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/*
* cook - file construction tool
* Copyright (C) 1997, 1998 Peter Miller;
* All rights reserved.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate exprs
*/
#include <sub/expr.h>
#include <sub/expr_gram.h>
#include <sub/private.h>
#include <str.h>
#include <trace.h>
#include <wstr_list.h>
wstring_ty *
sub_expression(scp, arg)
sub_context_ty *scp;
wstring_list_ty *arg;
{
wstring_ty *ws;
string_ty *s1;
string_ty *s2;
wstring_ty *result;
/*
* Check the number of arguments
*/
trace(("sub_expression()\n{\n"/*}*/));
if (arg->nitems < 2)
{
sub_context_error_set
(
scp,
i18n("requires at least one argument")
);
trace(("return NULL;\n"));
trace((/*{*/"}\n"));
return 0;
}
/*
* Fold all of the arguments into a single string,
* and parse that string for an expression.
*/
ws = wstring_list_to_wstring(arg, 1, arg->nitems, " ");
s1 = wstr_to_str(ws);
trace(("s1 = \"%s\";\n", s1->str_text));
wstr_free(ws);
s2 = sub_expr_gram(scp, s1);
str_free(s1);
if (!s2)
{
trace(("return NULL;\n"));
trace((/*{*/"}\n"));
return 0;
}
/*
* Turn the result of the parse into a wide string.
*/
trace(("result = \"%s\";\n", s2->str_text));
result = str_to_wstr(s2);
str_free(s2);
trace(("return %8.8lX;\n", (long)result));
trace((/*{*/"}\n"));
return result;
}
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