Différences
Ci-dessous, les différences entre deux révisions de la page.
| Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente Prochaine révision Les deux révisions suivantes | ||
|
2_programmation:macros:definir_une_macro_a_plus_de_9_arguments [2018/05/23 18:48] joseph.wright |
2_programmation:macros:definir_une_macro_a_plus_de_9_arguments [2018/12/02 23:41] jejust |
||
|---|---|---|---|
| Ligne 1: | Ligne 1: | ||
| - | --- | + | ====== How to break the 9-argument limit ====== |
| - | ID: Q-moren9 | + | |
| - | revised: 2014-06-10 | + | |
| - | --- | + | |
| - | # How to break the 9-argument limit | + | |
| If you think about it, you will realise that Knuth's command | If you think about it, you will realise that Knuth's command | ||
| definition syntax: | definition syntax: | ||
| - | ```latex | + | |
| + | <code latex> | ||
| \def\blah#1#2 ... #9{<macro body>} | \def\blah#1#2 ... #9{<macro body>} | ||
| - | ``` | + | </code> |
| is intrinsically limited to just 9 arguments. There's no direct way | is intrinsically limited to just 9 arguments. There's no direct way | ||
| - | round this: how would you express a 10th argument? — and ensure that | + | round this: how would you express a 10th argument? --- and ensure that |
| the syntax didn't gobble some other valid usage? | the syntax didn't gobble some other valid usage? | ||
| If you really must have more than 9 arguments, the way to go is: | If you really must have more than 9 arguments, the way to go is: | ||
| - | <!-- {% raw %} --> | + | |
| - | ```latex | + | |
| + | <code latex> | ||
| \def\blah#1#2 ... #9{% | \def\blah#1#2 ... #9{% | ||
| \def\ArgI{{#1}}% | \def\ArgI{{#1}}% | ||
| Ligne 31: | Ligne 30: | ||
| <macro body>% | <macro body>% | ||
| } | } | ||
| - | ``` | + | </code> |
| - | <!-- {% endraw %} --> | + | |
| This technique is easily extendible by concert pianists of the TeX | This technique is easily extendible by concert pianists of the TeX | ||
| keyboard, but is really hard to recommend. | keyboard, but is really hard to recommend. | ||
| LaTeX users have the small convenience of merely giving a number of | LaTeX users have the small convenience of merely giving a number of | ||
| - | arguments in the `\newcommand` that defines each part of the | + | arguments in the ''\newcommand'' that defines each part of the |
| - | relaying mechanism: Knuth's restriction applies to `\newcommand` | + | relaying mechanism: Knuth's restriction applies to ''\newcommand'' |
| - | just as it does to `\def`. However, LaTeX users also have the | + | just as it does to ''\def''. However, LaTeX users also have the |
| - | way out of such barbarous command syntax: the [`keyval`](https://ctan.org/pkg/keyval) | + | way out of such barbarous command syntax: the [[ctanpkg>keyval|keyval]] |
| - | package. With [`keyval`](https://ctan.org/pkg/keyval), and a bit of programming, one can | + | package. With [[ctanpkg>keyval|keyval]], and a bit of programming, one can |
| write really quite sophisticated commands, whose invocation might look | write really quite sophisticated commands, whose invocation might look | ||
| like: | like: | ||
| - | <!-- {% raw %} --> | + | |
| - | ```latex | + | |
| + | <code latex> | ||
| \flowerinstance{species=Primula veris, | \flowerinstance{species=Primula veris, | ||
| family=Primulaceae, | family=Primulaceae, | ||
| Ligne 54: | Ligne 54: | ||
| soiltype=alkaline | soiltype=alkaline | ||
| } | } | ||
| - | ``` | + | </code> |
| - | <!-- {% endraw %} --> | + | |
| The merit of such verbosity is that it is self-explanatory: the typist | The merit of such verbosity is that it is self-explanatory: the typist | ||
| - | doesn't have to remember that argument twelve is `soiltype`, and so | + | doesn't have to remember that argument twelve is ''soiltype'', and so |
| on: the commands may be copied from field notes quickly and | on: the commands may be copied from field notes quickly and | ||
| accurately. | accurately. | ||
| - | * faq-mac-prog.tex (q-keyval): tweak words about getoptk | ||
| + | |||
| + | --- | ||
| + | |||
| + | //Source:// [[faquk>FAQ-moren9|How to break the 9-argument limit]] | ||
| + | |||
| + | {{htmlmetatags>metatag-keywords=(LaTeX,programming) | ||
| + | metatag-og:title=(How to break the 9-argument limit) | ||
| + | metatag-og:site_name=(FAQ LaTeX francophone) | ||
| + | }} | ||
