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Code Issues Releases Wiki Activity

Add support for [is[blank]] to detect empty/blank strings

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This commit is contained in:
Jeremy Ruston 2019-06-21 10:20:37 +01:00
parent 9b27f82a80
commit 90684f9f52
2 changed files with 39 additions and 2 deletions
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36
core/modules/filters/is/blank.js Normal file
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@ -0,0 +1,36 @@
/*\
title: $:/core/modules/filters/is/blank.js
type: application/javascript
module-type: isfilteroperator
Filter function for [is[blank]]
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.blank = function(source,prefix,options) {
var results = [];
if(prefix === "!") {
source(function(tiddler,title) {
if(title) {
results.push(title);
}
});
} else {
source(function(tiddler,title) {
if(!title) {
results.push(title);
}
});
}
return results;
};
})();

5
editions/tw5.com/tiddlers/filters/is.tid
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@ -13,7 +13,7 @@ op-neg-output: those input tiddlers that do <<.em not>> belong to category <<.pl
The parameter <<.place C>> is one of the following fundamental categories:
|!Category |!Matches any tiddler that... |
|!Category |!Matches any tiddler title that... |
|^`current` |is the [[current tiddler|Current Tiddler]] |
|^`image` |has an image ContentType |
|^`missing` |does not exist (other than possibly as a shadow tiddler), regardless of whether there are any links to it |
@ -22,7 +22,8 @@ The parameter <<.place C>> is one of the following fundamental categories:
|^`system` |is a [[system tiddler|SystemTiddlers]], i.e. its title starts with `$:/` |
|^`tag` |is in use as a tag |
|^`tiddler` |exists as a non-shadow tiddler |
|^`variable` |<<.from-version "5.1.20">> exists as a variable (whether or not it has a non-blank value) |
|^`variable` |<<.from-version "5.1.20">> exists as a variable (whether or not that variable has a non-blank value) |
|^`blank` |<<.from-version "5.1.20">> is blank (i.e. is a zero length string) |
If <<.place C>> is anything else an error message is returned. <<.from-version "5.1.14">> if <<.place C>> is blank, the output is passed through unchanged (in earlier versions an error message was returned).