forward-subphrase-with-optionals

This command is also known as forward-with-optionals. Suppose invocation of forward-subphrase-with-optionals does not initiate a successful parse (e.g., because auto-parse mode is off, or the current selection is not a text buffer, or the text buffer has not been modified since the last attempt to parse it, or parsing fails). Then forward-subphrase-with-optionals changes the structural selection to the next resting place in a forward preorder traversal of the abstract-syntax tree starting from the current structural selection, stopping at placeholders for optional constituents.

If invocation of forward-subphrase-with-optionals initiates a successful parse, then advance-after-parse is invoked to advance the structural selection.

The command is parser-initiating.