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Merge pull request #264 from sk89q/expression

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Expression parser changes
This commit is contained in:
Albert Pham 2013-09-22 11:39:13 -07:00
commit 0f764187d0
21 changed files with 409 additions and 35 deletions
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18
src/main/java/com/sk89q/worldedit/EditSession.java
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@ -2808,10 +2808,15 @@ public class EditSession {
final RValue typeVariable = expression.getVariable("type", false);
final RValue dataVariable = expression.getVariable("data", false);
final WorldEditExpressionEnvironment environment = new WorldEditExpressionEnvironment(this, unit, zero);
expression.setEnvironment(environment);
final ArbitraryShape shape = new ArbitraryShape(region) {
@Override
protected BaseBlock getMaterial(int x, int y, int z, BaseBlock defaultMaterial) {
final Vector scaled = new Vector(x, y, z).subtract(zero).divide(unit);
final Vector current = new Vector(x, y, z);
environment.setCurrentBlock(current);
final Vector scaled = current.subtract(zero).divide(unit);
try {
if (expression.evaluate(scaled.getX(), scaled.getY(), scaled.getZ(), defaultMaterial.getType(), defaultMaterial.getData()) <= 0) {
@ -2837,7 +2842,8 @@ public class EditSession {
final RValue y = expression.getVariable("y", false);
final RValue z = expression.getVariable("z", false);
Vector zero2 = zero.add(0.5, 0.5, 0.5);
final WorldEditExpressionEnvironment environment = new WorldEditExpressionEnvironment(this, unit, zero);
expression.setEnvironment(environment);
final DoubleArrayList<BlockVector, BaseBlock> queue = new DoubleArrayList<BlockVector, BaseBlock>(false);
@ -2848,13 +2854,11 @@ public class EditSession {
// transform
expression.evaluate(scaled.getX(), scaled.getY(), scaled.getZ());
final Vector sourceScaled = new Vector(x.getValue(), y.getValue(), z.getValue());
// unscale, unoffset, round-nearest
final BlockVector sourcePosition = sourceScaled.multiply(unit).add(zero2).toBlockPoint();
final BlockVector sourcePosition = environment.toWorld(scaled.getX(), scaled.getY(), scaled.getZ());
// read block from world
BaseBlock material = new BaseBlock(world.getBlockType(sourcePosition), world.getBlockData(sourcePosition));
// TODO: use getBlock here once the reflection is out of the way
final BaseBlock material = new BaseBlock(world.getBlockType(sourcePosition), world.getBlockData(sourcePosition));
// queue operation
queue.put(position, material);

59
src/main/java/com/sk89q/worldedit/WorldEditExpressionEnvironment.java Normal file
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@ -0,0 +1,59 @@
package com.sk89q.worldedit;
import com.sk89q.worldedit.expression.runtime.ExpressionEnvironment;
class WorldEditExpressionEnvironment implements ExpressionEnvironment {
private final Vector unit;
private final Vector zero2;
private Vector current = new Vector();
private EditSession editSession;
public WorldEditExpressionEnvironment(EditSession editSession, Vector unit, Vector zero) {
this.editSession = editSession;
this.unit = unit;
this.zero2 = zero.add(0.5, 0.5, 0.5);
}
public BlockVector toWorld(double x, double y, double z) {
// unscale, unoffset, round-nearest
return new Vector(x, y, z).multiply(unit).add(zero2).toBlockPoint();
}
public Vector toWorldRel(double x, double y, double z) {
return current.add(x, y, z);
}
@Override
public int getBlockType(double x, double y, double z) {
return editSession.getBlockType(toWorld(x, y, z));
}
@Override
public int getBlockData(double x, double y, double z) {
return editSession.getBlockData(toWorld(x, y, z));
}
@Override
public int getBlockTypeAbs(double x, double y, double z) {
return editSession.getBlockType(new Vector(x, y, z));
}
@Override
public int getBlockDataAbs(double x, double y, double z) {
return editSession.getBlockData(new Vector(x, y, z));
}
@Override
public int getBlockTypeRel(double x, double y, double z) {
return editSession.getBlockType(toWorldRel(x, y, z));
}
@Override
public int getBlockDataRel(double x, double y, double z) {
return editSession.getBlockData(toWorldRel(x, y, z));
}
public void setCurrentBlock(Vector current) {
this.current = current;
}
}

