Install psalm as dev, sync scripts updates

vendor/felixfbecker/language-server-protocol/src/Position.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+/**
+ * Position in a text document expressed as zero-based line and character offset.
+ */
+class Position
+{
+    /**
+     * Line position in a document (zero-based).
+     *
+     * @var int
+     */
+    public $line;
+
+    /**
+     * Character offset on a line in a document (zero-based).
+     *
+     * @var int
+     */
+    public $character;
+
+    public function __construct(int $line = null, int $character = null)
+    {
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->line = $line;
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->character = $character;
+    }
+
+    /**
+     * Compares this position to another position
+     * Returns
+     *  - 0 if the positions match
+     *  - a negative number if $this is before $position
+     *  - a positive number otherwise
+     *
+     * @param Position $position
+     * @return int
+     */
+    public function compare(Position $position): int
+    {
+        if ($this->line === $position->line && $this->character === $position->character) {
+            return 0;
+        }
+
+        if ($this->line !== $position->line) {
+            return $this->line - $position->line;
+        }
+
+        return $this->character - $position->character;
+    }
+
+    /**
+     * Returns the offset of the position in a string
+     *
+     * @param string $content
+     * @return int
+     */
+    public function toOffset(string $content): int
+    {
+        $lines = explode("\n", $content);
+        $slice = array_slice($lines, 0, $this->line);
+        return array_sum(array_map('strlen', $slice)) + count($slice) + $this->character;
+    }
+}