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* Factored out variable invocation tiddlers into separate tiddlers * Document the variable attribute value behavior more completely --------- Co-authored-by: btheado <btheado@mailinator.com>
52 lines
2.0 KiB
Plaintext
52 lines
2.0 KiB
Plaintext
created: 20230726145210484
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modified: 20230726145757234
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tags: [[Variable Usage]]
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title: Behaviour of invoked variables depends on how the variable was declared
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type: text/vnd.tiddlywiki
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\define m1(a1) $a1$ - <<__a1__>> - <<a1>>
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\procedure p1(a1) $a1$ - <<__a1__>> - <<a1>>
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\function f1(a1) "$a1$" "-" [<__a1__>] ="-" [<a1>] :and[join[ ]]
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Invoked in normal wikitext context: `<$transclude $variable=macro/>` or `<<macro>>`
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{{Behaviour of variables invoked via normal wikitext}}
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Invoked via widget attribute: `<div class=<<macro>>/>`
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{{Behaviour of variables invoked via widget attributes}}
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Invoked via filter operator parameter: `[<macro>]`
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{{Behaviour of variables invoked via filter operator parameter}}
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Invoked via function call in a filter expression: `[function[macro]]`
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{{Behaviour of variables invoked via filter expression function call}}
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!! Examples
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Below is an example macro, procedure and function definition. All three forms of parameter substitution `$a1$`, `<<__a1__>>`, and `<<a1>>` are included in each definition. The output helps illustrate when each form of substitution will or will not have affect.
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```
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\define m1(a1) $a1$ - <<__a1__>> - <<a1>>
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\procedure p1(a1) $a1$ - <<__a1__>> - <<a1>>
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\function f1(a1) $a1$ "-" [<__a1__>] ="-" [<a1>] :and[join[ ]]
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```
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| !Variable transclusion|!output |
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| `<<m1 foo>>`|<<m1 foo>>|
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| `<<p1 foo>>`|<<p1 foo>>|
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| `<<f1 foo>>`|<<f1 foo>>|
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| !Widget attribute|!output |
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| `<$text text=<<m1 foo>>/>`|<$text text=<<m1 foo>>/>|
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| `<$text text=<<p1 foo>>/>`|<$text text=<<p1 foo>>/>|
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| `<$text text=<<f1 foo>>/>`|<$text text=<<f1 foo>>/>|
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| !Filter operator parameter|!output |
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| `[<m1 foo>]`|<$text text={{{[<m1 foo>]}}}/>|
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| `[<p1 foo>]`|<$text text={{{[<p1 foo>]}}}/>|
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| `[<f1 foo>]`|<$text text={{{[<f1 foo>]}}}/>|
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| !Function call in filter expression|!output |
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| `[function[m1],[foo]]`|<$text text={{{[function[m1],[foo]]}}}/>|
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| `[function[p1],[foo]]`|<$text text={{{[function[p1],[foo]]}}}/>|
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| `[function[f1],[foo]]`|<$text text={{{[function[f1],[foo]]}}}/>| |