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1799 lines
72 KiB
EmacsLisp
1799 lines
72 KiB
EmacsLisp
;;; calculator.el --- a [not so] simple calculator for Emacs
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;; Copyright (C) 1998, 2000, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007 Free Software Foundation, Inc.
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;; Author: Eli Barzilay <eli@barzilay.org>
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;; Keywords: tools, convenience
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;; Time-stamp: <2006-02-06 13:36:00 ttn>
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by the
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;; Free Software Foundation; either version 2, or (at your option) any
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;; later version.
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;; GNU Emacs is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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;; MA 02110-1301, USA.
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;;;=====================================================================
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;;; Commentary:
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;;
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;; A calculator for Emacs.
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;; Why should you reach for your mouse to get xcalc (calc.exe, gcalc or
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;; whatever), when you have Emacs running already?
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;;
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;; If this is not part of your Emacs distribution, then simply bind
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;; `calculator' to a key and make it an autoloaded function, e.g.:
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;; (autoload 'calculator "calculator"
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;; "Run the Emacs calculator." t)
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;; (global-set-key [(control return)] 'calculator)
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;;
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;; Written by Eli Barzilay: Maze is Life! eli@barzilay.org
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;; http://www.barzilay.org/
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;;
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;; For latest version, check
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;; http://www.barzilay.org/misc/calculator.el
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;;
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;;; History:
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;; I hate history.
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(eval-and-compile
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(if (fboundp 'defgroup) nil
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(defmacro defgroup (&rest forms) nil)
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(defmacro defcustom (s v d &rest r) (list 'defvar s v d))))
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;;;=====================================================================
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;;; Customization:
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(defgroup calculator nil
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"Simple Emacs calculator."
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:prefix "calculator"
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:version "21.1"
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:group 'tools
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:group 'convenience)
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(defcustom calculator-electric-mode nil
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"*Run `calculator' electrically, in the echo area.
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Electric mode saves some place but changes the way you interact with the
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calculator."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-use-menu t
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"*Make `calculator' create a menu.
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Note that this requires easymenu. Must be set before loading."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-bind-escape nil
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"*If non-nil, set escape to exit the calculator."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-unary-style 'postfix
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"*Value is either 'prefix or 'postfix.
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This determines the default behavior of unary operators."
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:type '(choice (const prefix) (const postfix))
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:group 'calculator)
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(defcustom calculator-prompt "Calc=%s> "
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"*The prompt used by the Emacs calculator.
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It should contain a \"%s\" somewhere that will indicate the i/o radixes;
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this will be a two-character string as described in the documentation
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for `calculator-mode'."
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:type 'string
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:group 'calculator)
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(defcustom calculator-number-digits 3
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"*The calculator's number of digits used for standard display.
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Used by the `calculator-standard-display' function - it will use the
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format string \"%.NC\" where this number is N and C is a character given
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at runtime."
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:type 'integer
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:group 'calculator)
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(defcustom calculator-radix-grouping-mode t
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"*Use digit grouping in radix output mode.
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If this is set, chunks of `calculator-radix-grouping-digits' characters
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will be separated by `calculator-radix-grouping-separator' when in radix
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output mode is active (determined by `calculator-output-radix')."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-radix-grouping-digits 4
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"*The number of digits used for grouping display in radix modes.
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See `calculator-radix-grouping-mode'."
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:type 'integer
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:group 'calculator)
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(defcustom calculator-radix-grouping-separator "'"
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"*The separator used in radix grouping display.
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See `calculator-radix-grouping-mode'."
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:type 'string
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:group 'calculator)
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(defcustom calculator-remove-zeros t
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"*Non-nil value means delete all redundant zero decimal digits.
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If this value is not t, and not nil, redundant zeros are removed except
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for one and if it is nil, nothing is removed.
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Used by the `calculator-remove-zeros' function."
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:type '(choice (const t) (const leave-decimal) (const nil))
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:group 'calculator)
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(defcustom calculator-displayer '(std ?n)
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"*A displayer specification for numerical values.
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This is the displayer used to show all numbers in an expression. Result
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values will be displayed according to the first element of
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`calculator-displayers'.
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The displayer is a symbol, a string or an expression. A symbol should
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be the name of a one-argument function, a string is used with a single
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argument and an expression will be evaluated with the variable `num'
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bound to whatever should be displayed. If it is a function symbol, it
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should be able to handle special symbol arguments, currently 'left and
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'right which will be sent by special keys to modify display parameters
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associated with the displayer function (for example to change the number
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of digits displayed).
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An exception to the above is the case of the list (std C) where C is a
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character, in this case the `calculator-standard-displayer' function
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will be used with this character for a format string."
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:group 'calculator)
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(defcustom calculator-displayers
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'(((std ?n) "Standard display, decimal point or scientific")
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(calculator-eng-display "Eng display")
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((std ?f) "Standard display, decimal point")
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((std ?e) "Standard display, scientific")
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("%S" "Emacs printer"))
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"*A list of displayers.
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Each element is a list of a displayer and a description string. The
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first element is the one which is currently used, this is for the display
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of result values not values in expressions. A displayer specification
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is the same as the values that can be stored in `calculator-displayer'.
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`calculator-rotate-displayer' rotates this list."
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:type 'sexp
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:group 'calculator)
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(defcustom calculator-paste-decimals t
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"*If non-nil, convert pasted integers so they have a decimal point.
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This makes it possible to paste big integers since they will be read as
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floats, otherwise the Emacs reader will fail on them."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-copy-displayer nil
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"*If non-nil, this is any value that can be used for
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`calculator-displayer', to format a string before copying it with
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`calculator-copy'. If nil, then `calculator-displayer's normal value is
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used."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-2s-complement nil
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"*If non-nil, show negative numbers in 2s complement in radix modes.
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Otherwise show as a negative number."
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:type 'boolean
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:group 'calculator)
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(defcustom calculator-mode-hook nil
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"*List of hook functions for `calculator-mode' to run.
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Note: if `calculator-electric-mode' is on, then this hook will get
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activated in the minibuffer - in that case it should not do much more
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than local key settings and other effects that will change things
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outside the scope of calculator related code."
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:type 'hook
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:group 'calculator)
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(defcustom calculator-user-registers nil
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"*An association list of user-defined register bindings.
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Each element in this list is a list of a character and a number that
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will be stored in that character's register.
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For example, use this to define the golden ratio number:
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(setq calculator-user-registers '((?g . 1.61803398875)))
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before you load calculator."
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:type '(repeat (cons character number))
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:set '(lambda (_ val)
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(and (boundp 'calculator-registers)
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(setq calculator-registers
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(append val calculator-registers)))
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(setq calculator-user-registers val))
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:group 'calculator)
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(defcustom calculator-user-operators nil
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"*A list of additional operators.
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This is a list in the same format as specified in the documentation for
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`calculator-operators', that you can use to bind additional calculator
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operators. It is probably not a good idea to modify this value with
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`customize' since it is too complex...
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Examples:
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* A very simple one, adding a postfix \"x-to-y\" conversion keys, using
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t as a prefix key:
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(setq calculator-user-operators
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'((\"tf\" cl-to-fr (+ 32 (/ (* X 9) 5)) 1)
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(\"tc\" fr-to-cl (/ (* (- X 32) 5) 9) 1)
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(\"tp\" kg-to-lb (/ X 0.453592) 1)
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(\"tk\" lb-to-kg (* X 0.453592) 1)
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(\"tF\" mt-to-ft (/ X 0.3048) 1)
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(\"tM\" ft-to-mt (* X 0.3048) 1)))
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* Using a function-like form is very simple, X for an argument (Y the
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second in case of a binary operator), TX is a truncated version of X
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and F does a recursive call, Here is a [very inefficient] Fibonacci
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number calculation:
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(add-to-list 'calculator-user-operators
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'(\"F\" fib (if (<= TX 1)
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1
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(+ (F (- TX 1)) (F (- TX 2)))) 0))
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Note that this will be either postfix or prefix, according to
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`calculator-unary-style'."
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:type '(repeat (list string symbol sexp integer integer))
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:group 'calculator)
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;;;=====================================================================
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;;; Code:
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;;;---------------------------------------------------------------------
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;;; Variables
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(defvar calculator-initial-operators
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'(;; "+"/"-" have keybindings of themselves, not calculator-ops
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("=" = identity 1 -1)
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(nobind "+" + + 2 4)
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(nobind "-" - - 2 4)
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(nobind "+" + + -1 9)
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(nobind "-" - - -1 9)
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("(" \( identity -1 -1)
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(")" \) identity +1 10)
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;; normal keys
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("|" or (logior TX TY) 2 2)
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("#" xor (logxor TX TY) 2 2)
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("&" and (logand TX TY) 2 3)
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("*" * * 2 5)
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("/" / / 2 5)
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("\\" div (/ TX TY) 2 5)
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("%" rem (% TX TY) 2 5)
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("L" log log 2 6)
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("S" sin (sin DX) x 6)
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("C" cos (cos DX) x 6)
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("T" tan (tan DX) x 6)
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("IS" asin (D (asin X)) x 6)
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("IC" acos (D (acos X)) x 6)
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("IT" atan (D (atan X)) x 6)
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("Q" sqrt sqrt x 7)
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("^" ^ expt 2 7)
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("!" ! calculator-fact x 7)
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(";" 1/ (/ 1 X) 1 7)
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("_" - - 1 8)
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("~" ~ (lognot TX) x 8)
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(">" repR calculator-repR 1 8)
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("<" repL calculator-repL 1 8)
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("v" avg (/ (apply '+ L) (length L)) 0 8)
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("l" tot (apply '+ L) 0 8)
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)
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"A list of initial operators.
