diff options
author | William Carroll <wpcarro@gmail.com> | 2019-10-09T11·13+0100 |
---|---|---|
committer | William Carroll <wpcarro@gmail.com> | 2019-12-24T15·21+0000 |
commit | 6b456c1b7a4f6899f063a6e65355af51901d9c7a (patch) | |
tree | cfc70d74818ae9fabdbbfb0cf16cce092e4c1a09 /configs/shared/.emacs.d/wpc/scope.el | |
parent | a7c72adb2ebec1e497fc040eaf3551d564d61a5b (diff) |
Massive configuration overhaul
Currently paying the price of months of non-diligent git usage. Here's what has changed. - Theming support in Gvcci and wpgtk - Dropping support for i3 - Supporting EXWM - Many Elisp modules - Collapsed redundant directories in ./configs
Diffstat (limited to 'configs/shared/.emacs.d/wpc/scope.el')
-rw-r--r-- | configs/shared/.emacs.d/wpc/scope.el | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/configs/shared/.emacs.d/wpc/scope.el b/configs/shared/.emacs.d/wpc/scope.el new file mode 100644 index 000000000000..48aa85ad0e5d --- /dev/null +++ b/configs/shared/.emacs.d/wpc/scope.el @@ -0,0 +1,99 @@ +;;; scope.el --- Work with a scope data structure -*- lexical-binding: t -*- +;; Author: William Carroll <wpcarro@gmail.com> + +;;; Commentary: +;; Exposing an API for working with a scope data structure in a non-mutative +;; way. +;; +;; What's a scope? Think of a scope as a stack of key-value bindings. + +;;; Code: + +(require 'alist) +(require 'stack) +(require 'struct) +(require 'macros) + +(cl-defstruct scope scopes) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Create +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(defun scope/new () + "Return an empty scope." + (make-scope :scopes (->> (stack/new) + (stack/push (alist/new))))) + +(defun scope/flatten (xs) + "Return a flattened representation of the scope, XS. +The newest bindings eclipse the oldest." + (->> xs + scope-scopes + stack/to-list + (list/reduce (alist/new) + (lambda (scope acc) + (alist/merge acc scope))))) + +(defun scope/push-new (xs) + "Push a new, empty scope onto XS." + (struct/update scope + scopes + (>> (stack/push (alist/new))) + xs)) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Read +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(defun scope/get (k xs) + "Return K from XS if it's in scope." + (->> xs + scope/flatten + (alist/get k))) + +(defun scope/current (xs) + "Return the newest scope from XS." + (let ((xs-copy (copy-scope xs))) + (->> xs-copy + scope-scopes + stack/peek))) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Update +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(defun scope/set (k v xs) + "Set value, V, at key, K, in XS for the current scope." + (struct/update scope + scopes + (>> (stack/map-top (>> (alist/set k v)))) + xs)) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Delete +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(defun scope/pop (xs) + "Return a new scope without the top element from XS." + (->> xs + scope-scopes + stack/pop)) + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; Predicates +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +(defun scope/defined? (k xs) + "Return t if K is in scope of XS." + (->> xs + scope/flatten + (alist/has-key? k))) + +;; TODO: Find a faster way to write aliases like this. +(defun scope/instance? (xs) + "Return t if XS is a scope struct." + (scope-p xs)) + +(provide 'scope) +;;; scope.el ends here |