function()

in Readability.js [2345:2420]

• 60 lines of code
• 24 McCabe index (conditional complexity)

      function (elem) {
        // In some sites (e.g. Kotaku), they put 1px square image as base64 data uri in the src attribute.
        // So, here we check if the data uri is too short, just might as well remove it.
        if (elem.src && this.REGEXPS.b64DataUrl.test(elem.src)) {
          // Make sure it's not SVG, because SVG can have a meaningful image in under 133 bytes.
          var parts = this.REGEXPS.b64DataUrl.exec(elem.src);
          if (parts[1] === "image/svg+xml") {
            return;
          }

          // Make sure this element has other attributes which contains image.
          // If it doesn't, then this src is important and shouldn't be removed.
          var srcCouldBeRemoved = false;
          for (var i = 0; i < elem.attributes.length; i++) {
            var attr = elem.attributes[i];
            if (attr.name === "src") {
              continue;
            }

            if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) {
              srcCouldBeRemoved = true;
              break;
            }
          }

          // Here we assume if image is less than 100 bytes (or 133 after encoded to base64)
          // it will be too small, therefore it might be placeholder image.
          if (srcCouldBeRemoved) {
            var b64starts = parts[0].length;
            var b64length = elem.src.length - b64starts;
            if (b64length < 133) {
              elem.removeAttribute("src");
            }
          }
        }

        // also check for "null" to work around https://github.com/jsdom/jsdom/issues/2580
        if (
          (elem.src || (elem.srcset && elem.srcset != "null")) &&
          !elem.className.toLowerCase().includes("lazy")
        ) {
          return;
        }

        for (var j = 0; j < elem.attributes.length; j++) {
          attr = elem.attributes[j];
          if (
            attr.name === "src" ||
            attr.name === "srcset" ||
            attr.name === "alt"
          ) {
            continue;
          }
          var copyTo = null;
          if (/\.(jpg|jpeg|png|webp)\s+\d/.test(attr.value)) {
            copyTo = "srcset";
          } else if (/^\s*\S+\.(jpg|jpeg|png|webp)\S*\s*$/.test(attr.value)) {
            copyTo = "src";
          }
          if (copyTo) {
            //if this is an img or picture, set the attribute directly
            if (elem.tagName === "IMG" || elem.tagName === "PICTURE") {
              elem.setAttribute(copyTo, attr.value);
            } else if (
              elem.tagName === "FIGURE" &&
              !this._getAllNodesWithTag(elem, ["img", "picture"]).length
            ) {
              //if the item is a <figure> that does not contain an image or picture, create one and place it inside the figure
              //see the nytimes-3 testcase for an example
              var img = this._doc.createElement("img");
              img.setAttribute(copyTo, attr.value);
              elem.appendChild(img);
            }
          }
        }
      }