/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* Licensed 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 freemarker.core;
import java.io.IOException;
import freemarker.template.TemplateException;
/**
* An instruction that does multiple assignments, like [#local x=1 x=2].
* Each assignment is represented by a {@link Assignment} child element.
* If there's only one assignment, its usually just a {@link Assignment} without parent {@link AssignmentInstruction}.
*/
final class AssignmentInstruction extends TemplateElement {
private int scope;
private Expression namespaceExp;
AssignmentInstruction(int scope) {
this.scope = scope;
setRegulatedChildBufferCapacity(1);
}
void addAssignment(Assignment assignment) {
addRegulatedChild(assignment);
}
void setNamespaceExp(Expression namespaceExp) {
this.namespaceExp = namespaceExp;
int ln = getRegulatedChildCount();
for (int i = 0; i < ln; i++) {
((Assignment) getRegulatedChild(i)).setNamespaceExp(namespaceExp);
}
}
@Override
void accept(Environment env) throws TemplateException, IOException {
int ln = getRegulatedChildCount();
for (int i = 0; i < ln; i++) {
Assignment assignment = (Assignment) getRegulatedChild(i);
env.visit(assignment);
}
}
@Override
protected String dump(boolean canonical) {
StringBuilder buf = new StringBuilder();
if (canonical) buf.append('<');
buf.append(Assignment.getDirectiveName(scope));
if (canonical) {
buf.append(' ');
int ln = getRegulatedChildCount();
for (int i = 0; i < ln; i++) {
if (i != 0) {
buf.append(", ");
}
Assignment assignment = (Assignment) getRegulatedChild(i);
buf.append(assignment.getCanonicalForm());
}
} else {
buf.append("-container");
}
if (namespaceExp != null) {
buf.append(" in ");
buf.append(namespaceExp.getCanonicalForm());
}
if (canonical) buf.append(">");
return buf.toString();
}
@Override
int getParameterCount() {
return 2;
}
@Override
Object getParameterValue(int idx) {
switch (idx) {
case 0: return Integer.valueOf(scope);
case 1: return namespaceExp;
default: return null;
}
}
@Override
ParameterRole getParameterRole(int idx) {
switch (idx) {
case 0: return ParameterRole.VARIABLE_SCOPE;
case 1: return ParameterRole.NAMESPACE;
default: return null;
}
}
@Override
String getNodeTypeSymbol() {
return Assignment.getDirectiveName(scope);
}
@Override
public TemplateElement postParseCleanup(boolean stripWhitespace) throws ParseException {
super.postParseCleanup(stripWhitespace);
return this;
}
@Override
boolean isNestedBlockRepeater() {
return false;
}
}