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Merge pull request #1323 from aelocson/filter-tiddlers

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Further improvements around filter documentation
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Jeremy Ruston 2015-01-06 14:13:32 +00:00
commit 8c2eba03a3
4 changed files with 53 additions and 29 deletions
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2
editions/tw5.com/tiddlers/about/Tiddler Titles.tid
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@ -4,7 +4,7 @@ tags: documenting
Each of the main words of a tiddler title begins with a capital letter, but minor words such as "and", "or", "the", "to" and "with" do not. Avoid starting a tiddler with the word "the". Each of the main words of a tiddler title begins with a capital letter, but minor words such as "and", "or", "the", "to" and "with" do not. Avoid starting a tiddler with the word "the".
[[Reference Tiddlers]] have ~CamelCase nouns as their titles, e.g. ''~RevealWidget'', ''~CamelCase'', ''CSS''. The title is plural if it denotes a category, e.g. ''~KeyboardShorcuts'', ''~TiddlerFields''. Such categories are used to tag more specific tiddlers within the category. [[Reference Tiddlers]] have ~CamelCase nouns as their titles, e.g. ''~RevealWidget'', ''~CamelCase'', ''CSS''. The title is plural if it denotes a category, e.g. ''~KeyboardShortcuts'', ''~TiddlerFields''. Such categories are used to tag more specific tiddlers within the category.
Other tags usually consist of a single lowercase word. Avoid spaces in tags. Other tags usually consist of a single lowercase word. Avoid spaces in tags.

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editions/tw5.com/tiddlers/concepts/RailroadDiagrams.tid Normal file
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created: 20150105133800000
modified: 20150105134300000
title: RailroadDiagrams
Railroad diagrams, sometimes called syntax diagrams, are a visual way of explaining the syntax rules of a computer language. Reading one is like reading a public transport map.
Each diagram starts on the left and ends on the right. Simply follow any line from the startpoint to the endpoint. All the alternative lines are equally valid. A line will sometimes jump over an item that is optional, or loop back to indicate that an item can be repeated.
<$railroad text="""
start [:optional] {repeated +","} end
"""/>
Characters in round boxes are literal, i.e. they denote themselves. A name in a rectangular box denotes a further railroad diagram.
The railroad diagrams on this site are generated using the [[Railroad Plugin]].

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editions/tw5.com/tiddlers/filters/Introduction to Filters.tid
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@ -4,11 +4,11 @@ tags: Learning
title: Introduction to Filters title: Introduction to Filters
type: text/vnd.tiddlywiki type: text/vnd.tiddlywiki
A step by step introduction to how [[Filters]] are used. This is a step-by-step introduction to how [[Filters]] are used. [[Filter Syntax]] presents a more technical summary of this information.
! Using Filters ! Using Filters
Filters are a special language within WikiText for expressing lists of tiddlers. Filters are a special notation for expressing lists of tiddlers within WikiText.
Filters are used in the ListMacro, TabsMacro, ListWidget, CountWidget, and many other areas of TiddlyWiki. Filters are used in the ListMacro, TabsMacro, ListWidget, CountWidget, and many other areas of TiddlyWiki.
@ -18,7 +18,7 @@ For example, this is how the ListMacro would be used to display the first examp
<<list-links "HelloThere Introduction [[Title with Spaces]]">> <<list-links "HelloThere Introduction [[Title with Spaces]]">>
``` ```
The easiest way to experiment with tiddler filters is by typing them into the "Filter" tab of the [[advanced search panel|$:/AdvancedSearch]]. The easiest way to experiment with tiddler filters is by typing them into the ''Filter'' tab of the [[advanced search panel|$:/AdvancedSearch]].
! Simple Filters ! Simple Filters
@ -32,13 +32,13 @@ The titles must be separated by one or more spaces and/or linebreaks.
