Add support for elseif blocks

core/modules/parsers/wikiparser/rules/conditional.js

@@ -53,6 +53,10 @@ exports.parse = function() {
 	var filterCondition = this.parser.source.substring(this.match.index + this.match[0].length,this.terminateIfMatch.index);
 	// Advance the parser position to past the %}
 	this.parser.pos = this.terminateIfMatch.index + this.terminateIfMatch[0].length;
+	return this.parseIfBlock(filterCondition);
+};
+
+exports.parseIfBlock = function(filterCondition) {
 	// Create the list widget
 	var listWidget = {
 		type: "list",
@@ -73,7 +77,7 @@ exports.parse = function() {
 	$tw.utils.addAttributeToParseTreeNode(listWidget,"variable","condition");
 	$tw.utils.addAttributeToParseTreeNode(listWidget,"limit","1");
 	// Parse the body looking for else or endif
-	var reEndString = "\\{\\%\\s*(endif)\\s*\\%\\}|\\{\\%\\s*(else)\\s*\\%\\}",
+	var reEndString = "\\{\\%\\s*(endif)\\s*\\%\\}|\\{\\%\\s*(else)\\s*\\%\\}|\\{\\%\\s*(elseif)\\s+([\\s\\S]+?)\\%\\}",
 		ex;
 	if(this.is.block) {
 		ex = this.parser.parseBlocksTerminatedExtended(reEndString);
@@ -99,6 +103,9 @@ exports.parse = function() {
 			}
 			// Put the parsed content inside the list empty template
 			listWidget.children[1].children = ex.tree;
+		} else if(ex.match[3] === "elseif") {
+			// Parse the elseif block by reusing this parser, passing the new filter condition
+			listWidget.children[1].children = this.parseIfBlock(ex.match[4]);
 		}
 	}
 	// Return the parse tree node

editions/test/tiddlers/tests/data/conditionals/Elseif.tid

@@ -0,0 +1,32 @@
+title: Conditionals/Elseif
+description: Elseif conditional shortcut syntax
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Text
+
+This is a {% if [<something>match[one]] %}Elephant{% elseif [<something>match[two]] %}Antelope{% else %}Crocodile{% endif %}, I think.
++
+title: Output
+
+<$let something="one">
+{{Text}}
+</$let>
+
+<$let something="two">
+{{Text}}
+</$let>
+
+<$let something="three">
+{{Text}}
+</$let>
++
+title: ExpectedResult
+
+<p>
+This is a Elephant, I think.
+</p><p>
+This is a Antelope, I think.
+</p><p>
+This is a Crocodile, I think.
+</p>