Added support for assignable function results.

Also:
- Added megabuf(index) as a first, temporary example
- Introduced a new Node class at the top of the hierarchy for the runtime.
- RValue and LValue are now interfaces
- Narrowed down some exception declarations
- Optimized the optimizer for functions
This commit is contained in:
TomyLobo 2011-11-20 17:23:28 +01:00
parent 7812d8f5f8
commit 0c9c213e4e
10 changed files with 199 additions and 75 deletions

View File

@ -41,8 +41,9 @@ public interface Identifiable {
*
* Invokables:
* c - Constant
* f - Function
* v - Variable
* f - Function
* l - LValueFunction
* </pre>
*/
public abstract char id();

View File

@ -24,7 +24,7 @@ package com.sk89q.worldedit.expression.runtime;
*
* @author TomyLobo
*/
public final class Constant extends RValue {
public final class Constant extends Node {
private final double value;
public Constant(int position, double value) {

View File

@ -29,7 +29,7 @@ import java.lang.reflect.Method;
*
* @author TomyLobo
*/
public class Function extends RValue {
public class Function extends Node {
/**
* Add this annotation on functions that don't always return the same value for the same inputs.
*/
@ -47,8 +47,12 @@ public class Function extends RValue {
@Override
public final double getValue() throws EvaluationException {
return invokeMethod(method, args);
}
protected static final double invokeMethod(Method method, Object[] args) throws EvaluationException {
try {
return (Double) method.invoke(null, (Object[]) args);
return (Double) method.invoke(null, args);
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof EvaluationException) {
throw (EvaluationException) e.getTargetException();
@ -79,7 +83,7 @@ public class Function extends RValue {
}
@Override
public RValue optimize() throws EvaluationException {
public Node optimize() throws EvaluationException {
final RValue[] optimizedArgs = new RValue[args.length];
boolean optimizable = !method.isAnnotationPresent(Dynamic.class);
int position = getPosition();
@ -96,7 +100,9 @@ public class Function extends RValue {
}
if (optimizable) {
return new Constant(position, getValue());
return new Constant(position, invokeMethod(method, optimizedArgs));
} else if (this instanceof LValueFunction) {
return new LValueFunction(position, method, ((LValueFunction) this).setter, optimizedArgs);
} else {
return new Function(position, method, optimizedArgs);
}

