src/main/java/freemarker/core/BuiltInForLegacyEscaping.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 freemarker.core;

import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;

/**
 * A string built-in whose usage is banned when auto-escaping with a markup-output format is active.
 * This is just a marker; the actual checking is in {@code FTL.jj}. 
 */
abstract class BuiltInForLegacyEscaping extends BuiltInBannedWhenAutoEscaping {
    
    @Override
    TemplateModel _eval(Environment env)
    throws TemplateException {
        TemplateModel tm = target.eval(env);
        Object moOrStr = EvalUtil.coerceModelToStringOrMarkup(tm, target, null, env);
        if (moOrStr instanceof String) {
            return calculateResult((String) moOrStr, env);
        } else {
            TemplateMarkupOutputModel<?> mo = (TemplateMarkupOutputModel<?>) moOrStr;
            if (mo.getOutputFormat().isLegacyBuiltInBypassed(key)) {
                return mo;
            }
            throw new NonStringException(target, tm, env);
        }
    }
    
    abstract TemplateModel calculateResult(String s, Environment env) throws TemplateException;
    
}