/*
 * intern.h
 *
 * For now this implements an oblist and shallow binding; local environments can
 * be consed onto the front of the oblist. Later, this won't do; bindings will happen
 * in namespaces, which will probably be implemented as hash tables.
 *
 * Doctrine is that cons cells are immutable, and life is a lot more simple if they are;
 * so when a symbol is rebound in the master oblist, what in fact we do is construct
 * a new oblist without the previous binding but with the new binding. Anything which,
 * prior to this action, held a pointer to the old oblist (as all current threads'
 * environments must do) continues to hold a pointer to the old oblist, and consequently
 * doesn't see the change. This is probably good but does mean you cannot use bindings
 * on the oblist to signal between threads.
 *
 * (c) 2017 Simon Brooke <simon@journeyman.cc>
 * Licensed under GPL version 2.0, or, at your option, any later version.
 */

#ifndef __intern_h
#define __intern_h

extern struct cons_pointer oblist;

struct cons_pointer c_assoc( struct cons_pointer key,
                             struct cons_pointer store );

struct cons_pointer internedp( struct cons_pointer key,
                               struct cons_pointer environment );

struct cons_pointer set( struct cons_pointer key,
                         struct cons_pointer value,
                         struct cons_pointer store );

struct cons_pointer deep_bind( struct cons_pointer key,
                               struct cons_pointer value );

struct cons_pointer intern( struct cons_pointer key,
                            struct cons_pointer environment );

#endif