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 Re: \leavevmode? Ulrike Fischer <[log in to unmask]> Mon, 2 Jan 2012 16:57:17 +0100 text/plain (50 lines) Am Mon, 2 Jan 2012 14:27:52 +0000 schrieb Joseph Wright: >> Well I thought about   >> \hbox_unpack_clear:N\c_empty_box > >> (as the documentation of source3 says that \hbox_unpack_clear:N is >> \unhbox). >> >> And as I can see l3galley uses >> >> \tex_unhbox:D \c_empty_box. >> >> Is there any real difference between the three variants? > > Must be an older version of l3galley: that version is not in the SVN. > > As you say, \hbox_unpack_clear:N = \unhbox while \hbox_unpack:N = > \unhcopy. I'd prefer the latter as nothing should be modifying a > constant (\c_...), even though here it would make no difference. OK this sound convincing. I will use \hbox_unpack:N. >> And is the name in l3galley "\galley_leave_vmode:" stable? I would >> prefer a standard command instead of my own local >> \leavemode-command. \leavemode is imho such a central concept that >> it should have a standard name. > > There are two slightly separate concepts here (I think - Frank may > correct me). One is the need in the galley mode to leave vertical mode, > and the other is the more general case of 'some arbitrary command'. The > galley has to work a particular way, and it therefore may on occasion do > it's own thing. So I suspect that \galley_... is not the right place for > a general 'ensure we are not in vertical mode' function. > > That leaves the question of where /is/ the right place. One obvious > suggestion is \mode_leave_vertical: or \mode_ensure_not_vertical: (the > latter is a bit awkward if more accurate). The first location where I searched for mode-switching commands was l3prg. But it only contained command to check the mode, not to switch it. (Imho beside \leavevmode also a variant of \@ensuredmath would be a good idea.) -- Ulrike Fischer