DanilaFe/Abacus
1
0
Fork 0
mirror of https://github.com/DanilaFe/abacus synced 2026-01-10 17:25:19 +00:00
Code Issues Releases Wiki Activity

Merge branch 'master' of https://github.com/DanilaFe/abacus

Browse Source
This commit is contained in:
Arthur Drobot
2017-07-26 09:19:42 -07:00
parent 5f60110385 c19ae3b071
commit 1b9dc5514e
20 changed files with 579 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
src/org/nwapw/abacus/number/Function.java
View File

@@ -1,20 +0,0 @@
package org.nwapw.abacus.number;
import java.util.HashMap;
public abstract class Function {
private static final HashMap<Class<? extends NumberInterface>, Integer> priorityMap =
new HashMap<Class<? extends NumberInterface>, Integer>() {{
put(NaiveNumber.class, 0);
}};
protected abstract boolean matchesParams(NumberInterface[] params);
protected abstract NumberInterface applyInternal(NumberInterface[] params);
public NumberInterface apply(NumberInterface...params) {
if(!matchesParams(params)) return null;
return applyInternal(params);
}
}

94
src/org/nwapw/abacus/number/FunctionDatabase.java
View File

@@ -1,94 +0,0 @@
package org.nwapw.abacus.number;
import java.util.HashMap;
public class FunctionDatabase {
private HashMap<String, Function> functions;
private void registerDefault(){
functions.put("+", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length >= 1;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
NumberInterface sum = params[0];
for(int i = 1; i < params.length; i++){
sum = sum.add(params[i]);
}
return sum;
}
});
functions.put("-", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 2;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
return params[0].subtract(params[1]);
}
});
functions.put("*", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length >= 1;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
NumberInterface product = params[0];
for(int i = 1; i < params.length; i++){
product = product.multiply(params[i]);
}
return product;
}
});
functions.put("/", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 2;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
return params[0].divide(params[1]);
}
});
functions.put("!", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 1;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
NumberInterface factorial = params[0];
NumberInterface multiplier = params[0];
//It is necessary to later prevent calls of factorial on anything but non-negative integers.
while((multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass()))).signum() == 1){
factorial = factorial.multiply(multiplier);
}
return factorial;
}
});
}
public FunctionDatabase(){
functions = new HashMap<>();
registerDefault();
}
public Function getFunction(String name){
return functions.get(name);
}
}

16
src/org/nwapw/abacus/number/NaiveNumber.java
View File

@@ -1,14 +1,30 @@
package org.nwapw.abacus.number;
/**
* An implementation of NumberInterface using a double.
*/
public class NaiveNumber implements NumberInterface {
/**
* The value of this number.
*/
private double value;
/**
* Creates a new NaiveNumber with the given value.
* @param value the value to use.
*/
public NaiveNumber(double value) {
this.value = value;
}
/**
* The number zero.
*/
public static final NaiveNumber ZERO = new NaiveNumber(0);
/**
* The number one.
*/
public static final NaiveNumber ONE = new NaiveNumber(1);
@Override

60
src/org/nwapw/abacus/number/NumberInterface.java
View File

@@ -1,17 +1,77 @@
package org.nwapw.abacus.number;
/**
* An interface used to represent a number.
*/
public interface NumberInterface {
/**
* The precision to which this number operates.
* @return the precision.
*/
int precision();
/**
* Multiplies this number by another, returning
* a new number instance.
* @param multiplier the multiplier
* @return the result of the multiplication.
*/
NumberInterface multiply(NumberInterface multiplier);
/**
* Divides this number by another, returning
* a new number instance.
* @param divisor the divisor
* @return the result of the division.
*/
NumberInterface divide(NumberInterface divisor);
/**
* Adds this number to another, returning
* a new number instance.
* @param summand the summand
* @return the result of the summation.
*/
NumberInterface add(NumberInterface summand);
/**
* Subtracts another number from this number,
* a new number instance.
* @param subtrahend the subtrahend.
* @return the result of the subtraction.
*/
NumberInterface subtract(NumberInterface subtrahend);
/**
* Returns a new instance of this number with
* the sign flipped.
* @return the new instance.
*/
NumberInterface negate();
/**
* Raises this number to an integer power.
* @param exponent
* @return
*/
NumberInterface intPow(int exponent);
/**
* Compares this number to another.
* @param number the number to compare to.
* @return same as Integer.compare();
*/
int compareTo(NumberInterface number);
/**
* Same as Math.signum().
* @return 1 if this number is positive, -1 if this number is negative, 0 if this number is 0.
*/
int signum();
/**
* Promotes this class to another number class.
* @param toClass the class to promote to.
* @return the resulting new instance.
*/
NumberInterface promoteTo(Class<? extends NumberInterface> toClass);
}

28
src/org/nwapw/abacus/number/externalFunction.java
View File

@@ -1,28 +0,0 @@
package org.nwapw.abacus.number;
import java.util.HashMap;
public abstract class externalFunction {
private HashMap<String, Function> functions;
public externalFunction(){
functions=new HashMap<>();
}
public boolean hasFunction(Function x){
return functions.containsKey(x);
}
public Function getFunction(String x){
return functions.get(x);
}
public boolean registerFunction(String x, Function y){
if(!functions.containsKey(x))
return functions.put(x,y)==null;
return false;
}
public Function functionFor(String x){
return null;
}
public abstract void load();
}