querycomments/dist/querycomments.cjs.js

A querycomments library

/*!
 * Querycomments v1.0.0 (https://github.com/victornpb/querycomments)
 * Copyright (c) victornpb
 * @license apache-2
 */
'use strict';

/**
 * Select comment nodes
 * @param  {DOMElement}      [context=document] A DOM node, defaults to document.
 * @param  {function|RegExp} [filter]           Only return comment nodes that match a regular expression or a filter function.
 * @return Array                                A array containing the comment nodes.
 * @author Victor N. wwww.victorborges.com
 * @date   2017-07-07
 */
function queryComments(context, filter) {
  //console.time('getComments');
  var nodeIterator = document.createNodeIterator(context || document, NodeFilter.SHOW_COMMENT, {
    acceptNode: function acceptNode(node) {
      return NodeFilter.FILTER_ACCEPT;
    }
  });
  var control = {
    abort: false,
    breakOnFirst: false
  };
  var comments = [];

  if (typeof filter === "function") {
    while (nodeIterator.nextNode()) {
      if (filter.call(control, nodeIterator.referenceNode.nodeValue, nodeIterator.referenceNode)) {
        comments.push(nodeIterator.referenceNode);
        if (control.breakOnFirst) break;
      }

      if (control.abort) break;
    }
  } else if (filter instanceof RegExp) {
    control.breakOnFirst = !filter.global;

    while (nodeIterator.nextNode()) {
      if (filter.exec(nodeIterator.referenceNode.nodeValue) !== null) {
        comments.push(nodeIterator.referenceNode);
        if (control.breakOnFirst) break;
      }
    }
  } else {
    while (nodeIterator.nextNode()) {
      comments.push(nodeIterator.referenceNode);
    }
  } //console.timeEnd('getComments');


  return comments;
}

module.exports = queryComments;
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