diff options
| -rw-r--r-- | luatexbase-mcb.dtx | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/luatexbase-mcb.dtx b/luatexbase-mcb.dtx index 557f41d..532cfbb 100644 --- a/luatexbase-mcb.dtx +++ b/luatexbase-mcb.dtx @@ -925,6 +925,39 @@ luatexbase.is_active_callback = function (name, description) end % \end{macrocode} % +% |callback_descriptions| returns a table containing all +% descriptions of the functions registered for a given callback in +% the order of their priority. +% +% The function raises an error if the callback name is missing or +% invalid. +% If there is no function registered for the callback, an empty +% table is returned. +% +% \begin{macrocode} +--- string -> string list option +luatexbase.callback_descriptions = function (name) + if not name then + err ("unable to check for callback:\nno proper name passed") + return + elseif not callbacktypes [name] then + err ("unable to check for callback %q:\nis not a valid callback", name) + return + end + local lst = callbacklist [name] + local registered = { } + if lst then + for i = 1, #lst do + local itm = lst [i] + if i then + registered [i] = itm.description + end + end + end + return registered +end +% \end{macrocode} +% % That's all folks! % % \begin{macrocode} |