15eabee623
* mes.c (the_unsyntaxers): New symbol. (mes_builtins)[QUASISYNTAX]: Initialize it, add to environment. * quasiquote.c (add_unsyntaxers): Use it. (vm_eval_quasisyntax): New function. (eval_quasisyntax): Use it.
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* Mes --- Maxwell Equations of Software
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* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of Mes.
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*
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* Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if QUASIQUOTE
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SCM
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unquote (SCM x) ///((no-environment))
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{
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return cons (cell_symbol_unquote, x);
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}
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SCM
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unquote_splicing (SCM x) ///((no-environment))
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{
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return cons (cell_symbol_unquote_splicing, x);
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}
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SCM
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eval_quasiquote (SCM e, SCM a)
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{
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return vm_call (vm_eval_quasiquote, e, cell_undefined, a);
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}
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SCM
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vm_eval_quasiquote ()
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{
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if (r1 == cell_nil) return r1;
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else if (atom_p (r1) == cell_t) return r1;
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else if (eq_p (car (r1), cell_symbol_unquote) == cell_t)
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return eval_env (cadr (r1), r0);
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else if (TYPE (r1) == PAIR && TYPE (car (r1)) == PAIR
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&& eq_p (caar (r1), cell_symbol_unquote_splicing) == cell_t)
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{
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r2 = eval_env (cadar (r1), r0);
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return append2 (r2, eval_quasiquote (cdr (r1), r0));
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}
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r2 = eval_quasiquote (car (r1), r0);
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return cons (r2, eval_quasiquote (cdr (r1), r0));
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}
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SCM
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add_unquoters (SCM a)
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{
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SCM q = assq_ref_cache (cell_symbol_the_unquoters, a);
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return append2 (q, a);
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}
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#else // !QUASIQUOTE
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SCM add_unquoters (SCM a){}
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SCM eval_quasiquote (SCM e, SCM a){}
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SCM unquote (SCM x){}
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SCM unquote_splicing (SCM x){}
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SCM vm_eval_quasiquote () {}
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#endif // QUASIQUOTE
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#if QUASISYNTAX
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SCM
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syntax (SCM x)
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{
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return cons (cell_symbol_syntax, x);
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}
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SCM
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unsyntax (SCM x) ///((no-environment))
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{
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return cons (cell_symbol_unsyntax, x);
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}
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SCM
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unsyntax_splicing (SCM x) ///((no-environment))
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{
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return cons (cell_symbol_unsyntax_splicing, x);
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}
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SCM
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eval_quasisyntax (SCM e, SCM a)
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{
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return vm_call (vm_eval_quasisyntax, e, cell_undefined, a);
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}
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SCM
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vm_eval_quasisyntax ()
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{
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if (r1 == cell_nil) return r1;
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else if (atom_p (r1) == cell_t) return r1;
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else if (eq_p (car (r1), cell_symbol_unsyntax) == cell_t)
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return eval_env (cadr (r1), r0);
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else if (TYPE (r1) == PAIR && TYPE (car (r1)) == PAIR
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&& eq_p (caar (r1), cell_symbol_unsyntax_splicing) == cell_t)
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{
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r2 = eval_env (cadar (r1), r0);
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return append2 (r2, eval_quasisyntax (cdr (r1), r0));
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}
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r2 = eval_quasisyntax (car (r1), r0);
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return cons (r2, eval_quasisyntax (cdr (r1), r0));
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}
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SCM
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add_unsyntaxers (SCM a)
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{
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SCM q = assq_ref_cache (cell_symbol_the_unsyntaxers, a);
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return append2 (q, a);
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}
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#else // !QUASISYNTAX
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SCM syntax (SCM x){}
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SCM unsyntax (SCM x){}
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SCM unsyntax_splicing (SCM x){}
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SCM add_unsyntaxers (SCM a){}
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SCM eval_quasisyntax (SCM e, SCM a){}
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SCM vm_eval_quasisyntax () {}
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#endif // !QUASISYNTAX
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