21
src/main/java/com/sk89q/worldedit/expression/Expression.java
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@ -24,11 +24,15 @@ import java.util.List;
import java.util.Map;
import java.util.Stack;
import com.sk89q.worldedit.BlockVector;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.expression.lexer.Lexer;
import com.sk89q.worldedit.expression.lexer.tokens.Token;
import com.sk89q.worldedit.expression.parser.Parser;
import com.sk89q.worldedit.expression.runtime.ExpressionEnvironment;
import com.sk89q.worldedit.expression.runtime.Constant;
import com.sk89q.worldedit.expression.runtime.EvaluationException;
import com.sk89q.worldedit.expression.runtime.Functions;
import com.sk89q.worldedit.expression.runtime.RValue;
import com.sk89q.worldedit.expression.runtime.ReturnException;
import com.sk89q.worldedit.expression.runtime.Variable;
@ -42,7 +46,7 @@ import com.sk89q.worldedit.expression.runtime.Variable;
* Arithmetic: +, -, *, /, % (modulo), ^ (power), - (unary), --, ++ (prefix only)
* Comparison: <=, >=, >, <, ==, !=, ~= (near)
*
* Supported functions: abs, acos, asin, atan, atan2, cbrt, ceil, cos, cosh, exp, floor, ln, log, log10, max, max, min, min, rint, round, sin, sinh, sqrt, tan, tanh
* Supported functions: abs, acos, asin, atan, atan2, cbrt, ceil, cos, cosh, exp, floor, ln, log, log10, max, max, min, min, rint, round, sin, sinh, sqrt, tan, tanh and more. (See the Functions class or the wiki)
*
* Constants: e, pi
*
@ -63,7 +67,8 @@ public class Expression {
private final Map<String, RValue> variables = new HashMap<String, RValue>();
private final String[] variableNames;
private RValue root;
private final Map<Integer, double[]> megabuf = new HashMap<Integer, double[]>();
private final Functions functions = new Functions();
private ExpressionEnvironment environment;
public static Expression compile(String expression, String... variableNames) throws ExpressionException {
return new Expression(expression, variableNames);
@ -153,7 +158,15 @@ public class Expression {
}
}
public Map<Integer, double[]> getMegabuf() {
return megabuf;
public Functions getFunctions() {
return functions;
}
public ExpressionEnvironment getEnvironment() {
return environment;
}
public void setEnvironment(ExpressionEnvironment environment) {
this.environment = environment;
}
}

1
src/main/java/com/sk89q/worldedit/expression/Identifiable.java
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@ -38,6 +38,7 @@ public interface Identifiable {
*
* PseudoTokens:
* p - UnaryOperator
* V - UnboundVariable
*
* Nodes:
* c - Constant