! Filter Operators ! Filter Operators
Filter operators are used to select tiddlers based on some criteria. For example, this filter consists of a single operation that selects all tiddlers tagged "introduction": Filter operators are used to select tiddlers in particular ways. For example, this filter consists of a single step that selects all tiddlers tagged ''introduction'':
``` ```
[tag[introduction]] [tag[introduction]]
``` ```
The word "tag" is the ''operator'' and "introduction" is the ''operand''. The word `tag` is the ''operator'' and `introduction` is the ''parameter'' (sometimes called the ''operand'').
See [[Filters]] for a complete list of the available operators. See [[Filters]] for a complete list of the available operators.
@ -46,9 +46,9 @@ See [[Filters]] for a complete list of the available operators.
The operator defaults to `title` if omitted, so `[[HelloThere]]` is equivalent to `[title[HelloThere]]`. If there are no spaces in the title, then the double square brackets can also be omitted: `HelloThere`. The operator defaults to `title` if omitted, so `[[HelloThere]]` is equivalent to `[title[HelloThere]]`. If there are no spaces in the title, then the double square brackets can also be omitted: `HelloThere`.
! Negating Filter Operators ! Negating Filter Steps
Filter operations can be negated by preceding the operator with an exclamation mark (!). This example selects all tiddlers that are not tagged "introduction": A filter step can be negated by preceding the operator with an exclamation mark (`!`). This example selects all tiddlers that are not tagged ''introduction'':
``` ```
[!tag[introduction]] [!tag[introduction]]
@ -56,7 +56,7 @@ Filter operations can be negated by preceding the operator with an exclamation m
! Operator Suffixes ! Operator Suffixes
Some filter operators can take an optional suffix that provides further information for the operation. For example, the "field" operator takes a suffix indicating the field to be compared. The following filter returns all tiddlers that have "JeremyRuston" in the "modifier" field: Some filter operators can take an optional suffix that provides further information. For example, the `field` operator takes a suffix indicating the field to be compared. The following filter returns all tiddlers that have ''JeremyRuston'' in the `modifier` field:
``` ```
[field:modifier[JeremyRuston]] [field:modifier[JeremyRuston]]
@ -64,70 +64,72 @@ Some filter operators can take an optional suffix that provides further informat
! Field Operator Shortcut ! Field Operator Shortcut
If an unknown operator is used then it is instead interpreted as the suffix of the "field" operator. Thus, these two filters both return all the tiddlers that contain the string "create" in their "caption" field: If an operator is not recognised, then it is instead interpreted as the suffix of the `field` operator. Thus, these two filters both return all the tiddlers that contain the string ''create'' in their `caption` field:
``` ```
[caption[create]] [caption[create]]
[field:caption[create]] [field:caption[create]]
``` ```
! Indirect Operands ! Indirect Parameters
If a filter operator is written with curly brackets around the operand then it is taken to be a TextReference to the actual value. For example, this filter selects all tiddlers containing the string contained in the tiddler titled "$:/temp/search" If a filter step has curly brackets around its parameter, then it is taken to be a TextReference to the actual value. For example, this filter selects all tiddlers containing the string contained in the ''$:/temp/search'' tiddler:
``` ```
[search{$:/temp/search}] [search{$:/temp/search}]
``` ```
! Variable Operands ! Variable Parameters
If a filter operator is written with angle brackets around the operand then it is taken to be the name of a variable containing the actual value. For example, this filter selects all tiddlers containing the title of the current tiddler: If a filter step has angle brackets around its parameter, then it is taken to be the name of a variable containing the actual value. For example, this filter selects all tiddlers containing the title of the current tiddler:
``` ```
[search<currentTiddler>] [search<currentTiddler>]
``` ```
(Note that the `currentTiddler` variable is used to track the current tiddler). (The built-in `currentTiddler` variable keeps track of which tiddler is the current one.)
