Bug reports can be opened category tools at httplatexprojectorgbugshtml Abstract This package gives the enumerate environment an optional argument which determines the style in which the counter is printed An occurrence of one of the tokens A a I i ID: 83832
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TheenumeratepackageDavidCarlisle2015/07/23 ThisleismaintainedbytheLATEXProjectteam.Bugreportscanbeopened(categorytools)athttps://latex-project.org/bugs.html. AbstractThispackagegivestheenumerateenvironmentanoptionalargumentwhichdeterminesthestyleinwhichthecounterisprinted.AnoccurrenceofoneofthetokensAaIior1producesthevalueofthecounterprintedwith(respectively)\Alph\alph\Roman\romanor\arabic.TheselettersmaybesurroundedbyanystringsinvolvinganyotherTEXexpressions,howeverthetokensAaIi1mustbeinsidea{}groupiftheyarenottobetakenasspecial.1ExamplesEXi.oneoneoneoneoneoneoneoneoneoneoneoneEXii.twoexamplea)oneoftwooneoftwooneoftwoexampleb)twooftwoA-1oneA-2two\begin{enumerate}[EXi.]\itemoneoneoneoneoneoneoneoneoneoneone\label{LA}\itemtwo\begin{enumerate}[{example}a)]\itemoneoftwooneoftwooneoftwo\label{LB}\itemtwooftwo\end{enumerate}\end{enumerate}\begin{enumerate}[{A}-1]\itemone\label{LC}\itemtwo\end{enumerate}\labeland\refmaybeusedaswiththestandardenumerateenvironment.\refonlyproducesthecountervalue,notthewholelabel.\refprintsthevalue Thislehasversionnumberv3.00,lastrevised2015/07/23.1 inthesamestyleas\item,asdeterminedbythepresenceofoneofthetokensAaIi1intheoptionalargument.Intheaboveexample\ref{LA},\ref{LB}and\ref{LC}produce`i',`iia'and`1'respectively.2Macros1h*packagei\@enlabInternaltokenregisterusedtobuildupthelabelcommandfromtheoptionalargument.2\newtoks\@enLab\@enQmarkThisjustexpandstoa`?'.\refwillproducethis,ifnocounterisprinted.3\def\@enQmark{?}Thenextfourmacrosbuildupthecommandthatwillprinttheitemlabel.Theyeachgobbleonetokenorgroupfromtheoptionalargument,andaddcorre-spondingtokenstotheregister\@enLab.Theyeachendwithacallto\@enloop,whichstartstheprocessingofthenexttoken.\@enLabelAddthecountertothelabel.#2willbeoneofthe`special'tokensAaIi1,andisthrownaway.#1willbeacommandlike\Roman.4\def\@enLabel#1#2{%5\edef\@enThe{\noexpand#1{\@enumctr}}%6\@enLab\expandafter{\the\@enLab\csnamethe\@enumctr\endcsname}%7\@enloop}\@enSpace\@enSp@ceAddaspacetothelabel.Thetrickybitistogobblethespacetoken,asyoucannotdothiswithamacroargument.8\def\@enSpace{\afterassignment\@enSp@ce\let\@tempa=}9\def\@enSp@ce{\@enLab\expandafter{\the\@enLab\space}\@enloop}\@enGroupAdda{}grouptothelabel.10\def\@enGroup#1{\@enLab\expandafter{\the\@enLab{#1}}\@enloop}\@enOtherAddanythingelsetothelabel11\def\@enOther#1{\@enLab\expandafter{\the\@enLab#1}\@enloop}\@enloop\@enloop@Thebodyofthemainloop.Eatingtokensthiswayinsteadofusing\@tforletsyouseespacesandallbraces.