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81 lines
2.8 KiB
Common Lisp
81 lines
2.8 KiB
Common Lisp
(cl:defpackage :chillax.utils
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(:use :cl :alexandria)
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(:export
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:fun :mkhash :hashget :strcat :dequote :at))
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(in-package :chillax.utils)
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;;; Functions
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(defmacro fun (&body body)
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"This macro puts the FUN back in FUNCTION."
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`(lambda (&optional _) (declare (ignorable _)) ,@body))
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;;; Hash tables
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(defun mkhash (&rest keys-and-values &aux (table (make-hash-table :test #'equal)))
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"Convenience function for `literal' hash table definition."
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(loop for (key val) on keys-and-values by #'cddr do (setf (gethash key table) val)
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finally (return table)))
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(defun hashget (hash &rest keys)
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"Convenience function for recursively accessing hash tables."
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(reduce (lambda (h k) (gethash k h)) keys :initial-value hash))
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(define-compiler-macro hashget (hash &rest keys)
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(if (null keys) hash
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(let ((hash-sym (make-symbol "HASH"))
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(key-syms (loop for i below (length keys)
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collect (make-symbol (format nil "~:@(~:R~)-KEY" i)))))
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`(let ((,hash-sym ,hash)
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,@(loop for key in keys for sym in key-syms
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collect `(,sym ,key)))
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,(reduce (lambda (hash key) `(gethash ,key ,hash))
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key-syms :initial-value hash-sym)))))
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(defun (setf hashget) (new-value hash key &rest more-keys)
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"Uses the last key given to hashget to insert NEW-VALUE into the hash table
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returned by the second-to-last key.
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tl;dr: DWIM SETF function for HASHGET."
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(if more-keys
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(setf (gethash (car (last more-keys))
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(apply #'hashget hash key (butlast more-keys)))
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new-value)
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(setf (gethash key hash) new-value)))
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;;; Strings
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(defun strcat (string &rest more-strings)
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(apply #'concatenate 'string string more-strings))
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(defun dequote (string)
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(let ((len (length string)))
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(if (and (> len 1) (starts-with #\" string) (ends-with #\" string))
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(subseq string 1 (- len 1))
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string)))
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;;;
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;;; At
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;;;
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(defgeneric at (doc &rest keys))
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(defgeneric (setf at) (new-value doc key &rest more-keys))
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(defmethod at ((doc hash-table) &rest keys)
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(apply #'hashget doc keys))
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(defmethod (setf at) (new-value (doc hash-table) key &rest more-keys)
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(apply #'(setf hashget) new-value doc key more-keys))
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(defmethod at ((doc list) &rest keys)
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(reduce (lambda (alist key)
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(cdr (assoc key alist :test #'equal)))
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keys :initial-value doc))
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(defmethod (setf at) (new-value (doc list) key &rest more-keys)
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(if more-keys
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(setf (cdr (assoc (car (last more-keys))
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(apply #'at doc key (butlast more-keys))
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:test #'equal))
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new-value)
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(setf (cdr (assoc key doc :test #'equal)) new-value)))
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;; A playful alias.
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(defun @ (doc &rest keys)
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(apply #'at doc keys))
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(defun (setf @) (new-value doc key &rest more-keys)
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(apply #'(setf at) new-value doc key more-keys))
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