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number.cls
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#!/usr/bin/env rexx
/* ---------------------------------------------------------------- */
/* Number class, a subclass of the String class */
/* Values can be any valid number. */
/* */
/* All arithmetic methods need to be defined here, because */
/* the result of the operation should be another object of */
/* the Number class, and the result of the String class operators */
/* always is a String class object. */
/* */
/* Note that subclasses of the Number class will yield results */
/* that belong to that particular receiver subclass. */
/* */
/* NOTE: Requieres oorexx 4.0 or later */
/* ---------------------------------------------------------------- */
/* */
/* Originally by Ruurd J. Idenburg */
/* */
/* No copyright, no licence, no guarantees or warrantees, be it */
/* explicit, implicit or whatever. Usage is totally and completely */
/* at the users own risk, the author shall not be liable for any */
/* damages whatsoever, for any reason whatsoever. */
/* */
/* Please keep this comment block intact when modifying this code */
/* and add a note with date and a description. */
/* */
/* ---------------------------------------------------------------- */
/* 2020/03/05 - Initial version approximately (RJI) */
/* 2022/02/14 - Support prefix + and - using forward to super (RJI) */
/* 2022/02/15 - 'UNKNOWN method to handle all .number methods (RJI) */
/* ---------------------------------------------------------------- */
::class number public subclass string
::attribute methods class private
::attribute calculationResult private
::method activate class
-- all (hopefully) String methods that should result in .number instance
self~methods = ('+','-','/','*','%','//','**', -
abs,ceiling,floor,format,max,min,modulo,round,trunc)
-- remove them from method lookup chain, setting method objects to .nil
unknownMethods = .StringTable~new
do method over self~methods
unknownMethods[method] = .nil
end
-- make the methods unavailable so we can trap them in our UNKNOWN method
self~defineMethods(unknownMethods)
::method init
self~init:super
if (self)~datatype\='NUM' then do -- if self is not a number
raise syntax 93.904 array(1,self) -- then raise an error and quit
end
::method unknown
use arg method, args
-- if not a .String instance method return the nil object (.nil)
if ''~instanceMethod(method)~isNil then return .nil
-- pass the method and arguments to the superclass and wait for the result
forward class(super) message (method) arguments (args) continue
-- keep the result
self~calculationResult = result
-- if not an arithmetic operator/method return the result .String object
if \self~class~methods~allItems~hasItem(method) then do
return self~calculationResult
end
-- create an new .number instance as the result of the arithmetic operation
return self~class~new(self~calculationResult)
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All content © Ruurd Idenburg, 2007–2023,
except where marked otherwise. All rights reserved. This page is primarily for non-commercial use only.
The Idenburg website records no personal information and sets no ‘cookies’.
This site is hosted on a VPS(Virtual Private System) rented from Transip.nl, a Dutch company, falling under Dutch (privacy) laws (I think).
This page updated on Fri, 07 May 2021 12:15:43 +0200 by Ruurd Idenburg.
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