Metadata parser.

[virt-top.git] / virt-df / virt_df_lvm2_metadata.ml

diff --git a/virt-df/virt_df_lvm2_metadata.ml b/virt-df/virt_df_lvm2_metadata.ml
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+(* 'df' command for virtual domains.  -*- text -*-
+   (C) Copyright 2007-2008 Richard W.M. Jones, Red Hat Inc.
+   http://libvirt.org/
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *)
+
+(* Part of the parser for LVM2 metadata. *)
+
+type metadata = metastmt list
+
+and metastmt = string * metavalue
+
+and metavalue =
+  | Metadata of metadata               (* name { ... } *)
+  | String of string                   (* name = "..." *)
+  | Int of int64
+  | Float of float
+  | List of metavalue list             (* name = [...] *)
+
+let rec output_metadata chan md =
+  _output_metadata chan "" md
+
+and _output_metadata chan prefix = function
+  | [] -> ()
+  | (name, value) :: rest ->
+      output_string chan prefix;
+      output_string chan name;
+      output_string chan " = ";
+      output_metavalue chan prefix value;
+      output_string chan "\n";
+      _output_metadata chan prefix rest
+
+and output_metavalue chan prefix = function
+  | Metadata md ->
+      output_string chan "{\n";
+      _output_metadata chan (prefix ^ "  ") md;
+      output_string chan prefix;
+      output_string chan "}\n";
+  | String str ->
+      output_char chan '"';
+      output_string chan str;
+      output_char chan '"';
+  | Int i ->
+      output_string chan (Int64.to_string i)
+  | Float f ->
+      output_string chan (string_of_float f)
+  | List [] -> ()
+  | List [x] -> output_metavalue chan prefix x
+  | List (x :: xs) ->
+      output_metavalue chan prefix x;
+      output_string chan ", ";
+      output_metavalue chan prefix (List xs)