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45 lines
2.4 KiB
Plaintext
45 lines
2.4 KiB
Plaintext
created: 20140410103123179
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modified: 20150917193612610
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tags: Filters
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title: Filter Operators
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type: text/vnd.tiddlywiki
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\define .operator-rows(filter)
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<$list filter="$filter$"><tr>
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<td><$link to={{!!title}}>{{!!caption}}</$link></td>
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<td>{{!!op-purpose}} <$list filter="[all[current]tag[Common Operators]]">{{$:/core/images/done-button}}</$list></td>
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<td align="center"><$list filter="[all[current]tag[Negatable Operators]]">`!`</$list></td>
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</tr></$list>
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\end
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\define .group-heading(_)
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<tr class="doc-table-subheading"><th colspan="3" align="center">$_$</th></tr>
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\end
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A <<.def "filter operator">> is a predefined keyword attached to an individual [[step|Filter Step]] of a [[filter|Filters]]. It defines the particular action of that step.
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The following table lists all the core operators. The commonest ones are checkmarked. The third column indicates which operators allow <$link to="Filter Step">the <code>!</code> prefix</$link> to reverse their meaning.
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<table>
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<tr>
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<th align="left">Operator</th>
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<th align="left">Purpose</th>
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<th align="left">Neg</th>
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</tr>
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<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
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<<.group-heading "Order Operators">>
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<<.operator-rows "[tag[Filter Operators]tag[Order Operators]!tag[Listops Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
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<<.group-heading "Listops Operators">>
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<<.operator-rows "[tag[Filter Operators]tag[Listops Operators]tag[Order Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
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<<.group-heading "String Operators">>
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<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
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<<.group-heading "Tag Operators">>
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<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[String Operators]tag[Tag Operators]!tag[Special Operators]sort[]]">>
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<<.group-heading "Special Operators">>
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<<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[String Operators]!tag[Tag Operators]tag[Special Operators]sort[]]">>
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</table>
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A typical step is written as `[operator[parameter]]`, although not all of the operators need a [[parameter|Filter Parameter]].
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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. For the exact rules, see [[Filter Syntax]].
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