555 lines
12 KiB
C
555 lines
12 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include "picrin.h"
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static bool
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pic_var_p(pic_value obj)
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{
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return pic_sym_p(obj) || pic_id_p(obj);
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}
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struct pic_id *
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pic_make_id(pic_state *pic, pic_value var, struct pic_env *env)
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{
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struct pic_id *id;
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assert(pic_var_p(var));
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id = (struct pic_id *)pic_obj_alloc(pic, sizeof(struct pic_id), PIC_TT_ID);
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id->var = var;
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id->env = env;
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return id;
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}
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struct pic_env *
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pic_make_env(pic_state *pic, struct pic_env *up)
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{
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struct pic_env *env;
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env = (struct pic_env *)pic_obj_alloc(pic, sizeof(struct pic_env), PIC_TT_ENV);
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env->up = up;
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env->defer = pic_nil_value();
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xh_init_ptr(&env->map, sizeof(pic_sym *));
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return env;
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}
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pic_sym *
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pic_var_name(pic_state PIC_UNUSED(*pic), pic_value var)
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{
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assert(pic_var_p(var));
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while (pic_id_p(var)) {
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var = pic_id_ptr(var)->var;
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}
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return pic_sym_ptr(var);
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}
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pic_sym *
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pic_uniq(pic_state *pic, pic_value var)
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{
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pic_str *str;
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assert(pic_var_p(var));
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str = pic_format(pic, "%s.%d", pic_symbol_name(pic, pic_var_name(pic, var)), pic->ucnt++);
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return pic_intern(pic, str);
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}
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static pic_sym *
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lookup(pic_state PIC_UNUSED(*pic), pic_value var, struct pic_env *env)
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{
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xh_entry *e;
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assert(pic_var_p(var));
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while (env != NULL) {
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if ((e = xh_get_ptr(&env->map, pic_ptr(var))) != NULL) {
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return xh_val(e, pic_sym *);
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}
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env = env->up;
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}
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return NULL;
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}
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static pic_sym *
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resolve(pic_state *pic, pic_value var, struct pic_env *env)
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{
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pic_sym *uid;
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assert(pic_var_p(var));
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assert(env != NULL);
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while ((uid = lookup(pic, var, env)) == NULL) {
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if (pic_sym_p(var)) {
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break;
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}
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env = pic_id_ptr(var)->env;
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var = pic_id_ptr(var)->var;
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}
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if (uid == NULL) {
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while (env->up != NULL) {
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env = env->up;
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}
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uid = pic_add_variable(pic, env, var);
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}
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return uid;
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}
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pic_sym *
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pic_add_variable(pic_state *pic, struct pic_env *env, pic_value var)
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{
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pic_sym *uid;
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assert(pic_var_p(var));
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uid = pic_uniq(pic, var);
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pic_put_variable(pic, env, var, uid);
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return uid;
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}
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void
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pic_put_variable(pic_state PIC_UNUSED(*pic), struct pic_env *env, pic_value var, pic_sym *uid)
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{
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assert(pic_var_p(var));
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xh_put_ptr(&env->map, pic_ptr(var), &uid);
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}
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pic_sym *
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pic_find_variable(pic_state PIC_UNUSED(*pic), struct pic_env *env, pic_value var)
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{
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xh_entry *e;
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assert(pic_var_p(var));
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if ((e = xh_get_ptr(&env->map, pic_ptr(var))) == NULL) {
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return NULL;
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}
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return xh_val(e, pic_sym *);
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}
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static void
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define_macro(pic_state *pic, pic_sym *uid, struct pic_proc *mac)
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{
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pic_dict_set(pic, pic->macros, uid, pic_obj_value(mac));
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}
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static struct pic_proc *
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find_macro(pic_state *pic, pic_sym *uid)
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{
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if (! pic_dict_has(pic, pic->macros, uid)) {
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return NULL;
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}
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return pic_proc_ptr(pic_dict_ref(pic, pic->macros, uid));
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}
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static pic_value expand(pic_state *, pic_value, struct pic_env *);
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static pic_value expand_lambda(pic_state *, pic_value, struct pic_env *);
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static pic_value
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expand_var(pic_state *pic, pic_value var, struct pic_env *env)
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{
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return pic_obj_value(resolve(pic, var, env));
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}
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static pic_value
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expand_quote(pic_state *pic, pic_value expr)
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{
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return pic_cons(pic, pic_obj_value(pic->uQUOTE), pic_cdr(pic, expr));
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}
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static pic_value
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expand_list(pic_state *pic, pic_value obj, struct pic_env *env)
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{
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size_t ai = pic_gc_arena_preserve(pic);
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pic_value x, head, tail;
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if (pic_pair_p(obj)) {
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head = expand(pic, pic_car(pic, obj), env);
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tail = expand_list(pic, pic_cdr(pic, obj), env);
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x = pic_cons(pic, head, tail);
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} else {
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x = expand(pic, obj, env);
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}
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pic_gc_arena_restore(pic, ai);
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pic_gc_protect(pic, x);
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return x;
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}
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static pic_value
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expand_defer(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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pic_value skel = pic_list1(pic, pic_invalid_value()); /* (#<invalid>) */
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pic_push(pic, pic_cons(pic, expr, skel), env->defer);
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return skel;
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}
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static void
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expand_deferred(pic_state *pic, struct pic_env *env)
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{
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pic_value defer, val, src, dst, it;
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pic_for_each (defer, pic_reverse(pic, env->defer), it) {
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src = pic_car(pic, defer);
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dst = pic_cdr(pic, defer);
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val = expand_lambda(pic, src, env);
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/* copy */
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pic_pair_ptr(dst)->car = pic_car(pic, val);
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pic_pair_ptr(dst)->cdr = pic_cdr(pic, val);
