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86 lines
3.4 KiB
86 lines
3.4 KiB
%% start of file `collection.sty'.
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%% Copyright 2013-2013 Xavier Danaux (xdanaux@gmail.com).
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%
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% This work may be distributed and/or modified under the
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% conditions of the LaTeX Project Public License version 1.3c,
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% available at http://www.latex-project.org/lppl/.
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%-------------------------------------------------------------------------------
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% identification
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%-------------------------------------------------------------------------------
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\NeedsTeXFormat{LaTeX2e}
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\ProvidesPackage{collection}[2013/03/28 v1.0.0 collections]
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%-------------------------------------------------------------------------------
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% requirements
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%-------------------------------------------------------------------------------
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\RequirePackage{ifthen}
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%-------------------------------------------------------------------------------
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% code
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%-------------------------------------------------------------------------------
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% creates a new collection
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% usage: \collectionnew{<collection name>}
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\newcommand*{\collectionnew}[1]{%
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\newcounter{collection@#1@count}}
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% adds an item to a collection
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% usage: \collectionadd[<optional key>]{<collection name>}{<item to add>}
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\newcommand*{\collectionadd}[3][]{%
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\expandafter\def\csname collection@#2@item\roman{collection@#2@count}\endcsname{#3}%
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\if\relax\noexpand#1\relax% if #1 is empty
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\else\expandafter\def\csname collection@#2@key\roman{collection@#2@count}\endcsname{#1}\fi%
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\stepcounter{collection@#2@count}}
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% returns the number of items in a collection
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% usage: \collectioncount{<collection name>}
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\newcommand*{\collectioncount}[1]{%
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\value{collection@#1@count}}
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% gets an item from a collection
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% usage: \collectiongetitem{<collection name>}{<element id>}
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% where <element id> is an integer between 0 and (collectioncount-1)
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\newcommand*{\collectiongetitem}[2]{%
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\csname collection@#1@item\romannumeral #2\endcsname}
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% gets a key from a collection
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% usage: \collectiongetkey{<collection name>}{<element id>}
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% where <element id> is an integer between 0 and (collectioncount-1)
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\newcommand*{\collectiongetkey}[2]{%
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\csname collection@#1@key\romannumeral #2\endcsname}
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% loops through a collection and perform the given operation on every element
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% usage: \collectionloop{<collection name>}{<operation sequence>}
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% where <operation sequence> is the code sequence to be evaluated for each collection item,
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% code which can refer to \collectionloopid, \collectionloopkey, \collectionloopitem and
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% \collectionloopbreak
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\newcounter{collection@iterator}
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\newcommand*{\collectionloopbreak}{\let\iterate\relax}
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\newcommand*{\collectionloop}[2]{%
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\setcounter{collection@iterator}{0}%
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\loop\ifnum\value{collection@iterator}<\value{collection@#1@count}%
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\def\collectionloopid{\arabic{collection@iterator}}%
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\def\collectionloopitem{\collectiongetitem{#1}{\collectionloopid}}%
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\def\collectionloopkey{\collectiongetkey{#1}{\collectionloopid}}%
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#2%
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\stepcounter{collection@iterator}%
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\repeat}
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% loops through a collection and finds the (first) element matching the given key
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% usage: \collectionfindbykey{<collection name>}{key>}
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\newcommand*{\collectionfindbykey}[2]{%
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\collectionloop{#1}{%
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\ifthenelse{\equal{\collectionloopkey}{#2}}{\collectionloopitem\collectionloopbreak}{}}}
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\endinput
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%% end of file `collection.cls'.
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