125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/* -*-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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deep_variable_ref (struct scm *var)
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{
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assert_variable (1, var);
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struct scm *ref = var->variable;
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struct scm *value = ref->cdr;
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if (value == cell_undefined)
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error (cell_symbol_unbound_variable, var);
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if (value->type == TVARIABLE)
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value = value->variable;
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return value;
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}
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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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struct scm *value = var->variable;
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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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struct scm *
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handle_set_x (struct scm *handle, struct scm *value)
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{
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struct scm *x = handle->cdr;
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if (x->type == TVARIABLE)
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x->variable = value;
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else
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handle->cdr = value;
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return cell_unspecified;
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}
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/*
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GUILE has `proc': scm_current_module -> scm_module_lookup_closure -> standard-eval-closure:
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BUT: define-p: module-make-local-var!, !define-p: module-variable
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*/
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struct scm *
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lookup_handle (struct scm *name, struct scm *define_p)
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{
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struct scm *handle = handle = assq (name, R0);
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if (handle == cell_f)
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{
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struct scm *module = current_module ();
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if (define_p == cell_f)
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{
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if (module == M0)
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handle = hashq_get_handle_ (M0, name);
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else
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handle = module_handle (module, name);
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}
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else
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{
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struct scm *table = module_defines (module);
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handle = hashq_get_handle_ (table, name);
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if (handle == cell_f)
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handle = hashq_set_handle_x (table, name, cell_f);
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}
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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_ref (struct scm *name, struct scm *bound_p)
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{
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struct scm *handle = lookup_handle (name, cell_f);
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if (handle->type == TPAIR)
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return handle->cdr;
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if (bound_p == cell_t)
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error (cell_symbol_unbound_variable, name);
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return cell_undefined;
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}
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struct scm *
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lookup_ref_ (char const *name)
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{
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return lookup_ref (cstring_to_symbol (name), cell_f);
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}
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