/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.painless.node;
import org.elasticsearch.painless.Definition.Sort;
import org.elasticsearch.painless.Definition.Type;
import org.elasticsearch.painless.Globals;
import org.elasticsearch.painless.Locals;
import org.elasticsearch.painless.Locals.Variable;
import org.elasticsearch.painless.Location;
import org.elasticsearch.painless.MethodWriter;
import java.util.Objects;
import java.util.Set;
/**
* Represents a for-each loop and defers to subnodes depending on type.
*/
public class SEach extends AStatement {
private final String type;
private final String name;
private AExpression expression;
private final SBlock block;
private AStatement sub = null;
public SEach(Location location, String type, String name, AExpression expression, SBlock block) {
super(location);
this.type = Objects.requireNonNull(type);
this.name = Objects.requireNonNull(name);
this.expression = Objects.requireNonNull(expression);
this.block = block;
}
@Override
void extractVariables(Set<String> variables) {
variables.add(name);
expression.extractVariables(variables);
if (block != null) {
block.extractVariables(variables);
}
}
@Override
void analyze(Locals locals) {
expression.analyze(locals);
expression.expected = expression.actual;
expression = expression.cast(locals);
final Type type;
try {
type = locals.getDefinition().getType(this.type);
} catch (IllegalArgumentException exception) {
throw createError(new IllegalArgumentException("Not a type [" + this.type + "]."));
}
locals = Locals.newLocalScope(locals);
Variable variable = locals.addVariable(location, type, name, true);
if (expression.actual.sort == Sort.ARRAY) {
sub = new SSubEachArray(location, variable, expression, block);
} else if (expression.actual.sort == Sort.DEF || Iterable.class.isAssignableFrom(expression.actual.clazz)) {
sub = new SSubEachIterable(location, variable, expression, block);
} else {
throw createError(new IllegalArgumentException("Illegal for each type [" + expression.actual.name + "]."));
}
sub.analyze(locals);
if (block == null) {
throw createError(new IllegalArgumentException("Extraneous for each loop."));
}
block.beginLoop = true;
block.inLoop = true;
block.analyze(locals);
block.statementCount = Math.max(1, block.statementCount);
if (block.loopEscape && !block.anyContinue) {
throw createError(new IllegalArgumentException("Extraneous for loop."));
}
statementCount = 1;
if (locals.hasVariable(Locals.LOOP)) {
sub.loopCounter = locals.getVariable(location, Locals.LOOP);
}
}
@Override
void write(MethodWriter writer, Globals globals) {
sub.write(writer, globals);
}
@Override
public String toString() {
return singleLineToString(type, name, expression, block);
}
}