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vendor/yiisoft/yii2/db/pgsql/ArrayParser.php

@@ -0,0 +1,109 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\pgsql;
+
+/**
+ * The class converts PostgreSQL array representation to PHP array
+ *
+ * @author Sergei Tigrov <rrr-r@ya.ru>
+ * @author Dmytro Naumenko <d.naumenko.a@gmail.com>
+ * @since 2.0.14
+ */
+class ArrayParser
+{
+    /**
+     * @var string Character used in array
+     */
+    private $delimiter = ',';
+
+
+    /**
+     * Convert array from PostgreSQL to PHP
+     *
+     * @param string $value string to be converted
+     * @return array|null
+     */
+    public function parse($value)
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        if ($value === '{}') {
+            return [];
+        }
+
+        return $this->parseArray($value);
+    }
+
+    /**
+     * Pares PgSQL array encoded in string
+     *
+     * @param string $value
+     * @param int $i parse starting position
+     * @return array
+     */
+    private function parseArray($value, &$i = 0)
+    {
+        $result = [];
+        $len = strlen($value);
+        for (++$i; $i < $len; ++$i) {
+            switch ($value[$i]) {
+                case '{':
+                    $result[] = $this->parseArray($value, $i);
+                    break;
+                case '}':
+                    break 2;
+                case $this->delimiter:
+                    if (empty($result)) { // `{}` case
+                        $result[] = null;
+                    }
+                    if (in_array($value[$i + 1], [$this->delimiter, '}'], true)) { // `{,}` case
+                        $result[] = null;
+                    }
+                    break;
+                default:
+                    $result[] = $this->parseString($value, $i);
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Parses PgSQL encoded string
+     *
+     * @param string $value
+     * @param int $i parse starting position
+     * @return null|string
+     */
+    private function parseString($value, &$i)
+    {
+        $isQuoted = $value[$i] === '"';
+        $stringEndChars = $isQuoted ? ['"'] : [$this->delimiter, '}'];
+        $result = '';
+        $len = strlen($value);
+        for ($i += $isQuoted ? 1 : 0; $i < $len; ++$i) {
+            if (in_array($value[$i], ['\\', '"'], true) && in_array($value[$i + 1], [$value[$i], '"'], true)) {
+                ++$i;
+            } elseif (in_array($value[$i], $stringEndChars, true)) {
+                break;
+            }
+
+            $result .= $value[$i];
+        }
+
+        $i -= $isQuoted ? 0 : 1;
+
+        if (!$isQuoted && $result === 'NULL') {
+            $result = null;
+        }
+
+        return $result;
+    }
+}