! ORing Multiple Filter Operators ! ORing Multiple Filter Steps
You can use multiple filter operations at once. This example selects all tiddlers that are either tagged "introduction" or "demo": You can use multiple filter steps at once. If you write the steps separately, the overall result is the set of tiddlers that match //any// of the steps. Each step is processed separately, adding its tiddlers to the overall result.
This example selects all tiddlers that are either tagged ''introduction'' or ''demo'':
``` ```
[tag[introduction]] [tag[demo]] [tag[introduction]] [tag[demo]]
``` ```
Each separate operator is processed in turn, accumulating the tiddlers that they select. Here's an example that returns tiddlers tagged ''alpha'' or ''beta'' that are also tagged ''task'' but not tagged ''done'':
Here's an example that returns tiddlers tagged ''alpha'' or ''beta'' that are also tagged ''task'' and not tagged ''done'':
``` ```
[tag[alpha]] [tag[beta]] +[tag[task]!tag[done]] [tag[alpha]] [tag[beta]] +[tag[task]!tag[done]]
``` ```
! ANDing Multiple Filter Operators ! ANDing Multiple Filter Steps
A sequence of operators can be logically ANDed together by bashing them together and merging the outer square brackets. This is called a "run" of operations. For example, here we select tiddlers that are tagged "introduction" and also tagged "demo": A sequence of steps can also be combined by bashing them together and merging the outer square brackets. This is called a "run". The result is the set of tiddlers that match //all// of the steps in the run.
For example, here we select tiddlers that are tagged ''introduction'' and also tagged ''demo'':
``` ```
[tag[introduction]tag[demo]] [tag[introduction]tag[demo]]
``` ```
Here's another example that selects all tiddlers tagged "introduction" that are not tagged "demo": Here's another example that selects all tiddlers tagged ''introduction'' that are //not// tagged ''demo'':
``` ```
[tag[introduction]!tag[demo]] [tag[introduction]!tag[demo]]
``` ```
! Negating Runs of Filter Operators ! Negating Runs
Ordinarily, each run of filter operations adds to the accumulated results. Prefixing a run with `-` causes the list of tiddlers to instead be removed from the results. For example, this example returns all the tiddlers tagged "introduction" apart from `HelloThere` and `Title with Spaces`: Ordinarily, each run //adds// to the accumulated results. Prefixing a run with `-` instead causes the list of tiddlers selected to be //removed// from the results. For example, this example returns all the tiddlers tagged ''introduction'', apart from `HelloThere` and `Title with Spaces`:
``` ```
[tag[introduction]] -HelloThere -[[Title with Spaces]] [tag[introduction]] -HelloThere -[[Title with Spaces]]
``` ```
This example returns all tiddlers tagged "introduction" that are not also tagged "demo": This example returns all tiddlers tagged ''introduction'' that are not also tagged ''demo'':
``` ```
[tag[introduction]] -[tag[demo]] [tag[introduction]] -[tag[demo]]
@ -135,9 +137,9 @@ This example returns all tiddlers tagged "introduction" that are not also tagged
! Working with Filter Results ! Working with Filter Results
Usually, each run of filter operations takes as its source the entire store of available tiddlers. Prefixing a run with `+` causes the accumulated results to be used as the source instead. Usually, each run takes the entire store of available tiddlers as its source. Prefixing a run with `+` causes the results so far accumulated to be used as the source instead.
For example, this filter selects tiddlers tagged "introduction" or "demo" and then sorts the resulting list by the "title" field: For example, this filter selects tiddlers tagged ''introduction'' or ''demo'', and then sorts the resulting list by the `title` field:
``` ```
[tag[introduction]] [tag[demo]] +[sort[title]] [tag[introduction]] [tag[demo]] +[sort[title]]

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editions/tw5.com/tiddlers/plugins/Railroad Plugin.tid Normal file
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title: Railroad Plugin
modified: 20150105134500000
tags: Plugins
{{$:/plugins/tiddlywiki/railroad/readme}}
{{$:/plugins/tiddlywiki/railroad/syntax}}