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########################################################################
##
## Copyright (C) 2020-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{fobj} =} inline (@var{str})
## @deftypefnx {} {@var{fobj} =} inline (@var{str}, @var{arg1}, @dots{})
## @deftypefnx {} {@var{fobj} =} inline (@var{str}, @var{n})
##
## This function is obsolete. Use anonymous functions
## (@pxref{Anonymous Functions}) instead.
##
## Create an inline function object from the character string @var{str}.
##
## If called with a single argument, the arguments of the generated
## function are extracted from the function itself. The generated
## function arguments will then be in alphabetical order. It should be
## noted that i and j are ignored as arguments due to the ambiguity
## between their use as a variable and their use as an built-in constant.
## All arguments followed by a parenthesis are considered to be
## functions. If no arguments are found, a function taking a single
## argument named @code{x} will be created.
##
## If the second and subsequent arguments are character strings, they
## are the names of the arguments of the function.
##
## If the second argument is an integer @var{n}, the arguments are
## @qcode{"x"}, @qcode{"P1"}, @dots{}, @qcode{"P@var{N}"}.
##
## @strong{Caution:} the use of @code{inline} is discouraged and it may
## be removed from a future version of Octave. The preferred way to
## create functions from strings is through the use of anonymous
## functions (@pxref{Anonymous Functions}) or @code{str2func}.
## @seealso{argnames, formula, vectorize, str2func}
## @end deftypefn
function fobj = inline (expr, varargin)
persistent warned = false;
if (! warned)
warned = true;
warning ("Octave:legacy-function",
"inline is obsolete; use anonymous functions instead\n");
endif
if (nargin == 0)
print_usage ();
endif
if (! ischar (expr))
error ("inline: EXPR must be a string");
endif
if (nargin == 1)
args = parse_expr_for_args (expr);
elseif (nargin == 2)
n = varargin{1};
if (isnumeric (n))
if (isscalar (n) && fix (n) == n)
if (n > 0)
args = strsplit (["x", sprintf(":P%d", 1:n)], ":");
else
error ("inline: N must be a positive integer");
endif
else
error ("inline: N must be an integer");
endif
else
args = {"x"};
endif
elseif (iscellstr (varargin))
args = varargin;
else
error ("inline: additional arguments must be strings");
endif
p.expr = expr;
p.args = args(:);
p.nargs = numel (args);
p.fh = eval (sprintf ("@(%s) %s", strjoin (args(:), ","), expr));
## FIXME: Do we need these parts of inline struct anymore (4/6/22)?
tmp = [args; num2cell(1:numel(args))];
p.inputExpr = sprintf ("%s = INLINE_INPUTS_{%d}; ", tmp{:});
p.isEmpty = false;
p.version = 1;
fobj = __inline_ctor__ (p);
endfunction
## The following function was translated directly from the original C++
## version. Yes, it will be slow, but the use of inline functions is
## strongly discouraged anyway, and most expressions will probably be
## short. It may also be buggy. Well, don't use this object! Use
## function handles instead!
function args = parse_expr_for_args (expr)
persistent symbols_to_skip = {"i", "j", "NaN", "nan", "Inf", "inf", ...
"NA", "pi", "e", "eps"};
is_arg = false;
in_string = false;
tmp_arg = "";
i = 1;
expr_length = length (expr);
args = {};
while (i <= expr_length)
terminate_arg = false;
c = expr(i++);
if (in_string)
if (c == "'" || c == '"')
in_string = false;
endif
elseif (c == "'" || c == '"')
in_string = true;
if (is_arg)
terminate_arg = true;
endif
elseif (! isalpha (c) && c != "_")
if (! is_arg)
continue;
elseif (isdigit (c))
tmp_arg(end+1) = c;
else
## Before we do anything remove trailing whitespaces.
while (i <= expr_length && isspace (c))
c = expr(i++);
endwhile
## Do we have a variable or a function?
if (c != "(")
terminate_arg = true;
else
tmp_arg = "";
is_arg = false;
endif
endif
elseif (! is_arg)
if (c == "e" || c == "E")
## Possible number in exponent form, not arg.
if (isdigit (expr(i)) || expr(i) == "-" || expr(i) == "+")
continue;
endif
endif
is_arg = true;
tmp_arg(end+1) = c;
else
tmp_arg(end+1) = c;
endif
if (terminate_arg || (i == expr_length+1 && is_arg))
have_arg = false;
if (any (strcmp (tmp_arg, args)))
have_arg = true;
endif
if (! (have_arg || any (strcmp (tmp_arg, symbols_to_skip))))
args{end+1} = tmp_arg;
endif
tmp_arg = "";
is_arg = false;
endif
endwhile
## Sort the arguments into ASCII order.
args = sort (args);
if (isempty (args))
args = {"x"};
endif
endfunction
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