94 lines
2.6 KiB
JavaScript
Executable File
94 lines
2.6 KiB
JavaScript
Executable File
/*\
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title: $:/core/modules/new_widgets/transclude.js
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type: application/javascript
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module-type: new_widget
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Transclude widget
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var Widget = require("$:/core/modules/new_widgets/widget.js").widget;
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var TranscludeWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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TranscludeWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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TranscludeWidget.prototype.render = function(parent,nextSibling) {
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this.parentDomNode = parent;
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this.computeAttributes();
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this.execute();
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this.renderChildren(parent,nextSibling);
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};
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/*
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Compute the internal state of the widget
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*/
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TranscludeWidget.prototype.execute = function() {
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// Get our parameters
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this.transcludeTitle = this.getAttribute("title",this.getVariable("tiddlerTitle"));
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this.transcludeField = this.getAttribute("field");
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this.transcludeIndex = this.getAttribute("index");
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// Check for recursion
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var recursionMarker = this.makeRecursionMarker();;
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if(this.parentWidget && this.parentWidget.hasVariable("transclusion",recursionMarker)) {
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this.makeChildWidgets([{type: "text", text: "Tiddler recursion error in transclude widget"}]);
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return;
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}
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// Set context variables for recursion detection
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this.setVariable("transclusion",recursionMarker);
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// Parse the text reference
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var parser = this.wiki.new_parseTextReference(
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this.transcludeTitle,
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this.transcludeField,
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this.transcludeIndex,
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{parseAsInline: !this.parseTreeNode.isBlock}),
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parseTreeNodes = parser ? parser.tree : [];
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// Construct the child widgets
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this.makeChildWidgets(parseTreeNodes);
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};
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/*
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Compose a string comprising the title, field and/or index to identify this transclusion for recursion detection
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*/
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TranscludeWidget.prototype.makeRecursionMarker = function() {
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var output = [];
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output.push("{");
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output.push(this.transcludeTitle || "");
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output.push("|");
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output.push(this.transcludeField || "");
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output.push("|");
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output.push(this.transcludeIndex || "");
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output.push("}");
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return output.join("");
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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TranscludeWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes.title || changedAttributes.field || changedAttributes.index || changedTiddlers[this.transcludeTitle]) {
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this.refreshSelf();
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return true;
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} else {
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return this.refreshChildren(changedTiddlers);
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}
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};
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exports.transclude = TranscludeWidget;
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})();
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