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Powerful multi-pass preprocessor to process directives situated in C-styled commentaries

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/*
 * Copyright 2002-2019 Igor Maznitsa (http://www.igormaznitsa.com)
 *
 * 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 com.igormaznitsa.jcp.expression.functions;

import static org.apache.commons.text.StringEscapeUtils.escapeHtml3;


import com.igormaznitsa.jcp.context.PreprocessorContext;
import com.igormaznitsa.jcp.expression.Value;
import com.igormaznitsa.jcp.expression.ValueType;

/**
 * The class implements the str2web function handler
 *
 * @author Igor Maznitsa ([email protected])
 */
public final class FunctionSTR2WEB extends AbstractStrConverter {

  @Override

  public String getName() {
    return "str2web";
  }

  @Override

  public Value executeStr(final PreprocessorContext context, final Value value) {
    final String escaped = escapeHtml3(value.asString());

    final StringBuilder result = new StringBuilder(escaped.length() * 2);
    for (int i = 0; i < escaped.length(); i++) {
      final char ch = escaped.charAt(i);
      if (ch < 128) {
        result.append(ch);
      } else {
        result.append("&#").append(Character.codePointAt(escaped, i)).append(';');
      }
    }

    return Value.valueOf(result.toString());
  }

  @Override

  public String getReference() {
    return "escape string for HTML3";
  }

  @Override

  public ValueType getResultType() {
    return ValueType.STRING;
  }
}