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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.thoughtworks.selenium.webdriven;

import java.util.regex.Pattern;

/**
 * Prepend a variable declaration to a script.
 */
public class VariableDeclaration implements ScriptMutator {
  private final Pattern pattern;
  private final String declaration;

  public VariableDeclaration(String raw, String declaration) {
    this.declaration = declaration;
    raw = raw.replace(".", "\\s*\\.\\s*")
        .replace("(", "\\(")
        .replace(")", "\\)");

    pattern = Pattern.compile(".*" + raw + ".*");
  }

  @Override
  public void mutate(String script, StringBuilder outputTo) {
    if (!pattern.matcher(script).matches()) {
      return;
    }

    outputTo.append(declaration);
  }
}