Obelus function has been added
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@ -19,20 +19,41 @@
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*/
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package serene.simple;
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/**
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* A poor implementation of a Node number.
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*
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* Why poor?
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* first of all it allocates two types of number to hold one.
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*/
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public class NumberNode extends Node {
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private final Long value;
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private boolean isDouble = false;
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private Double doubleValue;
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private Long longValue;
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public NumberNode(Long v) {
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this.value = v;
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public NumberNode(String v) {
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if (v.contains(".")) {
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this.doubleValue = Double.parseDouble(v);
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this.isDouble = true;
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}
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else {
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this.longValue = Long.parseLong(v, 10);
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}
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}
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@Override
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public Object eval(IScope scope) {
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return this.value;
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return this.value();
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}
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@Override
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public String toString() {
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return String.format("%s", this.value);
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return String.format("%s", this.value());
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}
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private Object value() {
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if (isDouble) {
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return doubleValue;
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}
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return this.longValue;
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}
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}
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@ -138,13 +138,13 @@ public class Reader {
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ch = inputStream.read();
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while (Character.isDigit((char) ch)) {
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while (Character.isDigit((char) ch) || (char) ch == '.') {
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number = number + (char) ch;
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ch = inputStream.read();
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}
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inputStream.unread(ch);
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return new NumberNode(Long.parseLong(number, 10));
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return new NumberNode(number);
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}
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private static Node readString(PushbackReader inputStream) throws IOException {
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@ -27,6 +27,7 @@ import serene.simple.builtin.QuitFn;
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import serene.simple.builtin.PlusFn;
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import serene.simple.builtin.MinusFn;
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import serene.simple.builtin.TimesFn;
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import serene.simple.builtin.ObelusFn;
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import serene.simple.builtin.NewFn;
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public class RootScope extends AScope {
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@ -37,6 +38,7 @@ public class RootScope extends AScope {
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put("+", new PlusFn());
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put("-", new MinusFn());
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put("*", new TimesFn());
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put("/", new ObelusFn());
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put("System", System.class);
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put("Boolean", Boolean.class);
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put("String", String.class);
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@ -33,6 +33,9 @@ public class SNumber {
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public IOps multiply(Object x);
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public IOps multiply(Double x);
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public IOps multiply(Long x);
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public IOps divide(Object x);
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public IOps divide(Double x);
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public IOps divide(Long x);
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public Object value();
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}
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@ -101,6 +104,25 @@ public class SNumber {
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return y.multiply(this.v);
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}
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public IOps divide(Object x) throws SereneException {
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if (x instanceof Long) {
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return this.divide((long) x);
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}
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else if (x instanceof Double) {
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return this.divide((Double) x);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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public IOps divide(Long x) {
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return this.divide(x.doubleValue());
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}
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public IOps divide(Double x) {
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DoubleNumber y = new DoubleNumber(x);
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return y.divide(this.v);
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}
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public Object value() {
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return this.v;
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}
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@ -167,6 +189,24 @@ public class SNumber {
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return new DoubleNumber(this.v * x.doubleValue());
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}
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public IOps divide(Object x) throws SereneException {
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if (x instanceof Long) {
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return this.divide((long) x);
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}
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else if (x instanceof Double) {
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return this.divide((Double) x);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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public IOps divide(Double x) {
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return new DoubleNumber(x / this.v);
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}
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public IOps divide(Long x) {
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return new DoubleNumber(x.doubleValue() / this.v);
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}
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public Object value() {
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return this.v;
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}
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@ -0,0 +1,52 @@
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/**
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* Serene (simple) - A PoC lisp to collect data on Serenes concepts
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* Copyright (C) 2019-2020 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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package serene.simple.builtin;
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import java.util.List;
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import serene.simple.IScope;
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import serene.simple.SNumber;
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import serene.simple.SereneException;
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public class ObelusFn extends AFn {
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public String fnName() {
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return "/";
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};
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public Object eval(IScope scope) throws SereneException{
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List<Object> args = this.arguments();
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if (args.size() == 0) {
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throw new SereneException(
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"ArityError: You need 1 or more parameters for this functions.");
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}
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SNumber.IOps result = SNumber.createNumber(args.get(0));
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try {
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for(Object x: args.subList(1, args.size())) {
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result = (SNumber.IOps) result.divide(x);
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}
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}
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catch (IndexOutOfBoundsException e) {}
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return result.value();
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}
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}
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