Implemented runes

src/build/token/Kind.go

@@ -9,6 +9,7 @@ const (
 	NewLine                     // NewLine is the newline character.
 	Identifier                  // Identifier is a series of characters used to identify a variable or function.
 	Number                      // Number is a series of numerical characters.
+	Rune                        // Rune is a single unicode code point.
 	String                      // String is an uninterpreted series of characters in the source code.
 	Comment                     // Comment is a comment.
 	Separator                   // ,

src/build/token/Tokenize.go

@@ -48,13 +48,14 @@ func Tokenize(buffer []byte) List {
 
 			continue
 
-		case '"':
+		case '"', '\'':
+			limiter := buffer[i]
 			start := i
 			end := Position(len(buffer))
 			i++
 
 			for i < Position(len(buffer)) {
-				if buffer[i] == '"' {
+				if buffer[i] == limiter {
 					end = i + 1
 					i++
 					break
@@ -63,7 +64,13 @@ func Tokenize(buffer []byte) List {
 				i++
 			}
 
-			tokens = append(tokens, Token{Kind: String, Position: start, Length: Length(end - start)})
+			kind := String
+
+			if limiter == '\'' {
+				kind = Rune
+			}
+
+			tokens = append(tokens, Token{Kind: kind, Position: start, Length: Length(end - start)})
 			continue
 
 		default: