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Diffstat (limited to 'users/wpcarro/emacs/.emacs.d/wpc/struct.el')
-rw-r--r-- | users/wpcarro/emacs/.emacs.d/wpc/struct.el | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/struct.el b/users/wpcarro/emacs/.emacs.d/wpc/struct.el deleted file mode 100644 index eeea04bf26bc..000000000000 --- a/users/wpcarro/emacs/.emacs.d/wpc/struct.el +++ /dev/null @@ -1,85 +0,0 @@ -;;; struct.el --- Helpers for working with structs -*- lexical-binding: t -*- - -;; Author: William Carroll <wpcarro@gmail.com> -;; Version: 0.0.1 -;; Package-Requires: ((emacs "24.3")) - -;;; Commentary: -;; Provides new macros for working with structs. Also provides adapter -;; interfaces to existing struct macros, that should have more intuitive -;; interfaces. -;; -;; Sometimes `setf' just isn't enough. - -;;; Code: - -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;; Dependencies -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - -(require 'string) -(require 'dash) - -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;; Library -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - -(defvar struct--enable-tests? t - "When t, run the test suite defined herein.") - -(defmacro struct-update (type field f xs) - "Apply F to FIELD in XS, which is a struct of TYPE. -This is immutable." - (let ((copier (->> type - symbol-name - (string-prepend "copy-") - intern)) - (accessor (->> field - symbol-name - (string-prepend (string-concat (symbol-name type) "-")) - intern))) - `(let ((copy (,copier ,xs))) - (setf (,accessor copy) (funcall ,f (,accessor copy))) - copy))) - -(defmacro struct-set (type field x xs) - "Immutably set FIELD in XS (struct TYPE) to X." - (let ((copier (->> type - symbol-name - (string-prepend "copy-") - intern)) - (accessor (->> field - symbol-name - (string-prepend (string-concat (symbol-name type) "-")) - intern))) - `(let ((copy (,copier ,xs))) - (setf (,accessor copy) ,x) - copy))) - -(defmacro struct-set! (type field x xs) - "Set FIELD in XS (struct TYPE) to X mutably. -This is an adapter interface to `setf'." - (let ((accessor (->> field - symbol-name - (string-prepend (string-concat (symbol-name type) "-")) - intern))) - `(progn - (setf (,accessor ,xs) ,x) - ,xs))) - -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;; Tests -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - -(when struct--enable-tests? - (cl-defstruct dummy name age) - (defvar struct--test-dummy (make-dummy :name "Roofus" :age 19)) - (struct-set! dummy name "Doofus" struct--test-dummy) - (prelude-assert (string= "Doofus" (dummy-name struct--test-dummy))) - (let ((result (struct-set dummy name "Shoofus" struct--test-dummy))) - ;; Test the immutability of `struct-set' - (prelude-assert (string= "Doofus" (dummy-name struct--test-dummy))) - (prelude-assert (string= "Shoofus" (dummy-name result))))) - -(provide 'struct) -;;; struct.el ends here |