mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-12-29 11:30:28 +00:00
e932b09016
* Introduced preliminary idea for infinite recurse exception * Better handling of infinite recursion But it could be better still... * the TransclusionError is a proper error Moved the magic number to be on the error's class. Not sure if that's a great idea. * Fixed minor minor issue that came up in conflict The minor fix to the jasmine regexp that escaped a '+' somehow broke some random test.
485 lines
16 KiB
JavaScript
Executable File
485 lines
16 KiB
JavaScript
Executable File
/*\
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title: $:/core/modules/widgets/transclude.js
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type: application/javascript
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module-type: 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/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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try {
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this.renderChildren(parent,nextSibling);
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} catch(error) {
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if(error instanceof $tw.utils.TranscludeRecursionError) {
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// We were infinite looping.
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// We need to try and abort as much of the loop as we can, so we will keep "throwing" upward until we find a transclusion that has a different signature.
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// Hopefully that will land us just outside where the loop began. That's where we want to issue an error.
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// Rendering widgets beneath this point may result in a freezing browser if they explode exponentially.
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var transcludeSignature = this.getVariable("transclusion");
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if(this.getAncestorCount() > $tw.utils.TranscludeRecursionError.MAX_WIDGET_TREE_DEPTH - 50) {
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// For the first fifty transcludes we climb up, we simply collect signatures.
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// We're assuming that those first 50 will likely include all transcludes involved in the loop.
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error.signatures[transcludeSignature] = true;
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} else if(!error.signatures[transcludeSignature]) {
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// Now that we're past the first 50, let's look for the first signature that wasn't in the loop. That'll be where we print the error and resume rendering.
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this.children = [this.makeChildWidget({type: "error", attributes: {
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"$message": {type: "string", value: $tw.language.getString("Error/RecursiveTransclusion")}
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}})];
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this.renderChildren(parent,nextSibling);
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return;
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}
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}
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throw error;
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}
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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 attributes, string parameters, and slot values into properties of the widget object
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this.collectAttributes();
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this.collectStringParameters();
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this.collectSlotFillParameters();
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// Determine whether we're being used in inline or block mode
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var parseAsInline = !this.parseTreeNode.isBlock;
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if(this.transcludeMode === "inline") {
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parseAsInline = true;
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} else if(this.transcludeMode === "block") {
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parseAsInline = false;
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}
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// Set 'thisTiddler'
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this.setVariable("thisTiddler",this.transcludeTitle);
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var parseTreeNodes, target;
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// Process the transclusion according to the output type
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switch(this.transcludeOutput || "text/html") {
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case "text/html":
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// Return the parse tree nodes of the target
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target = this.parseTransclusionTarget(parseAsInline);
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this.parseAsInline = target.parseAsInline;
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parseTreeNodes = target.parseTreeNodes;
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break;
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case "text/raw":
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// Just return the raw text
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target = this.getTransclusionTarget();
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parseTreeNodes = [{type: "text", text: target.text}];
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break;
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default:
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// "text/plain" is the plain text result of wikifying the text
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target = this.parseTransclusionTarget(parseAsInline);
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var widgetNode = this.wiki.makeWidget(target.parser,{
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parentWidget: this,
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document: $tw.fakeDocument
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});
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var container = $tw.fakeDocument.createElement("div");
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widgetNode.render(container,null);
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parseTreeNodes = [{type: "text", text: container.textContent}];
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break;
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}
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this.sourceText = target.text;
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this.parserType = target.type;
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// Set the legacy transclusion context variables only if we're not transcluding a variable
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if(!this.transcludeVariable) {
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var recursionMarker = this.makeRecursionMarker();
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this.setVariable("transclusion",recursionMarker);
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}
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// Construct the child widgets
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this.makeChildWidgets(parseTreeNodes);
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};
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/*
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Collect the attributes we need, in the process determining whether we're being used in legacy mode
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*/
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TranscludeWidget.prototype.collectAttributes = function() {
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var self = this;
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// Detect legacy mode
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this.legacyMode = true;
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$tw.utils.each(this.attributes,function(value,name) {
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if(name.charAt(0) === "$") {
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self.legacyMode = false;
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}
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});
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// Get the attributes for the appropriate mode
