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/*
* Copyright 2016, Emanuel Rabina (http://www.ultraq.net.nz/)
*
* 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 nz.net.ultraq.thymeleaf.includes
import nz.net.ultraq.thymeleaf.expressions.ExpressionProcessor
import nz.net.ultraq.thymeleaf.fragments.FragmentFinder
import nz.net.ultraq.thymeleaf.fragments.FragmentMap
import nz.net.ultraq.thymeleaf.fragments.FragmentParameterNamesExtractor
import nz.net.ultraq.thymeleaf.fragments.FragmentProcessor
import nz.net.ultraq.thymeleaf.models.TemplateModelFinder
import org.thymeleaf.context.ITemplateContext
import org.thymeleaf.engine.AttributeName
import org.thymeleaf.model.IModel
import org.thymeleaf.processor.element.AbstractAttributeModelProcessor
import org.thymeleaf.processor.element.IElementModelStructureHandler
import org.thymeleaf.templatemode.TemplateMode
/**
* Similar to Thymeleaf's {@code th:insert}, but allows the passing of entire
* element fragments to the included template. Useful if you have some HTML
* that you want to reuse, but whose contents are too complex to determine or
* construct with context variables alone.
*
* @author Emanuel Rabina
*/
class InsertProcessor extends AbstractAttributeModelProcessor {
static final String PROCESSOR_NAME = 'insert'
static final int PROCESSOR_PRECEDENCE = 0
/**
* Constructor, sets this processor to work on the 'insert' attribute.
*
* @param templateMode
* @param dialectPrefix
*/
InsertProcessor(TemplateMode templateMode, String dialectPrefix) {
super(templateMode, dialectPrefix, null, false, PROCESSOR_NAME, true, PROCESSOR_PRECEDENCE, true)
}
/**
* Locates a page fragment and inserts it in the current template.
*
* @param context
* @param model
* @param attributeName
* @param attributeValue
* @param structureHandler
*/
@Override
protected void doProcess(ITemplateContext context, IModel model, AttributeName attributeName,
String attributeValue, IElementModelStructureHandler structureHandler) {
// Locate the page and fragment to insert
def fragmentExpression = new ExpressionProcessor(context).parseFragmentExpression(attributeValue)
def fragmentToInsert = new TemplateModelFinder(context).findFragment(fragmentExpression)
// Gather all fragment parts within this element, scoping them to this element
def includeFragments = new FragmentFinder(dialectPrefix).findFragments(model)
FragmentMap.setForNode(context, structureHandler, includeFragments)
// Keep track of what template is being processed? Thymeleaf does this for
// its include processor, so I'm just doing the same here.
structureHandler.templateData = fragmentToInsert.templateData
// Replace the children of this element with those of the to-be-inserted page fragment
def fragmentToInsertUse = fragmentToInsert.cloneModel()
model.clearChildren()
model.insertModel(1, fragmentToInsertUse)
// When fragment parameters aren't named, derive the name from the fragment definition
// TODO: Common code across all the inclusion processors
if (fragmentExpression.hasSyntheticParameters()) {
def fragmentDefinition = fragmentToInsertUse.first()
.getAttributeValue(dialectPrefix, FragmentProcessor.PROCESSOR_NAME)
def parameterNames = new FragmentParameterNamesExtractor().extract(fragmentDefinition)
fragmentExpression.parameters.eachWithIndex { parameter, index ->
structureHandler.setLocalVariable(parameterNames[index], parameter.right.execute(context))
}
}
// Otherwise, apply values as is
else {
fragmentExpression.parameters.each { parameter ->
structureHandler.setLocalVariable(parameter.left.execute(context), parameter.right.execute(context))
}
}
}
}