18
src/main/java/com/sk89q/worldedit/expression/parser/Parser.java
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@ -33,6 +33,7 @@ import com.sk89q.worldedit.expression.runtime.Break;
import com.sk89q.worldedit.expression.runtime.Conditional;
import com.sk89q.worldedit.expression.runtime.Constant;
import com.sk89q.worldedit.expression.runtime.For;
import com.sk89q.worldedit.expression.runtime.Function;
import com.sk89q.worldedit.expression.runtime.Functions;
import com.sk89q.worldedit.expression.runtime.LValue;
import com.sk89q.worldedit.expression.runtime.RValue;
@ -84,6 +85,9 @@ public class Parser {
final Token token = peek();
throw new ParserException(token.getPosition(), "Extra token at the end of the input: " + token);
}
ret.bindVariables(expression, false);
return ret;
}
@ -267,9 +271,6 @@ public class Parser {
default:
throw new ParserException(current.getPosition(), "Unexpected keyword '" + keyword + "'");
}
switch (1) {
default:
}
break;
@ -331,13 +332,12 @@ public class Parser {
if (next.id() == '(') {
halfProcessed.add(parseFunctionCall(identifierToken));
} else {
// Ugly hack to make temporary variables work while not sacrificing error reporting.
final boolean isSimpleAssignment = next instanceof OperatorToken && ((OperatorToken) next).operator.equals("=");
RValue variable = expression.getVariable(identifierToken.value, isSimpleAssignment);
final RValue variable = expression.getVariable(identifierToken.value, false);
if (variable == null) {
throw new ParserException(current.getPosition(), "Variable '" + identifierToken.value + "' not found");
halfProcessed.add(new UnboundVariable(identifierToken.getPosition(), identifierToken.value));
} else {
halfProcessed.add(variable);
}
halfProcessed.add(variable);
}
expressionStart = false;
break;
@ -388,7 +388,7 @@ public class Parser {
return tokens.get(position);
}
private Identifiable parseFunctionCall(IdentifierToken identifierToken) throws ParserException {
private Function parseFunctionCall(IdentifierToken identifierToken) throws ParserException {
consumeCharacter('(');
try {

61
src/main/java/com/sk89q/worldedit/expression/parser/UnboundVariable.java Normal file
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@ -0,0 +1,61 @@
package com.sk89q.worldedit.expression.parser;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.runtime.EvaluationException;
import com.sk89q.worldedit.expression.runtime.LValue;
import com.sk89q.worldedit.expression.runtime.RValue;
public class UnboundVariable extends PseudoToken implements LValue {
public final String name;
public UnboundVariable(int position, String name) {
super(position);
this.name = name;
// TODO Auto-generated constructor stub
}
@Override
public char id() {
// TODO Auto-generated method stub
return 'V';
}
@Override
public String toString() {
return "UnboundVariable(" + name + ")";
}
@Override
public double getValue() throws EvaluationException {
throw new EvaluationException(getPosition(), "Tried to evaluate unbound variable!");
}
@Override
public LValue optimize() throws EvaluationException {
throw new EvaluationException(getPosition(), "Tried to optimize unbound variable!");
}
@Override
public double assign(double value) throws EvaluationException {
throw new EvaluationException(getPosition(), "Tried to assign unbound variable!");
}
public RValue bind(Expression expression, boolean isLValue) throws ParserException {
final RValue variable = expression.getVariable(name, isLValue);
if (variable == null) {
throw new ParserException(getPosition(), "Variable '" + name + "' not found");
}
return variable;
}
@Override
public LValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
final RValue variable = expression.getVariable(name, preferLValue);
if (variable == null) {
throw new ParserException(getPosition(), "Variable '" + name + "' not found");
}
return (LValue) variable;
}
}

20
src/main/java/com/sk89q/worldedit/expression/runtime/Conditional.java
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@ -19,15 +19,18 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* An if/else statement or a ternary operator.
*
* @author TomyLobo
*/
public class Conditional extends Node {
RValue condition;
RValue truePart;
RValue falsePart;
private RValue condition;
private RValue truePart;
private RValue falsePart;
public Conditional(int position, RValue condition, RValue truePart, RValue falsePart) {
super(position);
@ -76,4 +79,15 @@ public class Conditional extends Node {
return new Conditional(getPosition(), newCondition, truePart.optimize(), falsePart == null ? null : falsePart.optimize());
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
condition = condition.bindVariables(expression, false);
truePart = truePart.bindVariables(expression, false);
if (falsePart != null) {
falsePart = falsePart.bindVariables(expression, false);
}
return this;
}
}

16
src/main/java/com/sk89q/worldedit/expression/runtime/ExpressionEnvironment.java Normal file
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@ -0,0 +1,16 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.BlockVector;
import com.sk89q.worldedit.Vector;
/**
* Represents a way to access blocks in a world. Has to accept non-rounded coordinates.
*/
public interface ExpressionEnvironment {
int getBlockType(double x, double y, double z);
int getBlockData(double x, double y, double z);
int getBlockTypeAbs(double x, double y, double z);
int getBlockDataAbs(double x, double y, double z);
int getBlockTypeRel(double x, double y, double z);
int getBlockDataRel(double x, double y, double z);
}