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This is a list in the same format as `calculator-operators'. Whenever
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`calculator' starts, it looks at the value of this variable, and if it
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is not empty, its contents is prepended to `calculator-operators' and
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the appropriate key bindings are made.
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This variable is then reset to nil. Don't use this if you want to add
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user-defined operators, use `calculator-user-operators' instead.")
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(defvar calculator-operators nil
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"The calculator operators, each a list with:
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1. The key that is bound to for this operation (usually a string);
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2. The displayed symbol for this function;
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3. The function symbol, or a form that uses the variables `X' and `Y',
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(if it is a binary operator), `TX' and `TY' (truncated integer
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versions), `DX' (converted to radians if degrees mode is on), `D'
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(function for converting radians to degrees if deg mode is on), `L'
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(list of saved values), `F' (function for recursive iteration calls)
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and evaluates to the function value - these variables are capital;
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4. The function's arity, optional, one of: 2 => binary, -1 => prefix
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unary, +1 => postfix unary, 0 => a 0-arg operator func, non-number =>
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postfix/prefix as determined by `calculator-unary-style' (the
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default);
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5. The function's precedence - should be in the range of 1 (lowest) to
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9 (highest) (optional, defaults to 1);
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It it possible have a unary prefix version of a binary operator if it
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comes later in this list. If the list begins with the symbol 'nobind,
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then no key binding will take place - this is only useful for predefined
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keys.
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Use `calculator-user-operators' to add operators to this list, see its
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documentation for an example.")
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(defvar calculator-stack nil
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"Stack contents - operations and operands.")
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(defvar calculator-curnum nil
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"Current number being entered (as a string).")
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(defvar calculator-stack-display nil
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"Cons of the stack and its string representation.")
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(defvar calculator-char-radix
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'((?D . nil) (?B . bin) (?O . oct) (?H . hex) (?X . hex))
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"A table to convert input characters to corresponding radix symbols.")
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(defvar calculator-output-radix nil
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"The mode for display, one of: nil (decimal), 'bin, 'oct or 'hex.")
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(defvar calculator-input-radix nil
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"The mode for input, one of: nil (decimal), 'bin, 'oct or 'hex.")
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(defvar calculator-deg nil
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"Non-nil if trig functions operate on degrees instead of radians.")
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(defvar calculator-saved-list nil
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"A list of saved values collected.")
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(defvar calculator-saved-ptr 0
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"The pointer to the current saved number.")
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(defvar calculator-add-saved nil
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"Bound to t when a value should be added to the saved-list.")
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(defvar calculator-display-fragile nil
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"When non-nil, we see something that the next digit should replace.")
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(defvar calculator-buffer nil
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"The current calculator buffer.")
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(defvar calculator-eng-extra nil
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"Internal value used by `calculator-eng-display'.")
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(defvar calculator-eng-tmp-show nil
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"Internal value used by `calculator-eng-display'.")
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(defvar calculator-last-opXY nil
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"The last binary operation and its arguments.
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Used for repeating operations in calculator-repR/L.")
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(defvar calculator-registers ; use user-bindings first
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(append calculator-user-registers (list (cons ?e e) (cons ?p pi)))
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"The association list of calculator register values.")
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(defvar calculator-saved-global-map nil
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"Saved global key map.")
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(defvar calculator-restart-other-mode nil
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"Used to hack restarting with the electric mode changed.")
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;;;---------------------------------------------------------------------
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;;; Key bindings
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(defvar calculator-mode-map nil
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"The calculator key map.")
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(or calculator-mode-map
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(let ((map (make-sparse-keymap)))
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(suppress-keymap map t)
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(define-key map "i" nil)
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(define-key map "o" nil)
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(let ((p
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'((calculator-open-paren "[")
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(calculator-close-paren "]")
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(calculator-op-or-exp "+" "-" [kp-add] [kp-subtract])
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(calculator-digit "0" "1" "2" "3" "4" "5" "6" "7" "8"
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"9" "a" "b" "c" "d" "f"
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[kp-0] [kp-1] [kp-2] [kp-3] [kp-4]
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[kp-5] [kp-6] [kp-7] [kp-8] [kp-9])
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(calculator-op [kp-divide] [kp-multiply])
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(calculator-decimal "." [kp-decimal])
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(calculator-exp "e")
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(calculator-dec/deg-mode "D")
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(calculator-set-register "s")
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(calculator-get-register "g")
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(calculator-radix-mode "H" "X" "O" "B")
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(calculator-radix-input-mode "id" "ih" "ix" "io" "ib"
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"iD" "iH" "iX" "iO" "iB")
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(calculator-radix-output-mode "od" "oh" "ox" "oo" "ob"
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"oD" "oH" "oX" "oO" "oB")
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(calculator-rotate-displayer "'")
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(calculator-rotate-displayer-back "\"")
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(calculator-displayer-prev "{")
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(calculator-displayer-next "}")
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(calculator-saved-up [up] [?\C-p])
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(calculator-saved-down [down] [?\C-n])
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(calculator-quit "q" [?\C-g])
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(calculator-enter [enter] [linefeed] [kp-enter]
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[return] [?\r] [?\n])
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(calculator-save-on-list " " [space])
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(calculator-clear-saved [?\C-c] [(control delete)])
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(calculator-save-and-quit [(control return)]
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[(control kp-enter)])
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(calculator-paste [insert] [(shift insert)]
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[paste] [mouse-2] [?\C-y])
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(calculator-clear [delete] [?\C-?] [?\C-d])
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(calculator-help [?h] [??] [f1] [help])
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(calculator-copy [(control insert)] [copy])
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(calculator-backspace [backspace])
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)))
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(while p
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;; reverse the keys so first defs come last - makes the more
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;; sensible bindings visible in the menu
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(let ((func (car (car p))) (keys (reverse (cdr (car p)))))
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(while keys
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(define-key map (car keys) func)
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(setq keys (cdr keys))))
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(setq p (cdr p))))
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(if calculator-bind-escape
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(progn (define-key map [?\e] 'calculator-quit)
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(define-key map [escape] 'calculator-quit))
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(define-key map [?\e ?\e ?\e] 'calculator-quit))
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;; make C-h work in text-mode
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(or window-system (define-key map [?\C-h] 'calculator-backspace))
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;; set up a menu
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(if (and calculator-use-menu (not (boundp 'calculator-menu)))
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(let ((radix-selectors
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(mapcar (lambda (x)
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`([,(nth 0 x)
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(calculator-radix-mode ,(nth 2 x))
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:style radio
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:keys ,(nth 2 x)
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:selected
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(and
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(eq calculator-input-radix ',(nth 1 x))
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(eq calculator-output-radix ',(nth 1 x)))]
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[,(concat (nth 0 x) " Input")
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|
(calculator-radix-input-mode ,(nth 2 x))
|
|
:keys ,(concat "i" (downcase (nth 2 x)))
|
|
:style radio
|
|
:selected
|
|
(eq calculator-input-radix ',(nth 1 x))]
|
|
[,(concat (nth 0 x) " Output")
|
|
(calculator-radix-output-mode ,(nth 2 x))
|
|
:keys ,(concat "o" (downcase (nth 2 x)))
|
|
:style radio
|
|
:selected
|
|
(eq calculator-output-radix ',(nth 1 x))]))
|
|
'(("Decimal" nil "D")
|
|
("Binary" bin "B")
|
|
("Octal" oct "O")
|
|
("Hexadecimal" hex "H"))))
|
|
(op '(lambda (name key)
|
|
`[,name (calculator-op ,key) :keys ,key])))
|
|
(easy-menu-define
|
|
calculator-menu map "Calculator menu."
|
|
`("Calculator"
|
|
["Help"
|
|
(let ((last-command 'calculator-help)) (calculator-help))
|
|
:keys "?"]
|
|
"---"
|
|
["Copy" calculator-copy]
|
|
["Paste" calculator-paste]
|
|
"---"
|
|
["Electric mode"
|
|
(progn (calculator-quit)
|
|
(setq calculator-restart-other-mode t)
|
|
(run-with-timer 0.1 nil '(lambda () (message nil)))
|
|
;; the message from the menu will be visible,
|
|
;; couldn't make it go away...
|
|
(calculator))
|
|
:active (not calculator-electric-mode)]
|
|
["Normal mode"
|
|
(progn (setq calculator-restart-other-mode t)
|
|
(calculator-quit))
|
|
:active calculator-electric-mode]
|
|
"---"
|
|
("Functions"
|
|
,(funcall op "Repeat-right" ">")
|
|
,(funcall op "Repeat-left" "<")
|
|
"------General------"
|
|
,(funcall op "Reciprocal" ";")
|
|
,(funcall op "Log" "L")
|
|
,(funcall op "Square-root" "Q")
|
|
,(funcall op "Factorial" "!")
|
|
"------Trigonometric------"
|
|
,(funcall op "Sinus" "S")
|
|
,(funcall op "Cosine" "C")
|
|
,(funcall op "Tangent" "T")
|
|
,(funcall op "Inv-Sinus" "IS")
|
|
,(funcall op "Inv-Cosine" "IC")
|
|
,(funcall op "Inv-Tangent" "IT")
|
|
"------Bitwise------"
|
|
,(funcall op "Or" "|")
|
|
,(funcall op "Xor" "#")
|
|
,(funcall op "And" "&")
|
|
,(funcall op "Not" "~"))
|
|
("Saved List"
|
|
["Eval+Save" calculator-save-on-list]
|
|
["Prev number" calculator-saved-up]
|
|
["Next number" calculator-saved-down]
|
|
["Delete current" calculator-clear
|
|
:active (and calculator-display-fragile
|
|
calculator-saved-list
|
|
(= (car calculator-stack)
|
|
(nth calculator-saved-ptr
|
|
calculator-saved-list)))]
|
|
["Delete all" calculator-clear-saved]
|
|
"---"
|
|
,(funcall op "List-total" "l")
|
|
,(funcall op "List-average" "v"))
|
|
("Registers"
|
|
["Get register" calculator-get-register]
|
|
["Set register" calculator-set-register])
|
|
("Modes"
|
|
["Radians"
|
|
(progn
|
|
(and (or calculator-input-radix calculator-output-radix)
|
|
(calculator-radix-mode "D"))
|
|
(and calculator-deg (calculator-dec/deg-mode)))
|
|
:keys "D"
|
|
:style radio
|
|
:selected (not (or calculator-input-radix
|
|
calculator-output-radix
|
|
calculator-deg))]
|
|
["Degrees"
|
|
(progn
|
|
(and (or calculator-input-radix calculator-output-radix)
|
|
(calculator-radix-mode "D"))
|
|
(or calculator-deg (calculator-dec/deg-mode)))
|
|
:keys "D"
|
|
:style radio
|
|
:selected (and calculator-deg
|
|
(not (or calculator-input-radix
|
|
calculator-output-radix)))]
|
|
"---"
|
|
,@(mapcar 'car radix-selectors)
|
|
("Separate I/O"
|
|
,@(mapcar (lambda (x) (nth 1 x)) radix-selectors)
|
|
"---"
|
|
,@(mapcar (lambda (x) (nth 2 x)) radix-selectors)))
|
|
("Decimal Display"
|
|
,@(mapcar (lambda (d)
|
|
(vector (cadr d)
|
|
;; Note: inserts actual object here
|
|
`(calculator-rotate-displayer ',d)))
|
|
calculator-displayers)
|
|
"---"
|
|
["Change Prev Display" calculator-displayer-prev]
|
|
["Change Next Display" calculator-displayer-next])
|
|
"---"
|
|
["Copy+Quit" calculator-save-and-quit]
|
|
["Quit" calculator-quit]))))
|
|
(setq calculator-mode-map map)))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Startup and mode stuff
|
|
|
|
(defun calculator-mode ()
|
|
;; this help is also used as the major help screen
|
|
"A [not so] simple calculator for Emacs.
|
|
|
|
This calculator is used in the same way as other popular calculators
|
|
like xcalc or calc.exe - but using an Emacs interface.
|
|
|
|
Expressions are entered using normal infix notation, parens are used as
|
|
normal. Unary functions are usually postfix, but some depends on the
|
|
value of `calculator-unary-style' (if the style for an operator below is
|
|
specified, then it is fixed, otherwise it depends on this variable).
|
|
`+' and `-' can be used as either binary operators or prefix unary
|
|
operators. Numbers can be entered with exponential notation using `e',
|
|
except when using a non-decimal radix mode for input (in this case `e'
|
|
will be the hexadecimal digit).
|
|
|
|
Here are the editing keys:
|
|
* `RET' `=' evaluate the current expression
|
|
* `C-insert' copy the whole current expression to the `kill-ring'
|
|
* `C-return' evaluate, save result the `kill-ring' and exit
|
|
* `insert' paste a number if the one was copied (normally)
|
|
* `delete' `C-d' clear last argument or whole expression (hit twice)
|
|
* `backspace' delete a digit or a previous expression element
|
|
* `h' `?' pop-up a quick reference help
|
|
* `ESC' `q' exit (`ESC' can be used if `calculator-bind-escape' is
|
|
non-nil, otherwise use three consecutive `ESC's)
|
|
|
|
These operators are pre-defined:
|
|
* `+' `-' `*' `/' the common binary operators
|
|
* `\\' `%' integer division and reminder
|
|
* `_' `;' postfix unary negation and reciprocal
|
|
* `^' `L' binary operators for x^y and log(x) in base y
|
|
* `Q' `!' unary square root and factorial
|
|
* `S' `C' `T' unary trigonometric operators - sin, cos and tan
|
|
* `|' `#' `&' `~' bitwise operators - or, xor, and, not
|
|
|
|
The trigonometric functions can be inverted if prefixed with an `I', see
|
|
below for the way to use degrees instead of the default radians.
|
|
|
|
Two special postfix unary operators are `>' and `<': whenever a binary
|
|
operator is performed, it is remembered along with its arguments; then
|
|
`>' (`<') will apply the same operator with the same right (left)
|
|
argument.
|
|
|
|
hex/oct/bin modes can be set for input and for display separately.
|
|
Another toggle-able mode is for using degrees instead of radians for
|
|
trigonometric functions.
|
|
The keys to switch modes are (`X' is shortcut for `H'):
|
|
* `D' switch to all-decimal mode, or toggle degrees/radians
|
|
* `B' `O' `H' `X' binary/octal/hexadecimal modes for input & display
|
|
* `i' `o' followed by one of `D' `B' `O' `H' `X' (case
|
|
insensitive) sets only the input or display radix mode
|
|
The prompt indicates the current modes:
|
|
* \"D=\": degrees mode;
|
|
* \"?=\": (? is B/O/H) this is the radix for both input and output;
|
|
* \"=?\": (? is B/O/H) the display radix (when input is decimal);
|
|
* \"??\": (? is D/B/O/H) 1st char for input radix, 2nd for display.
|
|
|
|
Also, the quote key can be used to switch display modes for decimal
|
|
numbers (double-quote rotates back), and the two brace characters
|
|
\(\"{\" and \"}\" change display parameters that these displayers use (if
|
|
they handle such). If output is using any radix mode, then these keys
|
|
toggle digit grouping mode and the chunk size.
|
|
|
|
Values can be saved for future reference in either a list of saved
|
|
values, or in registers.
|
|
|
|
The list of saved values is useful for statistics operations on some
|
|
collected data. It is possible to navigate in this list, and if the
|
|
value shown is the current one on the list, an indication is displayed
|
|
as \"[N]\" if this is the last number and there are N numbers, or
|
|
\"[M/N]\" if the M-th value is shown.
|
|
* `SPC' evaluate the current value as usual, but also adds
|
|
the result to the list of saved values
|
|
* `l' `v' computes total / average of saved values
|
|
* `up' `C-p' browse to the previous value in the list
|
|
* `down' `C-n' browse to the next value in the list
|
|
* `delete' `C-d' remove current value from the list (if it is on it)
|
|
* `C-delete' `C-c' delete the whole list
|
|
|
|
Registers are variable-like place-holders for values:
|
|
* `s' followed by a character attach the current value to that character
|
|
* `g' followed by a character fetches the attached value
|
|
|
|
There are many variables that can be used to customize the calculator.
|
|
Some interesting customization variables are:
|
|
* `calculator-electric-mode' use only the echo-area electrically.
|
|
* `calculator-unary-style' set most unary ops to pre/postfix style.
|
|
* `calculator-user-registers' to define user-preset registers.
|
|
* `calculator-user-operators' to add user-defined operators.
|
|
See the documentation for these variables, and \"calculator.el\" for
|
|
more information.
|
|
|
|
\\{calculator-mode-map}"
|
|
(interactive)
|
|
(kill-all-local-variables)
|
|
(setq major-mode 'calculator-mode)
|
|
(setq mode-name "Calculator")
|
|
(use-local-map calculator-mode-map)
|
|
(run-mode-hooks 'calculator-mode-hook))
|
|
|
|
(eval-when-compile (require 'electric) (require 'ehelp))
|
|
|
|
;;;###autoload
|
|
(defun calculator ()
|
|
"Run the Emacs calculator.
|
|
See the documentation for `calculator-mode' for more information."
|
|
(interactive)
|
|
(if calculator-restart-other-mode
|
|
(setq calculator-electric-mode (not calculator-electric-mode)))
|
|
(if calculator-initial-operators
|
|
(progn (calculator-add-operators calculator-initial-operators)
|
|
(setq calculator-initial-operators nil)
|
|
;; don't change this since it is a customization variable,
|
|
;; its set function will add any new operators
|
|
(calculator-add-operators calculator-user-operators)))
|
|
(setq calculator-buffer (get-buffer-create "*calculator*"))
|
|
(if calculator-electric-mode
|
|
(save-window-excursion
|
|
(progn (require 'electric) (message nil)) ; hide load message
|
|
(let (old-g-map old-l-map (echo-keystrokes 0)
|
|
(garbage-collection-messages nil)) ; no gc msg when electric
|
|
(set-window-buffer (minibuffer-window) calculator-buffer)
|
|
(select-window (minibuffer-window))
|
|
(calculator-reset)
|
|
(calculator-update-display)
|
|
(setq old-l-map (current-local-map))
|
|
(setq old-g-map (current-global-map))
|
|
(setq calculator-saved-global-map (current-global-map))
|
|
(use-local-map nil)
|
|
(use-global-map calculator-mode-map)
|
|
(run-hooks 'calculator-mode-hook)
|
|
(unwind-protect
|
|
(catch 'calculator-done
|
|
(Electric-command-loop
|
|
'calculator-done
|
|
;; can't use 'noprompt, bug in electric.el
|
|
'(lambda () 'noprompt)
|
|
nil
|
|
(lambda (x y) (calculator-update-display))))
|
|
(and calculator-buffer
|
|
(catch 'calculator-done (calculator-quit)))
|
|
(use-local-map old-l-map)
|
|
(use-global-map old-g-map))))
|
|
(progn
|
|
(cond
|
|
((not (get-buffer-window calculator-buffer))
|
|
(let ((split-window-keep-point nil)
|
|
(window-min-height 2))
|
|
;; maybe leave two lines for our window because of the normal
|
|
;; `raised' modeline in Emacs 21
|
|
(select-window
|
|
(split-window-vertically
|
|
;; If the modeline might interfere with the calculator buffer,
|
|
;; use 3 lines instead.
