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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.commands;

import com.thoughtworks.selenium.webdriven.ElementFinder;
import com.thoughtworks.selenium.webdriven.JavascriptLibrary;
import com.thoughtworks.selenium.webdriven.SeleneseCommand;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

public class GetElementIndex extends SeleneseCommand {
  private final ElementFinder finder;
  private final JavascriptLibrary js;

  public GetElementIndex(ElementFinder finder, JavascriptLibrary js) {
    this.finder = finder;
    this.js = js;
  }

  @Override
  protected Number handleSeleneseCommand(WebDriver driver, String locator, String value) {
    WebElement element = finder.findElement(driver, locator);

    String script =
        "var _isCommentOrEmptyTextNode = function(node) {\n" +
        "    return node.nodeType == 8 || ((node.nodeType == 3) && !(/[^\\t\\n\\r ]/.test(node.data)));\n" +
        "};\n" +
        "    var element = arguments[0];\n" +
        "    var previousSibling;\n" +
        "    var index = 0;\n" +
        "    while ((previousSibling = element.previousSibling) != null) {\n" +
        "        if (!_isCommentOrEmptyTextNode(previousSibling)) {\n" +
        "            index++;\n" +
        "        }\n" +
        "        element = previousSibling;\n" +
        "    }\n" +
        "    return index;";

    return (Long) js.executeScript(driver, script, element);
  }
}