nz.net.ultraq.thymeleaf.layoutdialect.models.VariableDeclarationParser.groovy Maven / Gradle / Ivy

/* 
 * 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.layoutdialect.models

import org.thymeleaf.context.IExpressionContext
import org.thymeleaf.standard.expression.AssignationUtils

import groovy.transform.TupleConstructor

/**
 * Parser for variable declaration strings, which are the expressions that are
 * found withing {@code th:with} processors.  This is really a wrapper around
 * Thymeleaf's {@link AssignationUtils} class, which is a crazy house of code
 * that splits the expression string into the parts needed by this dialect.
 * 
 * @author Emanuel Rabina
 */
@TupleConstructor(defaults = false)
class VariableDeclarationParser {

	final IExpressionContext context

	/**
	 * Parse a variable declaration string, returning as many variable declaration
	 * objects as there are variable declarations.
	 * 
	 * @param declarationString
	 * @return List of variable declaration objects.
	 */
	List parse(String declarationString) {

		def assignationSequence = AssignationUtils.parseAssignationSequence(context, declarationString, false)
		return assignationSequence?.collect { assignation ->
			return new VariableDeclaration(assignation)
		}
	}
}