14
src/main/java/com/sk89q/worldedit/expression/runtime/For.java
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@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A Java/C-style for loop.
*
@ -54,6 +57,7 @@ public class For extends Node {
ret = body.getValue();
} catch (BreakException e) {
if (e.doContinue) {
//noinspection UnnecessaryContinue
continue;
} else {
break;
@ -87,4 +91,14 @@ public class For extends Node {
//return new Sequence(getPosition(), init.optimize(), new While(getPosition(), condition, new Sequence(getPosition(), body, increment), false)).optimize();
return new For(getPosition(), init.optimize(), newCondition, increment.optimize(), body.optimize());
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
init = init.bindVariables(expression, false);
condition = condition.bindVariables(expression, false);
increment = increment.bindVariables(expression, false);
body = body.bindVariables(expression, false);
return this;
}
}

16
src/main/java/com/sk89q/worldedit/expression/runtime/Function.java
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@ -24,6 +24,9 @@ import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* Wrapper for a Java method and its arguments (other Nodes)
*
@ -102,10 +105,19 @@ public class Function extends Node {
if (optimizable) {
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);
}
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
final Class<?>[] parameters = method.getParameterTypes();
for (int i = 0; i < args.length; ++i) {
final boolean argumentPrefersLValue = LValue.class.isAssignableFrom(parameters[i]);
args[i] = args[i].bindVariables(expression, argumentPrefersLValue);
}
return this;
}
}

69
src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java
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@ -78,6 +78,10 @@ public final class Functions {
return false;
}
if (this.method.getParameterTypes().length != args.length) { // TODO: optimize
return false;
}
int accum = 0;
for (RValue argument : args) {
accum <<= 2;
@ -113,7 +117,7 @@ public final class Functions {
}
}
throw new NoSuchMethodException();
throw new NoSuchMethodException(); // TODO: return null (check for side-effects first)
}
private static final Map<String, List<Overload>> functions = new HashMap<String, List<Overload>>();
@ -273,6 +277,7 @@ public final class Functions {
private static final Map<Integer, double[]> gmegabuf = new HashMap<Integer, double[]>();
private final Map<Integer, double[]> megabuf = new HashMap<Integer, double[]>();
private static double[] getSubBuffer(Map<Integer, double[]> megabuf, Integer key) {
double[] ret = megabuf.get(key);
@ -302,18 +307,18 @@ public final class Functions {
@Dynamic
public static double megabuf(RValue index) throws EvaluationException {
return getBufferItem(Expression.getInstance().getMegabuf(), (int) index.getValue());
return getBufferItem(Expression.getInstance().getFunctions().megabuf, (int) index.getValue());
}
@Dynamic
public static double megabuf(RValue index, double value) throws EvaluationException {
return setBufferItem(Expression.getInstance().getMegabuf(), (int) index.getValue(), value);
return setBufferItem(Expression.getInstance().getFunctions().megabuf, (int) index.getValue(), value);
}
@Dynamic
public static double closest(RValue x, RValue y, RValue z, RValue index, RValue count, RValue stride) throws EvaluationException {
return findClosest(
Expression.getInstance().getMegabuf(),
Expression.getInstance().getFunctions().megabuf,
x.getValue(),
y.getValue(),
z.getValue(),
@ -370,4 +375,60 @@ public final class Functions {
public static double randint(RValue max) throws EvaluationException {
return random.nextInt((int) Math.floor(max.getValue()));
}
private static double queryInternal(LValue type, LValue data, double typeId, double dataValue) throws EvaluationException {
// Compare to input values and determine return value
final double ret = typeId == type.getValue() && typeId == type.getValue() ? 1.0 : 0.0;
type.assign(typeId);
data.assign(dataValue);
return ret;
}
@Dynamic
public static double query(RValue x, RValue y, RValue z, LValue type, LValue data) throws EvaluationException {
final double xp = x.getValue();
final double yp = y.getValue();
final double zp = z.getValue();
final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
// Read values from world
final double typeId = environment.getBlockType(xp, yp, zp);
final double dataValue = environment.getBlockData(xp, yp, zp);
return queryInternal(type, data, typeId, dataValue);
}
@Dynamic
public static double queryAbs(RValue x, RValue y, RValue z, LValue type, LValue data) throws EvaluationException {
final double xp = x.getValue();
final double yp = y.getValue();
final double zp = z.getValue();
final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
// Read values from world
final double typeId = environment.getBlockTypeAbs(xp, yp, zp);
final double dataValue = environment.getBlockDataAbs(xp, yp, zp);
return queryInternal(type, data, typeId, dataValue);
}
@Dynamic
public static double queryRel(RValue x, RValue y, RValue z, LValue type, LValue data) throws EvaluationException {
final double xp = x.getValue();
final double yp = y.getValue();
final double zp = z.getValue();
final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
// Read values from world
final double typeId = environment.getBlockTypeRel(xp, yp, zp);
final double dataValue = environment.getBlockDataRel(xp, yp, zp);
return queryInternal(type, data, typeId, dataValue);
}
}

