96 lines
2.4 KiB
Common Lisp
96 lines
2.4 KiB
Common Lisp
;;;; kutils.lisp
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(in-package #:kutils)
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;;; "kutils" goes here. Hacks and glory await!
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;;; This file contains various utilities I've written.
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(defun join (x sep)
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(flatten
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(mapcar (lambda (y)
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(list y sep))
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x)))
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;;; hash-table functions.
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(defun |#{-reader| (stream sub-char numarg)
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(declare (ignore sub-char numarg))
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(let ((m (make-hash-table :test 'equal))
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(k nil)
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(v nil)
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(key-p t))
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(labels ((finalise-read (x)
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(reverse (concatenate 'string x)))
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(finalise-kv-pair ()
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(if key-p
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(unless (null k)
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(setq key-p nil
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k (read-from-string (finalise-read k))))
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(unless (null v)
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(setq key-p t
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v (read-from-string (finalise-read v)))
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(setf (gethash k m) v)
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(setq k nil v nil))))
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(reading-complete-p ()
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(and (null v)
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(not
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(null k)))))
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(do ((prev (read-char stream) curr)
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(curr (read-char stream) (read-char stream)))
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((and (char= prev #\}) (char= curr #\#)))
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(if (char= prev #\Space)
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(finalise-kv-pair)
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(if key-p
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(push prev k)
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(push prev v))))
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(if (reading-complete-p)
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(error "Mismatched key value pairs.")
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(progn
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(finalise-kv-pair)
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m)))))
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(defun enable-hash-table-reader ()
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"Enables the reader macro #{}# for hash-tables. The resulting
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hash-table will use #'equal for equality. For example,
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#{:a :b :c :d}#
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will create a hash-table with the keys :a and :c. :a stores the
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value :b, and :c stores the value :d.
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"
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(set-dispatch-macro-character
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#\# #\{ #'|#{-reader|))
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(defun sethash (k v m)
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"Convenience notation for setting a value in a hash table."
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(setf (gethash k m) v))
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(defun hashkeys (m)
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"Returns a list of the keys in the hash table."
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(let ((keys '()))
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(maphash (lambda (k v)
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(declare (ignore v))
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(push k keys))
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m)
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keys))
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(defun hash-table-to-alist (m)
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"Converts the hash-table given to an alist of (key . value) pairs."
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(let ((alist '()))
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(maphash (lambda (k v)
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(let ((elt (cons k v)))
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(setf alist (cons elt alist))))
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m)
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alist))
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(defun alist-to-hash-table (alist)
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"Converts the alist to a hash-table."
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(let ((m (make-hash-table :test 'equal)))
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(dolist (elt alist)
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(sethash (car elt) (cdr elt) m))
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m))
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(defun kget (elt indicator)
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