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/* Copyright (C) 2020 Free Software Foundation, Inc.
Author: Andrea Corallo <akrl@sdf.org>
This file is part of GNU Emacs.
GNU Emacs 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.
GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "lisp.h"
/* Store lexnumber in closure + set lexspace calling subrs. */
static void
lexspace_copy (EMACS_INT dst, EMACS_INT src)
{
Lisp_Object tail;
for (ptrdiff_t i = ASIZE (Vobarray) - 1; i >= 0; i--)
{
tail = AREF (Vobarray, i);
if (SYMBOLP (tail))
while (1)
{
struct Lisp_Symbol *sym = XSYMBOL (tail);
if (sym->u.s.redirect == SYMBOL_PLAINVAL
&& !EQ (sym->u.s.val.value, Qunbound))
{
struct Lisp_Binding *binding = XBINDING (sym->u.s.val.value);
binding->r[dst] = true;
binding->b[dst] = make_fixnum (src);
}
if (!NILP (sym->u.s._function))
{
struct Lisp_Binding *binding = XBINDING (sym->u.s._function);
binding->r[dst] = true;
binding->b[dst] = make_fixnum (src);
}
if (sym->u.s.next == 0)
break;
XSETSYMBOL (tail, sym->u.s.next);
}
}
}
/**********************************/
/* Entry points exposed to Lisp. */
/**********************************/
DEFUN ("lexspace-make", Flexspace_make, Slexspace_make, 2, 2, 0,
doc: /* Make lexspace NAME from SRC. */)
(Lisp_Object name, Lisp_Object src)
{
CHECK_SYMBOL (name);
CHECK_SYMBOL (src);
EMACS_INT lexspace_num = XFIXNUM (Fhash_table_count (Vlexspaces));
if (lexspace_num == MAX_LEXSPACES)
error ("Max number of lexspaces reached");
Lisp_Object src_idx = Fgethash (src, Vlexspaces, Qnil);
if (NILP (src_idx))
error ("lexspace %s does not exists", SSDATA (SYMBOL_NAME (src)));
Fputhash (name, make_fixnum (lexspace_num), Vlexspaces);
lexspace_copy (lexspace_num, XFIXNUM (src_idx));
return name;
}
DEFUN ("lexspace-import-symbol", Flexspace_import_symbol,
Slexspace_import_symbol, 2, 2, 0,
doc: /* Import SYMBOL binding from lexspace SRC. */)
(Lisp_Object symbol, Lisp_Object src)
{
CHECK_SYMBOL (symbol);
CHECK_SYMBOL (src);
Lisp_Object src_idx = Fgethash (src, Vlexspaces, Qnil);
if (NILP (src_idx))
error ("lexspace %s does not exists", SSDATA (SYMBOL_NAME (src)));
struct Lisp_Symbol *sym = XSYMBOL (symbol);
if (!EQ (sym->u.s.val.value, Qunbound))
{
struct Lisp_Binding *binding = XBINDING (sym->u.s.val.value);
binding->r[CURRENT_LEXSPACE] = true;
binding->b[CURRENT_LEXSPACE] = src_idx;
}
if (!NILP (sym->u.s._function))
{
struct Lisp_Binding *binding = XBINDING (sym->u.s._function);
binding->r[CURRENT_LEXSPACE] = true;
binding->b[CURRENT_LEXSPACE] = src_idx;
}
return symbol;
}
DEFUN ("lexspace-in", Flexspace_in, Slexspace_in, 1, 1, 0,
doc: /* Set NAME as current lexspace. */)
(Lisp_Object name)
{
CHECK_SYMBOL (name);
Lisp_Object src_idx = Fgethash (name, Vlexspaces, Qnil);
if (NILP (src_idx))
error ("lexspace %s does not exists", SSDATA (SYMBOL_NAME (name)));
Vcurrent_lexspace_idx = src_idx;
return name;
}
void
syms_of_lexspaces (void)
{
DEFSYM (Qbinding, "binding");
DEFSYM (Qel, "el");
DEFSYM (Qcurrent_lexspace_idx, "current-lexspace-idx");
/* Internal use! */
DEFVAR_LISP ("lexspaces", Vlexspaces,
doc: /* Internal use. */);
Vlexspaces = CALLN (Fmake_hash_table, QCtest, Qeq);
Fputhash (Qel, make_fixnum (0), Vlexspaces);
DEFVAR_LISP ("current-lexspace-idx", Vcurrent_lexspace_idx,
doc: /* Internal use. */);
defsubr (&Slexspace_in);
defsubr (&Slexspace_import_symbol);
defsubr (&Slexspace_make);
}
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