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Code Issues Releases Wiki Activity

Updated Filter docs for named filter run prefixes (#4917)

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saqimtiaz 2020-10-27 17:49:56 +01:00 committed by GitHub
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editions/tw5.com/tiddlers/filters/syntax/Filter Expression.tid
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@ -1,5 +1,5 @@
created: 20150124182421000
modified: 20190610165329062
modified: 20201027134811701
tags: [[Filter Syntax]]
title: Filter Expression
type: text/vnd.tiddlywiki
@ -21,15 +21,16 @@ If a run has:
* the prefix `-`, output titles are <<.em removed>> from the filter's output (if such tiddlers exist)
* the prefix `+`, it receives the filter output so far as its input; its output then <<.em "replaces">> all filter ouput so far and forms the input for the next run
* <<.from-version "5.1.18">> the prefix `~`, if the filter output so far is an empty list then the output titles of the run are [[dominantly appended|Dominant Append]] to the filter's output. If the filter output so far is not an empty list then the run is ignored
* <<.from-version "5.1.23">> named prefixes for filter runs are available.
In technical / logical terms:
|!Run |!Interpretation |!Output |
|`run` |de-duplicated union of sets |... OR run |
|`=run` |union of sets without de-duplication |... OR run |
|`+run` |intersection of sets |... AND run |
|`-run` |difference of sets |... AND NOT run |
|`~run` |else |... ELSE run |
|!Run |!Equivalent named prefix |!Interpretation |!Output |
|`run` |`:or[run]` |de-duplicated union of sets |... OR run |
|`=run` |`:all[run]` |union of sets without de-duplication |... OR run |
|`+run` |`:and[run]` |intersection of sets |... AND run |
|`-run` |`:except[run]` |difference of sets |... AND NOT run |
|`~run` |`:else[run]` |else |... ELSE run |
The input of a run is normally a list of all the non-[[shadow|ShadowTiddlers]] tiddler titles in the wiki (in no particular order). But the `+` prefix can change this: