freemarker.core.BodyInstruction Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of freemarker-gae Show documentation
Show all versions of freemarker-gae Show documentation
Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* 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 java.util.Collection;
import java.util.Collections;
import java.util.List;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
/**
* An instruction that processes the nested block within a macro instruction.
*/
final class BodyInstruction extends TemplateElement {
private List bodyParameters;
BodyInstruction(List bodyParameters) {
this.bodyParameters = bodyParameters;
}
List getBodyParameters() {
return bodyParameters;
}
/**
* There is actually a subtle but essential point in the code below.
* A macro operates in the context in which it's defined. However,
* a nested block within a macro instruction is defined in the
* context in which the macro was invoked. So, we actually need to
* temporarily switch the namespace and macro context back to
* what it was before macro invocation to implement this properly.
* I (JR) realized this thanks to some incisive comments from Daniel Dekany.
*/
void accept(Environment env) throws IOException, TemplateException {
Context bodyContext = new Context(env);
env.visit(bodyContext);
}
protected String dump(boolean canonical) {
StringBuffer sb = new StringBuffer();
if (canonical) sb.append('<');
sb.append(getNodeTypeSymbol());
if (bodyParameters != null) {
for (int i = 0; i');
return sb.toString();
}
String getNodeTypeSymbol() {
return "#nested";
}
int getParameterCount() {
return bodyParameters != null ? bodyParameters.size() : 0;
}
Object getParameterValue(int idx) {
checkIndex(idx);
return bodyParameters.get(idx);
}
ParameterRole getParameterRole(int idx) {
checkIndex(idx);
return ParameterRole.PASSED_VALUE;
}
private void checkIndex(int idx) {
if (bodyParameters == null || idx >= bodyParameters.size()) {
throw new IndexOutOfBoundsException();
}
}
/*
boolean heedsOpeningWhitespace() {
return true;
}
boolean heedsTrailingWhitespace() {
return true;
}
*/
class Context implements LocalContext {
Macro.Context invokingMacroContext;
Environment.Namespace bodyVars;
Context(Environment env) throws TemplateException {
invokingMacroContext = env.getCurrentMacroContext();
List bodyParameterNames = invokingMacroContext.bodyParameterNames;
if (bodyParameters != null) {
for (int i=0; i