Function replaceForPosition

src/assets/font-awesome/js/all.js:13531–13631

(node, position)

  }

  function replaceForPosition(node, position) {
    var pendingAttribute = ""
      .concat(DATA_FA_PSEUDO_ELEMENT_PENDING)
      .concat(position.replace(":", "-"));
    return new picked(function (resolve, reject) {
      if (node.getAttribute(pendingAttribute) !== null) {
        // This node is already being processed
        return resolve();
      }

      var children = toArray(node.children);
      var alreadyProcessedPseudoElement = children.filter(function (c) {
        return c.getAttribute(DATA_FA_PSEUDO_ELEMENT) === position;
      })[0];
      var styles = WINDOW.getComputedStyle(node, position);
      var fontFamily = styles
        .getPropertyValue("font-family")
        .match(FONT_FAMILY_PATTERN);
      var fontWeight = styles.getPropertyValue("font-weight");

      if (alreadyProcessedPseudoElement && !fontFamily) {
        // If we've already processed it but the current computed style does not result in a font-family,
        // that probably means that a class name that was previously present to make the icon has been
        // removed. So we now should delete the icon.
        node.removeChild(alreadyProcessedPseudoElement);
        return resolve();
      } else if (fontFamily) {
        var content = styles.getPropertyValue("content");
        var prefix = ~[
          "Solid",
          "Regular",
          "Light",
          "Duotone",
          "Brands",
        ].indexOf(fontFamily[1])
          ? STYLE_TO_PREFIX[fontFamily[1].toLowerCase()]
          : FONT_WEIGHT_TO_PREFIX[fontWeight];
        var hexValue = toHex(
          content.length === 3 ? content.substr(1, 1) : content
        );
        var iconName = byUnicode(prefix, hexValue);
        var iconIdentifier = iconName; // Only convert the pseudo element in this :before/:after position into an icon if we haven't
        // already done so with the same prefix and iconName

        if (
          iconName &&
          (!alreadyProcessedPseudoElement ||
            alreadyProcessedPseudoElement.getAttribute(DATA_PREFIX) !==
              prefix ||
            alreadyProcessedPseudoElement.getAttribute(DATA_ICON) !==
              iconIdentifier)
        ) {
          node.setAttribute(pendingAttribute, iconIdentifier);

          if (alreadyProcessedPseudoElement) {
            // Delete the old one, since we're replacing it with a new one
            node.removeChild(alreadyProcessedPseudoElement);
          }