2019-11-10 18:18:36 +00:00
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU 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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* GNU 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mes/lib.h"
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#include "mes/mes.h"
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struct scm *
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variable_ref (struct scm *var)
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{
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assert_variable (1, var);
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2019-11-14 08:54:22 +00:00
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struct scm *ref = var->variable;
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struct scm *value = ref->cdr;
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2019-11-10 18:18:36 +00:00
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if (value == cell_undefined)
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error (cell_symbol_unbound_variable, var);
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return value;
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}
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struct scm *
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variable_set_x (struct scm *var, struct scm *value)
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{
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assert_variable (1, var);
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var->variable = value;
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return cell_unspecified;
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}
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struct scm *
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variable_bound_p (struct scm *var)
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{
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assert_variable (1, var);
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struct scm *value = var->variable;
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if (value != cell_undefined)
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return cell_t;
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return cell_f;
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}
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2019-11-14 08:50:52 +00:00
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struct scm *
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lookup_variable (struct scm *lookup, struct scm *name, struct scm *define_p)
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{
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struct scm *handle = cell_f;
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if (lookup->type = TPAIR)
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handle = assq (name, lookup);
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if (handle == cell_f)
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{
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handle = hashq_get_handle_ (M0, name, cell_f);
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if (handle == cell_f && define_p == cell_t)
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handle = hashq_set_handle_x (M0, name, cell_f);
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}
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return handle;
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}
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struct scm *
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lookup_variable_ (struct scm *lookup, char const* name)
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{
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return lookup_variable (lookup, cstring_to_symbol (name), cell_f);
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}
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struct scm *
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lookup_ref (struct scm *lookup, struct scm *name)
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{
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struct scm *x = lookup_variable (lookup, name, cell_f);
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if (x == cell_f)
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error (cell_symbol_unbound_variable, name);
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return x->cdr;
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}
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