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## Copyright (C) 2016-2020 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 this program. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{dxf} =} dxfread (@var{fname})
## Read a DXF file (text file) into a Nx3 cell array.
##
## @var{fname} is the file name or full path name of a text format (not
## binary) DXF file, with or without "dxf" extension.
##
## Output variable @var{dxf} is a cell array with DXF codes in column 1,
## the corresponding DXF text info (or empty string) in column 2, and
## corresponding numeric values (or NaN) in column 3. Use dxfparse for
## converting the output into a DXF drawing struct or separate mapstructs
## for each ENTITY type in the DXF file.
##
## @seealso{dxfparse, dxfdraw}
## @end deftypefn
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2016-01-25
function [dxf] = dxfread (fname)
if (! ischar (fname))
print_usage ();
endif
[pth, fn, ext] = fileparts (fname);
if (isempty (ext))
ext = ".dxf";
fname = [fname ext];
elseif (! strcmpi (ext, ".dxf"))
error ("dxfread: file is no .DXF file");
endif
fid = fopen (fname);
if (fid < 0)
error ("file %s not found", fname);
else
txt = fread (fid, Inf, "char=>char")';
fclose (fid);
endif
## Assess EOL character
eol = regexp (txt(1: min (2000, length (txt))), "\r\n", "match", "once");
if (isempty (eol))
eol = "\n";
endif
## DXF files comprise pairs of lines: 1st line = numeric code, 2nd = contents
dxf = reshape (cell2mat ( ...
regexp (txt, sprintf ('(\\d+)%s(.+?)%s', eol, eol), "tokens")), 2, [])';
## Convert col 1 into numeric
dxf(:, 1) = num2cell (str2double (dxf(:, 1)));
## Convert numeric entries in col2 into numeric col3
dxf(:, 3) = num2cell (str2double (dxf(:, 2)));
dxf(! cellfun (@isnan, dxf(:, 3)), 2) = {""};
endfunction
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