|
|
(if (and (fboundp 'face-attr-construct)
|
|
(let* ((dh (plist-get (face-attr-construct 'default) :height))
|
|
(mf (face-attr-construct 'modeline))
|
|
(mh (plist-get mf :height)))
|
|
;; If the modeline is shorter than the default,
|
|
;; stick with 2 lines. (It may be necessary to
|
|
;; check how much shorter.)
|
|
(and
|
|
(not
|
|
(or (and (integerp dh)
|
|
(integerp mh)
|
|
(< mh dh))
|
|
(and (numberp mh)
|
|
(not (integerp mh))
|
|
(< mh 1))))
|
|
(or
|
|
;; If the modeline is taller than the default,
|
|
;; use 3 lines.
|
|
(and (integerp dh)
|
|
(integerp mh)
|
|
(> mh dh))
|
|
(and (numberp mh)
|
|
(not (integerp mh))
|
|
(> mh 1))
|
|
;; If the modeline has a box with non-negative line-width,
|
|
;; use 3 lines.
|
|
(let* ((bx (plist-get mf :box))
|
|
(lh (plist-get bx :line-width)))
|
|
(and bx
|
|
(or
|
|
(not lh)
|
|
(> lh 0))))
|
|
;; If the modeline has an overline, use 3 lines.
|
|
(plist-get (face-attr-construct 'modeline) :overline)))))
|
|
-3 -2)))
|
|
(switch-to-buffer calculator-buffer)))
|
|
((not (eq (current-buffer) calculator-buffer))
|
|
(select-window (get-buffer-window calculator-buffer))))
|
|
(calculator-mode)
|
|
(setq buffer-read-only t)
|
|
(calculator-reset)
|
|
(message "Hit `?' For a quick help screen.")))
|
|
(if (and calculator-restart-other-mode calculator-electric-mode)
|
|
(calculator)))
|
|
|
|
(defun calculator-message (string &rest arguments)
|
|
"Same as `message', but special handle of electric mode."
|
|
(apply 'message string arguments)
|
|
(if calculator-electric-mode
|
|
(progn (sit-for 1) (message nil))))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Operators
|
|
|
|
(defun calculator-op-arity (op)
|
|
"Return OP's arity, 2, +1 or -1."
|
|
(let ((arity (or (nth 3 op) 'x)))
|
|
(if (numberp arity)
|
|
arity
|
|
(if (eq calculator-unary-style 'postfix) +1 -1))))
|
|
|
|
(defun calculator-op-prec (op)
|
|
"Return OP's precedence for reducing when inserting into the stack.
|
|
Defaults to 1."
|
|
(or (nth 4 op) 1))
|
|
|
|
(defun calculator-add-operators (more-ops)
|
|
"This function handles operator addition.
|
|
Adds MORE-OPS to `calculator-operator', called initially to handle
|
|
`calculator-initial-operators' and `calculator-user-operators'."
|
|
(let ((added-ops nil))
|
|
(while more-ops
|
|
(or (eq (car (car more-ops)) 'nobind)
|
|
(let ((i -1) (key (car (car more-ops))))
|
|
;; make sure the key is undefined, so it's easy to define
|
|
;; prefix keys
|
|
(while (< (setq i (1+ i)) (length key))
|
|
(or (keymapp
|
|
(lookup-key calculator-mode-map
|
|
(substring key 0 (1+ i))))
|
|
(progn
|
|
(define-key
|
|
calculator-mode-map (substring key 0 (1+ i)) nil)
|
|
(setq i (length key)))))
|
|
(define-key calculator-mode-map key 'calculator-op)))
|
|
(setq added-ops (cons (if (eq (car (car more-ops)) 'nobind)
|
|
(cdr (car more-ops))
|
|
(car more-ops))
|
|
added-ops))
|
|
(setq more-ops (cdr more-ops)))
|
|
;; added-ops come first, but in correct order
|
|
(setq calculator-operators
|
|
(append (nreverse added-ops) calculator-operators))))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Display stuff
|
|
|
|
(defun calculator-reset ()
|
|
"Reset calculator variables."
|
|
(or calculator-restart-other-mode
|
|
(setq calculator-stack nil
|
|
calculator-curnum nil
|
|
calculator-stack-display nil
|
|
calculator-display-fragile nil))
|
|
(setq calculator-restart-other-mode nil)
|
|
(calculator-update-display))
|
|
|
|
(defun calculator-get-prompt ()
|
|
"Return a string to display.
|
|
The string is set not to exceed the screen width."
|
|
(let* ((calculator-prompt
|
|
(format calculator-prompt
|
|
(cond
|
|
((or calculator-output-radix calculator-input-radix)
|
|
(if (eq calculator-output-radix
|
|
calculator-input-radix)
|
|
(concat
|
|
(char-to-string
|
|
(car (rassq calculator-output-radix
|
|
calculator-char-radix)))
|
|
"=")
|
|
(concat
|
|
(if calculator-input-radix
|
|
(char-to-string
|
|
(car (rassq calculator-input-radix
|
|
calculator-char-radix)))
|
|
"=")
|
|
(char-to-string
|
|
(car (rassq calculator-output-radix
|
|
calculator-char-radix))))))
|
|
(calculator-deg "D=")
|
|
(t "=="))))
|
|
(prompt
|
|
(concat calculator-prompt
|
|
(cdr calculator-stack-display)
|
|
(cond (calculator-curnum
|
|
;; number being typed
|
|
(concat calculator-curnum "_"))
|
|
((and (= 1 (length calculator-stack))
|
|
calculator-display-fragile)
|
|
;; only the result is shown, next number will
|
|
;; restart
|
|
nil)
|
|
(t
|
|
;; waiting for a number or an operator
|
|
"?"))))
|
|
(trim (- (length prompt) (1- (window-width)))))
|
|
(if (<= trim 0)
|
|
prompt
|
|
(concat calculator-prompt
|
|
(substring prompt (+ trim (length calculator-prompt)))))))
|
|
|
|
(defun calculator-string-to-number (str)
|
|
"Convert the given STR to a number, according to the value of
|
|
`calculator-input-radix'."
|
|
(if calculator-input-radix
|
|
(let ((radix
|
|
(cdr (assq calculator-input-radix
|
|
'((bin . 2) (oct . 8) (hex . 16)))))
|
|
(i -1) (value 0) (new-value 0))
|
|
;; assume mostly valid input (e.g., characters in range)
|
|
(while (< (setq i (1+ i)) (length str))
|
|
(setq new-value
|
|
(let* ((ch (upcase (aref str i)))
|
|
(n (cond ((< ch ?0) nil)
|
|
((<= ch ?9) (- ch ?0))
|
|
((< ch ?A) nil)
|
|
((<= ch ?Z) (- ch (- ?A 10)))
|
|
(t nil))))
|
|
(if (and n (<= 0 n) (< n radix))
|
|
(+ n (* radix value))
|
|
(progn
|
|
(calculator-message
|
|
"Warning: Ignoring bad input character `%c'." ch)
|
|
(sit-for 1)
|
|
value))))
|
|
(if (if (< new-value 0) (> value 0) (< value 0))
|
|
(calculator-message "Warning: Overflow in input."))
|
|
(setq value new-value))
|
|
value)
|
|
(car (read-from-string
|
|
(cond ((equal "." str) "0.0")
|
|
((string-match "[eE][+-]?$" str) (concat str "0"))
|
|
((string-match "\\.[0-9]\\|[eE]" str) str)
|
|
((string-match "\\." str)
|
|
;; do this because Emacs reads "23." as an integer
|
|
(concat str "0"))
|
|
((stringp str) (concat str ".0"))
|
|
(t "0.0"))))))
|
|
|
|
(defun calculator-curnum-value ()
|
|
"Get the numeric value of the displayed number string as a float."
|
|
(calculator-string-to-number calculator-curnum))
|
|
|
|
(defun calculator-rotate-displayer (&optional new-disp)
|
|
"Switch to the next displayer on the `calculator-displayers' list.
|
|
Can be called with an optional argument NEW-DISP to force rotation to
|
|
that argument.
|
|
If radix output mode is active, toggle digit grouping."
|
|
(interactive)
|
|
(cond
|
|
(calculator-output-radix
|
|
(setq calculator-radix-grouping-mode
|
|
(not calculator-radix-grouping-mode))
|
|
(calculator-message
|
|
"Digit grouping mode %s."
|
|
(if calculator-radix-grouping-mode "ON" "OFF")))
|
|
(t
|
|
(setq calculator-displayers
|
|
(if (and new-disp (memq new-disp calculator-displayers))
|
|
(let ((tmp nil))
|
|
(while (not (eq (car calculator-displayers) new-disp))
|
|
(setq tmp (cons (car calculator-displayers) tmp))
|
|
(setq calculator-displayers
|
|
(cdr calculator-displayers)))
|
|
(setq calculator-displayers
|
|
(nconc calculator-displayers (nreverse tmp))))
|
|
(nconc (cdr calculator-displayers)
|
|
(list (car calculator-displayers)))))
|
|
(calculator-message
|
|
"Using %s." (cadr (car calculator-displayers)))))
|
|
(calculator-enter))
|
|
|
|
(defun calculator-rotate-displayer-back ()
|
|
"Like `calculator-rotate-displayer', but rotates modes back.
