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29 lines
1.2 KiB
Plaintext
29 lines
1.2 KiB
Plaintext
created: 20150124182421000
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modified: 20150124184900000
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tags: [[Filter Syntax]]
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title: Filter Expression
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type: text/vnd.tiddlywiki
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<$railroad text="""
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[{:
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[: [[whitespace|"Filter Whitespace"]] ]
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("+"|:-|"-")
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[[run|"Filter Run"]]
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}]
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"""/>
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A <<.def "filter expression">> is the outermost level of the [[filter syntax|Filter Syntax]]. It consists of one or more [[runs|Filter Run]].
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A run's input 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.
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* If a run has no `+` or `-` prefix, its output titles are [[dominantly appended|Dominant Append]] to the filter's output.
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* If a run has a `-` prefix, its output titles are <<.em removed>> from the filter's output (if they were present).
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* If a run has a `+` prefix, it receives the filter's output so far as its input. The filter's output is then completely <<.em replaced>> by the run's output. Any subsequent run reverts to receiving all tiddler titles as its input, unless it too has a `+` prefix.
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In concise technical terms:
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|!Run |!Interpretation |!Output |
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|`run` |union of sets |... OR run |
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|`+run` |intersection of sets |... AND run |
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|`-run` |difference of sets |... AND NOT run |
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