/usr/share/octave/packages/io-2.4.5/getxmlnode.m is in octave-io 2.4.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | ## Copyright (C) 2013-2016 Philip Nienhuis
##
## 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 3 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} [ @var{node}, @var{s}, @var{e} ] = getxmlnode (@var{xml}, @var{tag})
## @deftypefnx {Function File} [ @var{node}, @var{s}, @var{e} ] = getxmlnode (@var{xml}, @var{tag}, @var{is})
## @deftypefnx {Function File} [ @var{node}, @var{s}, @var{e} ] = getxmlnode (@var{xml}, @var{tag}, @var{is}, @var{contnt})
## Get a string representing the first xml @var{tag} node starting at position
## @var{is} in xml text string @var{xml}, and return start and end indices. If
## @var{is} is omitted it defaults to 1 (start of @var{xml}). If @var{contnt}
## is TRUE, return the portion of the node between the outer tags.
##
## @seealso{getxmlattv}
## @end deftypefn
## Author: Philip Nienhuis <prnienhuis at users.sf.net>
## Created: 2013-09-08
function [ node, spos, epos ] = getxmlnode (xml, tag, is=1, contnt=0)
if (nargin < 2)
print_usage;
endif
if (nargin >= 3 && isempty (is))
is = 1;
endif
## Input validation
if (! ischar (xml) || ! ischar (tag))
error ("getxmlnode: text strings expected for first two args\n");
elseif (nargin==3 && (! islogical (is) && ! isnumeric (is)))
error ("getxmlnode: logical or numerical value expected for arg #3\n");
elseif (nargin==4 && (! islogical (contnt) && ! isnumeric (contnt)))
error ("getxmlnode: logical or numerical value expected for arg #3\n");
endif
is = max (is, 1);
node = '';
## Start tag must end with either />, a space preceding an attribute, or >
## Search order is vital as /> (single node) is otherwise easily missed
spos = regexp (xml(is:end), sprintf ("<%s(/>| |>)", tag), "once");
if (! isempty (spos))
## Apparently a node exists. Get its end. Maybe it is a single node
## ending in "/>"
spos = spos(1);
[~, epos] = regexp (xml(is+spos:end), sprintf ("(</%s>|%s[^><]*/>)", tag, tag), "once");
if (! isempty (epos))
epos = epos(1);
node = xml(is+spos-1 : is+spos+epos(1)-1);
if (contnt)
if (strcmp (node(end-1:end), "/>"))
## Single node tag. Return empty string
node = '';
else
## Get contents between end of opening tag en start of end tag
node = node(index (node, ">", "first")+1 : index (node, "<", "last")-1);
endif
endif
else
error ("getxmlnode: couldn't find matching end tag for %s", tag);
endif
## Update position pointers relative to input string
epos += is + spos - 1;
spos += is - 1;
else
## No node found; reset pointers
spos = 0;
epos = 0;
endif
endfunction
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