Add support for number tokens in ImapTokenizer

Author: stevebauman

src/Connection/ImapTokenizer.php

@@ -9,6 +9,7 @@
 use DirectoryTree\ImapEngine\Connection\Tokens\ListClose;
 use DirectoryTree\ImapEngine\Connection\Tokens\ListOpen;
 use DirectoryTree\ImapEngine\Connection\Tokens\Literal;
+use DirectoryTree\ImapEngine\Connection\Tokens\Number;
 use DirectoryTree\ImapEngine\Connection\Tokens\QuotedString;
 use DirectoryTree\ImapEngine\Connection\Tokens\ResponseCodeClose;
 use DirectoryTree\ImapEngine\Connection\Tokens\ResponseCodeOpen;
@@ -120,6 +121,11 @@ public function nextToken(): ?Token
             return $this->readLiteral();
         }
 
+        // Check for number.
+        if (ctype_digit($char)) {
+            return $this->readNumber();
+        }
+
         // Otherwise, parse an atom.
         return $this->readAtom();
     }
@@ -300,6 +306,36 @@ protected function readLiteral(): Literal
         return new Literal($literal);
     }
 
+    /**
+     * Reads a number token.
+     *
+     * Numbers are sequences of digits.
+     */
+    protected function readNumber(): Number
+    {
+        $value = '';
+
+        while (true) {
+            $this->ensureBuffer(1);
+
+            $char = $this->currentChar();
+
+            if ($char === null) {
+                break;
+            }
+
+            if (! ctype_digit($char)) {
+                break;
+            }
+
+            $value .= $char;
+
+            $this->advance();
+        }
+
+        return new Number($value);
+    }
+
     /**
      * Reads an atom token.
      *

src/Connection/Tokens/Number.php

@@ -0,0 +1,5 @@
+<?php
+
+namespace DirectoryTree\ImapEngine\Connection\Tokens;
+
+class Number extends Token {}