Swift: Copy the 'parse' test from Ruby.

swift/ql/test/library-tests/regex/parse.ql

@@ -0,0 +1,27 @@
+/**
+ * @kind graph
+ */
+
+import swift
+import codeql.swift.regex.Regex as RE
+
+query predicate nodes(RE::RegExpTerm n, string attr, string val) {
+  attr = "semmle.label" and
+  val = "[" + concat(n.getAPrimaryQlClass(), ", ") + "] " + n.toString()
+  or
+  attr = "semmle.order" and
+  val =
+    any(int i |
+      n =
+        rank[i](RE::RegExpTerm t, string fp, int sl, int sc, int el, int ec |
+          t.hasLocationInfo(fp, sl, sc, el, ec)
+        |
+          t order by fp, sl, sc, el, ec, t.toString()
+        )
+    ).toString()
+}
+
+query predicate edges(RE::RegExpTerm pred, RE::RegExpTerm succ, string attr, string val) {
+  attr in ["semmle.label", "semmle.order"] and
+  val = any(int i | succ = pred.getChild(i)).toString()
+}