View File

@ -25,6 +25,8 @@ import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.sk89q.worldedit.expression.runtime.Function.Dynamic;
/**
* Contains all functions that can be used in expressions.
*
@ -34,13 +36,24 @@ public final class Functions {
private static class Overload {
private final Method method;
private final int mask;
private final boolean isSetter;
public Overload(Method method) throws IllegalArgumentException {
this.method = method;
boolean isSetter = false;
int accum = 0;
Class<?>[] parameters = method.getParameterTypes();
for (Class<?> parameter : parameters) {
if (isSetter) {
throw new IllegalArgumentException("Method takes arguments that can't be cast to RValue.");
}
if (double.class.equals(parameter)) {
isSetter = true;
continue;
}
if (!RValue.class.isAssignableFrom(parameter)) {
throw new IllegalArgumentException("Method takes arguments that can't be cast to RValue.");
}
@ -54,9 +67,14 @@ public final class Functions {
}
}
mask = accum;
this.isSetter = isSetter;
}
public boolean matches(RValue... args) {
public boolean matches(boolean isSetter, RValue... args) {
if (this.isSetter != isSetter) {
return false;
}
int accum = 0;
for (RValue argument : args) {
accum <<= 2;
@ -74,14 +92,21 @@ public final class Functions {
public static final Function getFunction(int position, String name, RValue... args) throws NoSuchMethodException {
return new Function(position, getMethod(name, args), args);
final Method getter = getMethod(name, false, args);
try {
Method setter = getMethod(name, true, args);
return new LValueFunction(position, getter, setter, args);
}
catch (NoSuchMethodException e) {
return new Function(position, getter, args);
}
}
private static Method getMethod(String name, RValue... args) throws NoSuchMethodException {
private static Method getMethod(String name, boolean isSetter, RValue... args) throws NoSuchMethodException {
final List<Overload> overloads = functions.get(name);
if (overloads != null) {
for (Overload overload : overloads) {
if (overload.matches(args)) {
if (overload.matches(isSetter, args)) {
return overload.method;
}
}
@ -93,125 +118,130 @@ public final class Functions {
private static final Map<String, List<Overload>> functions = new HashMap<String, List<Overload>>();
static {
for (Method method : Functions.class.getMethods()) {
final String methodName = method.getName();
try {
Overload overload = new Overload(method);
List<Overload> overloads = functions.get(methodName);
if (overloads == null) {
functions.put(methodName, overloads = new ArrayList<Overload>());
}
overloads.add(overload);
addFunction(method);
} catch(IllegalArgumentException e) {}
}
}
public static final double sin(RValue x) throws Exception {
public static void addFunction(Method method) throws IllegalArgumentException {
final String methodName = method.getName();
Overload overload = new Overload(method);
List<Overload> overloads = functions.get(methodName);
if (overloads == null) {
functions.put(methodName, overloads = new ArrayList<Overload>());
}
overloads.add(overload);
}
public static final double sin(RValue x) throws EvaluationException {
return Math.sin(x.getValue());
}
public static final double cos(RValue x) throws Exception {
public static final double cos(RValue x) throws EvaluationException {
return Math.cos(x.getValue());
}
public static final double tan(RValue x) throws Exception {
public static final double tan(RValue x) throws EvaluationException {
return Math.tan(x.getValue());
}
public static final double asin(RValue x) throws Exception {
public static final double asin(RValue x) throws EvaluationException {
return Math.asin(x.getValue());
}
public static final double acos(RValue x) throws Exception {
public static final double acos(RValue x) throws EvaluationException {
return Math.acos(x.getValue());
}
public static final double atan(RValue x) throws Exception {
public static final double atan(RValue x) throws EvaluationException {
return Math.atan(x.getValue());
}
public static final double atan2(RValue y, RValue x) throws Exception {
public static final double atan2(RValue y, RValue x) throws EvaluationException {
return Math.atan2(y.getValue(), x.getValue());
}
public static final double sinh(RValue x) throws Exception {
public static final double sinh(RValue x) throws EvaluationException {
return Math.sinh(x.getValue());
}
public static final double cosh(RValue x) throws Exception {
public static final double cosh(RValue x) throws EvaluationException {
return Math.cosh(x.getValue());
}
public static final double tanh(RValue x) throws Exception {
public static final double tanh(RValue x) throws EvaluationException {
return Math.tanh(x.getValue());
}
public static final double sqrt(RValue x) throws Exception {
public static final double sqrt(RValue x) throws EvaluationException {
return Math.sqrt(x.getValue());
}
public static final double cbrt(RValue x) throws Exception {
public static final double cbrt(RValue x) throws EvaluationException {
return Math.cbrt(x.getValue());
}
public static final double abs(RValue x) throws Exception {
public static final double abs(RValue x) throws EvaluationException {
return Math.abs(x.getValue());
}
public static final double min(RValue a, RValue b) throws Exception {
public static final double min(RValue a, RValue b) throws EvaluationException {
return Math.min(a.getValue(), b.getValue());
}
public static final double min(RValue a, RValue b, RValue c) throws Exception {
public static final double min(RValue a, RValue b, RValue c) throws EvaluationException {
return Math.min(a.getValue(), Math.min(b.getValue(), c.getValue()));
}
public static final double max(RValue a, RValue b) throws Exception {
public static final double max(RValue a, RValue b) throws EvaluationException {
return Math.max(a.getValue(), b.getValue());
}
public static final double max(RValue a, RValue b, RValue c) throws Exception {
public static final double max(RValue a, RValue b, RValue c) throws EvaluationException {
return Math.max(a.getValue(), Math.max(b.getValue(), c.getValue()));
}
public static final double ceil(RValue x) throws Exception {
public static final double ceil(RValue x) throws EvaluationException {
return Math.ceil(x.getValue());
}
public static final double floor(RValue x) throws Exception {
public static final double floor(RValue x) throws EvaluationException {
return Math.floor(x.getValue());
}
public static final double rint(RValue x) throws Exception {
public static final double rint(RValue x) throws EvaluationException {
return Math.rint(x.getValue());
}
public static final double round(RValue x) throws Exception {
public static final double round(RValue x) throws EvaluationException {
return Math.round(x.getValue());
}
public static final double exp(RValue x) throws Exception {
public static final double exp(RValue x) throws EvaluationException {
return Math.exp(x.getValue());
}
public static final double ln(RValue x) throws Exception {
public static final double ln(RValue x) throws EvaluationException {
return Math.log(x.getValue());
}
public static final double log(RValue x) throws Exception {
public static final double log(RValue x) throws EvaluationException {
return Math.log(x.getValue());
}
public static final double log10(RValue x) throws Exception {
public static final double log10(RValue x) throws EvaluationException {
return Math.log10(x.getValue());
}
@ -230,4 +260,17 @@ public final class Functions {
return 0;
}
private static final double[] megabuf = new double[1024];
@Dynamic
public static final double megabuf(RValue index) throws EvaluationException {
return megabuf[(int) index.getValue()];
}
@Dynamic
public static final double megabuf(RValue index, double value) throws EvaluationException {
return megabuf[(int) index.getValue()] = value;
}
}

