Add ArgvParser, StringIterator

Shamelessly stolen from http://stackoverflow.com/a/18229461

src/App/Utility/ArgvParser.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace App\Utility;
+
+// stolen from http://stackoverflow.com/a/18229461
+class ArgvParser extends StringIterator
+{
+    const TOKEN_DOUBLE_QUOTE = '"';
+    const TOKEN_SINGLE_QUOTE = "'";
+    const TOKEN_SPACE = ' ';
+    const TOKEN_ESCAPE = '\\';
+
+    public function parse()
+    {
+        $this->rewind();
+
+        $args = [];
+
+        while ($this->valid()) {
+            switch ($this->current()) {
+                case self::TOKEN_DOUBLE_QUOTE:
+                case self::TOKEN_SINGLE_QUOTE:
+                    $args[] = $this->QUOTED($this->current());
+                    break;
+
+                case self::TOKEN_SPACE:
+                    $this->next();
+                    break;
+
+                default:
+                    $args[] = $this->UNQUOTED();
+            }
+        }
+
+        return $args;
+    }
+
+    private function QUOTED($enclosure)
+    {
+        $this->next();
+        $result = '';
+
+        while ($this->valid()) {
+            if ($this->current() == self::TOKEN_ESCAPE) {
+                $this->next();
+                if ($this->valid() && $this->current() == $enclosure) {
+                    $result .= $enclosure;
+                } elseif ($this->valid()) {
+                    $result .= self::TOKEN_ESCAPE;
+                    if ($this->current() != self::TOKEN_ESCAPE) {
+                        $result .= $this->current();
+                    }
+                }
+            } elseif ($this->current() == $enclosure) {
+                $this->next();
+                break;
+            } else {
+                $result .= $this->current();
+            }
+            $this->next();
+        }
+
+        return $result;
+    }
+
+    private function UNQUOTED()
+    {
+        $result = '';
+
+        while ($this->valid()) {
+            if ($this->current() == self::TOKEN_SPACE) {
+                $this->next();
+                break;
+            } else {
+                $result .= $this->current();
+            }
+            $this->next();
+        }
+
+        return $result;
+    }
+
+    public static function parseString($input)
+    {
+        $parser = new self($input);
+
+        return $parser->parse();
+    }
+}

src/App/Utility/StringIterator.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Utility;
+
+class StringIterator implements \Iterator
+{
+    private $string;
+
+    private $current;
+
+    public function __construct($string)
+    {
+        $this->string = $string;
+    }
+
+    public function current()
+    {
+        return $this->string[$this->current];
+    }
+
+    public function next()
+    {
+        ++$this->current;
+    }
+
+    public function key()
+    {
+        return $this->current;
+    }
+
+    public function valid()
+    {
+        return $this->current < strlen($this->string);
+    }
+
+    public function rewind()
+    {
+        $this->current = 0;
+    }
+}