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Alternate fix for inconsistent list template syntax (#7827)

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* Alternate fix for inconsistent list template syntax

First attempt, which fails on the ListWidget/WithMissingTemplate test.

* Make WithMissingTemplate test pass, inefficiently

Unfortunately, this ends up being very inefficient, because the
clone-and-mutate logic is repeated for every list item. Not ideal.

* More efficient way to do it

This also makes the failing test pass, but far more efficiently.

* Improve performance of list template discovery

Since parse tree nodes never change after widget creation (whereas
attribute values *can* change), we can safely search for the explicit
list templtaes only once, at widget creation time. This saves time as
the search doesn't have to be done on each re-render, and also allows us
to safely do a clone-and-mutate step to extract the list widget's body
(if any) without any `$list-empty` or other items. That, in turn, allows
using the list widget's body as the template even if `$list-empty` is
specified inside the widget body.
This commit is contained in:
Robin Munn 2023-11-07 04:18:31 +07:00 committed by GitHub
parent 6567843927
commit 758089cbb3
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 40 additions and 4 deletions
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44
core/modules/widgets/list.js
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@ -28,6 +28,18 @@ Inherit from the base widget class
*/
ListWidget.prototype = new Widget();
ListWidget.prototype.initialise = function(parseTreeNode,options) {
// Bail if parseTreeNode is undefined, meaning that the ListWidget constructor was called without any arguments so that it can be subclassed
if(parseTreeNode === undefined) {
return;
}
// First call parent constructor to set everything else up
Widget.prototype.initialise.call(this,parseTreeNode,options);
// Now look for <$list-template> and <$list-empty> widgets as immediate child widgets
// This is safe to do during initialization because parse trees never change after creation
this.findExplicitTemplates();
}
/*
Render this widget into the DOM
*/
@ -68,8 +80,6 @@ ListWidget.prototype.execute = function() {
this.counterName = this.getAttribute("counter");
this.storyViewName = this.getAttribute("storyview");
this.historyTitle = this.getAttribute("history");
// Look for <$list-template> and <$list-empty> widgets as immediate child widgets
this.findExplicitTemplates();
// Compose the list elements
this.list = this.getTiddlerList();
var members = [],
@ -92,6 +102,7 @@ ListWidget.prototype.findExplicitTemplates = function() {
var self = this;
this.explicitListTemplate = null;
this.explicitEmptyTemplate = null;
this.hasTemplateInBody = false;
var searchChildren = function(childNodes) {
$tw.utils.each(childNodes,function(node) {
if(node.type === "list-template") {
@ -100,6 +111,8 @@ ListWidget.prototype.findExplicitTemplates = function() {
self.explicitEmptyTemplate = node.children;
} else if(node.type === "element" && node.tag === "p") {
searchChildren(node.children);
} else {
self.hasTemplateInBody = true;
}
});
};
@ -160,11 +173,11 @@ ListWidget.prototype.makeItemTemplate = function(title,index) {
// Check for a <$list-item> widget
if(this.explicitListTemplate) {
templateTree = this.explicitListTemplate;
} else if (!this.explicitEmptyTemplate) {
} else if(this.hasTemplateInBody) {
templateTree = this.parseTreeNode.children;
}
}
if(!templateTree) {
if(!templateTree || templateTree.length === 0) {
// Default template is a link to the title
templateTree = [{type: "element", tag: this.parseTreeNode.isBlock ? "div" : "span", children: [{type: "link", attributes: {to: {type: "string", value: title}}, children: [
{type: "text", text: title}
@ -414,4 +427,27 @@ ListItemWidget.prototype.refresh = function(changedTiddlers) {
exports.listitem = ListItemWidget;
/*
Make <$list-template> and <$list-empty> widgets that do nothing
*/
var ListTemplateWidget = function(parseTreeNode,options) {
// Main initialisation inherited from widget.js
this.initialise(parseTreeNode,options);
};
ListTemplateWidget.prototype = new Widget();
ListTemplateWidget.prototype.render = function() {}
ListTemplateWidget.prototype.refresh = function() { return false; }
exports["list-template"] = ListTemplateWidget;
var ListEmptyWidget = function(parseTreeNode,options) {
// Main initialisation inherited from widget.js
this.initialise(parseTreeNode,options);
};
ListEmptyWidget.prototype = new Widget();
ListEmptyWidget.prototype.render = function() {}
ListEmptyWidget.prototype.refresh = function() { return false; }
exports["list-empty"] = ListEmptyWidget;
})();