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* Improve Filter Syntax documentaion / navigation * update links and missing diagrams * rename legacy prefix to shortcut prefix * Update editions/tw5.com/tiddlers/filters/Filter Operators.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Cascade Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * add most changes a suggested by yaisog * fix copy / paste from-version * replace operand with parameter in the docs * fix typo * fix typos and improve railroad diagrams consistency * move "new from version" info for filter run prefixes below the table * fix typo transclusion and substitution * Move Filters tiddler to the top level in the TOC * wip-breadcrumbs * breadcrumbs & breadcrumbsList macro final * remove files that do not belong to this PR * restore release banner * add simple / story mode to breadcrumbs * .breadcrumbs macro update comments * new breadcrumbs CSS, woks with small screens * make CSS configurable using hidden-settings * improve CSS fro small screens * remove the initial: recursiveParentTag macro * improve location info for breadcrumbs nav. add "alt-text" for Edge ::after element * breadcrumbs add mode=field * bc add initial docs * breadcrumbsField will also respect the story ordering * add configurable global filterMode setting * improve arrow CSS for browser zooming * add bc links use bc-caption if caption field is non-empty * breadcrumbs improve comments * breadcrumbs aria-lable uses caption if there is one * breadcrumbs improve documentation * breadcrumbs improve docs for sort param * fix showArrows docs * remove .bc-link aria-label .. it's not needed if caption is resolved properly * use subfilter instead of enlist to evaluate the "excluded" variable. Be consistent with toc-macros * remove breadcrumbs macros - they have their own PR now * resolve conflict * add back doc-macros tiddler * integrate :then filter run prefix * remove .breadcrumbs macros and their config tiddlers * fix typos as requested --------- Co-authored-by: yaisog <m@rcuswinter.de>
39 lines
1.7 KiB
Plaintext
39 lines
1.7 KiB
Plaintext
created: 20210618133745003
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from-version: 5.3.0
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modified: 20230710074225410
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rp-input: <<.olink all>> tiddler titles
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rp-output: the output of this filter run replaces the output of previous runs unless it is an empty list (see below)
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rp-purpose: replace any input to this filter run with its output, only evaluating the run when there is any input
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search:
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tags: [[Named Filter Run Prefix]]
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title: Then Filter Run Prefix
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type: text/vnd.tiddlywiki
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<$railroad text="""
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\start none
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\end none
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":then"
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[[run|"Filter Run"]]
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"""/>
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The <<.op :then>> filter run prefix is used to replace the result of all previous filter runs with its output.
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If the result of all previous runs is an empty list, the <<.op :then>> prefixed filter run is not evaluated.
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If the output of a <<.op :then>> prefixed filter run is itself an empty list, the result of all previous filter runs is passed through unaltered.
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<<.tip "Note that a list with a single empty string item is not an empty list.">>
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!! <<.op :then>> run prefix versus the <<.olink then>> operator
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The major difference between the <<.op then>> operator and a <<.op :then>> prefixed filter run is that the operator will replace //each item// of the input [[Title List]] with its parameter while <<.op :then>> will replace the //whole input list// with the result of its run.
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|doc-op-comparison tc-center|k
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| !<<.op :then>> Filter Run Prefix | !<<.op then>> Operator |
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|^<<.operator-example m1-1 "[tag[WikiText]] :then[[true]]">>|^<<.operator-example m1-2 "[tag[WikiText]then[true]]">><p>To make them equivalent, additional filter steps may be added:</p> <<.operator-example m1-3 "[tag[WikiText]count[]compare:number:gt[0]then[true]]">>|
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[[Then Filter Run Prefix (Examples)]]
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