refactor

[m6w6/seekat] / lib / functions.php

diff --git a/lib/functions.php b/lib/functions.php
new file mode 100644 (file)
index 0000000..9e82d72
--- /dev/null
+++ b/lib/functions.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace seekat\Exception;
+
+function message(&$error) : string {
+       if ($error instanceof \Throwable) {
+               $message = $error->getMessage();
+       } else {
+               $message = $error;
+               $error = new \Exception($error);
+       }
+       return $message;
+}
+
+namespace seekat\API\Links;
+
+use React\Promise\{
+       ExtendedPromiseInterface,
+       function reject
+};
+use seekat\API;
+use seekat\API\Call\Cache;
+
+/**
+ * Perform a GET request against the link's "first" relation
+ *
+ * @return ExtendedPromiseInterface
+ */
+function first(API $api, Cache\Service $cache = null) : ExtendedPromiseInterface {
+       $links = $api->getLinks();
+       if ($links && ($first = $links->getFirst())) {
+               return $api->withUrl($first)->get(null, null, $cache);
+       }
+       return reject($links);
+}
+
+/**
+ * Perform a GET request against the link's "prev" relation
+ *
+ * @return ExtendedPromiseInterface
+ */
+function prev(API $api, Cache\Service $cache = null) : ExtendedPromiseInterface {
+       $links = $api->getLinks();
+       if ($links && ($prev = $links->getPrev())) {
+               return $api->withUrl($prev)->get(null, null, $cache);
+       }
+       return reject($links);
+}
+
+/**
+ * Perform a GET request against the link's "next" relation
+ *
+ * @return ExtendedPromiseInterface
+ */
+function next(API $api, Cache\Service $cache = null) : ExtendedPromiseInterface {
+       $links = $api->getLinks();
+       if ($links && ($next = $links->getNext())) {
+               return $api->withUrl($next)->get(null, null, $cache);
+       }
+       return reject($links);
+}
+
+/**
+ * Perform a GET request against the link's "last" relation
+ *
+ * @return ExtendedPromiseInterface
+ */
+function last(API $api, Cache\Service $cache = null) : ExtendedPromiseInterface {
+       $links = $api->getLinks();
+       if ($links && ($last = $links->getLast())) {
+               return $api->withUrl($last)->get(null, null, $cache);
+       }
+       return reject($links);
+}
+