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if(this.legacyMode) {
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this.transcludeTitle = this.getAttribute("tiddler",this.getVariable("currentTiddler"));
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this.transcludeSubTiddler = this.getAttribute("subtiddler");
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this.transcludeField = this.getAttribute("field");
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this.transcludeIndex = this.getAttribute("index");
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this.transcludeMode = this.getAttribute("mode");
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this.recursionMarker = this.getAttribute("recursionMarker","yes");
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} else {
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this.transcludeVariable = this.getAttribute("$variable");
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this.transcludeVariableIsFunction = false;
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this.transcludeType = this.getAttribute("$type");
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this.transcludeOutput = this.getAttribute("$output","text/html");
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this.transcludeTitle = this.getAttribute("$tiddler",this.getVariable("currentTiddler"));
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this.transcludeSubTiddler = this.getAttribute("$subtiddler");
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this.transcludeField = this.getAttribute("$field");
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this.transcludeIndex = this.getAttribute("$index");
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this.transcludeMode = this.getAttribute("$mode");
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this.recursionMarker = this.getAttribute("$recursionMarker","yes");
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}
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};
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/*
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Collect string parameters
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*/
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TranscludeWidget.prototype.collectStringParameters = function() {
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var self = this;
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this.stringParametersByName = Object.create(null);
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if(!this.legacyMode) {
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$tw.utils.each(this.attributes,function(value,name) {
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if(name.charAt(0) === "$") {
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if(name.charAt(1) === "$") {
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// Attributes starting $$ represent parameters starting with a single $
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name = name.slice(1);
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} else {
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// Attributes starting with a single $ are reserved for the widget
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return;
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}
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}
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self.stringParametersByName[name] = value;
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});
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}
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};
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/*
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Collect slot value parameters
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*/
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TranscludeWidget.prototype.collectSlotFillParameters = function() {
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var self = this;
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this.slotFillParseTrees = Object.create(null);
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if(this.legacyMode) {
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this.slotFillParseTrees["ts-missing"] = this.parseTreeNode.children;
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} else {
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this.slotFillParseTrees["ts-raw"] = this.parseTreeNode.children;
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var noFillWidgetsFound = true,
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searchParseTreeNodes = function(nodes) {
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$tw.utils.each(nodes,function(node) {
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if(node.type === "fill") {
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if(node.attributes["$name"] && node.attributes["$name"].type === "string") {
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var slotValueName = node.attributes["$name"].value;
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self.slotFillParseTrees[slotValueName] = node.children || [];
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}
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noFillWidgetsFound = false;
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} else {
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searchParseTreeNodes(node.children);
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}
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});
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};
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searchParseTreeNodes(this.parseTreeNode.children);
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if(noFillWidgetsFound) {
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this.slotFillParseTrees["ts-missing"] = this.parseTreeNode.children;
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}
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}
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};
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/*
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Get transcluded details as an object {text:,type:}
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*/
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TranscludeWidget.prototype.getTransclusionTarget = function() {
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var self = this;
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var text;
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// Return the text and type of the target
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if(this.hasAttribute("$variable")) {
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if(this.transcludeVariable) {
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// Transcluding a variable
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var variableInfo = this.getVariableInfo(this.transcludeVariable,{params: this.getOrderedTransclusionParameters()});
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this.transcludeVariableIsFunction = variableInfo.srcVariable && variableInfo.srcVariable.isFunctionDefinition;
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text = variableInfo.text;
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this.transcludeFunctionResult = text;
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return {
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text: variableInfo.text,
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type: this.transcludeType
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};
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}
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} else {
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// Transcluding a text reference
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var parserInfo = this.wiki.getTextReferenceParserInfo(
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this.transcludeTitle,
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this.transcludeField,
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this.transcludeIndex,
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{
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subTiddler: this.transcludeSubTiddler,
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defaultType: this.transcludeType
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});
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return {
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text: parserInfo.text,
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type: parserInfo.type
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};
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}
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};