|
|
If radix output mode is active, toggle digit grouping."
|
|
(interactive)
|
|
(calculator-rotate-displayer (car (last calculator-displayers))))
|
|
|
|
(defun calculator-displayer-prev ()
|
|
"Send the current displayer function a 'left argument.
|
|
This is used to modify display arguments (if the current displayer
|
|
function supports this).
|
|
If radix output mode is active, increase the grouping size."
|
|
(interactive)
|
|
(if calculator-output-radix
|
|
(progn (setq calculator-radix-grouping-digits
|
|
(1+ calculator-radix-grouping-digits))
|
|
(calculator-enter))
|
|
(and (car calculator-displayers)
|
|
(let ((disp (caar calculator-displayers)))
|
|
(cond
|
|
((symbolp disp) (funcall disp 'left))
|
|
((and (consp disp) (eq 'std (car disp)))
|
|
(calculator-standard-displayer 'left (cadr disp))))))))
|
|
|
|
(defun calculator-displayer-next ()
|
|
"Send the current displayer function a 'right argument.
|
|
This is used to modify display arguments (if the current displayer
|
|
function supports this).
|
|
If radix output mode is active, decrease the grouping size."
|
|
(interactive)
|
|
(if calculator-output-radix
|
|
(progn (setq calculator-radix-grouping-digits
|
|
(max 2 (1- calculator-radix-grouping-digits)))
|
|
(calculator-enter))
|
|
(and (car calculator-displayers)
|
|
(let ((disp (caar calculator-displayers)))
|
|
(cond
|
|
((symbolp disp) (funcall disp 'right))
|
|
((and (consp disp) (eq 'std (car disp)))
|
|
(calculator-standard-displayer 'right (cadr disp))))))))
|
|
|
|
(defun calculator-remove-zeros (numstr)
|
|
"Get a number string NUMSTR and remove unnecessary zeroes.
|
|
the behavior of this function is controlled by
|
|
`calculator-remove-zeros'."
|
|
(cond ((and (eq calculator-remove-zeros t)
|
|
(string-match "\\.0+\\([eE][+-]?[0-9]*\\)?$" numstr))
|
|
;; remove all redundant zeros leaving an integer
|
|
(if (match-beginning 1)
|
|
(concat (substring numstr 0 (match-beginning 0))
|
|
(match-string 1 numstr))
|
|
(substring numstr 0 (match-beginning 0))))
|
|
((and calculator-remove-zeros
|
|
(string-match
|
|
"\\..\\([0-9]*[1-9]\\)?\\(0+\\)\\([eE][+-]?[0-9]*\\)?$"
|
|
numstr))
|
|
;; remove zeros, except for first after the "."
|
|
(if (match-beginning 3)
|
|
(concat (substring numstr 0 (match-beginning 2))
|
|
(match-string 3 numstr))
|
|
(substring numstr 0 (match-beginning 2))))
|
|
(t numstr)))
|
|
|
|
(defun calculator-standard-displayer (num char)
|
|
"Standard display function, used to display NUM.
|
|
Its behavior is determined by `calculator-number-digits' and the given
|
|
CHAR argument (both will be used to compose a format string). If the
|
|
char is \"n\" then this function will choose one between %f or %e, this
|
|
is a work around %g jumping to exponential notation too fast.
|
|
|
|
The special 'left and 'right symbols will make it change the current
|
|
number of digits displayed (`calculator-number-digits').
|
|
|
|
It will also remove redundant zeros from the result."
|
|
(if (symbolp num)
|
|
(cond ((eq num 'left)
|
|
(and (> calculator-number-digits 0)
|
|
(setq calculator-number-digits
|
|
(1- calculator-number-digits))
|
|
(calculator-enter)))
|
|
((eq num 'right)
|
|
(setq calculator-number-digits
|
|
(1+ calculator-number-digits))
|
|
(calculator-enter)))
|
|
(let ((str (if (zerop num)
|
|
"0"
|
|
(format
|
|
(concat "%."
|
|
(number-to-string calculator-number-digits)
|
|
(if (eq char ?n)
|
|
(let ((n (abs num)))
|
|
(if (or (< n 0.001) (> n 1e8)) "e" "f"))
|
|
(string char)))
|
|
num))))
|
|
(calculator-remove-zeros str))))
|
|
|
|
(defun calculator-eng-display (num)
|
|
"Display NUM in engineering notation.
|
|
The number of decimal digits used is controlled by
|
|
`calculator-number-digits', so to change it at runtime you have to use
|
|
the 'left or 'right when one of the standard modes is used."
|
|
(if (symbolp num)
|
|
(cond ((eq num 'left)
|
|
(setq calculator-eng-extra
|
|
(if calculator-eng-extra
|
|
(1+ calculator-eng-extra)
|
|
1))
|
|
(let ((calculator-eng-tmp-show t)) (calculator-enter)))
|
|
((eq num 'right)
|
|
(setq calculator-eng-extra
|
|
(if calculator-eng-extra
|
|
(1- calculator-eng-extra)
|
|
-1))
|
|
(let ((calculator-eng-tmp-show t)) (calculator-enter))))
|
|
(let ((exp 0))
|
|
(and (not (= 0 num))
|
|
(progn
|
|
(while (< (abs num) 1.0)
|
|
(setq num (* num 1000.0)) (setq exp (- exp 3)))
|
|
(while (> (abs num) 999.0)
|
|
(setq num (/ num 1000.0)) (setq exp (+ exp 3)))
|
|
(and calculator-eng-tmp-show
|
|
(not (= 0 calculator-eng-extra))
|
|
(let ((i calculator-eng-extra))
|
|
(while (> i 0)
|
|
(setq num (* num 1000.0)) (setq exp (- exp 3))
|
|
(setq i (1- i)))
|
|
(while (< i 0)
|
|
(setq num (/ num 1000.0)) (setq exp (+ exp 3))
|
|
(setq i (1+ i)))))))
|
|
(or calculator-eng-tmp-show (setq calculator-eng-extra nil))
|
|
(let ((str (format (concat "%." (number-to-string
|
|
calculator-number-digits)
|
|
"f")
|
|
num)))
|
|
(concat (let ((calculator-remove-zeros
|
|
;; make sure we don't leave integers
|
|
(and calculator-remove-zeros 'x)))
|
|
(calculator-remove-zeros str))
|
|
"e" (number-to-string exp))))))
|
|
|
|
(defun calculator-number-to-string (num)
|
|
"Convert NUM to a displayable string."
|
|
(cond
|
|
((and (numberp num) calculator-output-radix)
|
|
;; print with radix - for binary I convert the octal number
|
|
(let ((str (format (if (eq calculator-output-radix 'hex) "%x" "%o")
|
|
(calculator-truncate
|
|
(if calculator-2s-complement num (abs num))))))
|
|
(if (eq calculator-output-radix 'bin)
|
|
(let ((i -1) (s ""))
|
|
(while (< (setq i (1+ i)) (length str))
|
|
(setq s
|
|
(concat s
|
|
(cdr (assq (aref str i)
|
|
'((?0 . "000") (?1 . "001")
|
|
(?2 . "010") (?3 . "011")
|
|
(?4 . "100") (?5 . "101")
|
|
(?6 . "110") (?7 . "111")))))))
|
|
(string-match "^0*\\(.+\\)" s)
|
|
(setq str (match-string 1 s))))
|
|
(if calculator-radix-grouping-mode
|
|
(let ((d (/ (length str) calculator-radix-grouping-digits))
|
|
(r (% (length str) calculator-radix-grouping-digits)))
|
|
(while (>= (setq d (1- d)) (if (zerop r) 1 0))
|
|
(let ((i (+ r (* d calculator-radix-grouping-digits))))
|
|
(setq str (concat (substring str 0 i)
|
|
calculator-radix-grouping-separator
|
|
(substring str i)))))))
|
|
(upcase
|
|
(if (and (not calculator-2s-complement) (< num 0))
|
|
(concat "-" str)
|
|
str))))
|
|
((and (numberp num) calculator-displayer)
|
|
(cond
|
|
((stringp calculator-displayer)
|
|
(format calculator-displayer num))
|
|
((symbolp calculator-displayer)
|
|
(funcall calculator-displayer num))
|
|
((and (consp calculator-displayer)
|
|
(eq 'std (car calculator-displayer)))
|
|
(calculator-standard-displayer num (cadr calculator-displayer)))
|
|
((listp calculator-displayer)
|
|
(eval calculator-displayer))
|
|
(t (prin1-to-string num t))))
|
|
;; operators are printed here
|
|
(t (prin1-to-string (nth 1 num) t))))
|
|
|
|
(defun calculator-update-display (&optional force)
|
|
"Update the display.
|
|
If optional argument FORCE is non-nil, don't use the cached string."
