"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = removeComments;

var _helpers = require("../helpers");

/** Removes HTML comments */
function removeComments(tree, options, removeType) {
  if (removeType !== 'all' && removeType !== 'safe') {
    removeType = 'safe';
  }

  tree.walk(function (node) {
    if (node.contents && node.contents.length) {
      node.contents = node.contents.filter(function (content) {
        return !isCommentToRemove(content, removeType);
      });
    } else if (isCommentToRemove(node, removeType)) {
      node = '';
    }

    return node;
  });
  return tree;
}

function isCommentToRemove(text, removeType) {
  if (typeof text !== 'string') {
    return false;
  }

  if (!(0, _helpers.isComment)(text)) {
    // Not HTML comment
    return false;
  }

  var isNoindex = text === '<!--noindex-->' || text === '<!--/noindex-->';

  if (removeType === 'safe' && isNoindex) {
    // Don't remove noindex comments.
    // See: https://yandex.com/support/webmaster/controlling-robot/html.xml
    return false;
  } // https://en.wikipedia.org/wiki/Conditional_comment


  if (removeType === 'safe' && (0, _helpers.isConditionalComment)(text)) {
    return false;
  }

  return true;
}