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/*
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Get transcluded parse tree nodes as an object {text:,type:,parseTreeNodes:,parseAsInline:}
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*/
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TranscludeWidget.prototype.parseTransclusionTarget = function(parseAsInline) {
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var self = this;
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var parser;
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// Get the parse tree
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if(this.hasAttribute("$variable")) {
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if(this.transcludeVariable) {
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// Transcluding a variable
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var variableInfo = this.getVariableInfo(this.transcludeVariable,{params: this.getOrderedTransclusionParameters()}),
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srcVariable = variableInfo && variableInfo.srcVariable;
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if(srcVariable && srcVariable.isFunctionDefinition) {
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this.transcludeVariableIsFunction = true;
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this.transcludeFunctionResult = (variableInfo.resultList ? variableInfo.resultList[0] : variableInfo.text) || "";
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}
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if(variableInfo.text) {
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if(srcVariable && srcVariable.isFunctionDefinition) {
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parser = {
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tree: [{
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type: "text",
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text: this.transcludeFunctionResult
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}],
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source: this.transcludeFunctionResult,
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type: "text/vnd.tiddlywiki"
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};
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if(parseAsInline) {
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parser.tree[0] = {
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type: "text",
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text: this.transcludeFunctionResult
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};
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} else {
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parser.tree[0] = {
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type: "element",
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tag: "p",
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children: [{
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type: "text",
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text: this.transcludeFunctionResult
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}]
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}
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}
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} else {
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var cacheKey = (parseAsInline ? "inlineParser" : "blockParser") + (this.transcludeType || "");
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if(variableInfo.isCacheable && srcVariable[cacheKey]) {
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parser = srcVariable[cacheKey];
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} else {
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parser = this.wiki.parseText(this.transcludeType,variableInfo.text || "",{parseAsInline: parseAsInline, configTrimWhiteSpace: srcVariable && srcVariable.configTrimWhiteSpace});
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if(variableInfo.isCacheable) {
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srcVariable[cacheKey] = parser;
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}
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}
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}
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if(parser) {
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// Add parameters widget for procedures and custom widgets
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if(srcVariable && (srcVariable.isProcedureDefinition || srcVariable.isWidgetDefinition)) {
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parser = {
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tree: [
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{
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type: "parameters",
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children: parser.tree
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}
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],
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source: parser.source,
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type: parser.type
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}
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$tw.utils.each(srcVariable.params,function(param) {
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var name = param.name;
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// Parameter names starting with dollar must be escaped to double dollars
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if(name.charAt(0) === "$") {
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name = "$" + name;
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}
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$tw.utils.addAttributeToParseTreeNode(parser.tree[0],name,param["default"])
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});
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} else if(srcVariable && !srcVariable.isFunctionDefinition) {
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// For macros and ordinary variables, wrap the parse tree in a vars widget assigning the parameters to variables named "__paramname__"
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parser = {
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tree: [
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{
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type: "vars",
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children: parser.tree
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}
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],
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source: parser.source,
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type: parser.type
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}
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$tw.utils.each(variableInfo.params,function(param) {
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$tw.utils.addAttributeToParseTreeNode(parser.tree[0],"__" + param.name + "__",param.value)
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});
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}
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}
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}
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}
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} else {
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// Transcluding a text reference
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parser = this.wiki.parseTextReference(
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this.transcludeTitle,
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this.transcludeField,
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this.transcludeIndex,
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{
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parseAsInline: parseAsInline,
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subTiddler: this.transcludeSubTiddler,
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defaultType: this.transcludeType
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});
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}
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// Return the parse tree
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return {
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parser: parser,
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parseTreeNodes: parser ? parser.tree : (this.slotFillParseTrees["ts-missing"] || []),
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parseAsInline: parseAsInline,
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text: parser && parser.source,
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type: parser && parser.type
