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+%% start of file `collection.sty'.

+%% Copyright 2013-2013 Xavier Danaux (xdanaux@gmail.com).

+%

+% This work may be distributed and/or modified under the

+% conditions of the LaTeX Project Public License version 1.3c,

+% available at http://www.latex-project.org/lppl/.

+

+

+%-------------------------------------------------------------------------------

+%                identification

+%-------------------------------------------------------------------------------

+\NeedsTeXFormat{LaTeX2e}

+\ProvidesPackage{collection}[2013/03/28 v1.0.0 collections]

+

+

+%-------------------------------------------------------------------------------

+%                requirements

+%-------------------------------------------------------------------------------

+

+

+\RequirePackage{ifthen}

+

+

+%-------------------------------------------------------------------------------

+%                code

+%-------------------------------------------------------------------------------

+

+% creates a new collection

+% usage: \collectionnew{<collection name>}

+\newcommand*{\collectionnew}[1]{%

+  \newcounter{collection@#1@count}}

+

+% adds an item to a collection

+% usage: \collectionadd[<optional key>]{<collection name>}{<item to add>}

+\newcommand*{\collectionadd}[3][]{%

+  \expandafter\def\csname collection@#2@item\roman{collection@#2@count}\endcsname{#3}%

+  \if\relax\noexpand#1\relax% if #1 is empty

+    \else\expandafter\def\csname collection@#2@key\roman{collection@#2@count}\endcsname{#1}\fi%

+  \stepcounter{collection@#2@count}}

+

+% returns the number of items in a collection

+% usage: \collectioncount{<collection name>}

+\newcommand*{\collectioncount}[1]{%

+  \value{collection@#1@count}}

+

+% gets an item from a collection

+% usage: \collectiongetitem{<collection name>}{<element id>}

+% where <element id> is an integer between 0 and (collectioncount-1)

+\newcommand*{\collectiongetitem}[2]{%

+  \csname collection@#1@item\romannumeral #2\endcsname}

+

+% gets a key from a collection

+% usage: \collectiongetkey{<collection name>}{<element id>}

+% where <element id> is an integer between 0 and (collectioncount-1)

+\newcommand*{\collectiongetkey}[2]{%

+  \csname collection@#1@key\romannumeral #2\endcsname}

+

+% loops through a collection and perform the given operation on every element

+% usage: \collectionloop{<collection name>}{<operation sequence>}

+% where <operation sequence> is the code sequence to be evaluated for each collection item,

+%   code which can refer to \collectionloopid, \collectionloopkey, \collectionloopitem and

+%   \collectionloopbreak

+\newcounter{collection@iterator}

+\newcommand*{\collectionloopbreak}{\let\iterate\relax}

+\newcommand*{\collectionloop}[2]{%

+  \setcounter{collection@iterator}{0}%

+  \loop\ifnum\value{collection@iterator}<\value{collection@#1@count}%

+    \def\collectionloopid{\arabic{collection@iterator}}%

+    \def\collectionloopitem{\collectiongetitem{#1}{\collectionloopid}}%

+    \def\collectionloopkey{\collectiongetkey{#1}{\collectionloopid}}%

+    #2%

+    \stepcounter{collection@iterator}%

+    \repeat}

+

+% loops through a collection and finds the (first) element matching the given key

+% usage: \collectionfindbykey{<collection name>}{key>}

+\newcommand*{\collectionfindbykey}[2]{%

+  \collectionloop{#1}{%

+    \ifthenelse{\equal{\collectionloopkey}{#2}}{\collectionloopitem\collectionloopbreak}{}}}

+

+

+\endinput

+

+

+%% end of file `collection.cls'.