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-;;; ht.el --- The missing hash table library for Emacs
-
-;; Copyright (C) 2013 Wilfred Hughes
-
-;; Author: Wilfred Hughes <me@wilfred.me.uk>
-;; Version: 2.3
-;; Package-Version: 20180129.2234
-;; Keywords: hash table, hash map, hash
-;; Package-Requires: ((dash "2.12.0"))
-
-;; This program is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; This program is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; The missing hash table library for Emacs.
-;;
-;; See documentation at https://github.com/Wilfred/ht.el
-
-;;; Code:
-
-(require 'dash)
-
-(defmacro ht (&rest pairs)
-  "Create a hash table with the key-value pairs given.
-Keys are compared with `equal'.
-
-\(fn (KEY-1 VALUE-1) (KEY-2 VALUE-2) ...)"
-  (let* ((table-symbol (make-symbol "ht-temp"))
-         (assignments
-          (mapcar
-           (lambda (pair) `(ht-set! ,table-symbol ,@pair))
-           pairs)))
-    `(let ((,table-symbol (ht-create)))
-       ,@assignments
-       ,table-symbol)))
-
-(defsubst ht-set! (table key value)
-  "Associate KEY in TABLE with VALUE."
-  (puthash key value table)
-  nil)
-
-(defalias 'ht-set 'ht-set!)
-
-(defsubst ht-create (&optional test)
-  "Create an empty hash table.
-
-TEST indicates the function used to compare the hash
-keys.  Default is `equal'.  It can be `eq', `eql', `equal' or a
-user-supplied test created via `define-hash-table-test'."
-  (make-hash-table :test (or test 'equal)))
-
-(defun ht<-alist (alist &optional test)
-  "Create a hash table with initial values according to ALIST.
-
-TEST indicates the function used to compare the hash
-keys.  Default is `equal'.  It can be `eq', `eql', `equal' or a
-user-supplied test created via `define-hash-table-test'."
-  (let ((h (ht-create test)))
-    ;; the first key-value pair in an alist gets precedence, so we
-    ;; start from the end of the list:
-    (dolist (pair (reverse alist) h)
-      (let ((key (car pair))
-            (value (cdr pair)))
-        (ht-set! h key value)))))
-
-(defalias 'ht-from-alist 'ht<-alist)
-
-(defun ht<-plist (plist &optional test)
-  "Create a hash table with initial values according to PLIST.
-
-TEST indicates the function used to compare the hash
-keys.  Default is `equal'.  It can be `eq', `eql', `equal' or a
-user-supplied test created via `define-hash-table-test'."
-  (let ((h (ht-create test)))
-    (dolist (pair (nreverse (-partition 2 plist)) h)
-      (let ((key (car pair))
-            (value (cadr pair)))
-        (ht-set! h key value)))))
-
-(defalias 'ht-from-plist 'ht<-plist)
-
-(defsubst ht-get (table key &optional default)
-  "Look up KEY in TABLE, and return the matching value.
-If KEY isn't present, return DEFAULT (nil if not specified)."
-  (gethash key table default))
-
-(defun ht-get* (table &rest keys)
-  "Look up KEYS in nested hash tables, starting with TABLE.
-The lookup for each key should return another hash table, except
-for the final key, which may return any value."
-  (if (cdr keys)
-      (apply #'ht-get* (ht-get table (car keys)) (cdr keys))
-    (ht-get table (car keys))))
-
-(defun ht-update! (table from-table)
-  "Update TABLE according to every key-value pair in FROM-TABLE."
-  (maphash
-   (lambda (key value) (puthash key value table))
-   from-table)
-  nil)
-
-(defalias 'ht-update 'ht-update!)
-
-(defun ht-merge (&rest tables)
-  "Crete a new tables that includes all the key-value pairs from TABLES.
-If multiple have tables have the same key, the value in the last
-table is used."
-  (let ((merged (ht-create)))
-    (mapc (lambda (table) (ht-update! merged table)) tables)
-    merged))
-
-(defsubst ht-remove! (table key)
-  "Remove KEY from TABLE."
-  (remhash key table))
-
-(defalias 'ht-remove 'ht-remove!)
-
-(defsubst ht-clear! (table)
-  "Remove all keys from TABLE."
-  (clrhash table)
-  nil)
-
-(defalias 'ht-clear 'ht-clear!)
-
-(defun ht-map (function table)
-  "Apply FUNCTION to each key-value pair of TABLE, and make a list of the results.
-FUNCTION is called with two arguments, KEY and VALUE."
-  (let (results)
-    (maphash
-     (lambda (key value)
-       (push (funcall function key value) results))
-     table)
-    results))
-
-(defmacro ht-amap (form table)
-  "Anaphoric version of `ht-map'.
-For every key-value pair in TABLE, evaluate FORM with the
-variables KEY and VALUE bound."
-  `(ht-map (lambda (key value) ,form) ,table))
-
-(defun ht-keys (table)
-  "Return a list of all the keys in TABLE."
