fix(if): Allow operator use

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Stencil Changelog
 
+## Master
+
+### Bug Fixes
+
+- Fixes an issue where using `{% if %}` statements which use operators would
+  throw a syntax error.
+
+
 ## 0.7.0
 
 ### Breaking

Sources/IfTag.swift

@@ -167,9 +167,6 @@ class IfNode : NodeType {
 
   class func parse(_ parser: TokenParser, token: Token) throws -> NodeType {
     var components = token.components()
-    guard components.count == 2 else {
-      throw TemplateSyntaxError("'if' statements should use the following 'if condition' `\(token.contents)`.")
-    }
     components.removeFirst()
     var trueNodes = [NodeType]()
     var falseNodes = [NodeType]()

Tests/StencilTests/IfNodeSpec.swift

@@ -27,6 +27,28 @@ func testIfNode() {
         try expect(falseNode?.text) == "false"
       }
 
+      $0.it("can parse an if with complex expression") {
+        let tokens: [Token] = [
+          .block(value: "if value == \"test\" and not name"),
+          .text(value: "true"),
+          .block(value: "else"),
+          .text(value: "false"),
+          .block(value: "endif")
+        ]
+
+        let parser = TokenParser(tokens: tokens, namespace: Namespace())
+        let nodes = try parser.parse()
+        let node = nodes.first as? IfNode
+        let trueNode = node?.trueNodes.first as? TextNode
+        let falseNode = node?.falseNodes.first as? TextNode
+
+        try expect(nodes.count) == 1
+        try expect(node?.trueNodes.count) == 1
+        try expect(trueNode?.text) == "true"
+        try expect(node?.falseNodes.count) == 1
+        try expect(falseNode?.text) == "false"
+      }
+
       $0.it("can parse an ifnot block") {
         let tokens: [Token] = [
           .block(value: "ifnot value"),