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(* virt-v2v
* Copyright (C) 2009-2019 Red Hat Inc.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
open Printf
open Std_utils
open Tools_utils
open Common_gettext.Gettext
(* Parse an xpath expression and return a string/int. Returns
* [Some v], or [None] if the expression doesn't match.
*)
let xpath_eval parsefn xpathctx expr =
let obj = Xml.xpath_eval_expression xpathctx expr in
if Xml.xpathobj_nr_nodes obj < 1 then None
else (
let node = Xml.xpathobj_node obj 0 in
let str = Xml.node_as_string node in
try Some (parsefn str)
with Failure _ ->
error (f_"expecting XML expression to return an integer (expression: %s, matching string: %s)")
expr str
)
let xpath_string = xpath_eval identity
let xpath_int = xpath_eval int_of_string
let xpath_int64 = xpath_eval Int64.of_string
let xpath_get_nodes xpathctx expr =
let obj = Xml.xpath_eval_expression xpathctx expr in
let nodes = ref [] in
for i = 0 to Xml.xpathobj_nr_nodes obj - 1 do
let node = Xml.xpathobj_node obj i in
List.push_front node nodes
done;
List.rev !nodes
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