From 2eb5a432d2229788ce2fdb09f36c6f4bebdea813 Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Fri, 7 Feb 2020 09:44:59 +0100
Subject: Initial commit

---
 src/Search/CharSource.php | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/Search/CharSource.php

(limited to 'src/Search/CharSource.php')

diff --git a/src/Search/CharSource.php b/src/Search/CharSource.php
new file mode 100644
index 0000000..165e538
--- /dev/null
+++ b/src/Search/CharSource.php
@@ -0,0 +1,33 @@
+<?php
+
+
+namespace Micropoly\Search;
+
+
+class CharSource
+{
+    private string $s;
+    private int $i = 0;
+    private int $len;
+
+    public function __construct(string $s)
+    {
+        $this->s = $s;
+        $this->len = mb_strlen($s);
+    }
+
+    public function getNext(): ?string
+    {
+        if ($this->i >= $this->len)
+            return null;
+
+        $c = mb_substr($this->s, $this->i, 1);
+        $this->i++;
+        return $c;
+    }
+
+    public function unget(): void
+    {
+        $this->i = max(0, $this->i - 1);
+    }
+}
\ No newline at end of file
-- 
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