nl_tokens: main driver for executing each part of the chain
pl_tokens: function advance_exec_cursor ( ) { if ( chain_is_corked ) return ; while ( exec_cursor < chain . length ) { if ( is_func ( chain [ exec_cursor ] ) ) { if ( chain_opts [ _Debug ] ) log_msg ( "$LAB.wait() executing: " + chain [ exec_cursor ] ) ; try { chain [ exec_cursor ++ ] ( ) ; } catch ( err ) { if ( chain_opts [ _Debug ] ) log_error ( "$LAB.wait() error caught: " , err ) ; } continue ; } else if ( ! chain [ exec_cursor ] . finished ) { if ( check_chain_group_scripts_ready ( chain [ exec_cursor ] ) ) continue ; break ; } exec_cursor ++ ; } // we've reached the end of the chain (so far) if ( exec_cursor == chain . length ) { scripts_currently_loading = false ; group = <mask> ; } }