\@tforwouldtreataand{a}asspecial,butnot{{a}}.12\def\@enloop{\futurelet\@entemp\@enloop@}13\def\@enloop@{%14\ifxA\@entemp\def\@tempa{\@enLabel\Alph}\else15\ifxa\@entemp\def\@tempa{\@enLabel\alph}\else16\ifxi\@entemp\def\@tempa{\@enLabel\roman}\else17\ifxI\@entemp\def\@tempa{\@enLabel\Roman}\else18\ifx1\@entemp\def\@tempa{\@enLabel\arabic}\else19\ifx\@sptoken\@entemp\let\@tempa\@enSpace\else20\ifx\bgroup\@entemp\let\@tempa\@enGroup\else21\ifx\@enum@\@entemp\let\@tempa\@gobble\else22\let\@tempa\@enOther2 Hookforpossibleextensions23\@enhook24\fi\fi\fi\fi\fi\fi\fi\fiProcessthecurrenttoken,thenlookatthenext.25\@tempa}\@enhookHookforpossibleextensions.Somepackagesmaywanttoextendthenumberofspecialcharactersthatareassociatedwithcounterrepresentations.ThisfeaturewasrequestedtoenableRussianalphabeticcounting,buthereIgiveanexampleofafootnotesymbolcounter,triggeredby*.Toenableanewcountertypebasedonaletter,youjustneedtoaddanew\ifxclausebyanalogywiththecodeabove.Soforexampletomake*triggerfootnotesymbolcounting.apackageshoulddothefollowing.Initialisethehook,incasethepackageisloadedbeforeenumerate.\providecommand\@enhook{}Addtothehookanew\ifxclausethatassociates*withthe\fnsymbolcountercommand.\g@addto@macro\@enhook{%\ifx*\@entemp\def\@tempa{\@enLabel\fnsymbol}%\fi}Thiscodesequenceshouldworkwhetheritisloadedbeforeorafterthisenumeratepackage.Anynumberofnewcountertypesmaybeaddedinthisway.Atthispointwejustneedinitialisethehook,takingcarenottooverwriteanydenitionsanotherpackagemayalreadyhaveadded.26\providecommand\@enhook{}\enumerateThenewenumerateenvironment.Thisisthersthalfoftheoriginalenumer-ateenvironment.Ifthereisanoptionalargument,call\@@enum@todenethelabelcommands,otherwisecall\@enum@whichisthesecondhalfoftheoriginaldenition.27\def\enumerate{%28\ifnum\@enumdepth�3\@toodeep\else29\advance\@enumdepth\@ne30\edef\@enumctr{enum\romannumeral\the\@enumdepth}\fi31\@ifnextchar[{\@@enum@}{\@enum@}}\@@enum@Handletheoptionalargument..32\def\@@enum@[#1]{%Initialisetheloopwhichwillbreakaparttheoptionalargument.Thecommandtoprintthelabelisbuiltupin\@enlab.\@enThewillbeusedtodene\theenumn.33\@enLab{}\let\@enThe\@enQmarkThe\@enum@belowisneverexpanded,itisusedtodetecttheendofthetokenlist.34\@enloop#1\@enum@3 Issueawarningifwedidnotndoneofthe`special'tokens.35\ifx\@enThe\@enQmark\@warning{Thecounterwillnotbeprinted.%36^^J\space\@spaces\@spaces\@spacesThelabelis:\the\@enLab}\fiDene\labelenumnand\theenumn.37\expandafter\edef\csnamelabel\@enumctr\endcsname{\the\@enLab}%38\expandafter\let\csnamethe\@enumctr\endcsname\@enTheSetthecounterto7sothatwegetthewidthof`vii'ifromannumberingisinforcethenset\leftmarginn.tothewidthofthelabelplus\labelsep.39\csnamec@\@enumctr\endcsname740\expandafter\settowidth41\csnameleftmargin\romannumeral\@enumdepth\endcsname42{\the\@enLab\hspace{\labelsep}}%Finallycall\@enum@whichisthesecondhalfoftheoriginaldenition.43\@enum@}\@enum@Allthelistparametershavenowbeendened,socall\list.Thisistakenstraightfromtheoriginaldenitionof\enumerate.44\def\@enum@{\list{\csnamelabel\@enumctr\endcsname}%45{\usecounter{\@enumctr}\def\makelabel##1{\hss\llap{##1}}}}46h=packagei4