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Merge pull request #165 from Brennall/nextprev

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Next and Previous filters plus tests and documentation
This commit is contained in:
Jeremy Ruston 2013-09-22 13:37:48 -07:00
commit 6642a6f087
4 changed files with 98 additions and 0 deletions
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43
core/modules/filters/next.js Normal file
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@ -0,0 +1,43 @@
/*\
title: $:/core/modules/filters/next.js
type: application/javascript
module-type: filteroperator
Filter operator returning the tiddler whose title occurs next in the list supplied in the operand tiddler
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.next = function(source,operator,options) {
var results = [],
list = options.wiki.getTiddlerList(operator.operand);
function checkTiddler(title) {
var match = list.indexOf(title);
// increment match and then test if result is in range
match++;
if(match > 0 && match < list.length) {
results.push(list[match]);
}
}
// Iterate through the source tiddlers
if($tw.utils.isArray(source)) {
$tw.utils.each(source,function(title) {
checkTiddler(title);
});
} else {
$tw.utils.each(source,function(element,title) {
checkTiddler(title);
});
}
return results;
};
})();

43
core/modules/filters/previous.js Normal file
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@ -0,0 +1,43 @@
/*\
title: $:/core/modules/filters/previous.js
type: application/javascript
module-type: filteroperator
Filter operator returning the tiddler whose title occurs immediately prior in the list supplied in the operand tiddler
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.previous = function(source,operator,options) {
var results = [],
list = options.wiki.getTiddlerList(operator.operand);
function checkTiddler(title) {
var match = list.indexOf(title);
// decrement match and then test if result is in range
match--;
if( match >= 0 ) {
results.push(list[match]);
}
}
// Iterate through the source tiddlers
if($tw.utils.isArray(source)) {
$tw.utils.each(source,function(title) {
checkTiddler(title);
});
} else {
$tw.utils.each(source,function(element,title) {
checkTiddler(title);
});
}
return results;
};
})();

10
editions/test/tiddlers/tests/test-filters.js
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@ -148,6 +148,16 @@ describe("Filter tests", function() {
expect(wiki.filterTiddlers("[tag[one]list[TiddlerSeventh]sort[title]]").join(",")).toBe("Tiddler Three,TiddlerOne");
});
it("should handle the next operator", function() {
expect(wiki.filterTiddlers("[[Tiddler Three]next[TiddlerSeventh]]").join(",")).toBe("a fourth tiddler");
expect(wiki.filterTiddlers("[[MissingTiddler]next[TiddlerSeventh]]").join(",")).toBe("");
});
it("should handle the previous operator", function() {
expect(wiki.filterTiddlers("[[Tiddler Three]previous[TiddlerSeventh]]").join(",")).toBe("TiddlerOne");
expect(wiki.filterTiddlers("[[TiddlerOne]previous[TiddlerSeventh]]").join(",")).toBe("");
});
it("should handle the search operator", function() {
expect(wiki.filterTiddlers("[search[the]sort[title]]").join(",")).toBe("$:/TiddlerTwo,a fourth tiddler,one,Tiddler Three,TiddlerOne");
expect(wiki.filterTiddlers("[search{Tiddler8}sort[title]]").join(",")).toBe("$:/TiddlerTwo,a fourth tiddler,one,Tiddler Three,TiddlerOne");

2
editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
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@ -48,6 +48,8 @@ A filter string consists of one or more runs of filter operators that each look
* ''links'': selects the outgoing links on the currently selected tiddlers
* ''backlinks'': selects the tiddlers that link to the currently selected tiddlers
* ''list'': selects the tiddlers listed in a specified [[TiddlerList|TiddlerLists]]
* ''next'': selects the next item in a TiddlerList after the current tiddler
* ''previous'': selects the previous item in a TiddlerList before the current tiddler
* ''listed'': selects the TiddlerLists that include the current tiddler
* ''each'': selects one tiddler for each discrete value of the specified field
* ''eachday'': selects one tiddler for each discrete day in the specified date field