Method _splitIconName

src/material/icon/icon.ts:274–287

* Splits an svgIcon binding value into its icon set and icon name components. * Returns a 2-element array of [(icon set), (icon name)]. * The separator for the two fields is ':'. If there is no separator, an empty * string is returned for the icon set and the entire value is returned for

(iconName: string)

   *   'a:b:c' -> (throws Error)`
   */
  private _splitIconName(iconName: string): [string, string] {
    if (!iconName) {
      return ['', ''];
    }
    const parts = iconName.split(':');
    switch (parts.length) {
      case 1:
        return ['', parts[0]]; // Use default namespace.
      case 2:
        return <[string, string]>parts;
      default:
        throw Error(`Invalid icon name: "${iconName}"`); // TODO: add an ngDevMode check
    }
  }

  ngOnInit() {
    // Update font classes because ngOnChanges won't be called if none of the inputs are present,