util.lisp --- stuff of questionable utility
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;;
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;; License: public domain
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(in-package :swank)
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(defmacro do-symbols* ((var &optional (package '*package*) result-form)
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&body body)
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"Just like do-symbols, but makes sure a symbol is visited only once."
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(let ((seen-ht (gensym "SEEN-HT")))
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`(let ((,seen-ht (make-hash-table :test #'eq)))
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(do-symbols (,var ,package ,result-form)
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(unless (gethash ,var ,seen-ht)
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(setf (gethash ,var ,seen-ht) t)
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(tagbody ,@body))))))
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(defun classify-symbol (symbol)
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"Returns a list of classifiers that classify SYMBOL according to its
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underneath objects (e.g. :BOUNDP if SYMBOL constitutes a special
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variable.) The list may contain the following classification
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keywords: :BOUNDP, :FBOUNDP, :CONSTANT, :GENERIC-FUNCTION,
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:TYPESPEC, :CLASS, :MACRO, :SPECIAL-OPERATOR, and/or :PACKAGE"
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(check-type symbol symbol)
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(flet ((type-specifier-p (s)
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(or (documentation s 'type)
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(not (eq (type-specifier-arglist s) :not-available)))))
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(let (result)
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(when (boundp symbol) (push (if (constantp symbol)
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:constant :boundp) result))
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(when (fboundp symbol) (push :fboundp result))
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(when (type-specifier-p symbol) (push :typespec result))
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(when (find-class symbol nil) (push :class result))
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(when (macro-function symbol) (push :macro result))
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(when (special-operator-p symbol) (push :special-operator result))
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(when (find-package symbol) (push :package result))
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(when (and (fboundp symbol)
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(typep (ignore-errors (fdefinition symbol))
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'generic-function))
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(push :generic-function result))
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result)))
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(defun symbol-classification-string (symbol)
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"Return a string in the form -f-c---- where each letter stands for
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boundp fboundp generic-function class macro special-operator package"
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(let ((letters "bfgctmsp")
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(result (copy-seq "--------")))
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(flet ((flip (letter)
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(setf (char result (position letter letters))
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letter)))
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(when (boundp symbol) (flip #\b))
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(when (fboundp symbol)
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(flip #\f)
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(when (typep (ignore-errors (fdefinition symbol))
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'generic-function)
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(flip #\g)))
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(when (type-specifier-p symbol) (flip #\t))
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(when (find-class symbol nil) (flip #\c) )
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(when (macro-function symbol) (flip #\m))
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(when (special-operator-p symbol) (flip #\s))
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(when (find-package symbol) (flip #\p))
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result)))
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(provide :swank-util)
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