View File

@ -24,10 +24,6 @@ package com.sk89q.worldedit.expression.runtime;
*
* @author TomyLobo
*/
public abstract class LValue extends RValue {
public LValue(int position) {
super(position);
}
public abstract double assign(double value) throws EvaluationException;
public interface LValue extends RValue {
public double assign(double value) throws EvaluationException;
}

View File

@ -0,0 +1,51 @@
// $Id$
/*
* WorldEdit
* Copyright (C) 2010, 2011 sk89q <http://www.sk89q.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldedit.expression.runtime;
import java.lang.reflect.Method;
/**
* Wrapper for a Java method and its arguments (other Invokables)
*
* @author TomyLobo
*/
public class LValueFunction extends Function implements LValue {
private final Object[] setterArgs;
final Method setter;
LValueFunction(int position, Method getter, Method setter, RValue... args) {
super(position, getter, args);
setterArgs = new Object[args.length + 1];
System.arraycopy(args, 0, setterArgs, 0, args.length);
this.setter = setter;
}
@Override
public char id() {
return 'l';
}
@Override
public double assign(double value) throws EvaluationException {
setterArgs[setterArgs.length - 1] = value;
return invokeMethod(setter, setterArgs);
}
}

View File

@ -0,0 +1,45 @@
// $Id$
/*
* WorldEdit
* Copyright (C) 2010, 2011 sk89q <http://www.sk89q.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldedit.expression.runtime;
/**
* A value that can be used on the right side of an assignment.
*
* @author TomyLobo
*/
public abstract class Node implements RValue {
private final int position;
public Node(int position) {
this.position = position;
}
@Override
public abstract String toString();
public Node optimize() throws EvaluationException {
return this;
}
@Override
public int getPosition() {
return position;
}
}

View File

@ -26,25 +26,7 @@ import com.sk89q.worldedit.expression.Identifiable;
*
* @author TomyLobo
*/
public abstract class RValue implements Identifiable {
private final int position;
public RValue(int position) {
super();
this.position = position;
}
public abstract double getValue() throws EvaluationException;
@Override
public abstract String toString();
public RValue optimize() throws EvaluationException {
return this;
}
@Override
public int getPosition() {
return position;
}
public interface RValue extends Identifiable {
public double getValue() throws EvaluationException;
public Node optimize() throws EvaluationException;
}

View File

@ -27,7 +27,7 @@ import java.util.List;
*
* @author TomyLobo
*/
public class Sequence extends RValue {
public class Sequence extends Node {
private final RValue[] sequence;
public Sequence(int position, RValue... sequence) {
@ -66,7 +66,7 @@ public class Sequence extends RValue {
}
@Override
public RValue optimize() throws EvaluationException {
public Node optimize() throws EvaluationException {
List<RValue> newSequence = new ArrayList<RValue>();
for (RValue invokable : sequence) {

View File

@ -24,7 +24,7 @@ package com.sk89q.worldedit.expression.runtime;
*
* @author TomyLobo
*/
public final class Variable extends LValue {
public final class Variable extends Node implements LValue {
public double value;
public Variable(double value) {