Implement Exactly + extra test for Sequence

1 files changed, 11 insertions, 1 deletions

diff --git a/src/parcom.cr b/src/parcom.cr
index d7e6682..c7f4012 100644
--- a/src/parcom.cr
+++ b/src/parcom.cr
@@ -295,7 +295,17 @@ module Parcom
     end
   end
 
-  class Exactly
+  class Exactly(T, V) < Parser(T, Array(V))
+    @p : Sequence(T, V)
+
+    def initialize(i : Int, p : Parser(T, V))
+      i = i.negative? ? 0 : i
+      @p = Sequence.new(([p] of Parser(T, V)) * i)
+    end
+
+    def parse(tokens : TokenStream(T)) : Result(T, Array(V))
+      @p.parse(tokens)
+    end
   end
 
   class AtLeast