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https://github.com/libguestfs/libguestfs.git
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61d4891ef4
The new module ‘Std_utils’ contains only functions which are pure OCaml and depend only on the OCaml stdlib. Therefore these functions may be used by the generator. The new module is moved to ‘common/mlstdutils’. This also removes the "<stdlib>" hack, and the code which copied the library around. Also ‘Guestfs_config’, ‘Libdir’ and ‘StringMap’ modules are moved since these are essentially the same. The bulk of this change is just updating files which use ‘open Common_utils’ to add ‘open Std_utils’ where necessary.
55 lines
1.9 KiB
OCaml
55 lines
1.9 KiB
OCaml
(* virt-v2v
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* Copyright (C) 2009-2017 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*)
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open Printf
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open Std_utils
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open Common_utils
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open Common_gettext.Gettext
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(* Parse an xpath expression and return a string/int. Returns
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* [Some v], or [None] if the expression doesn't match.
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*)
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let xpath_eval parsefn xpathctx expr =
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let obj = Xml.xpath_eval_expression xpathctx expr in
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if Xml.xpathobj_nr_nodes obj < 1 then None
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else (
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let node = Xml.xpathobj_node obj 0 in
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let str = Xml.node_as_string node in
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try Some (parsefn str)
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with Failure _ ->
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error (f_"expecting XML expression to return an integer (expression: %s, matching string: %s)")
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expr str
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)
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let xpath_string = xpath_eval identity
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let xpath_int = xpath_eval int_of_string
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let xpath_int64 = xpath_eval Int64.of_string
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(* Parse an xpath expression and return a string/int; if the expression
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* doesn't match, return the default.
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*)
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let xpath_eval_default parsefn xpath expr default =
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match xpath_eval parsefn xpath expr with
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| None -> default
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| Some s -> s
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let xpath_string_default = xpath_eval_default identity
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let xpath_int_default = xpath_eval_default int_of_string
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let xpath_int64_default = xpath_eval_default Int64.of_string
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