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Slightly fewer inaccuracies in the filter docs

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Jeremy Ruston 2012-07-17 12:44:33 +01:00
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tw5.com/tiddlers/concepts/TiddlerFilters.tid
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@ -3,35 +3,38 @@ tags: docs concepts
TiddlyWiki has a special syntax for expressing filters. They can be used to select tiddlers for an operation, or to filter a set of tiddlers to add or remove members.
! Examples
The mechanism is easiest to understand by first presenting some example filter strings:
{{table-condensed{
|!Filter |!Results |
|`HelloThere` |The single tiddler titled `HelloThere` (if it exists) |
|`[[A Title With Several Words]]` |The single tiddler titled `A Title With Several Words` (if it exists) |
|`[title[MyTiddler]]` |The single tiddler titled `MyTiddler` (if it exists) |
|`HelloThere Introduction` |The tiddlers titled `HelloThere` and `Introduction` (if they exist) |
|`[tag[important]]` |Any tiddlers with the tag `important` |
|`[!tag[important]]` |Any tiddlers not with the tag `important` |
|`[tag[important]sort[title]]` |Any tiddlers with the tag `important` sorted by title |
|`[tag[important]!sort[title]]` |Any tiddlers with the tag `important` reverse sorted by title |
|`[[one][two][three]tag[tom]]` |Any of the tiddlers called `one`, `two` or `three` that exist and are tagged with `tom` |
|`[[one][two][three]] [tag[tom]]` |Any of the tiddlers called `one`, `two` or `three` that exist, along with all of the source tiddlers that are tagged with `tom` |
|`[tag[important]]` |All tiddlers with the tag `important` |
|`[!tag[important]]` |All tiddlers not with the tag `important` |
|`[tag[important]sort[title]]` |All tiddlers with the tag `important` sorted by title |
|`[tag[important]!sort[title]]` |All tiddlers with the tag `important` reverse sorted by title |
|`[[one]] [[two]] [[three]] +[tag[tom]]` |Any of the tiddlers called `one`, `two` or `three` that exist and are tagged with `tom` |
|`[[one]] [[two]] [[three]] [tag[tom]]` |Any of the tiddlers called `one`, `two` or `three` that exist, along with all of the source tiddlers that are tagged with `tom` |
|`[tag[tom]] [tag[harry]] -[[one][two][three]]` |All tiddlers tagged either `tom` or `harry`, but excluding `one`, `two` and `three` |
|`[[MyTiddler]tags[]]` |all tiddlers being used as tags on the tiddler `MyTiddler` |
|`[[MyTiddler]tagging[]]` |all tiddlers being tagged with `MyTiddler` |
|`[[MyTiddler]tags[]]` |All tiddlers being used as tags on the tiddler `MyTiddler` |
|`[[MyTiddler]tagging[]]` |All tiddlers being tagged with `MyTiddler` |
}}}
! Explanation
! Operators
A filter string consists of one or more filter operations, each comprising one or more filter operators with associated operands.
The operators look like `[operator[operand]]`, where `operator` is one of:
The operations look like `[operator[operand]]`, where `operator` is one of:
* ''title'': selects the tiddler with the title given in the operand
* ''is'': tests whether a tiddler is a member of the system defined set named in the operand (see below)
* ''has'': tests whether a tiddler has a specified field
* ''sort'': sorts the tiddlers by a given field
* ''sort-case-sensitive'': sorts the tiddlers by a given field with case sensitivity (ie, "a" and "A" are sorted differently)
* ''sort-case-sensitive'': a case sensitive sort of the current tiddlers
* ''prefix'': tests whether a tiddlers title starts with a particular prefix
* ''limit'': limits the number of subresults
* ''tag'': tests whether a given tag is (`[tag[mytag]]`) or is not (`[!tag[mytag]]`) present on the tiddler
@ -48,15 +51,19 @@ The operands available with the `is` operator are:
* ''shadow'': selects all shadow tiddlers
* ''current'': selects the current ContextTiddler
Operators are combined into logically ANDed expressions by bashing them together and merging the square brackets:
! Runs
Operators are combined into runs that function as logically ANDed expressions by bashing them together and merging the square brackets:
{{{
[tag[one]] [tag[two]] ---> [tag[one]tag[two]]
}}}
Operations can be preceded with `-` to negate their action, removing the selected tiddlers from the results. For example, `[tag[Tommy]] -HelloThere -[[Another One]]` selects all tiddlers tagged with `Tommy` except those titled `HelloThere` or `Another One`.
Operation runs can be preceded with `-` to negate their action, removing the selected tiddlers from the results. For example, `[tag[Tommy]] -HelloThere -[[Another One]]` selects all tiddlers tagged with `Tommy` except those titled `HelloThere` or `Another One`.
Operations can be preceded with `+` in order to make them apply to all of the current results, rather than the original source. For example, `[tag[Jeremy]] [tag[Tommy]] +[sort[title]]` selects the tiddlers tagged `Tommy` or `Jeremy`, and sorts them by the `title` field.
Operation runs can be preceded with `+` in order to make them apply to all of the accumulated results, rather than the original source. For example, `[tag[Jeremy]] [tag[Tommy]] +[sort[title]]` selects the tiddlers tagged `Tommy` or `Jeremy`, and sorts them by the `title` field.
! Processing model
Filters are processed with the following elements: