Better handling of infinite recursion
But it could be better still...
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@ -8,8 +8,9 @@ Custom errors for TiddlyWiki.
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\*/
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(function(){
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function TranscludeRecursionError(transcludeMarker) {
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this.marker = transcludeMarker;
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function TranscludeRecursionError(depth) {
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this.depth = depth;
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this.signatures = Object.create(null);
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};
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exports.TranscludeRecursionError = TranscludeRecursionError;
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@ -38,7 +38,13 @@ TranscludeWidget.prototype.render = function(parent,nextSibling) {
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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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if(error.marker !== this.getVariable("transclusion")) {
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var transcludeSignature = this.getVariable("transclusion");
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if(this.getAncestorCount() > error.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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@ -495,7 +495,7 @@ Widget.prototype.makeChildWidgets = function(parseTreeNodes,options) {
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var self = this;
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// Check for too much recursion
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if(this.getAncestorCount() > MAX_WIDGET_TREE_DEPTH) {
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throw new $tw.utils.TranscludeRecursionError(this.getVariable("transclusion"));
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throw new $tw.utils.TranscludeRecursionError(MAX_WIDGET_TREE_DEPTH);
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} else {
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// Create set variable widgets for each variable
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$tw.utils.each(options.variables,function(value,name) {
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@ -160,7 +160,7 @@ describe("Widget module", function() {
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expect(wrapper.innerHTML).toBe("<span class=\"tc-error\">Recursive transclusion error in transclude widget</span>");
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});
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it("should handle recursion with branching nodes", function() {
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it("should handle single-tiddler recursion with branching nodes", function() {
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var wiki = new $tw.Wiki();
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// Add a tiddler
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wiki.addTiddlers([
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@ -180,6 +180,27 @@ describe("Widget module", function() {
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expect(wrapper.innerHTML).toBe("<span class=\"tc-error\">Recursive transclusion error in transclude widget</span> <span class=\"tc-error\">Recursive transclusion error in transclude widget</span>");
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});
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fit("should handle many-tiddler recursion with branching nodes", function() {
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var wiki = new $tw.Wiki();
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// Add a tiddler
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wiki.addTiddlers([
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{title: "TiddlerOne", text: "<$transclude tiddler='TiddlerTwo'/> <$transclude tiddler='TiddlerTwo'/>"},
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{title: "TiddlerTwo", text: "<$transclude tiddler='TiddlerOne'/>"}
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]);
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// Test parse tree
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var parseTreeNode = {type: "widget", children: [
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{type: "transclude", attributes: {
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"tiddler": {type: "string", value: "TiddlerOne"}
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}}
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]};
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// Construct the widget node
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var widgetNode = createWidgetNode(parseTreeNode,wiki);
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// Render the widget node to the DOM
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var wrapper = renderWidgetNode(widgetNode);
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// Test the rendering
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expect(wrapper.innerHTML).toBe("<span class=\"tc-error\">Recursive transclusion error in transclude widget</span>");
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});
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it("should deal with SVG elements", function() {
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var wiki = new $tw.Wiki();
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// Construct the widget node
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