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  /*
   * 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.Writer;
 import java.util.Map;
 
A method that takes a parameter and evaluates it as a scalar, then treats that scalar as template source code and returns a transform model that evaluates the template in place. The template inherits the configuration and environment of the executing template. By default, its name will be equal to executingTemplate.getName() + "$anonymous_interpreted". You can specify another parameter to the method call in which case the template name suffix is the specified id instead of "anonymous_interpreted".
 
 class Interpret extends BuiltIn
 {
    
Constructs a template on-the-fly and returns it embedded in a freemarker.template.TemplateTransformModel.

The built-in has two arguments: the arguments passed to the method. It can receive at least one and at most two arguments, both must evaluate to a scalar. The first scalar is interpreted as a template source code and a template is built from it. The second (optional) is used to give the generated template a name.

Returns:
a freemarker.template.TemplateTransformModel that when executed inside a <transform> block will process the generated template just as if it had been <transform>-ed at that point.
 
             throws TemplateException 
     {
         TemplateModel model = .eval(env);
         Expression sourceExpr = null;
         String id = "anonymous_interpreted";
         if(model instanceof TemplateSequenceModel)
         {
             sourceExpr = ((Expression)new DynamicKeyName(new NumberLiteral(new Integer(0))).copyLocationFrom());
             if(((TemplateSequenceModel)model).size() > 1)
             {
                 id = ((Expression)new DynamicKeyName(new NumberLiteral(new Integer(1))).copyLocationFrom()).evalAndCoerceToString(env);
             }
         }
         else if (model instanceof TemplateScalarModel)
         {
             sourceExpr = ;
         }
         else
         {
             throw new UnexpectedTypeException(
                     model,
                     "sequence or string"new Class[] { TemplateSequenceModel.classTemplateScalarModel.class },
                     env);
         }
         String templateSource = sourceExpr.evalAndCoerceToString(env);
         Template parentTemplate = env.getTemplate();
         
         final Template interpretedTemplate;
         try
         {
             interpretedTemplate = new Template(
                     (parentTemplate.getName() != null ? parentTemplate.getName() : "nameless_template") + "->" + id,
                     templateSource,
                     parentTemplate.getConfiguration());
         }
         catch(IOException e)
         {
             throw new _MiscTemplateException(thiseenvnew Object[] {
                         "Template parsing with \"?""\" has failed with this error:\n\n",
                         .,
                        new _DelayedGetMessage(e),
                        .,
                        "\n\nThe failed expression:" });
        }
        
        interpretedTemplate.setLocale(env.getLocale());
        return new TemplateProcessorModel(interpretedTemplate);
    }
    private class TemplateProcessorModel
    implements
    {
        private final Template template;
        
        TemplateProcessorModel(Template template)
        {
            this. = template;
        }
        
        public Writer getWriter(final Writer outMap argsthrows TemplateModelExceptionIOException
        {
            try
            {
                Environment env = Environment.getCurrentEnvironment();
                boolean lastFIRE = env.setFastInvalidReferenceExceptions(false);
                try {
                    env.include();
                } finally {
                    env.setFastInvalidReferenceExceptions(lastFIRE);
                }
            }
            catch(Exception e)
            {
                throw new _TemplateModelException(enew Object[] {
                        "Template created with \"?""\" has stopped with this error:\n\n",
                        .,
                        new _DelayedGetMessage(e),
                        . });
            }
    
            return new Writer(out)
            {
                public void close()
                {
                }
                
                public void flush() throws IOException
                {
                    out.flush();
                }
                
                public void write(char[] cbufint offint lenthrows IOException
                {
                    out.write(cbufofflen);
                }
            };
        }
    }
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