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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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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.IOException;

import freemarker.template.TemplateException;
import freemarker.template.utility.StandardCompress;

/**
 * An instruction that reduces all sequences of whitespace to a single
 * space or newline. In addition, leading and trailing whitespace is removed.
 * @see freemarker.template.utility.StandardCompress
 */
final class CompressedBlock extends TemplateElement {

    CompressedBlock(TemplateElement nestedBlock) { 
        this.nestedBlock = nestedBlock;
    }

    void accept(Environment env) throws TemplateException, IOException {
        if (nestedBlock != null) {
            env.visitAndTransform(nestedBlock, StandardCompress.INSTANCE, null);
        }
    }

    protected String dump(boolean canonical) {
        if (canonical) {
            String nested = nestedBlock != null ? nestedBlock.getCanonicalForm() : "";
            return "<" + getNodeTypeSymbol() + ">" + nested + "";
        } else {
            return getNodeTypeSymbol();
        }
    }
    
    String getNodeTypeSymbol() {
        return "#compress";
    }
    
    int getParameterCount() {
        return 0;
    }

    Object getParameterValue(int idx) {
        throw new IndexOutOfBoundsException();
    }

    ParameterRole getParameterRole(int idx) {
        throw new IndexOutOfBoundsException();
    }

    boolean isIgnorable() {
        return nestedBlock == null || nestedBlock.isIgnorable();
    }
    
}