Ruby: add db upgrade script

Author: nickrolfe

ruby/ql/lib/upgrades/24d81950f3ab7e67e14553e1a5111a04e8ae8445/erb_ast_node_info.ql

@@ -0,0 +1,26 @@
+class Location extends @location {
+  string toString() { none() }
+}
+
+class ErbAstNodeParent extends @erb_ast_node_parent {
+  string toString() { none() }
+}
+
+class ErbAstNode extends @erb_ast_node {
+  string toString() { none() }
+
+  ErbAstNodeParent getParent(int index) { erb_ast_node_parent(this, result, index) }
+
+  Location getLocation() {
+    erb_tokeninfo(this, _, _, result) or
+    erb_comment_directive_def(this, _, result) or
+    erb_directive_def(this, _, result) or
+    erb_graphql_directive_def(this, _, result) or
+    erb_output_directive_def(this, _, result) or
+    erb_template_def(this, result)
+  }
+}
+
+from ErbAstNode node, ErbAstNodeParent parent, int index, Location loc
+where parent = node.getParent(index) and loc = node.getLocation()
+select node, parent, index, loc