diff --git a/libguile/environments.c b/libguile/environments.c deleted file mode 100644 index fd4b88300..000000000 --- a/libguile/environments.c +++ /dev/null @@ -1,2226 +0,0 @@ -/* Copyright (C) 1999,2000,2001, 2003, 2006, 2008 Free Software Foundation, Inc. - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public License - * as published by the Free Software Foundation; either version 3 of - * the License, or (at your option) any later version. - * - * This library 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301 USA - */ - - -#ifdef HAVE_CONFIG_H -# include -#endif - -#include "libguile/_scm.h" -#include "libguile/alist.h" -#include "libguile/eval.h" -#include "libguile/hash.h" -#include "libguile/list.h" -#include "libguile/ports.h" -#include "libguile/smob.h" -#include "libguile/symbols.h" -#include "libguile/vectors.h" -#include "libguile/weaks.h" - -#include "libguile/environments.h" - - - -scm_t_bits scm_tc16_environment; -scm_t_bits scm_tc16_observer; -#define DEFAULT_OBARRAY_SIZE 31 - -SCM scm_system_environment; - - - -/* error conditions */ - -/* - * Throw an error if symbol is not bound in environment func - */ -void -scm_error_environment_unbound (const char *func, SCM env, SCM symbol) -{ - /* Dirk:FIXME:: Should throw an environment:unbound type error */ - char error[] = "Symbol `~A' not bound in environment `~A'."; - SCM arguments = scm_cons2 (symbol, env, SCM_EOL); - scm_misc_error (func, error, arguments); -} - - -/* - * Throw an error if func tried to create (define) or remove - * (undefine) a new binding for symbol in env - */ -void -scm_error_environment_immutable_binding (const char *func, SCM env, SCM symbol) -{ - /* Dirk:FIXME:: Should throw an environment:immutable-binding type error */ - char error[] = "Immutable binding in environment ~A (symbol: `~A')."; - SCM arguments = scm_cons2 (env, symbol, SCM_EOL); - scm_misc_error (func, error, arguments); -} - - -/* - * Throw an error if func tried to change an immutable location. - */ -void -scm_error_environment_immutable_location (const char *func, SCM env, SCM symbol) -{ - /* Dirk:FIXME:: Should throw an environment:immutable-location type error */ - char error[] = "Immutable location in environment `~A' (symbol: `~A')."; - SCM arguments = scm_cons2 (env, symbol, SCM_EOL); - scm_misc_error (func, error, arguments); -} - - - -/* generic environments */ - - -/* Create an environment for the given type. Dereferencing type twice must - * deliver the initialized set of environment functions. Thus, type will - * also determine the signature of the underlying environment implementation. - * Dereferencing type once will typically deliver the data fields used by the - * underlying environment implementation. - */ -SCM -scm_make_environment (void *type) -{ - SCM_RETURN_NEWSMOB (scm_tc16_environment, type); -} - - -SCM_DEFINE (scm_environment_p, "environment?", 1, 0, 0, - (SCM obj), - "Return @code{#t} if @var{obj} is an environment, or @code{#f}\n" - "otherwise.") -#define FUNC_NAME s_scm_environment_p -{ - return scm_from_bool (SCM_ENVIRONMENT_P (obj)); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_bound_p, "environment-bound?", 2, 0, 0, - (SCM env, SCM sym), - "Return @code{#t} if @var{sym} is bound in @var{env}, or\n" - "@code{#f} otherwise.") -#define FUNC_NAME s_scm_environment_bound_p -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, FUNC_NAME); - - return scm_from_bool (SCM_ENVIRONMENT_BOUND_P (env, sym)); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_ref, "environment-ref", 2, 0, 0, - (SCM env, SCM sym), - "Return the value of the location bound to @var{sym} in\n" - "@var{env}. If @var{sym} is unbound in @var{env}, signal an\n" - "@code{environment:unbound} error.") -#define FUNC_NAME s_scm_environment_ref -{ - SCM val; - - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, FUNC_NAME); - - val = SCM_ENVIRONMENT_REF (env, sym); - - if (!SCM_UNBNDP (val)) - return val; - else - scm_error_environment_unbound (FUNC_NAME, env, sym); -} -#undef FUNC_NAME - - -/* This C function is identical to environment-ref, except that if symbol is - * unbound in env, it returns the value SCM_UNDEFINED, instead of signalling - * an error. - */ -SCM -scm_c_environment_ref (SCM env, SCM sym) -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, "scm_c_environment_ref"); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, "scm_c_environment_ref"); - return SCM_ENVIRONMENT_REF (env, sym); -} - - -static SCM -environment_default_folder (SCM proc, SCM symbol, SCM value, SCM tail) -{ - return scm_call_3 (proc, symbol, value, tail); -} - - -SCM_DEFINE (scm_environment_fold, "environment-fold", 3, 0, 0, - (SCM env, SCM proc, SCM init), - "Iterate over all the bindings in @var{env}, accumulating some\n" - "value.\n" - "For each binding in @var{env}, apply @var{proc} to the symbol\n" - "bound, its value, and the result from the previous application\n" - "of @var{proc}.\n" - "Use @var{init} as @var{proc}'s third argument the first time\n" - "@var{proc} is applied.\n" - "If @var{env} contains no bindings, this function simply returns\n" - "@var{init}.\n" - "If @var{env} binds the symbol sym1 to the value val1, sym2 to\n" - "val2, and so on, then this procedure computes:\n" - "@lisp\n" - " (proc sym1 val1\n" - " (proc sym2 val2\n" - " ...\n" - " (proc symn valn\n" - " init)))\n" - "@end lisp\n" - "Each binding in @var{env} will be processed exactly once.\n" - "@code{environment-fold} makes no guarantees about the order in\n" - "which the bindings are processed.\n" - "Here is a function which, given an environment, constructs an\n" - "association list representing that environment's bindings,\n" - "using environment-fold:\n" - "@lisp\n" - " (define (environment->alist env)\n" - " (environment-fold env\n" - " (lambda (sym val tail)\n" - " (cons (cons sym val) tail))\n" - " '()))\n" - "@end lisp") -#define FUNC_NAME s_scm_environment_fold -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (scm_is_true (scm_procedure_p (proc)), - proc, SCM_ARG2, FUNC_NAME); - - return SCM_ENVIRONMENT_FOLD (env, environment_default_folder, proc, init); -} -#undef FUNC_NAME - - -/* This is the C-level analog of environment-fold. For each binding in ENV, - * make the call: - * (*proc) (data, symbol, value, previous) - * where previous is the value returned from the last call to *PROC, or INIT - * for the first call. If ENV contains no bindings, return INIT. - */ -SCM -scm_c_environment_fold (SCM env, scm_environment_folder proc, SCM data, SCM init) -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, "scm_c_environment_fold"); - - return SCM_ENVIRONMENT_FOLD (env, proc, data, init); -} - - -SCM_DEFINE (scm_environment_define, "environment-define", 3, 0, 0, - (SCM env, SCM sym, SCM val), - "Bind @var{sym} to a new location containing @var{val} in\n" - "@var{env}. If @var{sym} is already bound to another location\n" - "in @var{env} and the binding is mutable, that binding is\n" - "replaced. The new binding and location are both mutable. The\n" - "return value is unspecified.\n" - "If @var{sym} is already bound in @var{env}, and the binding is\n" - "immutable, signal an @code{environment:immutable-binding} error.") -#define FUNC_NAME s_scm_environment_define -{ - SCM status; - - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, FUNC_NAME); - - status = SCM_ENVIRONMENT_DEFINE (env, sym, val); - - if (scm_is_eq (status, SCM_ENVIRONMENT_SUCCESS)) - return SCM_UNSPECIFIED; - else if (scm_is_eq (status, SCM_ENVIRONMENT_BINDING_IMMUTABLE)) - scm_error_environment_immutable_binding (FUNC_NAME, env, sym); - else - abort(); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_undefine, "environment-undefine", 2, 0, 0, - (SCM env, SCM sym), - "Remove any binding for @var{sym} from @var{env}. If @var{sym}\n" - "is unbound in @var{env}, do nothing. The return value is\n" - "unspecified.\n" - "If @var{sym} is already bound in @var{env}, and the binding is\n" - "immutable, signal an @code{environment:immutable-binding} error.") -#define FUNC_NAME s_scm_environment_undefine -{ - SCM status; - - SCM_ASSERT(SCM_ENVIRONMENT_P(env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT(scm_is_symbol(sym), sym, SCM_ARG2, FUNC_NAME); - - status = SCM_ENVIRONMENT_UNDEFINE (env, sym); - - if (scm_is_eq (status, SCM_ENVIRONMENT_SUCCESS)) - return SCM_UNSPECIFIED; - else if (scm_is_eq (status, SCM_ENVIRONMENT_BINDING_IMMUTABLE)) - scm_error_environment_immutable_binding (FUNC_NAME, env, sym); - else - abort(); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_set_x, "environment-set!", 3, 0, 0, - (SCM env, SCM sym, SCM val), - "If @var{env} binds @var{sym} to some location, change that\n" - "location's value to @var{val}. The return value is\n" - "unspecified.\n" - "If @var{sym} is not bound in @var{env}, signal an\n" - "@code{environment:unbound} error. If @var{env} binds @var{sym}\n" - "to an immutable location, signal an\n" - "@code{environment:immutable-location} error.") -#define FUNC_NAME s_scm_environment_set_x -{ - SCM status; - - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, FUNC_NAME); - - status = SCM_ENVIRONMENT_SET (env, sym, val); - - if (scm_is_eq (status, SCM_ENVIRONMENT_SUCCESS)) - return SCM_UNSPECIFIED; - else if (SCM_UNBNDP (status)) - scm_error_environment_unbound (FUNC_NAME, env, sym); - else if (scm_is_eq (status, SCM_ENVIRONMENT_LOCATION_IMMUTABLE)) - scm_error_environment_immutable_binding (FUNC_NAME, env, sym); - else - abort(); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_cell, "environment-cell", 3, 0, 0, - (SCM env, SCM sym, SCM for_write), - "Return the value cell which @var{env} binds to @var{sym}, or\n" - "@code{#f} if the binding does not live in a value cell.\n" - "The argument @var{for-write} indicates whether the caller\n" - "intends to modify the variable's value by mutating the value\n" - "cell. If the variable is immutable, then\n" - "@code{environment-cell} signals an\n" - "@code{environment:immutable-location} error.\n" - "If @var{sym} is unbound in @var{env}, signal an\n" - "@code{environment:unbound} error.\n" - "If you use this function, you should consider using\n" - "@code{environment-observe}, to be notified when @var{sym} gets\n" - "re-bound to a new value cell, or becomes undefined.") -#define FUNC_NAME s_scm_environment_cell -{ - SCM location; - - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, FUNC_NAME); - SCM_ASSERT (scm_is_bool (for_write), for_write, SCM_ARG3, FUNC_NAME); - - location = SCM_ENVIRONMENT_CELL (env, sym, scm_is_true (for_write)); - if (!SCM_IMP (location)) - return location; - else if (SCM_UNBNDP (location)) - scm_error_environment_unbound (FUNC_NAME, env, sym); - else if (scm_is_eq (location, SCM_ENVIRONMENT_LOCATION_IMMUTABLE)) - scm_error_environment_immutable_location (FUNC_NAME, env, sym); - else /* no cell */ - return location; -} -#undef FUNC_NAME - - -/* This C function is identical to environment-cell, with the following - * exceptions: If symbol is unbound in env, it returns the value - * SCM_UNDEFINED, instead of signalling an error. If symbol is bound to an - * immutable location but the cell is requested for write, the value - * SCM_ENVIRONMENT_LOCATION_IMMUTABLE is returned. - */ -SCM -scm_c_environment_cell(SCM env, SCM sym, int for_write) -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, "scm_c_environment_cell"); - SCM_ASSERT (scm_is_symbol (sym), sym, SCM_ARG2, "scm_c_environment_cell"); - - return SCM_ENVIRONMENT_CELL (env, sym, for_write); -} - - -static void -environment_default_observer (SCM env, SCM proc) -{ - scm_call_1 (proc, env); -} - - -SCM_DEFINE (scm_environment_observe, "environment-observe", 2, 0, 0, - (SCM env, SCM proc), - "Whenever @var{env}'s bindings change, apply @var{proc} to\n" - "@var{env}.