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/*******************************************************************************
* Copyright (c) 2005, 2007 committers of openArchitectureWare and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* committers of openArchitectureWare - initial API and implementation
*******************************************************************************/
package org.eclipse.internal.xpand2.ast;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.internal.xpand2.type.IteratorType;
import org.eclipse.internal.xpand2.type.XpandIterator;
import org.eclipse.internal.xtend.expression.ast.Expression;
import org.eclipse.internal.xtend.expression.ast.Identifier;
import org.eclipse.xpand2.XpandExecutionContext;
import org.eclipse.xtend.expression.AnalysationIssue;
import org.eclipse.xtend.expression.EvaluationException;
import org.eclipse.xtend.expression.ExecutionContext;
import org.eclipse.xtend.expression.Variable;
import org.eclipse.xtend.typesystem.ParameterizedType;
import org.eclipse.xtend.typesystem.Type;
/**
* *
*
* @author Sven Efftinge (http://www.efftinge.de) *
*/
public class ForEachStatement extends StatementWithBody {
private Expression target;
private Expression separator;
private Identifier variable;
private Identifier iteratorName;
public ForEachStatement(final Identifier variable, final Expression target,
final Statement[] body, final Expression separator, final Identifier iterator) {
super(body);
this.variable = variable;
this.target = target;
this.separator = separator;
iteratorName = iterator;
}
public Expression getSeparator() {
return separator;
}
public Expression getTarget() {
return target;
}
public Identifier getVariable() {
return variable;
}
public Identifier getIteratorName() {
return iteratorName;
}
@Override
public void analyzeInternal(XpandExecutionContext ctx, final Set<AnalysationIssue> issues) {
Type t = getTarget().analyze(ctx, issues);
if (getSeparator() != null) {
final Type sepT = getSeparator().analyze(ctx, issues);
if (!ctx.getStringType().isAssignableFrom(sepT)) {
issues.add(new AnalysationIssue(AnalysationIssue.INCOMPATIBLE_TYPES, "String expected!", target));
}
}
if (t != null) {
if (ctx.getCollectionType(ctx.getObjectType()).isAssignableFrom(t)) {
if (t instanceof ParameterizedType) {
t = ((ParameterizedType) t).getInnerType();
} else {
t = ctx.getObjectType();
}
} else {
issues.add(new AnalysationIssue(AnalysationIssue.INCOMPATIBLE_TYPES, "Collection type expected!", target));
return;
}
}
ctx = (XpandExecutionContext) ctx.cloneWithVariable(new Variable(getVariable().getValue(), t));
if (iteratorName != null) {
ctx = (XpandExecutionContext) ctx.cloneWithVariable(new Variable(iteratorName.getValue(), ctx.getTypeForName(IteratorType.TYPE_NAME)));
}
for (int i = 0; i < getBody().length; i++) {
getBody()[i].analyze(ctx, issues);
}
}
static String indent = "";
@Override
public void evaluateInternal(XpandExecutionContext ctx) {
Object o = getTarget().evaluate(ctx);
if (o == null)
o = new ArrayList<Object>();
if (!(o instanceof Collection))
throw new EvaluationException("Collection expected!", getTarget(), ctx);
final Collection<?> col = (Collection<?>) o;
final String sep = (String) (getSeparator() != null ? getSeparator().evaluate(ctx) : null);
final XpandIterator iterator = new XpandIterator(col.size());
if (iteratorName != null) {
ctx = (XpandExecutionContext) ctx.cloneWithVariable(new Variable(iteratorName.getValue(), iterator));
}
indent += " ";
for (final Iterator<?> iter = col.iterator(); iter.hasNext();) {
final Object element = iter.next();
ctx = (XpandExecutionContext) ctx.cloneWithVariable(new Variable(getVariable().getValue(), element));
ctx.preTask(this);
for (int i = 0; i < getBody().length; i++) {
getBody()[i].evaluate(ctx);
}
ctx.postTask(this);
if (sep != null && iter.hasNext()) {
ctx.getOutput().write(sep);
}
iterator.increment();
}
indent = indent.substring(2);
}
@Override
public String getNameString(ExecutionContext context) {
return "FOREACH";
}
}
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