Add tokens and token parser

Stencil/Parser.swift

@@ -0,0 +1,54 @@
+//
+//  Parser.swift
+//  Stencil
+//
+//  Created by Kyle Fuller on 23/10/2014.
+//  Copyright (c) 2014 Cocode. All rights reserved.
+//
+
+import Foundation
+
+public class TokenParser {
+    private var tokens:[Token]
+
+    public init(tokens:[Token]) {
+        self.tokens = tokens
+    }
+
+    public func parse() -> [Node] {
+        return parse(nil)
+    }
+
+    public func parse(parse_until:((parser:TokenParser, token:Token) -> (Bool))?) -> [Node] {
+        var nodes = [Node]()
+
+        while tokens.count > 0 {
+            let token = nextToken()!
+
+            switch token {
+            case .Text(let text):
+                nodes.append(TextNode(text: text))
+            case .Variable(let variable):
+                nodes.append(VariableNode(variable: variable))
+            case .Block(let value):
+                continue
+            case .Comment(let value):
+                continue
+            }
+        }
+
+        return nodes
+    }
+
+    public func nextToken() -> Token? {
+        if tokens.count > 0 {
+            return tokens.removeAtIndex(0)
+        }
+
+        return nil
+    }
+
+    public func prependToken(token:Token) {
+        tokens.insert(token, atIndex: 0)
+    }
+}