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Merge pull request #992 from Eucaly/variables

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add Subsitutions in WikiText
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Jeremy Ruston 2014-10-18 18:57:13 +01:00
commit 3305874235
2 changed files with 55 additions and 2 deletions
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editions/tw5.com/tiddlers/wikitext/Variables in WikiText.tid
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caption: Variables
created: 20141002141231992
modified: 20141002230751664
modified: 20141018104313995
tags: WikiText
title: Variables in WikiText
type: text/vnd.tiddlywiki
@ -25,4 +25,4 @@ Variables are used in:
* [[Filter expression|Introduction to Filters]] `[operator<variable-operand>]`
* Some default behaviors of [[Widgets]]
See also [[currentTiddler|WidgetVariable: currentTiddler]] variable and built-in [[variables|Variables]].
See also [[currentTiddler|WidgetVariable: currentTiddler]] variable, built-in [[variables|Variables]] and [[subsitutions in WikiText|Variables, Macros and Subsitutions in WikiText]]

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editions/tw5.com/tiddlers/wikitext/Variables, Macros and Subsitutions in WikiText.tid Normal file
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caption: Variables, Parameters, Subsitutions
created: 20141018090608643
modified: 20141018104201050
tags: WikiText
title: Variables, Macros and Subsitutions in WikiText
type: text/vnd.tiddlywiki
! Syntax for Attributes
The syntax for the attributes of [[HTML elements|HTML in WikiText]] and [[widgets|Widgets in WikiText]]:
* `"text"` or `'text'` - passed as a literal value
* `{{text reference}}` - [[transcludes|Transclusion in WikiText]] a text reference
* `<<macro>>` - transcludes a variable or macro invocation.
! Syntax for Filter
Using single brace `{...}` and `<...>` when referenced as operands in [[Filter expression|Introduction to Filters]].
* Text reference as `[search{$:/temp/search}]` or `[prefix{tiddlerA!!fieldname}]`
* Variable reference as `[search<currentTiddler>]`
! Variables and Macros
[[Variables|Variables in WikiText]] and [[macros|Macros in WikiText]] are indeed the same thing. Macros are just variables that have their parameters substituted before use.
! Textual Substitution
* `$parametername$` - for [[macor parameters|Macros in WikiText]]
```
\define mysamplemacro(name:"Bugs Bunny",address:"Rabbit Hole Hill")
Hi, I'm $name$ and I live in $address$
\end
```
* `$(variablename)$` - for variable substitutions ''within macros''
```
\define mysamplemacro2()
Hi, I'm $(name)$ and I live in $(address)$
\end
<$set name="name" value="Bugs Bunny">
<$set name="address" value="Rabbit Hole Hill">
<<mysamplemacro2>>
</$set></$set>
```
The differents between textual substitution and other syntax:
* Textual substitution is performed before the macro is parsed, the values are inserted into the target.
* While the `<<...>>` syntax is a transclusion, where the "WikiText" is inserted and rendered separately.
* Textual substitution behaves as text. So that they can be combined with other text, and the usage should include all braces like :
** `filter="[prefix[$:/$(a)$/$(b)$]]"` or
** `<$reveal ... text="$(c)$"> `