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SimpleFor.java
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SimpleFor.java
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/*
* WorldEdit, a Minecraft world manipulation toolkit
* Copyright (C) sk89q <http://www.sk89q.com>
* Copyright (C) WorldEdit team and contributors
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldedit.internal.expression.runtime;
import com.sk89q.worldedit.internal.expression.Expression;
import com.sk89q.worldedit.internal.expression.parser.ParserException;
/**
* A simple-style for loop.
*/
public class SimpleFor extends Node {
LValue counter;
RValue first;
RValue last;
RValue body;
public SimpleFor(int position, LValue counter, RValue first, RValue last, RValue body) {
super(position);
this.counter = counter;
this.first = first;
this.last = last;
this.body = body;
}
@Override
public double getValue() throws EvaluationException {
int iterations = 0;
double ret = 0.0;
double firstValue = first.getValue();
double lastValue = last.getValue();
for (double i = firstValue; i <= lastValue; ++i) {
if (iterations > 256) {
throw new EvaluationException(getPosition(), "Loop exceeded 256 iterations.");
}
if (Thread.interrupted()) {
throw new EvaluationException(getPosition(), "Calculations exceeded time limit.");
}
++iterations;
try {
counter.assign(i);
ret = body.getValue();
} catch (BreakException e) {
if (e.doContinue) {
//noinspection UnnecessaryContinue
continue;
} else {
break;
}
}
}
return ret;
}
@Override
public char id() {
return 'S';
}
@Override
public String toString() {
return "for (" + counter + " = " + first + ", " + last + ") { " + body + " }";
}
@Override
public RValue optimize() throws EvaluationException {
// TODO: unroll small loops into Sequences
return new SimpleFor(getPosition(), 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;
}
}