\n" - "This function returns an object, token, which you can pass to\n" - "@code{environment-unobserve} to remove @var{proc} from the set\n" - "of procedures observing @var{env}. The type and value of\n" - "token is unspecified.") -#define FUNC_NAME s_scm_environment_observe -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return SCM_ENVIRONMENT_OBSERVE (env, environment_default_observer, proc, 0); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_observe_weak, "environment-observe-weak", 2, 0, 0, - (SCM env, SCM proc), - "This function is the same as environment-observe, except that\n" - "the reference @var{env} retains to @var{proc} is a weak\n" - "reference. This means that, if there are no other live,\n" - "non-weak references to @var{proc}, it will be\n" - "garbage-collected, and dropped from @var{env}'s\n" - "list of observing procedures.") -#define FUNC_NAME s_scm_environment_observe_weak -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return SCM_ENVIRONMENT_OBSERVE (env, environment_default_observer, proc, 1); -} -#undef FUNC_NAME - - -/* This is the C-level analog of the Scheme functions environment-observe and - * environment-observe-weak. Whenever env's bindings change, call the - * function proc, passing it env and data. If weak_p is non-zero, env will - * retain only a weak reference to data, and if data is garbage collected, the - * entire observation will be dropped. This function returns a token, with - * the same meaning as those returned by environment-observe and - * environment-observe-weak. - */ -SCM -scm_c_environment_observe (SCM env, scm_environment_observer proc, SCM data, int weak_p) -#define FUNC_NAME "scm_c_environment_observe" -{ - SCM_ASSERT (SCM_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return SCM_ENVIRONMENT_OBSERVE (env, proc, data, weak_p); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_environment_unobserve, "environment-unobserve", 1, 0, 0, - (SCM token), - "Cancel the observation request which returned the value\n" - "@var{token}. The return value is unspecified.\n" - "If a call @code{(environment-observe env proc)} returns\n" - "@var{token}, then the call @code{(environment-unobserve token)}\n" - "will cause @var{proc} to no longer be called when @var{env}'s\n" - "bindings change.") -#define FUNC_NAME s_scm_environment_unobserve -{ - SCM env; - - SCM_ASSERT (SCM_OBSERVER_P (token), token, SCM_ARG1, FUNC_NAME); - - env = SCM_OBSERVER_ENVIRONMENT (token); - SCM_ENVIRONMENT_UNOBSERVE (env, token); - - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - - -static int -environment_print (SCM env, SCM port, scm_print_state *pstate) -{ - return (*(SCM_ENVIRONMENT_FUNCS (env)->print)) (env, port, pstate); -} - - - -/* observers */ - - -static int -observer_print (SCM type, SCM port, scm_print_state *pstate SCM_UNUSED) -{ - SCM address = scm_from_size_t (SCM_UNPACK (type)); - SCM base16 = scm_number_to_string (address, scm_from_int (16)); - - scm_puts ("#", port); - - return 1; -} - - - -/* obarrays - * - * Obarrays form the basic lookup tables used to implement most of guile's - * built-in environment types. An obarray is implemented as a hash table with - * symbols as keys. The content of the data depends on the environment type. - */ - - -/* - * Enter symbol into obarray. The symbol must not already exist in obarray. - * The freshly generated (symbol . data) cell is returned. - */ -static SCM -obarray_enter (SCM obarray, SCM symbol, SCM data) -{ - size_t hash = scm_i_symbol_hash (symbol) % SCM_HASHTABLE_N_BUCKETS (obarray); - SCM entry = scm_cons (symbol, data); - SCM slot = scm_cons (entry, SCM_HASHTABLE_BUCKET (obarray, hash)); - SCM_SET_HASHTABLE_BUCKET (obarray, hash, slot); - SCM_HASHTABLE_INCREMENT (obarray); - if (SCM_HASHTABLE_N_ITEMS (obarray) > SCM_HASHTABLE_UPPER (obarray)) - scm_i_rehash (obarray, scm_i_hash_symbol, 0, "obarray_enter"); - - return entry; -} - - -/* - * Enter symbol into obarray. An existing entry for symbol is replaced. If - * an entry existed, the old (symbol . data) cell is returned, #f otherwise. - */ -static SCM -obarray_replace (SCM obarray, SCM symbol, SCM data) -{ - size_t hash = scm_i_symbol_hash (symbol) % SCM_HASHTABLE_N_BUCKETS (obarray); - SCM new_entry = scm_cons (symbol, data); - SCM lsym; - SCM slot; - - for (lsym = SCM_HASHTABLE_BUCKET (obarray, hash); - !scm_is_null (lsym); - lsym = SCM_CDR (lsym)) - { - SCM old_entry = SCM_CAR (lsym); - if (scm_is_eq (SCM_CAR (old_entry), symbol)) - { - SCM_SETCAR (lsym, new_entry); - return old_entry; - } - } - - slot = scm_cons (new_entry, SCM_HASHTABLE_BUCKET (obarray, hash)); - SCM_SET_HASHTABLE_BUCKET (obarray, hash, slot); - SCM_HASHTABLE_INCREMENT (obarray); - if (SCM_HASHTABLE_N_ITEMS (obarray) > SCM_HASHTABLE_UPPER (obarray)) - scm_i_rehash (obarray, scm_i_hash_symbol, 0, "obarray_replace"); - - return SCM_BOOL_F; -} - - -/* - * Look up symbol in obarray - */ -static SCM -obarray_retrieve (SCM obarray, SCM sym) -{ - size_t hash = scm_i_symbol_hash (sym) % SCM_HASHTABLE_N_BUCKETS (obarray); - SCM lsym; - - for (lsym = SCM_HASHTABLE_BUCKET (obarray, hash); - !scm_is_null (lsym); - lsym = SCM_CDR (lsym)) - { - SCM entry = SCM_CAR (lsym); - if (scm_is_eq (SCM_CAR (entry), sym)) - return entry; - } - - return SCM_UNDEFINED; -} - - -/* - * Remove entry from obarray. If the symbol was found and removed, the old - * (symbol . data) cell is returned, #f otherwise. - */ -static SCM -obarray_remove (SCM obarray, SCM sym) -{ - size_t hash = scm_i_symbol_hash (sym) % SCM_HASHTABLE_N_BUCKETS (obarray); - SCM table_entry = SCM_HASHTABLE_BUCKET (obarray, hash); - SCM handle = scm_sloppy_assq (sym, table_entry); - - if (scm_is_pair (handle)) - { - SCM new_table_entry = scm_delq1_x (handle, table_entry); - SCM_SET_HASHTABLE_BUCKET (obarray, hash, new_table_entry); - SCM_HASHTABLE_DECREMENT (obarray); - } - - return handle; -} - - -static void -obarray_remove_all (SCM obarray) -{ - size_t size = SCM_HASHTABLE_N_BUCKETS (obarray); - size_t i; - - for (i = 0; i < size; i++) - { - SCM_SET_HASHTABLE_BUCKET (obarray, i, SCM_EOL); - } - SCM_SET_HASHTABLE_N_ITEMS (obarray, 0); -} - - - -/* core environments base - * - * This struct and the corresponding functions form a base class for guile's - * built-in environment types. - */ - - -struct core_environments_base { - struct scm_environment_funcs *funcs; - - SCM observers; - SCM weak_observers; -}; - - -#define CORE_ENVIRONMENTS_BASE(env) \ - ((struct core_environments_base *) SCM_CELL_WORD_1 (env)) -#define CORE_ENVIRONMENT_OBSERVERS(env) \ - (CORE_ENVIRONMENTS_BASE (env)->observers) -#define SCM_SET_CORE_ENVIRONMENT_OBSERVERS(env, v) \ - (CORE_ENVIRONMENT_OBSERVERS (env) = (v)) -#define CORE_ENVIRONMENT_WEAK_OBSERVER_VECTOR(env) \ - (CORE_ENVIRONMENTS_BASE (env)->weak_observers) -#define CORE_ENVIRONMENT_WEAK_OBSERVERS(env) \ - (scm_c_vector_ref (CORE_ENVIRONMENT_WEAK_OBSERVER_VECTOR (env), 0)) -#define SCM_SET_CORE_ENVIRONMENT_WEAK_OBSERVERS(env, v) \ - (scm_c_vector_set_x (CORE_ENVIRONMENT_WEAK_OBSERVER_VECTOR (env), 0, (v))) - - - -static SCM -core_environments_observe (SCM env, scm_environment_observer proc, SCM data, int weak_p) -{ - SCM observer; - - SCM_NEWSMOB3 (observer, scm_tc16_observer, - SCM_UNPACK (env), - SCM_UNPACK (data), - (scm_t_bits) proc); - - if (!weak_p) - { - SCM observers = CORE_ENVIRONMENT_OBSERVERS (env); - SCM new_observers = scm_cons (observer, observers); - SCM_SET_CORE_ENVIRONMENT_OBSERVERS (env, new_observers); - } - else - { - SCM observers = CORE_ENVIRONMENT_WEAK_OBSERVERS (env); - SCM new_observers = scm_acons (SCM_BOOL_F, observer, observers); - SCM_SET_CORE_ENVIRONMENT_WEAK_OBSERVERS (env, new_observers); - } - - return observer; -} - - -static void -core_environments_unobserve (SCM env, SCM observer) -{ - unsigned int handling_weaks; - for (handling_weaks = 0; handling_weaks <= 1; ++handling_weaks) - { - SCM l = handling_weaks - ? CORE_ENVIRONMENT_WEAK_OBSERVERS (env) - : CORE_ENVIRONMENT_OBSERVERS (env); - - if (!scm_is_null (l)) - { - SCM rest = SCM_CDR (l); - SCM first = handling_weaks - ? SCM_CDAR (l) - : SCM_CAR (l); - - if (scm_is_eq (first, observer)) - { - /* Remove the first observer */ - if (handling_weaks) - SCM_SET_CORE_ENVIRONMENT_WEAK_OBSERVERS (env, rest); - else - SCM_SET_CORE_ENVIRONMENT_OBSERVERS (env, rest); - return; - } - - do { - SCM rest = SCM_CDR (l); - - if (!scm_is_null (rest)) - { - SCM next = handling_weaks - ? SCM_CDAR (l) - : SCM_CAR (l); - - if (scm_is_eq (next, observer)) - { - SCM_SETCDR (l, SCM_CDR (rest)); - return; - } - } - - l = rest; - } while (!scm_is_null (l)); - } - } - - /* Dirk:FIXME:: What to do now, since the observer is not found? */ -} - - -static void -core_environments_preinit (struct core_environments_base *body) -{ - body->funcs = NULL; - body->observers = SCM_BOOL_F; - body->weak_observers = SCM_BOOL_F; -} - - -static void -core_environments_init (struct core_environments_base *body, - struct scm_environment_funcs *funcs) -{ - body->funcs = funcs; - body->observers = SCM_EOL; - body->weak_observers = scm_make_weak_value_alist_vector (scm_from_int (1)); -} - - -/* Tell all observers to clear their caches. - * - * Environments have to be informed about changes in the following cases: - * - The observed env has a new binding. This must be always reported. - * - The observed env has dropped a binding. This must be always reported. - * - A binding in the observed environment has changed. This must only be - * reported, if there is a chance that the binding is being cached outside. - * However, this potential optimization is not performed currently. - * - * Errors that occur while the observers are called are accumulated and - * signalled as one single error message to the caller. - */ - -struct update_data -{ - SCM observer; - SCM environment; -}; - - -static SCM -update_catch_body (void *ptr) -{ - struct update_data *data = (struct update_data *) ptr; - SCM observer = data->observer; - - (*SCM_OBSERVER_PROC (observer)) - (data->environment, SCM_OBSERVER_DATA (observer)); - - return SCM_UNDEFINED; -} - - -static SCM -update_catch_handler (void *ptr, SCM tag, SCM args) -{ - struct update_data *data = (struct update_data *) ptr; - SCM observer = data->observer; - SCM message = - scm_from_locale_string ("Observer `~A' signals `~A' error: ~S"); - - return scm_cons (message, scm_list_3 (observer, tag, args)); -} - - -static void -core_environments_broadcast (SCM env) -#define FUNC_NAME "core_environments_broadcast" -{ - unsigned int handling_weaks; - SCM errors = SCM_EOL; - - for (handling_weaks = 0; handling_weaks <= 1; ++handling_weaks) - { - SCM observers = handling_weaks - ? CORE_ENVIRONMENT_WEAK_OBSERVERS (env) - : CORE_ENVIRONMENT_OBSERVERS (env); - - for (; !scm_is_null (observers); observers = SCM_CDR (observers)) - { - struct update_data data; - SCM observer = handling_weaks - ? SCM_CDAR (observers) - : SCM_CAR (observers); - SCM error; - - data.observer = observer; - data.environment = env; - - error = scm_internal_catch (SCM_BOOL_T, - update_catch_body, &data, - update_catch_handler, &data); - - if (!SCM_UNBNDP (error)) - errors = scm_cons (error, errors); - } - } - - if (!scm_is_null (errors)) - { - /* Dirk:FIXME:: As soon as scm_misc_error is fixed to handle the name - * parameter correctly it should not be necessary any more to also pass - * namestr in order to get the desired information from the error - * message. - */ - SCM ordered_errors = scm_reverse (errors); - scm_misc_error - (FUNC_NAME, - "Observers of `~A' have signalled the following errors: ~S", - scm_cons2 (env, ordered_errors, SCM_EOL)); - } -} -#undef FUNC_NAME - - - -/* leaf environments - * - * A leaf environment is simply a mutable set of definitions. A leaf - * environment supports no operations beyond the common set. - * - * Implementation: The obarray of the leaf environment holds (symbol . value) - * pairs. No further information is necessary, since all bindings and - * locations in a leaf environment are mutable. - */ - - -struct leaf_environment { - struct core_environments_base base; - - SCM obarray; -}; - - -#define LEAF_ENVIRONMENT(env) \ - ((struct leaf_environment *) SCM_CELL_WORD_1 (env)) - - - -static SCM -leaf_environment_ref (SCM env, SCM sym) -{ - SCM obarray = LEAF_ENVIRONMENT (env)->obarray; - SCM binding = obarray_retrieve (obarray, sym); - return SCM_UNBNDP (binding) ? binding : SCM_CDR (binding); -} - - -static SCM -leaf_environment_fold (SCM env, scm_environment_folder proc, SCM data, SCM init) -{ - size_t i; - SCM result = init; - SCM obarray = LEAF_ENVIRONMENT (env)->obarray; - - for (i = 0; i < SCM_HASHTABLE_N_BUCKETS (obarray); i++) - { - SCM l; - for (l = SCM_HASHTABLE_BUCKET (obarray, i); - !scm_is_null (l); - l = SCM_CDR (l)) - { - SCM binding = SCM_CAR (l); - SCM symbol = SCM_CAR (binding); - SCM value = SCM_CDR (binding); - result = (*proc) (data, symbol, value, result); - } - } - return result; -} - - -static SCM -leaf_environment_define (SCM env, SCM sym, SCM val) -#define FUNC_NAME "leaf_environment_define" -{ - SCM obarray = LEAF_ENVIRONMENT (env)->obarray; - - obarray_replace (obarray, sym, val); - core_environments_broadcast (env); - - return SCM_ENVIRONMENT_SUCCESS; -} -#undef FUNC_NAME - - -static SCM -leaf_environment_undefine (SCM env, SCM sym) -#define FUNC_NAME "leaf_environment_undefine" -{ - SCM obarray = LEAF_ENVIRONMENT (env)->obarray; - SCM removed = obarray_remove (obarray, sym); - - if (scm_is_true (removed)) - core_environments_broadcast (env); - - return SCM_ENVIRONMENT_SUCCESS; -} -#undef FUNC_NAME - - -static SCM -leaf_environment_set_x (SCM env, SCM sym, SCM val) -#define FUNC_NAME "leaf_environment_set_x" -{ - SCM obarray = LEAF_ENVIRONMENT (env)->obarray; - SCM binding = obarray_retrieve (obarray, sym); - - if (!SCM_UNBNDP (binding)) - { - SCM_SETCDR (binding, val); - return SCM_ENVIRONMENT_SUCCESS; - } - else - { - return SCM_UNDEFINED; - } -} -#undef FUNC_NAME - - -static SCM -leaf_environment_cell (SCM env, SCM sym, int for_write SCM_UNUSED) -{ - SCM obarray = LEAF_ENVIRONMENT (env)->obarray; - SCM binding = obarray_retrieve (obarray, sym); - return binding; -} - - - -static int -leaf_environment_print (SCM type, SCM port, scm_print_state *pstate SCM_UNUSED) -{ - SCM address = scm_from_size_t (SCM_UNPACK (type)); - SCM base16 = scm_number_to_string (address, scm_from_int (16)); - - scm_puts ("#", port); - - return 1; -} - - -static struct scm_environment_funcs leaf_environment_funcs = { - leaf_environment_ref, - leaf_environment_fold, - leaf_environment_define, - leaf_environment_undefine, - leaf_environment_set_x, - leaf_environment_cell, - core_environments_observe, - core_environments_unobserve, - leaf_environment_print -}; - - -void *scm_type_leaf_environment = &leaf_environment_funcs; - - -SCM_DEFINE (scm_make_leaf_environment, "make-leaf-environment", 0, 0, 0, - (), - "Create a new leaf environment, containing no bindings.\n" - "All bindings and locations created in the new environment\n" - "will be mutable.") -#define FUNC_NAME s_scm_make_leaf_environment -{ - size_t size = sizeof (struct leaf_environment); - struct leaf_environment *body = scm_gc_malloc (size, "leaf environment"); - SCM env; - - core_environments_preinit (&body->base); - body->obarray = SCM_BOOL_F; - - env = scm_make_environment (body); - - core_environments_init (&body->base, &leaf_environment_funcs); - body->obarray = scm_c_make_hash_table (DEFAULT_OBARRAY_SIZE); - - return env; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_leaf_environment_p, "leaf-environment?", 1, 0, 0, - (SCM object), - "Return @code{#t} if object is a leaf environment, or @code{#f}\n" - "otherwise.") -#define FUNC_NAME s_scm_leaf_environment_p -{ - return scm_from_bool (SCM_LEAF_ENVIRONMENT_P (object)); -} -#undef FUNC_NAME - - - -/* eval environments - * - * A module's source code refers to definitions imported from other modules, - * and definitions made within itself. An eval environment combines two - * environments -- a local environment and an imported environment -- to - * produce a new environment in which both sorts of references can be - * resolved. - * - * Implementation: The obarray of the eval environment is used to cache - * entries from the local and imported environments such that in most of the - * cases only a single lookup is necessary. Since for neither the local nor - * the imported environment it is known, what kind of environment they form, - * the most general case is assumed. Therefore, entries in the obarray take - * one of the following forms: - * - * 1) ( location mutability . source-env), where mutability indicates - * one of the following states: IMMUTABLE if the location is known to be - * immutable, MUTABLE if the location is known to be mutable, UNKNOWN if - * the location has only been requested for non modifying accesses. - * - * 2) (symbol . source-env) if the symbol has a binding in the source-env, but - * if the source-env can't provide a cell for the binding. Thus, for every - * access, the source-env has to be contacted directly. - */ - - -struct eval_environment { - struct core_environments_base base; - - SCM obarray; - - SCM imported; - SCM imported_observer; - SCM local; - SCM local_observer; -}; - - -#define EVAL_ENVIRONMENT(env) \ - ((struct eval_environment *) SCM_CELL_WORD_1 (env)) - -#define IMMUTABLE SCM_I_MAKINUM (0) -#define MUTABLE SCM_I_MAKINUM (1) -#define UNKNOWN SCM_I_MAKINUM (2) - -#define CACHED_LOCATION(x) SCM_CAR (x) -#define CACHED_MUTABILITY(x) SCM_CADR (x) -#define SET_CACHED_MUTABILITY(x, v) SCM_SETCAR (SCM_CDR (x), (v)) -#define CACHED_SOURCE_ENVIRONMENT(x) SCM_CDDR (x) - - - -/* eval_environment_lookup will report one of the following distinct results: - * a) ( . value) if a cell could be obtained. - * b) if the environment has to be contacted directly. - * c) IMMUTABLE if an immutable cell was requested for write. - * d) SCM_UNDEFINED if there is no binding for the symbol. - */ -static SCM -eval_environment_lookup (SCM env, SCM sym, int for_write) -{ - SCM obarray = EVAL_ENVIRONMENT (env)->obarray; - SCM binding = obarray_retrieve (obarray, sym); - - if (!SCM_UNBNDP (binding)) - { - /* The obarray holds an entry for the symbol. */ - - SCM entry = SCM_CDR (binding); - - if (scm_is_pair (entry)) - { - /* The entry in the obarray is a cached location. */ - - SCM location = CACHED_LOCATION (entry); - SCM mutability; - - if (!for_write) - return location; - - mutability = CACHED_MUTABILITY (entry); - if (scm_is_eq (mutability, MUTABLE)) - return location; - - if (scm_is_eq (mutability, UNKNOWN)) - { - SCM source_env = CACHED_SOURCE_ENVIRONMENT (entry); - SCM location = SCM_ENVIRONMENT_CELL (source_env, sym, 1); - - if (scm_is_pair (location)) - { - SET_CACHED_MUTABILITY (entry, MUTABLE); - return location; - } - else /* IMMUTABLE */ - { - SET_CACHED_MUTABILITY (entry, IMMUTABLE); - return IMMUTABLE; - } - } - - return IMMUTABLE; - } - else - { - /* The obarray entry is an environment */ - - return entry; - } - } - else - { - /* There is no entry for the symbol in the obarray. This can either - * mean that there has not been a request for the symbol yet, or that - * the symbol is really undefined. We are looking for the symbol in - * both the local and the imported environment. If we find a binding, a - * cached entry is created. - */ - - struct eval_environment *body = EVAL_ENVIRONMENT (env); - unsigned int handling_import; - - for (handling_import = 0; handling_import <= 1; ++handling_import) - { - SCM source_env = handling_import ? body->imported : body->local; - SCM location = SCM_ENVIRONMENT_CELL (source_env, sym, for_write); - - if (!SCM_UNBNDP (location)) - { - if (scm_is_pair (location)) - { - SCM mutability = for_write ? MUTABLE : UNKNOWN; - SCM entry = scm_cons2 (location, mutability, source_env); - obarray_enter (obarray, sym, entry); - return location; - } - else if (scm_is_eq (location, SCM_ENVIRONMENT_LOCATION_NO_CELL)) - { - obarray_enter (obarray, sym, source_env); - return source_env; - } - else - { - return IMMUTABLE; - } - } - } - - return SCM_UNDEFINED; - } -} - - -static SCM -eval_environment_ref (SCM env, SCM sym) -#define FUNC_NAME "eval_environment_ref" -{ - SCM location = eval_environment_lookup (env, sym, 0); - - if (scm_is_pair (location)) - return SCM_CDR (location); - else if (!SCM_UNBNDP (location)) - return SCM_ENVIRONMENT_REF (location, sym); - else - return SCM_UNDEFINED; -} -#undef FUNC_NAME - - -static SCM -eval_environment_folder (SCM extended_data, SCM symbol, SCM value, SCM tail) -{ - SCM local = SCM_CAR (extended_data); - - if (!SCM_ENVIRONMENT_BOUND_P (local, symbol)) - { - SCM proc_as_nr = SCM_CADR (extended_data); - unsigned long int proc_as_ul = scm_to_ulong (proc_as_nr); - scm_environment_folder proc = (scm_environment_folder) proc_as_ul; - SCM data = SCM_CDDR (extended_data); - - return (*proc) (data, symbol, value, tail); - } - else - { - return tail; - } -} - - -static SCM -eval_environment_fold (SCM env, scm_environment_folder proc, SCM data, SCM init) -{ - SCM local = EVAL_ENVIRONMENT (env)->local; - SCM imported = EVAL_ENVIRONMENT (env)->imported; - SCM proc_as_nr = scm_from_ulong ((unsigned long) proc); - SCM extended_data = scm_cons2 (local, proc_as_nr, data); - SCM tmp_result = scm_c_environment_fold (imported, eval_environment_folder, extended_data, init); - - return scm_c_environment_fold (local, proc, data, tmp_result); -} - - -static SCM -eval_environment_define (SCM env, SCM sym, SCM val) -#define FUNC_NAME "eval_environment_define" -{ - SCM local = EVAL_ENVIRONMENT (env)->local; - return SCM_ENVIRONMENT_DEFINE (local, sym, val); -} -#undef FUNC_NAME - - -static SCM -eval_environment_undefine (SCM env, SCM sym) -#define FUNC_NAME "eval_environment_undefine" -{ - SCM local = EVAL_ENVIRONMENT (env)->local; - return SCM_ENVIRONMENT_UNDEFINE (local, sym); -} -#undef FUNC_NAME - - -static SCM -eval_environment_set_x (SCM env, SCM sym, SCM val) -#define FUNC_NAME "eval_environment_set_x" -{ - SCM location = eval_environment_lookup (env, sym, 1); - - if (scm_is_pair (location)) - { - SCM_SETCDR (location, val); - return SCM_ENVIRONMENT_SUCCESS; - } - else if (SCM_ENVIRONMENT_P (location)) - { - return SCM_ENVIRONMENT_SET (location, sym, val); - } - else if (scm_is_eq (location, IMMUTABLE)) - { - return SCM_ENVIRONMENT_LOCATION_IMMUTABLE; - } - else - { - return SCM_UNDEFINED; - } -} -#undef FUNC_NAME - - -static SCM -eval_environment_cell (SCM env, SCM sym, int for_write) -#define FUNC_NAME "eval_environment_cell" -{ - SCM location = eval_environment_lookup (env, sym, for_write); - - if (scm_is_pair (location)) - return location; - else if (SCM_ENVIRONMENT_P (location)) - return SCM_ENVIRONMENT_LOCATION_NO_CELL; - else if (scm_is_eq (location, IMMUTABLE)) - return SCM_ENVIRONMENT_LOCATION_IMMUTABLE; - else - return SCM_UNDEFINED; -} -#undef FUNC_NAME - - - -static int -eval_environment_print (SCM type, SCM port, scm_print_state *pstate SCM_UNUSED) -{ - SCM address = scm_from_size_t (SCM_UNPACK (type)); - SCM base16 = scm_number_to_string (address, scm_from_int (16)); - - scm_puts ("#", port); - - return 1; -} - - -static struct scm_environment_funcs eval_environment_funcs = { - eval_environment_ref, - eval_environment_fold, - eval_environment_define, - eval_environment_undefine, - eval_environment_set_x, - eval_environment_cell, - core_environments_observe, - core_environments_unobserve, - eval_environment_print -}; - - -void *scm_type_eval_environment = &eval_environment_funcs; - - -static void -eval_environment_observer (SCM caller SCM_UNUSED, SCM eval_env) -{ - SCM obarray = EVAL_ENVIRONMENT (eval_env)->obarray; - - obarray_remove_all (obarray); - core_environments_broadcast (eval_env); -} - - -SCM_DEFINE (scm_make_eval_environment, "make-eval-environment", 2, 0, 0, - (SCM local, SCM imported), - "Return a new environment object eval whose bindings are the\n" - "union of the bindings in the environments @var{local} and\n" - "@var{imported}, with bindings from @var{local} taking\n" - "precedence. Definitions made in eval are placed in @var{local}.