198 lines
5.8 KiB
Scheme
198 lines
5.8 KiB
Scheme
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;;;
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;;; Copyright (c) 1985 Massachusetts Institute of Technology
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;;;
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;;; This material was developed by the Scheme project at the
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;;; Massachusetts Institute of Technology, Department of
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;;; Electrical Engineering and Computer Science. Permission to
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;;; copy this software, to redistribute it, and to use it for any
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;;; purpose is granted, subject to the following restrictions and
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;;; understandings.
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;;;
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;;; 1. Any copy made of this software must include this copyright
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;;; notice in full.
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;;;
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;;; 2. Users of this software agree to make their best efforts (a)
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;;; to return to the MIT Scheme project any improvements or
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;;; extensions that they make, so that these may be included in
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;;; future releases; and (b) to inform MIT of noteworthy uses of
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;;; this software.
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;;;
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;;; 3. All materials developed as a consequence of the use of
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;;; this software shall duly acknowledge such use, in accordance
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;;; with the usual standards of acknowledging credit in academic
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;;; research.
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;;;
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;;; 4. MIT has made no warrantee or representation that the
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;;; operation of this software will be error-free, and MIT is
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;;; under no obligation to provide any services, by way of
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;;; maintenance, update, or otherwise.
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;;;
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;;; 5. In conjunction with products arising from the use of this
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;;; material, there shall be no use of the name of the
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;;; Massachusetts Institute of Technology nor of any adaptation
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;;; thereof in any advertising, promotional, or sales literature
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;;; without prior written consent from MIT in each case.
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;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;
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;;; Modified by Texas Instruments Inc 8/15/85
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;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;; Command Argument Reader
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;;; This code isn't packaged yet. Public definitions are marked.
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;;;; Description
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;;;
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;;; 1. The reader keeps track of:
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;;;
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;;; [] The MAGNITUDE of the argument. If there are no digits, the
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;;; magnitude is #!FALSE.
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;;; [] The SIGN of the argument.
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;;; [] The MULTIPLIER-EXPONENT, which is the number of C-U's typed.
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;;; [] Whether or not "Autoargument mode" is in effect. In autoarg
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;;; mode, ordinary digits are interpreted as part of the argument;
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;;; normally they are self-insering.
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;;;
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;;; 2. It has the following (alterable) parameters:
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;;;
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;;; [] RADIX, which is between 2 and 36 inclusive. (default: 10)
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;;; [] MULTIPLIER-BASE, a non-negative integer. (default: 4)
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;;;
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;;; 3. From these, it can compute:
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;;;
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;;; [] VALUE = (* MAGNITUDE MULTIPLIER-EXPONENT MULTIPLIER-BASE).
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;;; If the magnitude is #!FALSE, then the value is too.
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;;;; Primitives
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;; Public
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;(define (with-command-argument-reader thunk)
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;; Public
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;(define (reset-command-argument-reader!)
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;; Public
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(define (update-argument-prompt!)
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(set-command-prompt! (command-argument-prompt)))
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;; Public
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;(define (command-argument-prompt)
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;;;; Argument Number
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(define *radix*)
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;; Public
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(define (command-argument-accumulate-digit! digit-char)
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(maybe-reset-multiplier-exponent!)
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(let ((digit (or (char->digit digit-char *radix*)
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(error "Not a valid digit" digit-char))))
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(set-fluid! *magnitude*
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(if (not (fluid *magnitude*))
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digit
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(+ digit (* *radix* (fluid *magnitude*)))))))
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;; Public
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(define (set-command-argument-radix! n)
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(if (not (and (integer? n) (<= 2 n) (<= n 36)))
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(error "Radix must be an integer between 2 and 36, inclusive" n))
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(set! *radix* n))
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;; Public
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(define (command-argument-negate!)
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(maybe-reset-multiplier-exponent!)
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(set-fluid! *negative?* (not (fluid *negative?*))))
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;; Public
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;(define (command-argument-magnitude)
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;; Public
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(define (command-argument-radix)
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*radix*)
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;; Public
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;(define (command-argument-negative?)
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;; **** Kludge ****
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(set-command-argument-radix! 10)
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;;;; Argument Multiplier
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(define *multiplier-base*)
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;; Public
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(define (command-argument-increment-multiplier-exponent!)
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(set-fluid! *multiplier-exponent* (1+ (fluid *multiplier-exponent*))))
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(define (maybe-reset-multiplier-exponent!)
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(if (and (not (fluid *magnitude*))
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(= (fluid *multiplier-exponent*) 1))
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(set-fluid! *multiplier-exponent* 0)))
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;; Public
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;(define (command-argument-multiplier-exponent)
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;; Public
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;(define (command-argument-multiplier-base)
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;; Public
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(define (set-command-argument-multiplier-base! n)
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(if (not (and (integer? n) (not (negative? n))))
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(error "Multiplier Base" n "must be a non-negative integer."))
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(set! *multiplier-base* n))
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;; **** Kludge ****
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(set-command-argument-multiplier-base! 4)
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;;;; Autoargument Mode
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;; Public
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(define (enter-autoargument-mode!)
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(set-fluid! *autoargument-mode?* #!TRUE))
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;; *** Is this needed? ***
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;;(define (exit-autoargument-mode!)
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;; (set-fluid! *autoargument-mode?* #!FALSE))
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;; Public
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;(define (autoargument-mode?)
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;;;; Value
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;(define integer-expt
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;; Public
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;(define (command-argument-value)
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;; Public
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(define (command-argument-multiplier-only?)
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(and (not (fluid *magnitude*))
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(not (zero? (fluid *multiplier-exponent*)))
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(fluid *multiplier-exponent*)))
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;; Public
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(define (command-argument-negative-only?)
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(and (not (fluid *magnitude*))
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(zero? (fluid *multiplier-exponent*))
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(fluid *negative?*)))
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;; Public
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(define (command-argument-beginning?)
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(and (not (fluid *magnitude*))
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(not (fluid *negative?*))
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(< (fluid *multiplier-exponent*) 2)))
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(define (%edwin-autoargument argument)
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(let ((char (char-base (current-command-char))))
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(if (eq? char #\-)
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(if (command-argument-beginning?)
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(begin (enter-autoargument-mode!)
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(^r-negative-argument-command argument))
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(insert-chars char argument (current-point)))
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(begin (enter-autoargument-mode!)
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(^r-argument-digit-command argument)))))
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