feat(demo): add story 1 — Sorano: Rock and Time

plugins/admin/vendor/scssphp/source-span/src/FileSpan.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace SourceSpan;
+
+interface FileSpan extends SourceSpanWithContext
+{
+    public function getFile(): SourceFile;
+
+    public function getStart(): FileLocation;
+
+    public function getEnd(): FileLocation;
+
+    public function expand(FileSpan $other): FileSpan;
+
+    /**
+     * Return a span from $start bytes (inclusive) to $end bytes
+     * (exclusive) after the beginning of this span
+     */
+    public function subspan(int $start, ?int $end = null): FileSpan;
+}