\n" - "Applying @code{environment-define} or\n" - "@code{environment-undefine} to eval has the same effect as\n" - "applying the procedure to @var{local}.\n" - "Note that eval incorporates @var{local} and @var{imported} by\n" - "reference:\n" - "If, after creating eval, the program changes the bindings of\n" - "@var{local} or @var{imported}, those changes will be visible\n" - "in eval.\n" - "Since most Scheme evaluation takes place in eval environments,\n" - "they transparently cache the bindings received from @var{local}\n" - "and @var{imported}. Thus, the first time the program looks up\n" - "a symbol in eval, eval may make calls to @var{local} or\n" - "@var{imported} to find their bindings, but subsequent\n" - "references to that symbol will be as fast as references to\n" - "bindings in finite environments.\n" - "In typical use, @var{local} will be a finite environment, and\n" - "@var{imported} will be an import environment") -#define FUNC_NAME s_scm_make_eval_environment -{ - SCM env; - struct eval_environment *body; - - SCM_ASSERT (SCM_ENVIRONMENT_P (local), local, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (SCM_ENVIRONMENT_P (imported), imported, SCM_ARG2, FUNC_NAME); - - body = scm_gc_malloc (sizeof (struct eval_environment), "eval environment"); - - core_environments_preinit (&body->base); - body->obarray = SCM_BOOL_F; - body->imported = SCM_BOOL_F; - body->imported_observer = SCM_BOOL_F; - body->local = SCM_BOOL_F; - body->local_observer = SCM_BOOL_F; - - env = scm_make_environment (body); - - core_environments_init (&body->base, &eval_environment_funcs); - body->obarray = scm_c_make_hash_table (DEFAULT_OBARRAY_SIZE); - body->imported = imported; - body->imported_observer - = SCM_ENVIRONMENT_OBSERVE (imported, eval_environment_observer, env, 1); - body->local = local; - body->local_observer - = SCM_ENVIRONMENT_OBSERVE (local, eval_environment_observer, env, 1); - - return env; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_eval_environment_p, "eval-environment?", 1, 0, 0, - (SCM object), - "Return @code{#t} if object is an eval environment, or @code{#f}\n" - "otherwise.") -#define FUNC_NAME s_scm_eval_environment_p -{ - return scm_from_bool (SCM_EVAL_ENVIRONMENT_P (object)); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_eval_environment_local, "eval-environment-local", 1, 0, 0, - (SCM env), - "Return the local environment of eval environment @var{env}.") -#define FUNC_NAME s_scm_eval_environment_local -{ - SCM_ASSERT (SCM_EVAL_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return EVAL_ENVIRONMENT (env)->local; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_eval_environment_set_local_x, "eval-environment-set-local!", 2, 0, 0, - (SCM env, SCM local), - "Change @var{env}'s local environment to @var{local}.") -#define FUNC_NAME s_scm_eval_environment_set_local_x -{ - struct eval_environment *body; - - SCM_ASSERT (SCM_EVAL_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (SCM_ENVIRONMENT_P (local), local, SCM_ARG2, FUNC_NAME); - - body = EVAL_ENVIRONMENT (env); - - obarray_remove_all (body->obarray); - SCM_ENVIRONMENT_UNOBSERVE (body->local, body->local_observer); - - body->local = local; - body->local_observer - = SCM_ENVIRONMENT_OBSERVE (local, eval_environment_observer, env, 1); - - core_environments_broadcast (env); - - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_eval_environment_imported, "eval-environment-imported", 1, 0, 0, - (SCM env), - "Return the imported environment of eval environment @var{env}.") -#define FUNC_NAME s_scm_eval_environment_imported -{ - SCM_ASSERT (SCM_EVAL_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return EVAL_ENVIRONMENT (env)->imported; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_eval_environment_set_imported_x, "eval-environment-set-imported!", 2, 0, 0, - (SCM env, SCM imported), - "Change @var{env}'s imported environment to @var{imported}.") -#define FUNC_NAME s_scm_eval_environment_set_imported_x -{ - struct eval_environment *body; - - SCM_ASSERT (SCM_EVAL_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (SCM_ENVIRONMENT_P (imported), imported, SCM_ARG2, FUNC_NAME); - - body = EVAL_ENVIRONMENT (env); - - obarray_remove_all (body->obarray); - SCM_ENVIRONMENT_UNOBSERVE (body->imported, body->imported_observer); - - body->imported = imported; - body->imported_observer - = SCM_ENVIRONMENT_OBSERVE (imported, eval_environment_observer, env, 1); - - core_environments_broadcast (env); - - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - - -/* import environments - * - * An import environment combines the bindings of a set of argument - * environments, and checks for naming clashes. - * - * Implementation: The import environment does no caching at all. For every - * access, the list of imported environments is scanned. - */ - - -struct import_environment { - struct core_environments_base base; - - SCM imports; - SCM import_observers; - - SCM conflict_proc; -}; - - -#define IMPORT_ENVIRONMENT(env) \ - ((struct import_environment *) SCM_CELL_WORD_1 (env)) - - - -/* Lookup will report one of the following distinct results: - * a) if only environment binds the symbol. - * b) (env-1 env-2 ...) for conflicting bindings in env-1, ... - * c) SCM_UNDEFINED if there is no binding for the symbol. - */ -static SCM -import_environment_lookup (SCM env, SCM sym) -{ - SCM imports = IMPORT_ENVIRONMENT (env)->imports; - SCM result = SCM_UNDEFINED; - SCM l; - - for (l = imports; !scm_is_null (l); l = SCM_CDR (l)) - { - SCM imported = SCM_CAR (l); - - if (SCM_ENVIRONMENT_BOUND_P (imported, sym)) - { - if (SCM_UNBNDP (result)) - result = imported; - else if (scm_is_pair (result)) - result = scm_cons (imported, result); - else - result = scm_cons2 (imported, result, SCM_EOL); - } - } - - if (scm_is_pair (result)) - return scm_reverse (result); - else - return result; -} - - -static SCM -import_environment_conflict (SCM env, SCM sym, SCM imports) -{ - SCM conflict_proc = IMPORT_ENVIRONMENT (env)->conflict_proc; - SCM args = scm_cons2 (env, sym, scm_cons (imports, SCM_EOL)); - - return scm_apply_0 (conflict_proc, args); -} - - -static SCM -import_environment_ref (SCM env, SCM sym) -#define FUNC_NAME "import_environment_ref" -{ - SCM owner = import_environment_lookup (env, sym); - - if (SCM_UNBNDP (owner)) - { - return SCM_UNDEFINED; - } - else if (scm_is_pair (owner)) - { - SCM resolve = import_environment_conflict (env, sym, owner); - - if (SCM_ENVIRONMENT_P (resolve)) - return SCM_ENVIRONMENT_REF (resolve, sym); - else - return SCM_UNSPECIFIED; - } - else - { - return SCM_ENVIRONMENT_REF (owner, sym); - } -} -#undef FUNC_NAME - - -static SCM -import_environment_folder (SCM extended_data, SCM symbol, SCM value, SCM tail) -#define FUNC_NAME "import_environment_fold" -{ - SCM import_env = SCM_CAR (extended_data); - SCM imported_env = SCM_CADR (extended_data); - SCM owner = import_environment_lookup (import_env, symbol); - SCM proc_as_nr = SCM_CADDR (extended_data); - unsigned long int proc_as_ul = scm_to_ulong (proc_as_nr); - scm_environment_folder proc = (scm_environment_folder) proc_as_ul; - SCM data = SCM_CDDDR (extended_data); - - if (scm_is_pair (owner) && scm_is_eq (SCM_CAR (owner), imported_env)) - owner = import_environment_conflict (import_env, symbol, owner); - - if (SCM_ENVIRONMENT_P (owner)) - return (*proc) (data, symbol, value, tail); - else /* unresolved conflict */ - return (*proc) (data, symbol, SCM_UNSPECIFIED, tail); -} -#undef FUNC_NAME - - -static SCM -import_environment_fold (SCM env, scm_environment_folder proc, SCM data, SCM init) -{ - SCM proc_as_nr = scm_from_ulong ((unsigned long) proc); - SCM result = init; - SCM l; - - for (l = IMPORT_ENVIRONMENT (env)->imports; !scm_is_null (l); l = SCM_CDR (l)) - { - SCM imported_env = SCM_CAR (l); - SCM extended_data = scm_cons (env, scm_cons2 (imported_env, proc_as_nr, data)); - - result = scm_c_environment_fold (imported_env, import_environment_folder, extended_data, result); - } - - return result; -} - - -static SCM -import_environment_define (SCM env SCM_UNUSED, - SCM sym SCM_UNUSED, - SCM val SCM_UNUSED) -#define FUNC_NAME "import_environment_define" -{ - return SCM_ENVIRONMENT_BINDING_IMMUTABLE; -} -#undef FUNC_NAME - - -static SCM -import_environment_undefine (SCM env SCM_UNUSED, - SCM sym SCM_UNUSED) -#define FUNC_NAME "import_environment_undefine" -{ - return SCM_ENVIRONMENT_BINDING_IMMUTABLE; -} -#undef FUNC_NAME - - -static SCM -import_environment_set_x (SCM env, SCM sym, SCM val) -#define FUNC_NAME "import_environment_set_x" -{ - SCM owner = import_environment_lookup (env, sym); - - if (SCM_UNBNDP (owner)) - { - return SCM_UNDEFINED; - } - else if (scm_is_pair (owner)) - { - SCM resolve = import_environment_conflict (env, sym, owner); - - if (SCM_ENVIRONMENT_P (resolve)) - return SCM_ENVIRONMENT_SET (resolve, sym, val); - else - return SCM_ENVIRONMENT_LOCATION_IMMUTABLE; - } - else - { - return SCM_ENVIRONMENT_SET (owner, sym, val); - } -} -#undef FUNC_NAME - - -static SCM -import_environment_cell (SCM env, SCM sym, int for_write) -#define FUNC_NAME "import_environment_cell" -{ - SCM owner = import_environment_lookup (env, sym); - - if (SCM_UNBNDP (owner)) - { - return SCM_UNDEFINED; - } - else if (scm_is_pair (owner)) - { - SCM resolve = import_environment_conflict (env, sym, owner); - - if (SCM_ENVIRONMENT_P (resolve)) - return SCM_ENVIRONMENT_CELL (resolve, sym, for_write); - else - return SCM_ENVIRONMENT_LOCATION_NO_CELL; - } - else - { - return SCM_ENVIRONMENT_CELL (owner, sym, for_write); - } -} -#undef FUNC_NAME - - - -static int -import_environment_print (SCM type, SCM port, - scm_print_state *pstate SCM_UNUSED) -{ - SCM address = scm_from_size_t (SCM_UNPACK (type)); - SCM base16 = scm_number_to_string (address, scm_from_int (16)); - - scm_puts ("#", port); - - return 1; -} - - -static struct scm_environment_funcs import_environment_funcs = { - import_environment_ref, - import_environment_fold, - import_environment_define, - import_environment_undefine, - import_environment_set_x, - import_environment_cell, - core_environments_observe, - core_environments_unobserve, - import_environment_print -}; - - -void *scm_type_import_environment = &import_environment_funcs; - - -static void -import_environment_observer (SCM caller SCM_UNUSED, SCM import_env) -{ - core_environments_broadcast (import_env); -} - - -SCM_DEFINE (scm_make_import_environment, "make-import-environment", 2, 0, 0, - (SCM imports, SCM conflict_proc), - "Return a new environment @var{imp} whose bindings are the union\n" - "of the bindings from the environments in @var{imports};\n" - "@var{imports} must be a list of environments. That is,\n" - "@var{imp} binds a symbol to a location when some element of\n" - "@var{imports} does.\n" - "If two different elements of @var{imports} have a binding for\n" - "the same symbol, the @var{conflict-proc} is called with the\n" - "following parameters: the import environment, the symbol and\n" - "the list of the imported environments that bind the symbol.\n" - "If the @var{conflict-proc} returns an environment @var{env},\n" - "the conflict is considered as resolved and the binding from\n" - "@var{env} is used. If the @var{conflict-proc} returns some\n" - "non-environment object, the conflict is considered unresolved\n" - "and the symbol is treated as unspecified in the import\n" - "environment.\n" - "The checking for conflicts may be performed lazily, i. e. at\n" - "the moment when a value or binding for a certain symbol is\n" - "requested instead of the moment when the environment is\n" - "created or the bindings of the imports change.