|
|
(set-buffer calculator-buffer)
|
|
;; update calculator-stack-display
|
|
(if (or force
|
|
(not (eq (car calculator-stack-display) calculator-stack)))
|
|
(setq calculator-stack-display
|
|
(cons calculator-stack
|
|
(if calculator-stack
|
|
(concat
|
|
(let ((calculator-displayer
|
|
(if (and calculator-displayers
|
|
(= 1 (length calculator-stack)))
|
|
;; customizable display for a single value
|
|
(caar calculator-displayers)
|
|
calculator-displayer)))
|
|
(mapconcat 'calculator-number-to-string
|
|
(reverse calculator-stack)
|
|
" "))
|
|
" "
|
|
(and calculator-display-fragile
|
|
calculator-saved-list
|
|
(= (car calculator-stack)
|
|
(nth calculator-saved-ptr
|
|
calculator-saved-list))
|
|
(if (= 0 calculator-saved-ptr)
|
|
(format "[%s]" (length calculator-saved-list))
|
|
(format "[%s/%s]"
|
|
(- (length calculator-saved-list)
|
|
calculator-saved-ptr)
|
|
(length calculator-saved-list)))))
|
|
""))))
|
|
(let ((inhibit-read-only t))
|
|
(erase-buffer)
|
|
(insert (calculator-get-prompt)))
|
|
(set-buffer-modified-p nil)
|
|
(if calculator-display-fragile
|
|
(goto-char (1+ (length calculator-prompt)))
|
|
(goto-char (1- (point)))))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Stack computations
|
|
|
|
(defun calculator-reduce-stack (prec)
|
|
"Reduce the stack using top operator.
|
|
PREC is a precedence - reduce everything with higher precedence."
|
|
(while
|
|
(cond
|
|
((and (cdr (cdr calculator-stack)) ; have three values
|
|
(consp (nth 0 calculator-stack)) ; two operators & num
|
|
(numberp (nth 1 calculator-stack))
|
|
(consp (nth 2 calculator-stack))
|
|
(eq '\) (nth 1 (nth 0 calculator-stack)))
|
|
(eq '\( (nth 1 (nth 2 calculator-stack))))
|
|
;; reduce "... ( x )" --> "... x"
|
|
(setq calculator-stack
|
|
(cons (nth 1 calculator-stack)
|
|
(nthcdr 3 calculator-stack)))
|
|
;; another iteration
|
|
t)
|
|
((and (cdr (cdr calculator-stack)) ; have three values
|
|
(numberp (nth 0 calculator-stack)) ; two nums & operator
|
|
(consp (nth 1 calculator-stack))
|
|
(numberp (nth 2 calculator-stack))
|
|
(= 2 (calculator-op-arity ; binary operator
|
|
(nth 1 calculator-stack)))
|
|
(<= prec ; with higher prec.
|
|
(calculator-op-prec (nth 1 calculator-stack))))
|
|
;; reduce "... x op y" --> "... r", r is the result
|
|
(setq calculator-stack
|
|
(cons (calculator-funcall
|
|
(nth 2 (nth 1 calculator-stack))
|
|
(nth 2 calculator-stack)
|
|
(nth 0 calculator-stack))
|
|
(nthcdr 3 calculator-stack)))
|
|
;; another iteration
|
|
t)
|
|
((and (>= (length calculator-stack) 2) ; have two values
|
|
(numberp (nth 0 calculator-stack)) ; number & operator
|
|
(consp (nth 1 calculator-stack))
|
|
(= -1 (calculator-op-arity ; prefix-unary op
|
|
(nth 1 calculator-stack)))
|
|
(<= prec ; with higher prec.
|
|
(calculator-op-prec (nth 1 calculator-stack))))
|
|
;; reduce "... op x" --> "... r" for prefix op
|
|
(setq calculator-stack
|
|
(cons (calculator-funcall
|
|
(nth 2 (nth 1 calculator-stack))
|
|
(nth 0 calculator-stack))
|
|
(nthcdr 2 calculator-stack)))
|
|
;; another iteration
|
|
t)
|
|
((and (cdr calculator-stack) ; have two values
|
|
(consp (nth 0 calculator-stack)) ; operator & number
|
|
(numberp (nth 1 calculator-stack))
|
|
(= +1 (calculator-op-arity ; postfix-unary op
|
|
(nth 0 calculator-stack)))
|
|
(<= prec ; with higher prec.
|
|
(calculator-op-prec (nth 0 calculator-stack))))
|
|
;; reduce "... x op" --> "... r" for postfix op
|
|
(setq calculator-stack
|
|
(cons (calculator-funcall
|
|
(nth 2 (nth 0 calculator-stack))
|
|
(nth 1 calculator-stack))
|
|
(nthcdr 2 calculator-stack)))
|
|
;; another iteration
|
|
t)
|
|
((and calculator-stack ; have one value
|
|
(consp (nth 0 calculator-stack)) ; an operator
|
|
(= 0 (calculator-op-arity ; 0-ary op
|
|
(nth 0 calculator-stack))))
|
|
;; reduce "... op" --> "... r" for 0-ary op
|
|
(setq calculator-stack
|
|
(cons (calculator-funcall
|
|
(nth 2 (nth 0 calculator-stack)))
|
|
(nthcdr 1 calculator-stack)))
|
|
;; another iteration
|
|
t)
|
|
((and (cdr calculator-stack) ; have two values
|
|
(numberp (nth 0 calculator-stack)) ; both numbers
|
|
(numberp (nth 1 calculator-stack)))
|
|
;; get rid of redundant numbers:
|
|
;; reduce "... y x" --> "... x"
|
|
;; needed for 0-ary ops that puts more values
|
|
(setcdr calculator-stack (cdr (cdr calculator-stack))))
|
|
(t ;; no more iterations
|
|
nil))))
|
|
|
|
(defun calculator-funcall (f &optional X Y)
|
|
"If F is a symbol, evaluate (F X Y).
|
|
Otherwise, it should be a list, evaluate it with X, Y bound to the
|
|
arguments."
|
|
;; remember binary ops for calculator-repR/L
|
|
(if Y (setq calculator-last-opXY (list f X Y)))
|
|
(condition-case nil
|
|
;; there used to be code here that returns 0 if the result was
|
|
;; smaller than calculator-epsilon (1e-15). I don't think this is
|
|
;; necessary now.
|
|
(if (symbolp f)
|
|
(cond ((and X Y) (funcall f X Y))
|
|
(X (funcall f X))
|
|
(t (funcall f)))
|
|
;; f is an expression
|
|
(let* ((__f__ f) ; so we can get this value below...
|
|
(TX (calculator-truncate X))
|
|
(TY (and Y (calculator-truncate Y)))
|
|
(DX (if calculator-deg (/ (* X pi) 180) X))
|
|
(L calculator-saved-list)
|
|
(Fbound (fboundp 'F))
|
|
(Fsave (and Fbound (symbol-function 'F)))
|
|
(Dbound (fboundp 'D))
|
|
(Dsave (and Dbound (symbol-function 'D))))
|
|
;; a shortened version of flet
|
|
(fset 'F (function
|
|
(lambda (&optional x y)
|
|
(calculator-funcall __f__ x y))))
|
|
(fset 'D (function
|
|
(lambda (x)
|
|
(if calculator-deg (/ (* x 180) pi) x))))
|
|
(unwind-protect (eval f)
|
|
(if Fbound (fset 'F Fsave) (fmakunbound 'F))
|
|
(if Dbound (fset 'D Dsave) (fmakunbound 'D)))))
|
|
(error 0)))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Input interaction
|
|
|
|
(defun calculator-last-input (&optional keys)
|
|
"Last char (or event or event sequence) that was read.
|
|
Optional string argument KEYS will force using it as the keys entered."
|
|
(let ((inp (or keys (this-command-keys))))
|
|
(if (or (stringp inp) (not (arrayp inp)))
|
|
inp
|
|
;; this translates kp-x to x and [tries to] create a string to
|
|
;; lookup operators
|
|
(let* ((i -1) (converted-str (make-string (length inp) ? )) k)
|
|
;; converts an array to a string the ops lookup with keypad
|
|
;; input
|
|
(while (< (setq i (1+ i)) (length inp))
|
|
(setq k (aref inp i))
|
|
;; if Emacs will someday have a event-key, then this would
|
|
;; probably be modified anyway
|
|
(and (if (fboundp 'key-press-event-p) (key-press-event-p k))
|
|
(if (fboundp 'event-key)
|
|
(and (event-key k) (setq k (event-key k)))))
|
|
;; assume all symbols are translatable with an ascii-character
|
|
(and (symbolp k)
|
|
(setq k (or (get k 'ascii-character) ? )))
|
|
(aset converted-str i k))
|
|
converted-str))))
|
|
|
|
(defun calculator-clear-fragile (&optional op)
|
|
"Clear the fragile flag if it was set, then maybe reset all.
|
|
OP is the operator (if any) that caused this call."
|
|
(if (and calculator-display-fragile
|
|
(or (not op)
|
|
(= -1 (calculator-op-arity op))
|
|
(= 0 (calculator-op-arity op))))
|
|
;; reset if last calc finished, and now get a num or prefix or 0-ary
|
|
;; op
|
|
(calculator-reset))
|
|
(setq calculator-display-fragile nil))
|
|
|
|
(defun calculator-digit ()
|
|
"Enter a single digit."
