picrin/extlib/benz/lib.c

325 lines
7.6 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
static void
setup_default_env(pic_state *pic, struct pic_env *env)
{
void pic_define_syntactic_keyword(pic_state *, struct pic_env *, pic_sym *, pic_sym *);
pic_define_syntactic_keyword(pic, env, pic->sDEFINE_LIBRARY, pic->uDEFINE_LIBRARY);
pic_define_syntactic_keyword(pic, env, pic->sIMPORT, pic->uIMPORT);
pic_define_syntactic_keyword(pic, env, pic->sEXPORT, pic->uEXPORT);
pic_define_syntactic_keyword(pic, env, pic->sCOND_EXPAND, pic->uCOND_EXPAND);
}
struct pic_lib *
pic_make_library(pic_state *pic, pic_value name)
{
struct pic_lib *lib;
struct pic_env *env;
struct pic_dict *exports;
if ((lib = pic_find_library(pic, name)) != NULL) {
pic_errorf(pic, "library name already in use: ~s", name);
}
env = pic_make_env(pic, NULL);
exports = pic_make_dict(pic);
setup_default_env(pic, env);
lib = (struct pic_lib *)pic_obj_alloc(pic, sizeof(struct pic_lib), PIC_TT_LIB);
lib->name = name;
lib->env = env;
lib->exports = exports;
/* register! */
pic->libs = pic_acons(pic, name, pic_obj_value(lib), pic->libs);
return lib;
}
struct pic_lib *
pic_find_library(pic_state *pic, pic_value spec)
{
pic_value v;
v = pic_assoc(pic, spec, pic->libs, NULL);
if (pic_false_p(v)) {
return NULL;
}
return pic_lib_ptr(pic_cdr(pic, v));
}
static void
import_table(pic_state *pic, pic_value spec, struct pic_dict *imports)
{
struct pic_lib *lib;
struct pic_dict *table;
pic_value val, tmp, prefix, it;
pic_sym *sym, *id, *tag, *nick;
xh_entry *iter;
table = pic_make_dict(pic);
if (pic_pair_p(spec) && pic_sym_p(pic_car(pic, spec))) {
tag = pic_sym_ptr(pic_car(pic, spec));
if (tag == pic->sONLY) {
import_table(pic, pic_cadr(pic, spec), table);
pic_for_each (val, pic_cddr(pic, spec), it) {
pic_dict_set(pic, imports, pic_sym_ptr(val), pic_dict_ref(pic, table, pic_sym_ptr(val)));
}
return;
}
if (tag == pic->sRENAME) {
import_table(pic, pic_cadr(pic, spec), imports);
pic_for_each (val, pic_cddr(pic, spec), it) {
tmp = pic_dict_ref(pic, imports, pic_sym_ptr(pic_car(pic, val)));
pic_dict_del(pic, imports, pic_sym_ptr(pic_car(pic, val)));
pic_dict_set(pic, imports, pic_sym_ptr(pic_cadr(pic, val)), tmp);
}
return;
}
if (tag == pic->sPREFIX) {
import_table(pic, pic_cadr(pic, spec), table);
prefix = pic_list_ref(pic, spec, 2);
pic_dict_for_each (sym, table, iter) {
id = pic_intern(pic, pic_format(pic, "~s~s", prefix, pic_obj_value(sym)));
pic_dict_set(pic, imports, id, pic_dict_ref(pic, table, sym));
}
return;
}
if (tag == pic->sEXCEPT) {
import_table(pic, pic_cadr(pic, spec), imports);
pic_for_each (val, pic_cddr(pic, spec), it) {
pic_dict_del(pic, imports, pic_sym_ptr(val));
}
return;
}
}
lib = pic_find_library(pic, spec);
if (! lib) {
pic_errorf(pic, "library not found: ~a", spec);
}
pic_dict_for_each (nick, lib->exports, iter) {
pic_sym *realname, *uid;
realname = pic_sym_ptr(pic_dict_ref(pic, lib->exports, nick));
if ((uid = pic_find_variable(pic, lib->env, pic_obj_value(realname))) == NULL) {
pic_errorf(pic, "attempted to export undefined variable '~s'", pic_obj_value(realname));
}
pic_dict_set(pic, imports, nick, pic_obj_value(uid));
}
}
static void
import(pic_state *pic, pic_value spec)
{
struct pic_dict *imports;
pic_sym *sym;
xh_entry *it;
imports = pic_make_dict(pic);
import_table(pic, spec, imports);
pic_dict_for_each (sym, imports, it) {
pic_put_variable(pic, pic->lib->env, pic_obj_value(sym), pic_sym_ptr(pic_dict_ref(pic, imports, sym)));
}
}
static void
export(pic_state *pic, pic_value spec)
{
