/**
* Copyright (c) 2014-2017 by the respective copyright holders.
* 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
*/
package org.eclipse.smarthome.core.voice.text;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.ResourceBundle;
/**
* Expression that successfully parses, if a sequence of given expressions is matching. This class is immutable.
*
* @author Tilman Kamp - Initial contribution and API
*
*/
public final class ExpressionSequence extends Expression {
private List<Expression> subExpressions;
/**
* Constructs a new instance.
*
* @param subExpressions the sub expressions that are parsed in the given order
*/
public ExpressionSequence(Expression... subExpressions) {
super();
this.subExpressions = Collections
.unmodifiableList(Arrays.asList(Arrays.copyOf(subExpressions, subExpressions.length)));
}
@Override
ASTNode parse(ResourceBundle language, TokenList list) {
int l = subExpressions.size();
ASTNode node = new ASTNode(), cr;
ASTNode[] children = new ASTNode[l];
Object[] values = new Object[l];
for (int i = 0; i < l; i++) {
cr = children[i] = subExpressions.get(i).parse(language, list);
if (!cr.isSuccess()) {
return node;
}
values[i] = cr.getValue();
list = cr.getRemainingTokens();
}
node.setChildren(children);
node.setRemainingTokens(list);
node.setSuccess(true);
node.setValue(values);
generateValue(node);
return node;
}
@Override
List<Expression> getChildExpressions() {
return subExpressions;
}
@Override
boolean collectFirsts(ResourceBundle language, HashSet<String> firsts) {
boolean blocking = false;
for (Expression e : subExpressions) {
if ((blocking = e.collectFirsts(language, firsts)) == true) {
break;
}
}
return blocking;
}
@Override
public String toString() {
String s = null;
for (Expression e : subExpressions) {
s = s == null ? e.toString() : (s + ", " + e.toString());
}
return "seq(" + s + ")";
}
}