comparison vendor/psy/psysh/src/Readline/Libedit.php @ 13:5fb285c0d0e3

Update Drupal core to 8.4.7 via Composer. Security update; I *think* we've
been lucky to get away with this so far, as we don't support self-registration
which seems to be used by the so-called "drupalgeddon 2" attack that 8.4.5
was vulnerable to.

+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Readline;
+
+use Psy\Util\Str;
+
+/**
+ * A Libedit-based Readline implementation.
+ *
+ * This is largely the same as the Readline implementation, but it emulates
+ * support for `readline_list_history` since PHP decided it was a good idea to
+ * ship a fake Readline implementation that is missing history support.
+ */
+class Libedit extends GNUReadline
+{
+    /**
+     * Let's emulate GNU Readline by manually reading and parsing the history file!
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return function_exists('readline') && !function_exists('readline_list_history');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listHistory()
+    {
+        $history = file_get_contents($this->historyFile);
+        if (!$history) {
+            return [];
+        }
+
+        // libedit doesn't seem to support non-unix line separators.
+        $history = explode("\n", $history);
+
+        // shift the history signature, ensure it's valid
+        if (array_shift($history) !== '_HiStOrY_V2_') {
+            return [];
+        }
+
+        // decode the line
+        $history = array_map([$this, 'parseHistoryLine'], $history);
+        // filter empty lines & comments
+        return array_values(array_filter($history));
+    }
+
+    /**
+     * From GNUReadline (readline/histfile.c & readline/histexpand.c):
+     * lines starting with "\0" are comments or timestamps;
+     * if "\0" is found in an entry,
+     * everything from it until the next line is a comment.
+     *
+     * @param string $line The history line to parse
+     *
+     * @return string | null
+     */
+    protected function parseHistoryLine($line)
+    {
+        // empty line, comment or timestamp
+        if (!$line || $line[0] === "\0") {
+            return;
+        }
+        // if "\0" is found in an entry, then
+        // everything from it until the end of line is a comment.
+        if (($pos = strpos($line, "\0")) !== false) {
+            $line = substr($line, 0, $pos);
+        }
+
+        return ($line !== '') ? Str::unvis($line) : null;
+    }
+}