\n" - "All bindings in @var{imp} are immutable. If you apply\n" - "@code{environment-define} or @code{environment-undefine} to\n" - "@var{imp}, Guile will signal an\n" - " @code{environment:immutable-binding} error. However,\n" - "notice that the set of bindings in @var{imp} may still change,\n" - "if one of its imported environments changes.") -#define FUNC_NAME s_scm_make_import_environment -{ - size_t size = sizeof (struct import_environment); - struct import_environment *body = scm_gc_malloc (size, "import environment"); - SCM env; - - core_environments_preinit (&body->base); - body->imports = SCM_BOOL_F; - body->import_observers = SCM_BOOL_F; - body->conflict_proc = SCM_BOOL_F; - - env = scm_make_environment (body); - - core_environments_init (&body->base, &import_environment_funcs); - body->imports = SCM_EOL; - body->import_observers = SCM_EOL; - body->conflict_proc = conflict_proc; - - scm_import_environment_set_imports_x (env, imports); - - return env; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_import_environment_p, "import-environment?", 1, 0, 0, - (SCM object), - "Return @code{#t} if object is an import environment, or\n" - "@code{#f} otherwise.") -#define FUNC_NAME s_scm_import_environment_p -{ - return scm_from_bool (SCM_IMPORT_ENVIRONMENT_P (object)); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_import_environment_imports, "import-environment-imports", 1, 0, 0, - (SCM env), - "Return the list of environments imported by the import\n" - "environment @var{env}.") -#define FUNC_NAME s_scm_import_environment_imports -{ - SCM_ASSERT (SCM_IMPORT_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return IMPORT_ENVIRONMENT (env)->imports; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_import_environment_set_imports_x, "import-environment-set-imports!", 2, 0, 0, - (SCM env, SCM imports), - "Change @var{env}'s list of imported environments to\n" - "@var{imports}, and check for conflicts.") -#define FUNC_NAME s_scm_import_environment_set_imports_x -{ - struct import_environment *body = IMPORT_ENVIRONMENT (env); - SCM import_observers = SCM_EOL; - SCM l; - - SCM_ASSERT (SCM_IMPORT_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - for (l = imports; scm_is_pair (l); l = SCM_CDR (l)) - { - SCM obj = SCM_CAR (l); - SCM_ASSERT (SCM_ENVIRONMENT_P (obj), imports, SCM_ARG2, FUNC_NAME); - } - SCM_ASSERT (scm_is_null (l), imports, SCM_ARG2, FUNC_NAME); - - for (l = body->import_observers; !scm_is_null (l); l = SCM_CDR (l)) - { - SCM obs = SCM_CAR (l); - SCM_ENVIRONMENT_UNOBSERVE (env, obs); - } - - for (l = imports; !scm_is_null (l); l = SCM_CDR (l)) - { - SCM imp = SCM_CAR (l); - SCM obs = SCM_ENVIRONMENT_OBSERVE (imp, import_environment_observer, env, 1); - import_observers = scm_cons (obs, import_observers); - } - - body->imports = imports; - body->import_observers = import_observers; - - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - - -/* export environments - * - * An export environment restricts an environment to a specified set of - * bindings. - * - * Implementation: The export environment does no caching at all. For every - * access, the signature is scanned. The signature that is stored internally - * is an alist of pairs (symbol . (mutability)). - */ - - -struct export_environment { - struct core_environments_base base; - - SCM private; - SCM private_observer; - - SCM signature; -}; - - -#define EXPORT_ENVIRONMENT(env) \ - ((struct export_environment *) SCM_CELL_WORD_1 (env)) - - -SCM_SYMBOL (symbol_immutable_location, "immutable-location"); -SCM_SYMBOL (symbol_mutable_location, "mutable-location"); - - - -static SCM -export_environment_ref (SCM env, SCM sym) -#define FUNC_NAME "export_environment_ref" -{ - struct export_environment *body = EXPORT_ENVIRONMENT (env); - SCM entry = scm_assq (sym, body->signature); - - if (scm_is_false (entry)) - return SCM_UNDEFINED; - else - return SCM_ENVIRONMENT_REF (body->private, sym); -} -#undef FUNC_NAME - - -static SCM -export_environment_fold (SCM env, scm_environment_folder proc, SCM data, SCM init) -{ - struct export_environment *body = EXPORT_ENVIRONMENT (env); - SCM result = init; - SCM l; - - for (l = body->signature; !scm_is_null (l); l = SCM_CDR (l)) - { - SCM symbol = SCM_CAR (l); - SCM value = SCM_ENVIRONMENT_REF (body->private, symbol); - if (!SCM_UNBNDP (value)) - result = (*proc) (data, symbol, value, result); - } - return result; -} - - -static SCM -export_environment_define (SCM env SCM_UNUSED, - SCM sym SCM_UNUSED, - SCM val SCM_UNUSED) -#define FUNC_NAME "export_environment_define" -{ - return SCM_ENVIRONMENT_BINDING_IMMUTABLE; -} -#undef FUNC_NAME - - -static SCM -export_environment_undefine (SCM env SCM_UNUSED, SCM sym SCM_UNUSED) -#define FUNC_NAME "export_environment_undefine" -{ - return SCM_ENVIRONMENT_BINDING_IMMUTABLE; -} -#undef FUNC_NAME - - -static SCM -export_environment_set_x (SCM env, SCM sym, SCM val) -#define FUNC_NAME "export_environment_set_x" -{ - struct export_environment *body = EXPORT_ENVIRONMENT (env); - SCM entry = scm_assq (sym, body->signature); - - if (scm_is_false (entry)) - { - return SCM_UNDEFINED; - } - else - { - if (scm_is_eq (SCM_CADR (entry), symbol_mutable_location)) - return SCM_ENVIRONMENT_SET (body->private, sym, val); - else - return SCM_ENVIRONMENT_LOCATION_IMMUTABLE; - } -} -#undef FUNC_NAME - - -static SCM -export_environment_cell (SCM env, SCM sym, int for_write) -#define FUNC_NAME "export_environment_cell" -{ - struct export_environment *body = EXPORT_ENVIRONMENT (env); - SCM entry = scm_assq (sym, body->signature); - - if (scm_is_false (entry)) - { - return SCM_UNDEFINED; - } - else - { - if (!for_write || scm_is_eq (SCM_CADR (entry), symbol_mutable_location)) - return SCM_ENVIRONMENT_CELL (body->private, sym, for_write); - else - return SCM_ENVIRONMENT_LOCATION_IMMUTABLE; - } -} -#undef FUNC_NAME - - - -static int -export_environment_print (SCM type, SCM port, - scm_print_state *pstate SCM_UNUSED) -{ - SCM address = scm_from_size_t (SCM_UNPACK (type)); - SCM base16 = scm_number_to_string (address, scm_from_int (16)); - - scm_puts ("#", port); - - return 1; -} - - -static struct scm_environment_funcs export_environment_funcs = { - export_environment_ref, - export_environment_fold, - export_environment_define, - export_environment_undefine, - export_environment_set_x, - export_environment_cell, - core_environments_observe, - core_environments_unobserve, - export_environment_print -}; - - -void *scm_type_export_environment = &export_environment_funcs; - - -static void -export_environment_observer (SCM caller SCM_UNUSED, SCM export_env) -{ - core_environments_broadcast (export_env); -} - - -SCM_DEFINE (scm_make_export_environment, "make-export-environment", 2, 0, 0, - (SCM private, SCM signature), - "Return a new environment @var{exp} containing only those\n" - "bindings in private whose symbols are present in\n" - "@var{signature}. The @var{private} argument must be an\n" - "environment.\n\n" - "The environment @var{exp} binds symbol to location when\n" - "@var{env} does, and symbol is exported by @var{signature}.\n\n" - "@var{signature} is a list specifying which of the bindings in\n" - "@var{private} should be visible in @var{exp}. Each element of\n" - "@var{signature} should be a list of the form:\n" - " (symbol attribute ...)\n" - "where each attribute is one of the following:\n" - "@table @asis\n" - "@item the symbol @code{mutable-location}\n" - " @var{exp} should treat the\n" - " location bound to symbol as mutable. That is, @var{exp}\n" - " will pass calls to @code{environment-set!} or\n" - " @code{environment-cell} directly through to private.\n" - "@item the symbol @code{immutable-location}\n" - " @var{exp} should treat\n" - " the location bound to symbol as immutable. If the program\n" - " applies @code{environment-set!} to @var{exp} and symbol, or\n" - " calls @code{environment-cell} to obtain a writable value\n" - " cell, @code{environment-set!} will signal an\n" - " @code{environment:immutable-location} error. Note that, even\n" - " if an export environment treats a location as immutable, the\n" - " underlying environment may treat it as mutable, so its\n" - " value may change.\n" - "@end table\n" - "It is an error for an element of signature to specify both\n" - "@code{mutable-location} and @code{immutable-location}. If\n" - "neither is specified, @code{immutable-location} is assumed.\n\n" - "As a special case, if an element of signature is a lone\n" - "symbol @var{sym}, it is equivalent to an element of the form\n" - "@code{(sym)}.\n\n" - "All bindings in @var{exp} are immutable. If you apply\n" - "@code{environment-define} or @code{environment-undefine} to\n" - "@var{exp}, Guile will signal an\n" - "@code{environment:immutable-binding} error. However,\n" - "notice that the set of bindings in @var{exp} may still change,\n" - "if the bindings in private change.") -#define FUNC_NAME s_scm_make_export_environment -{ - size_t size; - struct export_environment *body; - SCM env; - - SCM_ASSERT (SCM_ENVIRONMENT_P (private), private, SCM_ARG1, FUNC_NAME); - - size = sizeof (struct export_environment); - body = scm_gc_malloc (size, "export environment"); - - core_environments_preinit (&body->base); - body->private = SCM_BOOL_F; - body->private_observer = SCM_BOOL_F; - body->signature = SCM_BOOL_F; - - env = scm_make_environment (body); - - core_environments_init (&body->base, &export_environment_funcs); - body->private = private; - body->private_observer - = SCM_ENVIRONMENT_OBSERVE (private, export_environment_observer, env, 1); - body->signature = SCM_EOL; - - scm_export_environment_set_signature_x (env, signature); - - return env; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_export_environment_p, "export-environment?", 1, 0, 0, - (SCM object), - "Return @code{#t} if object is an export environment, or\n" - "@code{#f} otherwise.") -#define FUNC_NAME s_scm_export_environment_p -{ - return scm_from_bool (SCM_EXPORT_ENVIRONMENT_P (object)); -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_export_environment_private, "export-environment-private", 1, 0, 0, - (SCM env), - "Return the private environment of export environment @var{env}.") -#define FUNC_NAME s_scm_export_environment_private -{ - SCM_ASSERT (SCM_EXPORT_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return EXPORT_ENVIRONMENT (env)->private; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_export_environment_set_private_x, "export-environment-set-private!", 2, 0, 0, - (SCM env, SCM private), - "Change the private environment of export environment @var{env}.") -#define FUNC_NAME s_scm_export_environment_set_private_x -{ - struct export_environment *body; - - SCM_ASSERT (SCM_EXPORT_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - SCM_ASSERT (SCM_ENVIRONMENT_P (private), private, SCM_ARG2, FUNC_NAME); - - body = EXPORT_ENVIRONMENT (env); - SCM_ENVIRONMENT_UNOBSERVE (private, body->private_observer); - - body->private = private; - body->private_observer - = SCM_ENVIRONMENT_OBSERVE (private, export_environment_observer, env, 1); - - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - -SCM_DEFINE (scm_export_environment_signature, "export-environment-signature", 1, 0, 0, - (SCM env), - "Return the signature of export environment @var{env}.") -#define FUNC_NAME s_scm_export_environment_signature -{ - SCM_ASSERT (SCM_EXPORT_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - - return EXPORT_ENVIRONMENT (env)->signature; -} -#undef FUNC_NAME - - -static SCM -export_environment_parse_signature (SCM signature, const char* caller) -{ - SCM result = SCM_EOL; - SCM l; - - for (l = signature; scm_is_pair (l); l = SCM_CDR (l)) - { - SCM entry = SCM_CAR (l); - - if (scm_is_symbol (entry)) - { - SCM new_entry = scm_cons2 (entry, symbol_immutable_location, SCM_EOL); - result = scm_cons (new_entry, result); - } - else - { - SCM sym; - SCM new_entry; - int immutable = 0; - int mutable = 0; - SCM mutability; - SCM l2; - - SCM_ASSERT (scm_is_pair (entry), entry, SCM_ARGn, caller); - SCM_ASSERT (scm_is_symbol (SCM_CAR (entry)), entry, SCM_ARGn, caller); - - sym = SCM_CAR (entry); - - for (l2 = SCM_CDR (entry); scm_is_pair (l2); l2 = SCM_CDR (l2)) - { - SCM attribute = SCM_CAR (l2); - if (scm_is_eq (attribute, symbol_immutable_location)) - immutable = 1; - else if (scm_is_eq (attribute, symbol_mutable_location)) - mutable = 1; - else - SCM_ASSERT (0, entry, SCM_ARGn, caller); - } - SCM_ASSERT (scm_is_null (l2), entry, SCM_ARGn, caller); - SCM_ASSERT (!mutable || !immutable, entry, SCM_ARGn, caller); - - if (!mutable && !immutable) - immutable = 1; - - mutability = mutable ? symbol_mutable_location : symbol_immutable_location; - new_entry = scm_cons2 (sym, mutability, SCM_EOL); - result = scm_cons (new_entry, result); - } - } - SCM_ASSERT (scm_is_null (l), signature, SCM_ARGn, caller); - - /* Dirk:FIXME:: Now we know that signature is syntactically correct. There - * are, however, no checks for symbols entered twice with contradicting - * mutabilities. It would be nice, to implement this test, to be able to - * call the sort functions conveniently from C. - */ - - return scm_reverse (result); -} - - -SCM_DEFINE (scm_export_environment_set_signature_x, "export-environment-set-signature!", 2, 0, 0, - (SCM env, SCM signature), - "Change the signature of export environment @var{env}.") -#define FUNC_NAME s_scm_export_environment_set_signature_x -{ - SCM parsed_sig; - - SCM_ASSERT (SCM_EXPORT_ENVIRONMENT_P (env), env, SCM_ARG1, FUNC_NAME); - parsed_sig = export_environment_parse_signature (signature, FUNC_NAME); - - EXPORT_ENVIRONMENT (env)->signature = parsed_sig; - - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - - -void -scm_environments_prehistory () -{ - /* create environment smob */ - scm_tc16_environment = scm_make_smob_type ("environment", 0); - scm_set_smob_print (scm_tc16_environment, environment_print); - - /* create observer smob */ - scm_tc16_observer = scm_make_smob_type ("observer", 0); - scm_set_smob_print (scm_tc16_observer, observer_print); - - /* create system environment */ - scm_system_environment = scm_make_leaf_environment (); - scm_permanent_object (scm_system_environment); -} - - -void -scm_init_environments () -{ -#include "libguile/environments.x" -} - - -/* - Local Variables: - c-file-style: "gnu" - End: -*/ diff --git a/libguile/environments.h b/libguile/environments.h deleted file mode 100644 index 143963254..000000000 --- a/libguile/environments.h +++ /dev/null @@ -1,187 +0,0 @@ -/* classes: h_files */ - -#ifndef SCM_ENVIRONMENTS_H -#define SCM_ENVIRONMENTS_H - -/* Copyright (C) 1999,2000, 2006, 2008 Free Software Foundation, Inc. - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public License - * as published by the Free Software Foundation; either version 3 of - * the License, or (at your option) any later version. - * - * This library 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301 USA - */ - - - -#include "libguile/__scm.h" - - - -/* The type for folding functions written in C. A function meant to be passed - * to scm_c_environment_fold should have the type scm_environment_folder. - */ -typedef SCM (*scm_environment_folder) (SCM data, SCM sym, SCM val, SCM tail); - - -/* The type for observer functions written in C. A function meant to be - * passed to scm_c_environment_observe should have the type - * scm_environment_observer. - */ -typedef void (*scm_environment_observer) (SCM env, SCM data); - - -struct scm_environment_funcs { - SCM (*ref) (SCM self, SCM symbol); - SCM (*fold) (SCM self, scm_environment_folder proc, SCM data, SCM init); - - SCM (*define) (SCM self, SCM symbol, SCM value); - SCM (*undefine) (SCM self, SCM symbol); - SCM (*set) (SCM self, SCM symbol, SCM value); - - SCM (*cell) (SCM self, SCM symbol, int for_write); - SCM (*observe) (SCM self, scm_environment_observer proc, SCM data, int weak_p); - void (*unobserve) (SCM self, SCM token); - - int (*print) (SCM self, SCM port, scm_print_state *pstate); -}; - - - -#define SCM_ENVIRONMENT_SUCCESS SCM_BOOL_T -#define SCM_ENVIRONMENT_BINDING_IMMUTABLE scm_from_int (0) -#define SCM_ENVIRONMENT_LOCATION_IMMUTABLE scm_from_int (1) -#define SCM_ENVIRONMENT_LOCATION_NO_CELL SCM_BOOL_F - -SCM_API scm_t_bits scm_tc16_environment; - -#define SCM_ENVIRONMENT_P(x) \ - (!SCM_IMP (x) && SCM_CELL_TYPE (x) == scm_tc16_environment) -#define SCM_ENVIRONMENT_FUNCS(env) \ - (*((struct scm_environment_funcs **) SCM_CELL_WORD_1 (env))) -#define SCM_ENVIRONMENT_BOUND_P(env, symbol) \ - (!SCM_UNBNDP (SCM_ENVIRONMENT_REF (env, symbol))) -#define SCM_ENVIRONMENT_REF(env, symbol) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->ref)) (env, symbol)) -#define SCM_ENVIRONMENT_FOLD(env, proc, data, init) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->fold)) (env, proc, data, init)) -#define SCM_ENVIRONMENT_DEFINE(env, symbol, value) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->define)) (env, symbol, value)) -#define SCM_ENVIRONMENT_UNDEFINE(env, symbol) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->undefine)) (env, symbol)) -#define SCM_ENVIRONMENT_SET(env, symbol, value) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->set)) (env, symbol, value)) -#define SCM_ENVIRONMENT_CELL(env, symbol, for_write) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->cell)) (env, symbol, for_write)) -#define SCM_ENVIRONMENT_OBSERVE(env, proc, data, weak_p) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->observe)) (env, proc, data, weak_p)) -#define SCM_ENVIRONMENT_UNOBSERVE(env, token) \ - ((*(SCM_ENVIRONMENT_FUNCS (env)->unobserve)) (env, token)) - -SCM_API scm_t_bits scm_tc16_observer; - -#define SCM_OBSERVER_P(x) \ - (!SCM_IMP (x) && (SCM_CELL_TYPE (x) == scm_tc16_observer)) -#define SCM_OBSERVER_ENVIRONMENT(x) \ - (SCM_CELL_OBJECT_1 (x)) -#define SCM_OBSERVER_DATA(x) \ - (SCM_CELL_OBJECT_2 (x)) -#define SCM_OBSERVER_PROC(x) \ - ((scm_environment_observer) SCM_CELL_WORD_3 (x)) - -SCM_API SCM scm_system_environment; - -SCM_API void scm_error_environment_unbound (const char *, SCM, SCM) SCM_NORETURN; -SCM_API void scm_error_environment_immutable_binding (const char *, SCM, SCM) SCM_NORETURN; -SCM_API void scm_error_environment_immutable_location (const char *, SCM, SCM) SCM_NORETURN; - -SCM_API SCM scm_make_environment (void *type); -SCM_API SCM scm_environment_p (SCM env); -SCM_API SCM scm_environment_bound_p (SCM env, SCM sym); -SCM_API SCM scm_environment_ref (SCM env, SCM sym); -SCM_API SCM scm_c_environment_ref (SCM env, SCM sym); -SCM_API SCM scm_environment_fold (SCM env, SCM proc, SCM init); -SCM_API SCM scm_c_environment_fold (SCM env, scm_environment_folder proc, SCM data, SCM init); -SCM_API SCM scm_environment_define (SCM env, SCM sym, SCM val); -SCM_API SCM scm_environment_undefine (SCM env, SCM sym); -SCM_API SCM scm_environment_set_x (SCM env, SCM sym, SCM val); -SCM_API SCM scm_environment_cell (SCM env, SCM sym, SCM for_write); -SCM_API SCM scm_c_environment_cell (SCM env, SCM sym, int for_write); -SCM_API SCM scm_environment_observe (SCM env, SCM proc); -SCM_API SCM scm_environment_observe_weak (SCM env, SCM proc); -SCM_API SCM scm_c_environment_observe (SCM env, scm_environment_observer proc, SCM data, int weak_p); -SCM_API SCM scm_environment_unobserve (SCM token); - -SCM_INTERNAL void scm_environments_prehistory (void); -SCM_INTERNAL void scm_init_environments (void); - - - -SCM_API void *scm_type_leaf_environment; - -#define SCM_LEAF_ENVIRONMENT_P(env) \ - (SCM_ENVIRONMENT_P (env) \ - && SCM_ENVIRONMENT_FUNCS (env) == scm_type_leaf_environment) - -SCM_API SCM scm_make_leaf_environment (void); -SCM_API SCM scm_leaf_environment_p (SCM env); - - - -SCM_API void *scm_type_eval_environment; - -#define SCM_EVAL_ENVIRONMENT_P(env) \ - (SCM_ENVIRONMENT_P (env) \ - && SCM_ENVIRONMENT_FUNCS (env) == scm_type_eval_environment) - -SCM_API SCM scm_make_eval_environment (SCM local, SCM imported); -SCM_API SCM scm_eval_environment_p (SCM env); -SCM_API SCM scm_eval_environment_local (SCM env); -SCM_API SCM scm_eval_environment_set_local_x (SCM env, SCM local); -SCM_API SCM scm_eval_environment_imported (SCM env); -SCM_API SCM scm_eval_environment_set_imported_x (SCM env, SCM imported); - - - -SCM_API void *scm_type_import_environment; - -#define SCM_IMPORT_ENVIRONMENT_P(env) \ - (SCM_ENVIRONMENT_P (env) \ - && SCM_ENVIRONMENT_FUNCS (env) == scm_type_import_environment) - -SCM_API SCM scm_make_import_environment (SCM imports, SCM conflict_proc); -SCM_API SCM scm_import_environment_p (SCM env); -SCM_API SCM scm_import_environment_imports (SCM env); -SCM_API SCM scm_import_environment_set_imports_x (SCM env, SCM imports); - - - -SCM_API void *scm_type_export_environment; - -#define SCM_EXPORT_ENVIRONMENT_P(env) \ - (SCM_ENVIRONMENT_P (env) \ - && SCM_ENVIRONMENT_FUNCS (env) == scm_type_export_environment) - -SCM_API SCM scm_make_export_environment (SCM private, SCM signature); -SCM_API SCM scm_export_environment_p (SCM env); -SCM_API SCM scm_export_environment_private (SCM env); -SCM_API SCM scm_export_environment_set_private_x (SCM env, SCM private); -SCM_API SCM scm_export_environment_signature (SCM env); -SCM_API SCM scm_export_environment_set_signature_x (SCM env, SCM signature); - -#endif /* SCM_ENVIRONMENTS_H */ - -/* - Local Variables: - c-file-style: "gnu" - End: -*/ diff --git a/test-suite/tests/environments.nottest b/test-suite/tests/environments.nottest deleted file mode 100644 index 90ef80f63..000000000 --- a/test-suite/tests/environments.nottest +++ /dev/null @@ -1,1051 +0,0 @@ -;;;; environments.test -*- scheme -*- -;;;; Copyright (C) 2000, 2001, 2006 Free Software Foundation, Inc. -;;;; -;;;; This library is free software; you can redistribute it and/or -;;;; modify it under the terms of the GNU Lesser General Public -;;;; License as published by the Free Software Foundation; either -;;;; version 3 of the License, or (at your option) any later version. -;;;; -;;;; This library 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 -;;;; Lesser General Public License for more details. -;;;; -;;;; You should have received a copy of the GNU Lesser General Public -;;;; License along with this library; if not, write to the Free Software -;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - -(use-modules (ice-9 documentation) - (test-suite lib)) - -;;; environments are currently commented out of libguile, so these -;;; tests must be commented out also. - NJ 2006-11-02. -(if #f (let () - -;;; -;;; miscellaneous -;;; - -(define exception:unbound-symbol - (cons 'misc-error "^Symbol .