7
src/main/java/com/sk89q/worldedit/expression/runtime/LValue.java
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@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A value that can be used on the left side of an assignment.
*
@ -26,4 +29,8 @@ package com.sk89q.worldedit.expression.runtime;
*/
public interface LValue extends RValue {
public double assign(double value) throws EvaluationException;
public LValue optimize() throws EvaluationException;
public LValue bindVariables(Expression expression, boolean preferLValue) throws ParserException;
}

27
src/main/java/com/sk89q/worldedit/expression/runtime/LValueFunction.java
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@ -21,6 +21,9 @@ package com.sk89q.worldedit.expression.runtime;
import java.lang.reflect.Method;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* Wrapper for a pair of Java methods and their arguments (other Nodes), forming an LValue
*
@ -28,10 +31,11 @@ import java.lang.reflect.Method;
*/
public class LValueFunction extends Function implements LValue {
private final Object[] setterArgs;
final Method setter;
private final Method setter;
LValueFunction(int position, Method getter, Method setter, RValue... args) {
super(position, getter, args);
assert (getter.isAnnotationPresent(Dynamic.class));
setterArgs = new Object[args.length + 1];
System.arraycopy(args, 0, setterArgs, 0, args.length);
@ -48,4 +52,25 @@ public class LValueFunction extends Function implements LValue {
setterArgs[setterArgs.length - 1] = value;
return invokeMethod(setter, setterArgs);
}
@Override
public LValue optimize() throws EvaluationException {
final RValue optimized = super.optimize();
if (optimized == this) {
return this;
}
if (optimized instanceof Function) {
return new LValueFunction(optimized.getPosition(), method, setter, ((Function) optimized).args);
}
return (LValue) optimized;
}
@Override
public LValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
super.bindVariables(expression, preferLValue);
return this;
}
}

8
src/main/java/com/sk89q/worldedit/expression/runtime/Node.java
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@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A node in the execution tree of an expression.
*
@ -42,4 +45,9 @@ public abstract class Node implements RValue {
public final int getPosition() {
return position;
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
return this;
}
}

4
src/main/java/com/sk89q/worldedit/expression/runtime/RValue.java
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@ -19,7 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.Identifiable;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A value that can be used on the right side of an assignment.
@ -30,4 +32,6 @@ public interface RValue extends Identifiable {
public double getValue() throws EvaluationException;
public RValue optimize() throws EvaluationException;
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException;
}

10
src/main/java/com/sk89q/worldedit/expression/runtime/Return.java
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@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A return statement.
*
@ -47,4 +50,11 @@ public class Return extends Node {
public String toString() {
return "return " + value;
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
value = value.bindVariables(expression, false);
return this;
}
}

