54 lines
3.5 KiB
Plaintext
54 lines
3.5 KiB
Plaintext
created: 20140410103123179
|
|
modified: 20211217141224284
|
|
tags: Filters
|
|
title: Filter Operators
|
|
type: text/vnd.tiddlywiki
|
|
|
|
\define .operator-rows(filter)
|
|
<$list filter="$filter$"><tr>
|
|
<td><$link>{{!!caption}}</$link></td>
|
|
<td>{{!!op-purpose}}</td>
|
|
<td align="center"><$list filter="[all[current]tag[Common Operators]]">✓</$list></td>
|
|
<td align="center"><$list filter="[all[current]tag[Negatable Operators]]">`!`</$list></td>
|
|
<td align="center"><$list filter="[all[current]tag[Selection Constructors]!tag[Selection Constructors: Conditional]]">`C`</$list><$list filter="[all[current]tag[Selection Constructors]tag[Selection Constructors: Conditional]]">`C?`</$list></td>
|
|
</tr></$list>
|
|
\end
|
|
|
|
\define .group-heading(_)
|
|
<tr class="doc-table-subheading"><th colspan="5" align="center">$_$</th></tr>
|
|
\end
|
|
|
|
A <<.def "filter operator">> is a predefined keyword attached to an individual [[step|Filter Step]] of a [[filter|Filters]]. It defines the particular action of that step.
|
|
|
|
''Important:'' Each first [[step|Filter Step]] of a [[filter run|Filter Run]] not given any input titles receives the output of <$link to="all Operator">[all[tiddlers]]</$link> as its input.
|
|
|
|
The following table lists all core operators, the most common ones marked ✓. The `!` column indicates whether an operator allows ''negation'' using the <$link to="Filter Step"><code>!</code> prefix</$link>. For specifics as to each operator's negated output please refer to its documentation.
|
|
|
|
Most steps process the [[selection of titles|Title Selection]] that are supplied as their input, but a few [[construct an entirely new selection|Selection Constructors]] instead, as indicated by the last column. A `C?` indicates it might construct a new selection, depending on usage. For specifics as to each operator's selection creation please refer to its documentation.
|
|
|
|
<table>
|
|
<tr>
|
|
<th align="left">Operator</th>
|
|
<th align="left">Purpose</th>
|
|
<th align="center">✓</th>
|
|
<th align="center">`!`</th>
|
|
<th align="center">`C`</th>
|
|
</tr>
|
|
<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[Mathematics Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
|
|
<<.group-heading "Order Operators">>
|
|
<<.operator-rows "[tag[Filter Operators]tag[Order Operators]!tag[Listops Operators]!tag[Mathematics Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
|
|
<<.group-heading "Listops Operators">>
|
|
<<.operator-rows "[tag[Filter Operators]tag[Listops Operators]tag[Order Operators]!tag[Mathematics Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
|
|
<<.group-heading "String Operators">>
|
|
<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
|
|
<<.group-heading "Mathematics Operators">>
|
|
<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]tag[Mathematics Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
|
|
<<.group-heading "Tag Operators">>
|
|
<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[Mathematics Operators]!tag[String Operators]tag[Tag Operators]!tag[Special Operators]sort[]]">>
|
|
<<.group-heading "Special Operators">>
|
|
<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[Mathematics Operators]!tag[String Operators]!tag[Tag Operators]tag[Special Operators]sort[]]">>
|
|
</table>
|
|
|
|
A typical step is written as `[operator[parameter]]`, although not all of the operators need a [[parameter|Filter Parameter]].
|
|
|
|
For the exact rules, see [[Filter Syntax]]. |