Ruby: Add up/downgrade scripts (sigh)

Author: hvitved

ruby/downgrades/440de75c71e9206ce16eed49a22c76e7889b5fc3/erb_ast_node_info.ql

@@ -0,0 +1,44 @@
+class TAstNodeParent = @file or @erb_ast_node;
+
+abstract class AstNodeParent extends TAstNodeParent {
+  string toString() { none() }
+}
+
+class AstNode extends AstNodeParent, @erb_ast_node { }
+
+class File extends AstNodeParent, @file { }
+
+class Location extends @location_default {
+  string toString() { none() }
+}
+
+pragma[nomagic]
+predicate hasFileParent(
+  AstNode n, File f, int startline, int startcolumn, int endline, int endcolumn
+) {
+  exists(Location loc |
+    not erb_ast_node_parent(n, _, _) and
+    erb_ast_node_location(n, loc) and
+    locations_default(loc, f, startline, startcolumn, endline, endcolumn)
+  )
+}
+
+pragma[nomagic]
+predicate hasFileParent(AstNode n, File f, int i) {
+  n =
+    rank[i + 1](AstNode n0, int startline, int startcolumn, int endline, int endcolumn |
+      hasFileParent(n0, f, startline, startcolumn, endline, endcolumn)
+    |
+      n0 order by startline, startcolumn, endline, endcolumn
+    )
+}
+
+from AstNode n, AstNodeParent parent, int i, Location location
+where
+  erb_ast_node_location(n, location) and
+  (
+    erb_ast_node_parent(n, parent, i)
+    or
+    hasFileParent(n, parent, i)
+  )
+select n, parent, i, location