* not bound in environment")) - -(define (documented? object) - (not (not (object-documentation object)))) - -(define (folder sym val res) - (cons (cons sym val) res)) - -(define (make-observer-func) - (let* ((counter 0)) - (lambda args - (if (null? args) - counter - (set! counter (+ counter 1)))))) - -(define (make-erroneous-observer-func) - (let* ((func (make-observer-func))) - (lambda args - (if (null? args) - (func) - (begin - (func args) - (error)))))) - -;;; -;;; leaf-environments -;;; - -(with-test-prefix "leaf-environments" - - (with-test-prefix "leaf-environment?" - - (pass-if "documented?" - (documented? leaf-environment?)) - - (pass-if "non-environment-object" - (not (leaf-environment? #f)))) - - - (with-test-prefix "make-leaf-environment" - - (pass-if "documented?" - (documented? make-leaf-environment)) - - (pass-if "produces an environment" - (environment? (make-leaf-environment))) - - (pass-if "produces a leaf-environment" - (leaf-environment? (make-leaf-environment))) - - (pass-if "produces always a new environment" - (not (eq? (make-leaf-environment) (make-leaf-environment))))) - - - (with-test-prefix "bound, define, ref, set!, cell" - - (pass-if "symbols are unbound by default" - (let* ((env (make-leaf-environment))) - (and (not (environment-bound? env 'a)) - (not (environment-bound? env 'b)) - (not (environment-bound? env 'c))))) - - (pass-if "symbol is bound after define" - (let* ((env (make-leaf-environment))) - (environment-bound? env 'a) - (environment-define env 'a #t) - (environment-bound? env 'a))) - - (pass-if "ref a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-bound? env 'a) - (environment-bound? env 'b) - (environment-define env 'a #t) - (environment-define env 'b #f) - (and (environment-ref env 'a) - (not (environment-ref env 'b))))) - - (pass-if "set! a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (environment-define env 'b #f) - (environment-ref env 'a) - (environment-ref env 'b) - (environment-set! env 'a #f) - (environment-set! env 'b #t) - (and (not (environment-ref env 'a)) - (environment-ref env 'b)))) - - (pass-if "get a read-only cell" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (let* ((cell (environment-cell env 'a #f))) - (and (cdr cell) - (begin - (environment-set! env 'a #f) - (not (cdr cell))))))) - - (pass-if "a read-only cell gets rebound after define" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (let* ((cell (environment-cell env 'a #f))) - (environment-define env 'a #f) - (not (eq? (environment-cell env 'a #f) cell))))) - - (pass-if "get a writable cell" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (let* ((readable (environment-cell env 'a #f)) - (writable (environment-cell env 'a #t))) - (and (eq? readable writable) - (begin - (environment-set! env 'a #f) - (not (cdr writable))) - (begin - (set-cdr! writable #t) - (environment-ref env 'a)) - (begin - (set-cdr! (environment-cell env 'a #t) #f) - (not (cdr writable))))))) - - (pass-if "a writable cell gets rebound after define" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (let* ((cell (environment-cell env 'a #t))) - (environment-define env 'a #f) - (not (eq? (environment-cell env 'a #t) cell))))) - - (pass-if-exception "reference an unbound symbol" - exception:unbound-symbol - (environment-ref (make-leaf-environment) 'a)) - - (pass-if-exception "set! an unbound symbol" - exception:unbound-symbol - (environment-set! (make-leaf-environment) 'a #f)) - - (pass-if-exception "get a readable cell for an unbound symbol" - exception:unbound-symbol - (environment-cell (make-leaf-environment) 'a #f)) - - (pass-if-exception "get a writable cell for an unbound symbol" - exception:unbound-symbol - (environment-cell (make-leaf-environment) 'a #t))) - - - (with-test-prefix "undefine" - - (pass-if "undefine a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (environment-ref env 'a) - (environment-undefine env 'a) - (not (environment-bound? env 'a)))) - - (pass-if "undefine an already undefined symbol" - (environment-undefine (make-leaf-environment) 'a) - #t)) - - - (with-test-prefix "fold" - - (pass-if "empty environment" - (let* ((env (make-leaf-environment))) - (eq? 'success (environment-fold env folder 'success)))) - - (pass-if "one symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (equal? '((a . #t)) (environment-fold env folder '())))) - - (pass-if "two symbols" - (let* ((env (make-leaf-environment))) - (environment-define env 'a #t) - (environment-define env 'b #f) - (let ((folded (environment-fold env folder '()))) - (or (equal? folded '((a . #t) (b . #f))) - (equal? folded '((b . #f) (a . #t)))))))) - - - (with-test-prefix "observe" - - (pass-if "observe an environment" - (let* ((env (make-leaf-environment))) - (environment-observe env (make-observer-func)) - #t)) - - (pass-if "observe an environment twice" - (let* ((env (make-leaf-environment)) - (observer-1 (environment-observe env (make-observer-func))) - (observer-2 (environment-observe env (make-observer-func)))) - (not (eq? observer-1 observer-2)))) - - (pass-if "definition of an undefined symbol" - (let* ((env (make-leaf-environment)) - (func (make-observer-func))) - (environment-observe env func) - (environment-define env 'a 1) - (eqv? (func) 1))) - - (pass-if "definition of an already defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe env func) - (environment-define env 'a 1) - (eqv? (func) 1)))) - - (pass-if "set!ing of a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe env func) - (environment-set! env 'a 1) - (eqv? (func) 0)))) - - (pass-if "undefining a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe env func) - (environment-undefine env 'a) - (eqv? (func) 1)))) - - (pass-if "undefining an already undefined symbol" - (let* ((env (make-leaf-environment)) - (func (make-observer-func))) - (environment-observe env func) - (environment-undefine env 'a) - (eqv? (func) 0))) - - (pass-if "unobserve an active observer" - (let* ((env (make-leaf-environment)) - (func (make-observer-func)) - (observer (environment-observe env func))) - (environment-unobserve observer) - (environment-define env 'a 1) - (eqv? (func) 0))) - - (pass-if "unobserve an inactive observer" - (let* ((env (make-leaf-environment)) - (func (make-observer-func)) - (observer (environment-observe env func))) - (environment-unobserve observer) - (environment-unobserve observer) - #t))) - - - (with-test-prefix "observe-weak" - - (pass-if "observe an environment" - (let* ((env (make-leaf-environment))) - (environment-observe-weak env (make-observer-func)) - #t)) - - (pass-if "observe an environment twice" - (let* ((env (make-leaf-environment)) - (observer-1 (environment-observe-weak env (make-observer-func))) - (observer-2 (environment-observe-weak env (make-observer-func)))) - (not (eq? observer-1 observer-2)))) - - (pass-if "definition of an undefined symbol" - (let* ((env (make-leaf-environment)) - (func (make-observer-func))) - (environment-observe-weak env func) - (environment-define env 'a 1) - (eqv? (func) 1))) - - (pass-if "definition of an already defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe-weak env func) - (environment-define env 'a 1) - (eqv? (func) 1)))) - - (pass-if "set!ing of a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe-weak env func) - (environment-set! env 'a 1) - (eqv? (func) 0)))) - - (pass-if "undefining a defined symbol" - (let* ((env (make-leaf-environment))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe-weak env func) - (environment-undefine env 'a) - (eqv? (func) 1)))) - - (pass-if "undefining an already undefined symbol" - (let* ((env (make-leaf-environment)) - (func (make-observer-func))) - (environment-observe-weak env func) - (environment-undefine env 'a) - (eqv? (func) 0))) - - (pass-if "unobserve an active observer" - (let* ((env (make-leaf-environment)) - (func (make-observer-func)) - (observer (environment-observe-weak env func))) - (environment-unobserve observer) - (environment-define env 'a 1) - (eqv? (func) 0))) - - (pass-if "unobserve an inactive observer" - (let* ((env (make-leaf-environment)) - (func (make-observer-func)) - (observer (environment-observe-weak env func))) - (environment-unobserve observer) - (environment-unobserve observer) - #t)) - - (pass-if "weak observer gets collected" - (gc) - (let* ((env (make-leaf-environment)) - (func (make-observer-func))) - (environment-observe-weak env func) - (gc) - (environment-define env 'a 1) - (if (not (eqv? (func) 0)) - (throw 'unresolved) ; note: conservative scanning - #t)))) - - - (with-test-prefix "erroneous observers" - - (pass-if "update continues after error" - (let* ((env (make-leaf-environment)) - (func-1 (make-erroneous-observer-func)) - (func-2 (make-erroneous-observer-func))) - (environment-observe env func-1) - (environment-observe env func-2) - (catch #t - (lambda () - (environment-define env 'a 1) - #f) - (lambda args - (and (eq? (func-1) 1) - (eq? (func-2) 1)))))))) - - -;;; -;;; leaf-environment based eval-environments -;;; - -(with-test-prefix "leaf-environment based eval-environments" - - (with-test-prefix "eval-environment?" - - (pass-if "documented?" - (documented? eval-environment?)) - - (pass-if "non-environment-object" - (not (eval-environment? #f))) - - (pass-if "leaf-environment-object" - (not (eval-environment? (make-leaf-environment))))) - - - (with-test-prefix "make-eval-environment" - - (pass-if "documented?" - (documented? make-eval-environment)) - - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment))) - - (pass-if "produces an environment" - (environment? (make-eval-environment local imported))) - - (pass-if "produces an eval-environment" - (eval-environment? (make-eval-environment local imported))) - - (pass-if "produces always a new environment" - (not (eq? (make-eval-environment local imported) - (make-eval-environment local imported)))))) - - - (with-test-prefix "eval-environment-local" - - (pass-if "documented?" - (documented? eval-environment-local)) - - (pass-if "returns local" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (eq? (eval-environment-local env) local)))) - - - (with-test-prefix "eval-environment-imported" - - (pass-if "documented?" - (documented? eval-environment-imported)) - - (pass-if "returns imported" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (eq? (eval-environment-imported env) imported)))) - - - (with-test-prefix "bound, define, ref, set!, cell" - - (pass-if "symbols are unbound by default" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (and (not (environment-bound? env 'a)) - (not (environment-bound? env 'b)) - (not (environment-bound? env 'c))))) - - (with-test-prefix "symbols bound in imported" - - (pass-if "binding is visible" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-bound? env 'a) - (environment-define imported 'a #t) - (environment-bound? env 'a))) - - (pass-if "ref works" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-bound? env 'a) - (environment-define imported 'a #t) - (environment-ref env 'a))) - - (pass-if "set! works" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #f) - (environment-set! env 'a #t) - (environment-ref imported 'a))) - - (pass-if "cells are passed through" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #t) - (let* ((imported-cell (environment-cell imported 'a #f)) - (env-cell (environment-cell env 'a #f))) - (eq? env-cell imported-cell))))) - - (with-test-prefix "symbols bound in local" - - (pass-if "binding is visible" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-bound? env 'a) - (environment-define local 'a #t) - (environment-bound? env 'a))) - - (pass-if "ref works" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (environment-ref env 'a))) - - (pass-if "set! works" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #f) - (environment-set! env 'a #t) - (environment-ref local 'a))) - - (pass-if "cells are passed through" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (let* ((local-cell (environment-cell local 'a #f)) - (env-cell (environment-cell env 'a #f))) - (eq? env-cell local-cell))))) - - (with-test-prefix "symbols bound in local and imported" - - (pass-if "binding is visible" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-bound? env 'a) - (environment-define imported 'a #t) - (environment-define local 'a #f) - (environment-bound? env 'a))) - - (pass-if "ref works" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #f) - (environment-define local 'a #t) - (environment-ref env 'a))) - - (pass-if "set! changes local" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #f) - (environment-define local 'a #f) - (environment-set! env 'a #t) - (environment-ref local 'a))) - - (pass-if "set! does not touch imported" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #t) - (environment-define local 'a #t) - (environment-set! env 'a #f) - (environment-ref imported 'a))) - - (pass-if "cells from local are passed through" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (let* ((local-cell (environment-cell local 'a #f)) - (env-cell (environment-cell env 'a #f))) - (eq? env-cell local-cell))))) - - (with-test-prefix "defining symbols" - - (pass-if "symbols are bound in local after define" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a #t) - (environment-bound? local 'a))) - - (pass-if "cells in local get rebound after define" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a #f) - (let* ((old-cell (environment-cell local 'a #f))) - (environment-define env 'a #f) - (let* ((new-cell (environment-cell local 'a #f))) - (not (eq? new-cell old-cell)))))) - - (pass-if "cells in imported get shadowed after define" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #f) - (environment-define env 'a #t) - (environment-ref local 'a)))) - - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - - (pass-if-exception "reference an unbound symbol" - exception:unbound-symbol - (environment-ref env 'b)) - - (pass-if-exception "set! an unbound symbol" - exception:unbound-symbol - (environment-set! env 'b #f)) - - (pass-if-exception "get a readable cell for an unbound symbol" - exception:unbound-symbol - (environment-cell env 'b #f)) - - (pass-if-exception "get a writable cell for an unbound symbol" - exception:unbound-symbol - (environment-cell env 'b #t)))) - - (with-test-prefix "eval-environment-set-local!" - - (pass-if "documented?" - (documented? eval-environment-set-local!)) - - (pass-if "new binding becomes visible" - (let* ((old-local (make-leaf-environment)) - (new-local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment old-local imported))) - (environment-bound? env 'a) - (environment-define new-local 'a #t) - (eval-environment-set-local! env new-local) - (environment-bound? env 'a))) - - (pass-if "existing binding is replaced" - (let* ((old-local (make-leaf-environment)) - (new-local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment old-local imported))) - (environment-define old-local 'a #f) - (environment-ref env 'a) - (environment-define new-local 'a #t) - (eval-environment-set-local! env new-local) - (environment-ref env 'a))) - - (pass-if "undefined binding is removed" - (let* ((old-local (make-leaf-environment)) - (new-local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment old-local imported))) - (environment-define old-local 'a #f) - (environment-ref env 'a) - (eval-environment-set-local! env new-local) - (not (environment-bound? env 'a)))) - - (pass-if "binding in imported remains shadowed" - (let* ((old-local (make-leaf-environment)) - (new-local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment old-local imported))) - (environment-define imported 'a #f) - (environment-define old-local 'a #f) - (environment-ref env 'a) - (environment-define new-local 'a #t) - (eval-environment-set-local! env new-local) - (environment-ref env 'a))) - - (pass-if "binding in imported gets shadowed" - (let* ((old-local (make-leaf-environment)) - (new-local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment old-local imported))) - (environment-define imported 'a #f) - (environment-ref env 'a) - (environment-define new-local 'a #t) - (eval-environment-set-local! env new-local) - (environment-ref env 'a))) - - (pass-if "binding in imported becomes visible" - (let* ((old-local (make-leaf-environment)) - (new-local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment old-local imported))) - (environment-define imported 'a #t) - (environment-define old-local 'a #f) - (environment-ref env 'a) - (eval-environment-set-local! env new-local) - (environment-ref env 'a)))) - - (with-test-prefix "eval-environment-set-imported!" - - (pass-if "documented?" - (documented? eval-environment-set-imported!)) - - (pass-if "new binding becomes visible" - (let* ((local (make-leaf-environment)) - (old-imported (make-leaf-environment)) - (new-imported (make-leaf-environment)) - (env (make-eval-environment local old-imported))) - (environment-bound? env 'a) - (environment-define new-imported 'a #t) - (eval-environment-set-imported! env new-imported) - (environment-bound? env 'a))) - - (pass-if "existing binding is replaced" - (let* ((local (make-leaf-environment)) - (old-imported (make-leaf-environment)) - (new-imported (make-leaf-environment)) - (env (make-eval-environment local old-imported))) - (environment-define old-imported 'a #f) - (environment-ref env 'a) - (environment-define new-imported 'a #t) - (eval-environment-set-imported! env new-imported) - (environment-ref env 'a))) - - (pass-if "undefined binding is removed" - (let* ((local (make-leaf-environment)) - (old-imported (make-leaf-environment)) - (new-imported (make-leaf-environment)) - (env (make-eval-environment local old-imported))) - (environment-define old-imported 'a #f) - (environment-ref env 'a) - (eval-environment-set-imported! env new-imported) - (not (environment-bound? env 'a)))) - - (pass-if "binding in imported remains shadowed" - (let* ((local (make-leaf-environment)) - (old-imported (make-leaf-environment)) - (new-imported (make-leaf-environment)) - (env (make-eval-environment local old-imported))) - (environment-define local 'a #t) - (environment-define old-imported 'a #f) - (environment-ref env 'a) - (environment-define new-imported 'a #t) - (eval-environment-set-imported! env new-imported) - (environment-ref env 'a))) - - (pass-if "binding in imported gets shadowed" - (let* ((local (make-leaf-environment)) - (old-imported (make-leaf-environment)) - (new-imported (make-leaf-environment)) - (env (make-eval-environment local old-imported))) - (environment-define local 'a #t) - (environment-ref env 'a) - (environment-define new-imported 'a #f) - (eval-environment-set-imported! env new-imported) - (environment-ref env 'a)))) - - (with-test-prefix "undefine" - - (pass-if "undefine an already undefined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-undefine env 'a) - #t)) - - (pass-if "undefine removes a binding from local" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (environment-undefine env 'a) - (not (environment-bound? local 'a)))) - - (pass-if "undefine does not influence imported" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #t) - (environment-undefine env 'a) - (environment-bound? imported 'a))) - - (pass-if "undefine an imported symbol does not undefine it" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #t) - (environment-undefine env 'a) - (environment-bound? env 'a))) - - (pass-if "undefine unshadows an imported symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #t) - (environment-define local 'a #f) - (environment-undefine env 'a) - (environment-ref env 'a)))) - - (with-test-prefix "fold" - - (pass-if "empty environment" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (eq? 'success (environment-fold env folder 'success)))) - - (pass-if "one symbol in local" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (equal? '((a . #t)) (environment-fold env folder '())))) - - (pass-if "one symbol in imported" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define imported 'a #t) - (equal? '((a . #t)) (environment-fold env folder '())))) - - (pass-if "shadowed symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (environment-define imported 'a #f) - (equal? '((a . #t)) (environment-fold env folder '())))) - - (pass-if "one symbol each" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define local 'a #t) - (environment-define imported 'b #f) - (let ((folded (environment-fold env folder '()))) - (or (equal? folded '((a . #t) (b . #f))) - (equal? folded '((b . #f) (a . #t)))))))) - - - (with-test-prefix "observe" - - (pass-if "observe an environment" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-observe env (make-observer-func)) - #t)) - - (pass-if "observe an environment twice" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (observer-1 (environment-observe env (make-observer-func))) - (observer-2 (environment-observe env (make-observer-func)))) - (not (eq? observer-1 observer-2)))) - - (pass-if "definition of an undefined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func))) - (environment-observe env func) - (environment-define env 'a 1) - (eqv? (func) 1))) - - (pass-if "definition of an already defined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe env func) - (environment-define env 'a 1) - (eqv? (func) 1)))) - - (pass-if "set!ing of a defined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe env func) - (environment-set! env 'a 1) - (eqv? (func) 0)))) - - (pass-if "undefining a defined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe env func) - (environment-undefine env 'a) - (eqv? (func) 1)))) - - (pass-if "undefining an already undefined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func))) - (environment-observe env func) - (environment-undefine env 'a) - (eqv? (func) 0))) - - (pass-if "unobserve an active observer" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func)) - (observer (environment-observe env func))) - (environment-unobserve observer) - (environment-define env 'a 1) - (eqv? (func) 0))) - - (pass-if "unobserve an inactive observer" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func)) - (observer (environment-observe env func))) - (environment-unobserve observer) - (environment-unobserve observer) - #t))) - - - (with-test-prefix "observe-weak" - - (pass-if "observe an environment" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-observe-weak env (make-observer-func)) - #t)) - - (pass-if "observe an environment twice" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (observer-1 (environment-observe-weak env (make-observer-func))) - (observer-2 (environment-observe-weak env (make-observer-func)))) - (not (eq? observer-1 observer-2)))) - - (pass-if "definition of an undefined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func))) - (environment-observe-weak env func) - (environment-define env 'a 1) - (eqv? (func) 1))) - - (pass-if "definition of an already defined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe-weak env func) - (environment-define env 'a 1) - (eqv? (func) 1)))) - - (pass-if "set!ing of a defined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe-weak env func) - (environment-set! env 'a 1) - (eqv? (func) 0)))) - - (pass-if "undefining a defined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (environment-define env 'a 1) - (let* ((func (make-observer-func))) - (environment-observe-weak env func) - (environment-undefine env 'a) - (eqv? (func) 1)))) - - (pass-if "undefining an already undefined symbol" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func))) - (environment-observe-weak env func) - (environment-undefine env 'a) - (eqv? (func) 0))) - - (pass-if "unobserve an active observer" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func)) - (observer (environment-observe-weak env func))) - (environment-unobserve observer) - (environment-define env 'a 1) - (eqv? (func) 0))) - - (pass-if "unobserve an inactive observer" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func)) - (observer (environment-observe-weak env func))) - (environment-unobserve observer) - (environment-unobserve observer) - #t)) - - (pass-if "weak observer gets collected" - (gc) - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func (make-observer-func))) - (environment-observe-weak env func) - (gc) - (environment-define env 'a 1) - (if (not (eqv? (func) 0)) - (throw 'unresolved) ; note: conservative scanning - #t)))) - - - (with-test-prefix "erroneous observers" - - (pass-if "update continues after error" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported)) - (func-1 (make-erroneous-observer-func)) - (func-2 (make-erroneous-observer-func))) - (environment-observe env func-1) - (environment-observe env func-2) - (catch #t - (lambda () - (environment-define env 'a 1) - #f) - (lambda args - (and (eq? (func-1) 1) - (eq? (func-2) 1)))))))) - - -;;; -;;; leaf-environment based import-environments -;;; - -(with-test-prefix "leaf-environment based import-environments" - - (with-test-prefix "import-environment?" - - (pass-if "documented?" - (documented? import-environment?)) - - (pass-if "non-environment-object" - (not (import-environment? #f))) - - (pass-if "leaf-environment-object" - (not (import-environment? (make-leaf-environment)))) - - (pass-if "eval-environment-object" - (let* ((local (make-leaf-environment)) - (imported (make-leaf-environment)) - (env (make-eval-environment local imported))) - (not (import-environment? (make-leaf-environment)))))) - - - (with-test-prefix "make-import-environment" - - (pass-if "documented?" - (documented? make-import-environment)))) - -;;; End of commenting out. - NJ 2006-11-02. -))