861b0bbcb319
Add remhash-* utilities
author | Steve Losh <steve@stevelosh.com> |
---|---|
date | Tue, 30 Apr 2019 17:06:11 -0400 |
parents | 957d61081ff7 |
children | 28724d30efef |
branches/tags | (none) |
files | package.lisp src/hash-tables.lisp |
Changes
--- a/package.lisp Sat Feb 02 14:29:29 2019 -0500 +++ b/package.lisp Tue Apr 30 17:06:11 2019 -0400 @@ -232,7 +232,13 @@ (:documentation "Utilities for operating on hash tables.") (:export :hash-table-contents - :mutate-hash-values)) + :mutate-hash-values + :remhash-if + :remhash-if-not + :remhash-if-key + :remhash-if-not-key + :remhash-if-value + :remhash-if-not-value)) (defpackage :losh.random
--- a/src/hash-tables.lisp Sat Feb 02 14:29:29 2019 -0500 +++ b/src/hash-tables.lisp Tue Apr 30 17:06:11 2019 -0400 @@ -15,3 +15,64 @@ "Return a fresh list of `(key value)` elements of `hash-table`." (gathering (maphash (compose #'gather #'list) hash-table))) +(defun remhash-if (test hash-table) + "Remove elements which satisfy `(test key value)` from `hash-table`. + + Returns the hash table." + (maphash (lambda (k v) + (when (funcall test k v) + (remhash k hash-table))) + hash-table) + hash-table) + +(defun remhash-if-not (test hash-table) + "Remove elements which don't satisfy `(test key value)` from `hash-table`. + + Returns the hash table." + (maphash (lambda (k v) + (unless (funcall test k v) + (remhash k hash-table))) + hash-table) + hash-table) + +(defun remhash-if-key (test hash-table) + "Remove elements which satisfy `(test key)` from `hash-table`. + + Returns the hash table." + (maphash (lambda (k v) + (declare (ignore v)) + (when (funcall test k) + (remhash k hash-table))) + hash-table) + hash-table) + +(defun remhash-if-not-key (test hash-table) + "Remove elements which satisfy don't `(test key)` from `hash-table`. + + Returns the hash table." + (maphash (lambda (k v) + (declare (ignore v)) + (unless (funcall test k) + (remhash k hash-table))) + hash-table) + hash-table) + +(defun remhash-if-value (test hash-table) + "Remove elements which satisfy `(test value)` from `hash-table`. + + Returns the hash table." + (maphash (lambda (k v) + (when (funcall test v) + (remhash k hash-table))) + hash-table) + hash-table) + +(defun remhash-if-not-value (test hash-table) + "Remove elements which satisfy don't `(test value)` from `hash-table`. + + Returns the hash table." + (maphash (lambda (k v) + (unless (funcall test v) + (remhash k hash-table))) + hash-table) + hash-table)