function Readability()

in Readability.js [27:109]

• 42 lines of code
• 14 McCabe index (conditional complexity)

function Readability(doc, options) {
  // In some older versions, people passed a URI as the first argument. Cope:
  if (options && options.documentElement) {
    doc = options;
    options = arguments[2];
  } else if (!doc || !doc.documentElement) {
    throw new Error(
      "First argument to Readability constructor should be a document object."
    );
  }
  options = options || {};

  this._doc = doc;
  this._docJSDOMParser = this._doc.firstChild.__JSDOMParser__;
  this._articleTitle = null;
  this._articleByline = null;
  this._articleDir = null;
  this._articleSiteName = null;
  this._attempts = [];
  this._metadata = {};

  // Configurable options
  this._debug = !!options.debug;
  this._maxElemsToParse =
    options.maxElemsToParse || this.DEFAULT_MAX_ELEMS_TO_PARSE;
  this._nbTopCandidates =
    options.nbTopCandidates || this.DEFAULT_N_TOP_CANDIDATES;
  this._charThreshold = options.charThreshold || this.DEFAULT_CHAR_THRESHOLD;
  this._classesToPreserve = this.CLASSES_TO_PRESERVE.concat(
    options.classesToPreserve || []
  );
  this._keepClasses = !!options.keepClasses;
  this._serializer =
    options.serializer ||
    function (el) {
      return el.innerHTML;
    };
  this._disableJSONLD = !!options.disableJSONLD;
  this._allowedVideoRegex = options.allowedVideoRegex || this.REGEXPS.videos;
  this._linkDensityModifier = options.linkDensityModifier || 0;

  // Start with all flags set
  this._flags =
    this.FLAG_STRIP_UNLIKELYS |
    this.FLAG_WEIGHT_CLASSES |
    this.FLAG_CLEAN_CONDITIONALLY;

  // Control whether log messages are sent to the console
  if (this._debug) {
    let logNode = function (node) {
      if (node.nodeType == node.TEXT_NODE) {
        return `${node.nodeName} ("${node.textContent}")`;
      }
      let attrPairs = Array.from(node.attributes || [], function (attr) {
        return `${attr.name}="${attr.value}"`;
      }).join(" ");
      return `<${node.localName} ${attrPairs}>`;
    };
    this.log = function () {
      if (typeof console !== "undefined") {
        let args = Array.from(arguments, arg => {
          if (arg && arg.nodeType == this.ELEMENT_NODE) {
            return logNode(arg);
          }
          return arg;
        });
        args.unshift("Reader: (Readability)");
        // eslint-disable-next-line no-console
        console.log(...args);
      } else if (typeof dump !== "undefined") {
        /* global dump */
        var msg = Array.prototype.map
          .call(arguments, function (x) {
            return x && x.nodeName ? logNode(x) : x;
          })
          .join(" ");
        dump("Reader: (Readability) " + msg + "\n");
      }
    };
  } else {
    this.log = function () {};
  }
}