pic_sym *sRENAME = pic_intern_cstr(pic, "rename");
pic_value a, b;
if (pic_sym_p(spec)) { /* (export a) */
a = b = spec;
} else { /* (export (rename a b)) */
if (! pic_list_p(spec))
goto fail;
if (! (pic_length(pic, spec) == 3))
goto fail;
if (! pic_eq_p(pic_car(pic, spec), pic_obj_value(sRENAME)))
goto fail;
if (! pic_sym_p(a = pic_list_ref(pic, spec, 1)))
goto fail;
if (! pic_sym_p(b = pic_list_ref(pic, spec, 2)))
goto fail;
}
#if DEBUG
printf("* exporting %s as %s\n", pic_symbol_name(pic, pic_sym_ptr(b)), pic_symbol_name(pic, pic_sym_ptr(a)));
#endif
pic_dict_set(pic, pic->lib->exports, pic_sym_ptr(b), a);
return;
fail:
pic_errorf(pic, "illegal export spec: ~s", spec);
}
void
pic_import(pic_state *pic, pic_value spec)
{
import(pic, spec);
}
void
pic_import_library(pic_state *pic, struct pic_lib *lib)
{
import(pic, lib->name);
}
void
pic_export(pic_state *pic, pic_sym *sym)
{
export(pic, pic_obj_value(sym));
}
static bool
condexpand(pic_state *pic, pic_value clause)
{
pic_sym *tag;
pic_value c, feature, it;
if (pic_eq_p(clause, pic_obj_value(pic->sELSE))) {
return true;
}
if (pic_sym_p(clause)) {
pic_for_each (feature, pic->features, it) {
if(pic_eq_p(feature, clause))
return true;
}
return false;
}
if (! (pic_pair_p(clause) && pic_sym_p(pic_car(pic, clause)))) {
pic_errorf(pic, "invalid 'cond-expand' clause ~s", clause);
} else {
tag = pic_sym_ptr(pic_car(pic, clause));
}
if (tag == pic->sLIBRARY) {
return pic_find_library(pic, pic_list_ref(pic, clause, 1)) != NULL;
}
if (tag == pic->sNOT) {
return ! condexpand(pic, pic_list_ref(pic, clause, 1));
}
if (tag == pic->sAND) {
pic_for_each (c, pic_cdr(pic, clause), it) {
if (! condexpand(pic, c))
return false;
}
return true;
}
if (tag == pic->sOR) {
pic_for_each (c, pic_cdr(pic, clause), it) {
if (condexpand(pic, c))
return true;
}
return false;
}
pic_errorf(pic, "unknown 'cond-expand' directive ~s", clause);
}
static pic_value
pic_lib_condexpand(pic_state *pic)
{
pic_value *clauses;
size_t argc, i;
pic_get_args(pic, "*", &argc, &clauses);
for (i = 0; i < argc; i++) {
if (condexpand(pic, pic_car(pic, clauses[i]))) {
return pic_cons(pic, pic_obj_value(pic->sBEGIN), pic_cdr(pic, clauses[i]));
}
}
return pic_undef_value();
}
static pic_value
pic_lib_import(pic_state *pic)
{
size_t argc, i;
pic_value *argv;
pic_get_args(pic, "*", &argc, &argv);
for (i = 0; i < argc; ++i) {
import(pic, argv[i]);
}
return pic_undef_value();
}
static pic_value
pic_lib_export(pic_state *pic)
{
size_t argc, i;
pic_value *argv;
pic_get_args(pic, "*", &argc, &argv);
for (i = 0; i < argc; ++i) {
export(pic, argv[i]);
}
return pic_undef_value();
}
static pic_value
pic_lib_define_library(pic_state *pic)
{
struct pic_lib *lib, *prev = pic->lib;
size_t argc, i;
pic_value spec, *argv;
pic_get_args(pic, "o*", &spec, &argc, &argv);
if ((lib = pic_find_library(pic, spec)) == NULL) {
lib = pic_make_library(pic, spec);
}
pic_try {
pic->lib = lib;
for (i = 0; i < argc; ++i) {
pic_void(pic_eval(pic, argv[i], pic->lib->env));
}
pic->lib = prev;
}
pic_catch {
pic->lib = prev; /* restores pic->lib even if an error occured */
pic_raise(pic, pic->err);
}
return pic_undef_value();
}
void
pic_init_lib(pic_state *pic)
{
void pic_defmacro(pic_state *, pic_sym *, pic_sym *, pic_func_t);
pic_defmacro(pic, pic->sCOND_EXPAND, pic->uCOND_EXPAND, pic_lib_condexpand);
pic_defmacro(pic, pic->sIMPORT, pic->uIMPORT, pic_lib_import);
pic_defmacro(pic, pic->sEXPORT, pic->uEXPORT, pic_lib_export);
pic_defmacro(pic, pic->sDEFINE_LIBRARY, pic->uDEFINE_LIBRARY, pic_lib_define_library);
}