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+;;; kolam --- GraphQL implementation
+;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of kolam.
+;;;
+;;; kolam is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU Affero General Public License as
+;;; published by the Free Software Foundation; either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; kolam is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public
+;;; License along with kolam.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(import (srfi srfi-64))
+
+(define token-pattern
+  (@@ (kolam parse) token-pattern))
+
+(define token-value-pattern
+  (@@ (kolam parse) token-value-pattern))
+
+(define optional?
+  (@@ (kolam parse) optional?))
+
+(eval-when (expand load eval)
+  (define (macro-ref module symbol)
+    (macro-transformer
+     (module-ref (resolve-module module) symbol))))
+
+(define-syntax pattern-many
+  (macro-ref '(kolam parse) 'pattern-many))
+
+(define-syntax pattern-optional
+  (macro-ref '(kolam parse) 'pattern-optional))
+
+(define-syntax pattern-and
+  (macro-ref '(kolam parse) 'pattern-and))
+
+(define-syntax pattern-or
+  (macro-ref '(kolam parse) 'pattern-or))
+
+(test-begin "parse")
+
+(test-assert "pattern-and should not fail when matching an optional pattern on an empty list of tokens"
+  ((pattern-and identity
+                (pattern-optional (token-pattern 'foo)))
+   (list)))
+
+(test-assert "pattern-or should not fail when matching an optional pattern on an empty list of tokens"
+  ((pattern-or identity
+               (pattern-optional (token-pattern 'foo)))
+   (list)))
+
+(test-equal "pattern-many should return an empty list when there are no matches"
+  (list)
+  ((pattern-many identity
+                 (token-pattern 'foo))
+   (list (cons 'bar 1))))
+
+(test-end "parse")