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};
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};
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/*
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Fetch all the string parameters as an ordered array of {name:, value:} where the name is optional
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*/
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TranscludeWidget.prototype.getOrderedTransclusionParameters = function() {
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var result = [];
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// Collect the parameters
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for(var name in this.stringParametersByName) {
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var value = this.stringParametersByName[name];
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result.push({name: name, value: value});
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}
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// Sort numerical parameter names first
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result.sort(function(a,b) {
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var aIsNumeric = !isNaN(a.name),
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bIsNumeric = !isNaN(b.name);
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if(aIsNumeric && bIsNumeric) {
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return a.name - b.name;
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} else if(aIsNumeric) {
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return -1;
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} else if(bIsNumeric) {
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return 1;
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} else {
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return a.name === b.name ? 0 : (a.name < b.name ? -1 : 1);
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}
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});
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// Remove names from numerical parameters
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$tw.utils.each(result,function(param,index) {
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if(!isNaN(param.name)) {
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delete param.name;
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}
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});
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return result;
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};
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/*
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Fetch the value of a parameter
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*/
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TranscludeWidget.prototype.getTransclusionParameter = function(name,index,defaultValue) {
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if(name in this.stringParametersByName) {
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return this.stringParametersByName[name];
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} else {
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var name = "" + index;
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if(name in this.stringParametersByName) {
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return this.stringParametersByName[name];
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}
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}
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return defaultValue;
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};
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/*
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Get one of the special parameters to be provided by the parameters widget
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*/
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TranscludeWidget.prototype.getTransclusionMetaParameters = function() {
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var self = this;
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return {
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"parseMode": function() {
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return self.parseAsInline ? "inline" : "block";
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},
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"parseTreeNodes": function() {
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return JSON.stringify(self.parseTreeNode.children || []);
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},
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"slotFillParseTreeNodes": function() {
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return JSON.stringify(self.slotFillParseTrees);
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},
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"params": function() {
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return JSON.stringify(self.stringParametersByName);
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}
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};
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};
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/*
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Fetch the value of a slot
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*/
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TranscludeWidget.prototype.getTransclusionSlotFill = function(name,defaultParseTreeNodes) {
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if(name && this.slotFillParseTrees[name] && this.slotFillParseTrees[name].length > 0) {
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return this.slotFillParseTrees[name];
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} else {
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return defaultParseTreeNodes || [];
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}
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};
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/*
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Return whether this transclusion should be visible to the slot widget
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*/
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TranscludeWidget.prototype.hasVisibleSlots = function() {
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return this.getAttribute("$fillignore","no") === "no";
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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.getVariable("currentTiddler",{defaultValue: ""}));
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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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output.push(this.transcludeSubTiddler || "");
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output.push("}");
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return output.join("");
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};
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TranscludeWidget.prototype.parserNeedsRefresh = function() {
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// Doesn't need to consider transcluded variables because a parent variable can't change once a widget has been created
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var parserInfo = this.wiki.getTextReferenceParserInfo(this.transcludeTitle,this.transcludeField,this.transcludeIndex,{subTiddler:this.transcludeSubTiddler});
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return (this.sourceText === undefined || parserInfo.sourceText !== this.sourceText || parserInfo.parserType !== this.parserType)
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};
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TranscludeWidget.prototype.functionNeedsRefresh = function() {
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var oldResult = this.transcludeFunctionResult;
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var variableInfo = this.getVariableInfo(this.transcludeVariable,{params: this.getOrderedTransclusionParameters()});
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var newResult = (variableInfo.resultList ? variableInfo.resultList[0] : variableInfo.text) || "";
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return oldResult !== newResult;
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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(($tw.utils.count(changedAttributes) > 0) || (this.transcludeVariableIsFunction && this.functionNeedsRefresh()) || (!this.transcludeVariable && changedTiddlers[this.transcludeTitle] && this.parserNeedsRefresh())) {
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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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