|
|
(interactive)
|
|
(let ((inp (aref (calculator-last-input) 0)))
|
|
(if (and (or calculator-display-fragile
|
|
(not (numberp (car calculator-stack))))
|
|
(cond
|
|
((not calculator-input-radix) (<= inp ?9))
|
|
((eq calculator-input-radix 'bin) (<= inp ?1))
|
|
((eq calculator-input-radix 'oct) (<= inp ?7))
|
|
(t t)))
|
|
;; enter digit if starting a new computation or have an op on the
|
|
;; stack
|
|
(progn
|
|
(calculator-clear-fragile)
|
|
(let ((digit (upcase (char-to-string inp))))
|
|
(if (equal calculator-curnum "0")
|
|
(setq calculator-curnum nil))
|
|
(setq calculator-curnum
|
|
(concat (or calculator-curnum "") digit)))
|
|
(calculator-update-display)))))
|
|
|
|
(defun calculator-decimal ()
|
|
"Enter a decimal period."
|
|
(interactive)
|
|
(if (and (not calculator-input-radix)
|
|
(or calculator-display-fragile
|
|
(not (numberp (car calculator-stack))))
|
|
(not (and calculator-curnum
|
|
(string-match "[.eE]" calculator-curnum))))
|
|
;; enter the period on the same condition as a digit, only if no
|
|
;; period or exponent entered yet
|
|
(progn
|
|
(calculator-clear-fragile)
|
|
(setq calculator-curnum (concat (or calculator-curnum "0") "."))
|
|
(calculator-update-display))))
|
|
|
|
(defun calculator-exp ()
|
|
"Enter an `E' exponent character, or a digit in hex input mode."
|
|
(interactive)
|
|
(if calculator-input-radix
|
|
(calculator-digit)
|
|
(if (and (or calculator-display-fragile
|
|
(not (numberp (car calculator-stack))))
|
|
(not (and calculator-curnum
|
|
(string-match "[eE]" calculator-curnum))))
|
|
;; same condition as above, also no E so far
|
|
(progn
|
|
(calculator-clear-fragile)
|
|
(setq calculator-curnum (concat (or calculator-curnum "1") "e"))
|
|
(calculator-update-display)))))
|
|
|
|
(defun calculator-op (&optional keys)
|
|
"Enter an operator on the stack, doing all necessary reductions.
|
|
Optional string argument KEYS will force using it as the keys entered."
|
|
(interactive)
|
|
(catch 'op-error
|
|
(let* ((last-inp (calculator-last-input keys))
|
|
(op (assoc last-inp calculator-operators)))
|
|
(calculator-clear-fragile op)
|
|
(if (and calculator-curnum (/= (calculator-op-arity op) 0))
|
|
(setq calculator-stack
|
|
(cons (calculator-curnum-value) calculator-stack)))
|
|
(setq calculator-curnum nil)
|
|
(if (and (= 2 (calculator-op-arity op))
|
|
(not (and calculator-stack
|
|
(numberp (nth 0 calculator-stack)))))
|
|
;; we have a binary operator but no number - search for a prefix
|
|
;; version
|
|
(let ((rest-ops calculator-operators))
|
|
(while (not (equal last-inp (car (car rest-ops))))
|
|
(setq rest-ops (cdr rest-ops)))
|
|
(setq op (assoc last-inp (cdr rest-ops)))
|
|
(if (not (and op (= -1 (calculator-op-arity op))))
|
|
;;(error "Binary operator without a first operand")
|
|
(progn
|
|
(calculator-message
|
|
"Binary operator without a first operand")
|
|
(throw 'op-error nil)))))
|
|
(calculator-reduce-stack
|
|
(cond ((eq (nth 1 op) '\() 10)
|
|
((eq (nth 1 op) '\)) 0)
|
|
(t (calculator-op-prec op))))
|
|
(if (or (and (= -1 (calculator-op-arity op))
|
|
(numberp (car calculator-stack)))
|
|
(and (/= (calculator-op-arity op) -1)
|
|
(/= (calculator-op-arity op) 0)
|
|
(not (numberp (car calculator-stack)))))
|
|
;;(error "Unterminated expression")
|
|
(progn
|
|
(calculator-message "Unterminated expression")
|
|
(throw 'op-error nil)))
|
|
(setq calculator-stack (cons op calculator-stack))
|
|
(calculator-reduce-stack (calculator-op-prec op))
|
|
(and (= (length calculator-stack) 1)
|
|
(numberp (nth 0 calculator-stack))
|
|
;; the display is fragile if it contains only one number
|
|
(setq calculator-display-fragile t)
|
|
;; add number to the saved-list
|
|
calculator-add-saved
|
|
(if (= 0 calculator-saved-ptr)
|
|
(setq calculator-saved-list
|
|
(cons (car calculator-stack) calculator-saved-list))
|
|
(let ((p (nthcdr (1- calculator-saved-ptr)
|
|
calculator-saved-list)))
|
|
(setcdr p (cons (car calculator-stack) (cdr p))))))
|
|
(calculator-update-display))))
|
|
|
|
(defun calculator-op-or-exp ()
|
|
"Either enter an operator or a digit.
|
|
Used with +/- for entering them as digits in numbers like 1e-3 (there is
|
|
no need for negative numbers since these are handled by unary
|
|
operators)."
|
|
(interactive)
|
|
(if (and (not calculator-display-fragile)
|
|
calculator-curnum
|
|
(string-match "[eE]$" calculator-curnum))
|
|
(calculator-digit)
|
|
(calculator-op)))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Input/output modes (not display)
|
|
|
|
(defun calculator-dec/deg-mode ()
|
|
"Set decimal mode for display & input, if decimal, toggle deg mode."
|
|
(interactive)
|
|
(if calculator-curnum
|
|
(setq calculator-stack
|
|
(cons (calculator-curnum-value) calculator-stack)))
|
|
(setq calculator-curnum nil)
|
|
(if (or calculator-input-radix calculator-output-radix)
|
|
(progn (setq calculator-input-radix nil)
|
|
(setq calculator-output-radix nil))
|
|
;; already decimal - toggle degrees mode
|
|
(setq calculator-deg (not calculator-deg)))
|
|
(calculator-update-display t))
|
|
|
|
(defun calculator-radix-mode (&optional keys)
|
|
"Set input and display radix modes.
|
|
Optional string argument KEYS will force using it as the keys entered."
|
|
(interactive)
|
|
(calculator-radix-input-mode keys)
|
|
(calculator-radix-output-mode keys))
|
|
|
|
(defun calculator-radix-input-mode (&optional keys)
|
|
"Set input radix modes.
|
|
Optional string argument KEYS will force using it as the keys entered."
|
|
(interactive)
|
|
(if calculator-curnum
|
|
(setq calculator-stack
|
|
(cons (calculator-curnum-value) calculator-stack)))
|
|
(setq calculator-curnum nil)
|
|
(setq calculator-input-radix
|
|
(let ((inp (calculator-last-input keys)))
|
|
(cdr (assq (upcase (aref inp (1- (length inp))))
|
|
calculator-char-radix))))
|
|
(calculator-update-display))
|
|
|
|
(defun calculator-radix-output-mode (&optional keys)
|
|
"Set display radix modes.
|
|
Optional string argument KEYS will force using it as the keys entered."
|
|
(interactive)
|
|
(if calculator-curnum
|
|
(setq calculator-stack
|
|
(cons (calculator-curnum-value) calculator-stack)))
|
|
(setq calculator-curnum nil)
|
|
(setq calculator-output-radix
|
|
(let ((inp (calculator-last-input keys)))
|
|
(cdr (assq (upcase (aref inp (1- (length inp))))
|
|
calculator-char-radix))))
|
|
(calculator-update-display t))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Saved values list
|
|
|
|
(defun calculator-save-on-list ()
|
|
"Evaluate current expression, put result on the saved values list."
|
|
(interactive)
|
|
(let ((calculator-add-saved t)) ; marks the result to be added
|
|
(calculator-enter)))
|
|
|
|
(defun calculator-clear-saved ()
|
|
"Clear the list of saved values in `calculator-saved-list'."
|
|
(interactive)
|
|
(setq calculator-saved-list nil)
|
|
(setq calculator-saved-ptr 0)
|
|
(calculator-update-display t))
|
|
|
|
(defun calculator-saved-move (n)
|
|
"Go N elements up the list of saved values."
|
|
(interactive)
|
|
(and calculator-saved-list
|
|
(or (null calculator-stack) calculator-display-fragile)
|
|
(progn
|
|
(setq calculator-saved-ptr
|
|
(max (min (+ n calculator-saved-ptr)
|
|
(length calculator-saved-list))
|
|
0))
|
|
(if (nth calculator-saved-ptr calculator-saved-list)
|
|
(setq calculator-stack
|
|
(list (nth calculator-saved-ptr calculator-saved-list))
|
|
calculator-display-fragile t)
|
|
(calculator-reset))
|
|
(calculator-update-display))))
|
|
|
|
(defun calculator-saved-up ()
|
|
"Go up the list of saved values."
|
|
(interactive)
|
|
(calculator-saved-move +1))
|
|
|
|
(defun calculator-saved-down ()
|
|
"Go down the list of saved values."
|
|
(interactive)
|
|
(calculator-saved-move -1))
|
|
|
|
;;;---------------------------------------------------------------------
|
|
;;; Misc functions
|
|
|
|
(defun calculator-open-paren ()
|
|
"Equivalents of `(' use this."
|
|
(interactive)
|
|
(calculator-op "("))
|
|
|
|
(defun calculator-close-paren ()
|
|
"Equivalents of `)' use this."
|
|
(interactive)
|
|
(calculator-op ")"))
|
|
|
|
(defun calculator-enter ()
|
|
"Evaluate current expression."
|
|
(interactive)
|
|
(calculator-op "="))
|
|
|
|
(defun calculator-backspace ()
|
|
"Backward delete a single digit or a stack element."