-  (ht-amap key table))
-
-(defun ht-values (table)
-  "Return a list of all the values in TABLE."
-  (ht-amap value table))
-
-(defun ht-items (table)
-  "Return a list of two-element lists '(key value) from TABLE."
-  (ht-amap (list key value) table))
-
-(defalias 'ht-each 'maphash
-  "Apply FUNCTION to each key-value pair of TABLE.
-Returns nil, used for side-effects only.")
-
-(defmacro ht-aeach (form table)
-  "Anaphoric version of `ht-each'.
-For every key-value pair in TABLE, evaluate FORM with the
-variables key and value bound."
-  `(ht-each (lambda (key value) ,form) ,table))
-
-(defun ht-select-keys (table keys)
-  "Return a copy of TABLE with only the specified KEYS."
-  (let (result)
-    (setq result (make-hash-table :test (hash-table-test table)))
-    (dolist (key keys result)
-      (if (not (equal (gethash key table 'key-not-found) 'key-not-found))
-          (puthash key (gethash key table) result)))))
-
-(defun ht->plist (table)
-  "Return a flat list '(key1 value1 key2 value2...) from TABLE.
-
-Note that hash tables are unordered, so this cannot be an exact
-inverse of `ht<-plist'.  The following is not guaranteed:
-
-\(let ((data '(a b c d)))
-  (equalp data
-          (ht->plist (ht<-plist data))))"
-  (apply 'append (ht-items table)))
-
-(defalias 'ht-to-plist 'ht->plist)
-
-(defsubst ht-copy (table)
-  "Return a shallow copy of TABLE (keys and values are shared)."
-  (copy-hash-table table))
-
-(defun ht->alist (table)
-  "Return a list of two-element lists '(key . value) from TABLE.
-
-Note that hash tables are unordered, so this cannot be an exact
-inverse of `ht<-alist'.  The following is not guaranteed:
-
-\(let ((data '((a . b) (c . d))))
-  (equalp data
-          (ht->alist (ht<-alist data))))"
-  (ht-amap (cons key value) table))
-
-(defalias 'ht-to-alist 'ht->alist)
-
-(defalias 'ht? 'hash-table-p)
-
-(defalias 'ht-p 'hash-table-p)
-
-(defun ht-contains? (table key)
-  "Return 't if TABLE contains KEY."
-  (not (eq (ht-get table key 'ht--not-found) 'ht--not-found)))
-
-(defalias 'ht-contains-p 'ht-contains?)
-
-(defsubst ht-size (table)
-  "Return the actual number of entries in TABLE."
-  (hash-table-count table))
-
-(defsubst ht-empty? (table)
-  "Return true if the actual number of entries in TABLE is zero."
-  (zerop (ht-size table)))
-
-(defun ht-select (function table)
-  "Return a hash table containing all entries in TABLE for which
-FUNCTION returns a truthy value.
-
-FUNCTION is called with two arguments, KEY and VALUE."
-  (let ((results (ht-create)))
-    (ht-each
-     (lambda (key value)
-       (when (funcall function key value)
-         (ht-set! results key value)))
-     table)
-    results))
-
-(defun ht-reject (function table)
-  "Return a hash table containing all entries in TABLE for which
-FUNCTION returns a falsy value.
-
-FUNCTION is called with two arguments, KEY and VALUE."
-  (let ((results (ht-create)))
-    (ht-each
-     (lambda (key value)
-       (unless (funcall function key value)
-         (ht-set! results key value)))
-     table)
-    results))
-
-(defun ht-reject! (function table)
-  "Delete entries from TABLE for which FUNCTION returns a falsy value.
-
-FUNCTION is called with two arguments, KEY and VALUE."
-  (ht-each
-   (lambda (key value)
-     (when (funcall function key value)
-       (remhash key table)))
-   table)
-  nil)
-
-(defalias 'ht-delete-if 'ht-reject!)
-
-(defun ht-find (function table)
-  "Return (key, value) from TABLE for which FUNCTION returns a truthy value.
-Return nil otherwise.
-
-FUNCTION is called with two arguments, KEY and VALUE."
-  (catch 'break
-    (ht-each
-     (lambda (key value)
-       (when (funcall function key value)
-         (throw 'break (list key value))))
-     table)))
-
-(defun ht-equal? (table1 table2)
-  "Return t if TABLE1 and TABLE2 have the same keys and values.
-Does not compare equality predicates."
-  (let ((keys1 (ht-keys table1))
-        (keys2 (ht-keys table2))
-        (sentinel (make-symbol "ht-sentinel")))
-    (and (equal (length keys1) (length keys2))
-         (--all?
-          (equal (ht-get table1 it)
-                 (ht-get table2 it sentinel))
-          keys1))))
-
-(defalias 'ht-equal-p 'ht-equal?)
-
-(provide 'ht)
-;;; ht.el ends here