Merge pull request #72 from Igor-Palaguta/EmptyArrayCondition

empty array should return false inside if statement

Author: tanner0101

Resources/if-empty-array-test.leaf

@@ -0,0 +1 @@
+#if(array) { not empty }

Sources/Leaf/Tag/Models/If.swift

@@ -21,6 +21,8 @@ public final class If: Tag {
         if let bool = value.bool { return bool }
         // Empty string value returns false.
         if value.string == "" { return false }
+        // Empty array value returns false.
+        if let array = value.array, array.isEmpty { return false }
         // Otherwise, not-nil returns true.
         return true
     }

Tests/LeafTests/IfTests.swift

@@ -97,4 +97,22 @@ class IfTests: XCTestCase {
             XCTAssert(rendered == expectation, "have: \(rendered), want: \(expectation)")
         }
     }
+
+    func testIfEmptyArray() throws {
+        let template = try stem.spawnLeaf(at: "if-empty-array-test")
+        do {
+            let context = try Node(node: ["array": ["First"]])
+            let loadable = Context(context)
+            let rendered = try stem.render(template, with: loadable).makeString()
+            let expectation = "not empty"
+            XCTAssert(rendered == expectation, "have: \(rendered), want: \(expectation)")
+        }
+        do {
+            let context = try Node(node: ["array": []])
+            let loadable = Context(context)
+            let rendered = try stem.render(template, with: loadable).makeString()
+            let expectation = ""
+            XCTAssert(rendered == expectation, "have: \(rendered), want: \(expectation)")
+        }
+    }
 }