12
src/main/java/com/sk89q/worldedit/expression/runtime/Sequence.java
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@ -22,6 +22,9 @@ package com.sk89q.worldedit.expression.runtime;
import java.util.ArrayList;
import java.util.List;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A sequence of operations, usually separated by semicolons in the input stream.
*
@ -94,4 +97,13 @@ public class Sequence extends Node {
return new Sequence(getPosition(), newSequence.toArray(new RValue[newSequence.size()]));
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
for (int i = 0; i < sequence.length; ++i) {
sequence[i] = sequence[i].bindVariables(expression, false);
}
return this;
}
}

14
src/main/java/com/sk89q/worldedit/expression/runtime/SimpleFor.java
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@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A simple-style for loop.
*
@ -58,6 +61,7 @@ public class SimpleFor extends Node {
ret = body.getValue();
} catch (BreakException e) {
if (e.doContinue) {
//noinspection UnnecessaryContinue
continue;
} else {
break;
@ -84,4 +88,14 @@ public class SimpleFor extends Node {
return new SimpleFor(getPosition(), (LValue) counter.optimize(), first.optimize(), last.optimize(), body.optimize());
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
counter = counter.bindVariables(expression, true);
first = first.bindVariables(expression, false);
last = last.bindVariables(expression, false);
body = body.bindVariables(expression, false);
return this;
}
}

24
src/main/java/com/sk89q/worldedit/expression/runtime/Switch.java
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@ -26,16 +26,19 @@ import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A switch/case construct.
*
* @author TomyLobo
*/
public class Switch extends Node implements RValue {
private final RValue parameter;
private RValue parameter;
private final Map<Double, Integer> valueMap;
private final RValue[] caseStatements;
private final RValue defaultCase;
private RValue defaultCase;
public Switch(int position, RValue parameter, List<Double> values, List<RValue> caseStatements, RValue defaultCase) {
this(position, parameter, invertList(values), caseStatements, defaultCase);
@ -154,9 +157,7 @@ public class Switch extends Node implements RValue {
final RValue invokable = defaultCase.optimize();
if (invokable instanceof Sequence) {
for (RValue subInvokable : ((Sequence) invokable).sequence) {
newSequence.add(subInvokable);
}
Collections.addAll(newSequence, ((Sequence) invokable).sequence);
} else {
newSequence.add(invokable);
}
@ -191,4 +192,17 @@ public class Switch extends Node implements RValue {
return new Switch(getPosition(), optimizedParameter, newValueMap, newSequence, defaultCase.optimize());
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
parameter = parameter.bindVariables(expression, false);
for (int i = 0; i < caseStatements.length; ++i) {
caseStatements[i] = caseStatements[i].bindVariables(expression, false);
}
defaultCase = defaultCase.bindVariables(expression, false);
return this;
}
}

13
src/main/java/com/sk89q/worldedit/expression/runtime/Variable.java
View File

@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A variable.
*
@ -51,4 +54,14 @@ public final class Variable extends Node implements LValue {
public double assign(double value) {
return this.value = value;
}
@Override
public LValue optimize() throws EvaluationException {
return this;
}
@Override
public LValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
return this;
}
}

12
src/main/java/com/sk89q/worldedit/expression/runtime/While.java
View File

@ -19,6 +19,9 @@
package com.sk89q.worldedit.expression.runtime;
import com.sk89q.worldedit.expression.Expression;
import com.sk89q.worldedit.expression.parser.ParserException;
/**
* A while loop.
*
@ -70,6 +73,7 @@ public class While extends Node {
ret = body.getValue();
} catch (BreakException e) {
if (e.doContinue) {
//noinspection UnnecessaryContinue
continue;
} else {
break;
@ -112,4 +116,12 @@ public class While extends Node {
return new While(getPosition(), newCondition, body.optimize(), footChecked);
}
@Override
public RValue bindVariables(Expression expression, boolean preferLValue) throws ParserException {
condition = condition.bindVariables(expression, false);
body = body.bindVariables(expression, false);
return this;
}
}