PHP 5.3 closure-based implementation of curry(); old implementation used as fallback for older PHP versions. Added unit tests to confirm they both work!

1 files changed, 36 insertions, 0 deletions

diff --git a/lib/curry.php b/lib/curry.php
new file mode 100644
index 000000000..6136dcdc3
--- /dev/null
+++ b/lib/curry.php
@@ -0,0 +1,36 @@
+<?php
+/*
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, StatusNet, Inc.
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * PHP 5.3 implementation of function currying, using native closures.
+ * On 5.2 and lower we use the fallback implementation in util.php
+ *
+ * @param callback $fn
+ * @param ... any remaining arguments will be appended to call-time params
+ * @return callback
+ */
+function curry($fn) {
+    $extra_args = func_get_args();
+    array_shift($extra_args);
+    return function() use ($fn, $extra_args) {
+        $args = func_get_args();
+        return call_user_func_array($fn,
+            array_merge($args, $extra_args));
+    };
+}