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Added an optimizer and license/element comments for Switch.

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This commit is contained in:
TomyLobo 2011-12-04 20:01:57 +01:00
parent 7a429e9932
commit d55376e8a6
2 changed files with 69 additions and 6 deletions
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4
src/main/java/com/sk89q/worldedit/expression/runtime/Sequence.java
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@ -28,7 +28,7 @@ import java.util.List;
* @author TomyLobo
*/
public class Sequence extends Node {
private final RValue[] sequence;
final RValue[] sequence;
public Sequence(int position, RValue... sequence) {
super(position);
@ -67,7 +67,7 @@ public class Sequence extends Node {
@Override
public RValue optimize() throws EvaluationException {
List<RValue> newSequence = new ArrayList<RValue>();
final List<RValue> newSequence = new ArrayList<RValue>();
RValue droppedLast = null;
for (RValue invokable : sequence) {

71
src/main/java/com/sk89q/worldedit/expression/runtime/Switch.java
View File

@ -1,26 +1,59 @@
// $Id$
/*
* 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.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
/**
* A switch/case construct.
*
* @author TomyLobo
*/
public class Switch extends Node implements RValue {
private final RValue parameter;
private final Map<Double, Integer> valueMap = new HashMap<Double, Integer>();
private final Map<Double, Integer> valueMap;
private final RValue[] caseStatements;
private final RValue defaultCase;
public Switch(int position, RValue parameter, List<Double> values, List<RValue> caseStatements, RValue defaultCase) {
super(position);
this.parameter = parameter;
this(position, parameter, invertList(values), caseStatements, defaultCase);
assert(values.size() == caseStatements.size());
}
private static Map<Double, Integer> invertList(List<Double> values) {
Map<Double, Integer> valueMap = new HashMap<Double, Integer>();
for (int i = 0; i < values.size(); ++i) {
valueMap.put(values.get(i), i);
}
return valueMap;
}
private Switch(int position, RValue parameter, Map<Double, Integer> valueMap, List<RValue> caseStatements, RValue defaultCase) {
super(position);
this.parameter = parameter;
this.valueMap = valueMap;
this.caseStatements = caseStatements.toArray(new RValue[caseStatements.size()]);
this.defaultCase = defaultCase;
}
@ -82,4 +115,34 @@ public class Switch extends Node implements RValue {
return sb.toString();
}
@Override
public RValue optimize() throws EvaluationException {
final List<RValue> newSequence = new ArrayList<RValue>();
final Map<Double, Integer> newValueMap = new HashMap<Double, Integer>();
Map<Integer, Double> backMap = new HashMap<Integer, Double>();
for (Entry<Double, Integer> entry : valueMap.entrySet()) {
backMap.put(entry.getValue(), entry.getKey());
}
for (int i = 0; i < caseStatements.length; ++i) {
final RValue invokable = caseStatements[i].optimize();
final Double caseValue = backMap.get(i);
if (caseValue != null) {
newValueMap.put(caseValue, newSequence.size());
}
if (invokable instanceof Sequence) {
for (RValue subInvokable : ((Sequence) invokable).sequence) {
newSequence.add(subInvokable);
}
} else {
newSequence.add(invokable);
}
}
return new Switch(getPosition(), parameter.optimize(), newValueMap, newSequence, defaultCase.optimize());
}
}