called by widget

* @brief Set options for the file reader. * @param options The options, each reader chooses how to use/interpret them. */

* Set whether this format supports read and/or write operations. */

* Vertical alignment of the text. */

* @return The spacing of the grid. */

Strip any leading non-JSON output (e.g. deprecation warnings printed to stdout by third-party libraries). Find the first '{' or '['.

* Get the number of vertices. */