|
|
(interactive)
|
|
(if calculator-curnum
|
|
(setq calculator-curnum
|
|
(if (> (length calculator-curnum) 1)
|
|
(substring calculator-curnum
|
|
0 (1- (length calculator-curnum)))
|
|
nil))
|
|
(setq calculator-stack (cdr calculator-stack)))
|
|
(calculator-update-display))
|
|
|
|
(defun calculator-clear ()
|
|
"Clear current number."
|
|
(interactive)
|
|
(setq calculator-curnum nil)
|
|
(cond
|
|
;; if the current number is from the saved-list - remove it
|
|
((and calculator-display-fragile
|
|
calculator-saved-list
|
|
(= (car calculator-stack)
|
|
(nth calculator-saved-ptr calculator-saved-list)))
|
|
(if (= 0 calculator-saved-ptr)
|
|
(setq calculator-saved-list (cdr calculator-saved-list))
|
|
(let ((p (nthcdr (1- calculator-saved-ptr)
|
|
calculator-saved-list)))
|
|
(setcdr p (cdr (cdr p)))
|
|
(setq calculator-saved-ptr (1- calculator-saved-ptr))))
|
|
(if calculator-saved-list
|
|
(setq calculator-stack
|
|
(list (nth calculator-saved-ptr calculator-saved-list)))
|
|
(calculator-reset)))
|
|
;; reset if fragile or double clear
|
|
((or calculator-display-fragile (eq last-command this-command))
|
|
(calculator-reset)))
|
|
(calculator-update-display))
|
|
|
|
(defun calculator-copy ()
|
|
"Copy current number to the `kill-ring'."
|
|
(interactive)
|
|
(let ((calculator-displayer
|
|
(or calculator-copy-displayer calculator-displayer))
|
|
(calculator-displayers
|
|
(if calculator-copy-displayer nil calculator-displayers)))
|
|
(calculator-enter)
|
|
;; remove trailing spaces and an index
|
|
(let ((s (cdr calculator-stack-display)))
|
|
(and s
|
|
(if (string-match "^\\([^ ]+\\) *\\(\\[[0-9/]+\\]\\)? *$" s)
|
|
(setq s (match-string 1 s)))
|
|
(kill-new s)))))
|
|
|
|
(defun calculator-set-register (reg)
|
|
"Set a register value for REG."
|
|
(interactive "cRegister to store into: ")
|
|
(let* ((as (assq reg calculator-registers))
|
|
(val (progn (calculator-enter) (car calculator-stack))))
|
|
(if as
|
|
(setcdr as val)
|
|
(setq calculator-registers
|
|
(cons (cons reg val) calculator-registers)))
|
|
(calculator-message "[%c] := %S" reg val)))
|
|
|
|
(defun calculator-put-value (val)
|
|
"Paste VAL as if entered.
|
|
Used by `calculator-paste' and `get-register'."
|
|
(if (and (numberp val)
|
|
;; (not calculator-curnum)
|
|
(or calculator-display-fragile
|
|
(not (numberp (car calculator-stack)))))
|
|
(progn
|
|
(calculator-clear-fragile)
|
|
(setq calculator-curnum (let ((calculator-displayer "%S"))
|
|
(calculator-number-to-string val)))
|
|
(calculator-update-display))))
|
|
|
|
(defun calculator-paste ()
|
|
"Paste a value from the `kill-ring'."
|
|
(interactive)
|
|
(calculator-put-value
|
|
(let ((str (replace-regexp-in-string
|
|
"^ *\\(.+[^ ]\\) *$" "\\1" (current-kill 0))))
|
|
(and (not calculator-input-radix)
|
|
calculator-paste-decimals
|
|
(string-match "\\([0-9]+\\)\\(\\.[0-9]+\\)?\\(e[0-9]+\\)?"
|
|
str)
|
|
(or (match-string 1 str)
|
|
(match-string 2 str)
|
|
(match-string 3 str))
|
|
(setq str (concat (or (match-string 1 str) "0")
|
|
(or (match-string 2 str) ".0")
|
|
(or (match-string 3 str) ""))))
|
|
(condition-case nil (calculator-string-to-number str)
|
|
(error nil)))))
|
|
|
|
(defun calculator-get-register (reg)
|
|
"Get a value from a register REG."
|
|
(interactive "cRegister to get value from: ")
|
|
(calculator-put-value (cdr (assq reg calculator-registers))))
|
|
|
|
(defun calculator-help ()
|
|
;; this is used as the quick reference screen you get with `h'
|
|
"Quick reference:
|
|
* numbers/operators/parens/./e - enter expressions
|
|
+ - * / \\(div) %(rem) _(-X,postfix) ;(1/X,postfix) ^(exp) L(og)
|
|
Q(sqrt) !(fact) S(in) C(os) T(an) |(or) #(xor) &(and) ~(not)
|
|
* >/< repeats last binary operation with its 2nd (1st) arg as postfix op
|
|
* I inverses next trig function * '/\"/{} - display/display args
|
|
* D - switch to all-decimal, or toggle deg/rad mode
|
|
* B/O/H/X - binary/octal/hex mode for i/o (X is a shortcut for H)
|
|
* i/o - prefix for d/b/o/x - set only input/output modes
|
|
* enter/= - evaluate current expr. * s/g - set/get a register
|
|
* space - evaluate & save on list * l/v - list total/average
|
|
* up/down/C-p/C-n - browse saved * C-delete - clear all saved
|
|
* C-insert - copy whole expr. * C-return - evaluate, copy, exit
|
|
* insert - paste a number * backspace- delete backwards
|
|
* delete - clear argument or list value or whole expression (twice)
|
|
* escape/q - exit."
|
|
(interactive)
|
|
(if (eq last-command 'calculator-help)
|
|
(let ((mode-name "Calculator")
|
|
(major-mode 'calculator-mode)
|
|
(g-map (current-global-map))
|
|
(win (selected-window)))
|
|
(require 'ehelp)
|
|
(if calculator-electric-mode
|
|
(use-global-map calculator-saved-global-map))
|
|
(if (or (not calculator-electric-mode)
|
|
;; XEmacs has a problem with electric-describe-mode
|
|
(string-match "XEmacs" (emacs-version)))
|
|
(describe-mode)
|
|
(electric-describe-mode))
|
|
(if calculator-electric-mode
|
|
(use-global-map g-map))
|
|
(select-window win) ; these are for XEmacs (also below)
|
|
(message nil))
|
|
(let ((one (one-window-p t))
|
|
(win (selected-window))
|
|
(help-buf (get-buffer-create "*Help*")))
|
|
(save-window-excursion
|
|
(with-output-to-temp-buffer "*Help*"
|
|
(princ (documentation 'calculator-help)))
|
|
(if one
|
|
(shrink-window-if-larger-than-buffer
|
|
(get-buffer-window help-buf)))
|
|
(message
|
|
"`%s' again for more help, any other key continues normally."
|
|
(calculator-last-input))
|
|
(select-window win)
|
|
(sit-for 360))
|
|
(select-window win))))
|
|
|
|
(defun calculator-quit ()
|
|
"Quit calculator."
|
|
(interactive)
|
|
(set-buffer calculator-buffer)
|
|
(let ((inhibit-read-only t)) (erase-buffer))
|
|
(if (not calculator-electric-mode)
|
|
(progn
|
|
(condition-case nil
|
|
(while (get-buffer-window calculator-buffer)
|
|
(delete-window (get-buffer-window calculator-buffer)))
|
|
(error nil))
|
|
(kill-buffer calculator-buffer)))
|
|
(setq calculator-buffer nil)
|
|
(message "Calculator done.")
|
|
(if calculator-electric-mode (throw 'calculator-done nil)))
|
|
|
|
(defun calculator-save-and-quit ()
|
|
"Quit the calculator, saving the result on the `kill-ring'."
|
|
(interactive)
|
|
(calculator-enter)
|
|
(calculator-copy)
|
|
(calculator-quit))
|
|
|
|
(defun calculator-repR (x)
|
|
"Repeats the last binary operation with its second argument and X.
|
|
To use this, apply a binary operator (evaluate it), then call this."
|
|
(if calculator-last-opXY
|
|
;; avoid rebinding calculator-last-opXY
|
|
(let ((calculator-last-opXY calculator-last-opXY))
|
|
(calculator-funcall
|
|
(car calculator-last-opXY) x (nth 2 calculator-last-opXY)))
|
|
x))
|
|
|
|
(defun calculator-repL (x)
|
|
"Repeats the last binary operation with its first argument and X.
|
|
To use this, apply a binary operator (evaluate it), then call this."
|
|
(if calculator-last-opXY
|
|
;; avoid rebinding calculator-last-opXY
|
|
(let ((calculator-last-opXY calculator-last-opXY))
|
|
(calculator-funcall
|
|
(car calculator-last-opXY) (nth 1 calculator-last-opXY) x))
|
|
x))
|
|
|
|
(defun calculator-fact (x)
|
|
"Simple factorial of X."
|
|
(let ((r (if (<= x 10) 1 1.0)))
|
|
(while (> x 0)
|
|
(setq r (* r (truncate x)))
|
|
(setq x (1- x)))
|
|
(+ 0.0 r)))
|
|
|
|
(defun calculator-truncate (n)
|
|
"Truncate N, return 0 in case of overflow."
|
|
(condition-case nil (truncate n) (error 0)))
|
|
|
|
|
|
(provide 'calculator)
|
|
|
|
;;; arch-tag: a1b9766c-af8a-4a74-b466-65ad8eeb0c73
|
|
;;; calculator.el ends here
|