Fix parsing token components with parenthesis without spaces (#254)

* fix parsing token components with brackets without spaces

* handle more edge cases

* do not use force unwrap

* use first/last instead of hasPrefix/hasSuffix

* update CHANGELOG

CHANGELOG.md

@@ -16,7 +16,9 @@ _None_
 
 ### Bug Fixes
 
-_None_
+- Fixed using parenthesis in boolean expressions, they now can be used without spaces around them.  
+  [Ilya Puchka](https://github.com/ilyapuchka)
+  [#254](https://github.com/stencilproject/Stencil/pull/254)
 
 ### Internal Changes
 

Sources/Tokenizer.swift

@@ -17,6 +17,12 @@ extension String {
           components[components.count-1] += word
         } else if specialCharacters.contains(word) {
           components[components.count-1] += word
+        } else if word != "(" && word.first == "(" || word != ")" && word.first == ")" {
+          components.append(String(word.prefix(1)))
+          appendWord(String(word.dropFirst()))
+        } else if word != "(" && word.last == "(" || word != ")" && word.last == ")" {
+          appendWord(String(word.dropLast()))
+          components.append(String(word.suffix(1)))
         } else {
           components.append(word)
         }

Tests/StencilTests/IfNodeSpec.swift

@@ -145,7 +145,7 @@ class IfNodeTests: XCTestCase {
 
         $0.it("can parse an if with complex expression") {
           let tokens: [Token] = [
-            .block(value: "if value == \"test\" and not name", at: .unknown),
+            .block(value: "if value == \"test\" and (not name or not (name and surname) or( some )and other )", at: .unknown),
             .text(value: "true", at: .unknown),
             .block(value: "endif", at: .unknown)
           ]