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}
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env->defer = pic_nil_value();
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}
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static pic_value
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expand_lambda(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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pic_value formal, body;
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struct pic_env *in;
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pic_value a;
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if (pic_length(pic, expr) < 2) {
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pic_errorf(pic, "syntax error");
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}
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in = pic_make_env(pic, env);
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for (a = pic_cadr(pic, expr); pic_pair_p(a); a = pic_cdr(pic, a)) {
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pic_value var = pic_car(pic, a);
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if (! pic_var_p(var)) {
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pic_errorf(pic, "syntax error");
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}
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pic_add_variable(pic, in, var);
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}
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if (pic_var_p(a)) {
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pic_add_variable(pic, in, a);
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}
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else if (! pic_nil_p(a)) {
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pic_errorf(pic, "syntax error");
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}
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formal = expand_list(pic, pic_cadr(pic, expr), in);
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body = expand_list(pic, pic_cddr(pic, expr), in);
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expand_deferred(pic, in);
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return pic_cons(pic, pic_obj_value(pic->uLAMBDA), pic_cons(pic, formal, body));
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}
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static pic_value
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expand_define(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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pic_sym *uid;
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pic_value var, val;
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while (pic_length(pic, expr) >= 2 && pic_pair_p(pic_cadr(pic, expr))) {
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var = pic_car(pic, pic_cadr(pic, expr));
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val = pic_cdr(pic, pic_cadr(pic, expr));
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expr = pic_list3(pic, pic_obj_value(pic->uDEFINE), var, pic_cons(pic, pic_obj_value(pic->sLAMBDA), pic_cons(pic, val, pic_cddr(pic, expr))));
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}
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if (pic_length(pic, expr) != 3) {
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pic_errorf(pic, "syntax error");
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}
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var = pic_cadr(pic, expr);
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if (! pic_var_p(var)) {
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pic_errorf(pic, "binding to non-variable object");
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}
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if ((uid = pic_find_variable(pic, env, var)) == NULL) {
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uid = pic_add_variable(pic, env, var);
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}
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val = expand(pic, pic_list_ref(pic, expr, 2), env);
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return pic_list3(pic, pic_obj_value(pic->uDEFINE), pic_obj_value(uid), val);
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}
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static pic_value
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expand_defmacro(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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pic_value var, val;
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pic_sym *uid;
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if (pic_length(pic, expr) != 3) {
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pic_errorf(pic, "syntax error");
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}
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var = pic_cadr(pic, expr);
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if (! pic_var_p(var)) {
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pic_errorf(pic, "binding to non-variable object");
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}
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if ((uid = pic_find_variable(pic, env, var)) == NULL) {
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uid = pic_add_variable(pic, env, var);
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} else {
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pic_warnf(pic, "redefining syntax variable: ~s", var);
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}
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val = pic_cadr(pic, pic_cdr(pic, expr));
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pic_try {
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val = pic_eval(pic, val, env);
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} pic_catch {
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pic_errorf(pic, "expand error while definition: %s", pic_errmsg(pic));
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}
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if (! pic_proc_p(val)) {
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pic_errorf(pic, "macro definition \"~s\" evaluates to non-procedure object", var);
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}
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define_macro(pic, uid, pic_proc_ptr(val));
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return pic_undef_value();
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}
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static pic_value
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expand_macro(pic_state *pic, struct pic_proc *mac, pic_value expr, struct pic_env *env)
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{
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pic_value v;
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#if DEBUG
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puts("before expand-1:");
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pic_debug(pic, expr);
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puts("");
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#endif
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pic_try {
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v = pic_apply2(pic, mac, expr, pic_obj_value(env));
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} pic_catch {
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pic_errorf(pic, "expand error while application: %s", pic_errmsg(pic));
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}
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#if DEBUG
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puts("after expand-1:");
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pic_debug(pic, v);
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puts("");
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#endif
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return v;
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}
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static pic_value
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expand_node(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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switch (pic_type(expr)) {
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case PIC_TT_ID:
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case PIC_TT_SYMBOL: {
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return expand_var(pic, expr, env);
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}
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case PIC_TT_PAIR: {
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struct pic_proc *mac;
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if (! pic_list_p(expr)) {
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pic_errorf(pic, "cannot expand improper list: ~s", expr);
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}
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if (pic_var_p(pic_car(pic, expr))) {
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pic_sym *functor;
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functor = resolve(pic, pic_car(pic, expr), env);
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if (functor == pic->uDEFINE_MACRO) {
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return expand_defmacro(pic, expr, env);
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}
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else if (functor == pic->uLAMBDA) {
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return expand_defer(pic, expr, env);
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}
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else if (functor == pic->uDEFINE) {
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return expand_define(pic, expr, env);
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}
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else if (functor == pic->uQUOTE) {
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return expand_quote(pic, expr);
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}
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if ((mac = find_macro(pic, functor)) != NULL) {
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return expand_node(pic, expand_macro(pic, mac, expr, env), env);
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}
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}
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return expand_list(pic, expr, env);
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}
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default:
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return expr;
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}
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}
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static pic_value
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expand(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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size_t ai = pic_gc_arena_preserve(pic);
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pic_value v;
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#if DEBUG
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printf("[expand] expanding... ");
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pic_debug(pic, expr);
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puts("");
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#endif
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v = expand_node(pic, expr, env);
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pic_gc_arena_restore(pic, ai);
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pic_gc_protect(pic, v);
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return v;
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}
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pic_value
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pic_expand(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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pic_value v;
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#if DEBUG
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puts("before expand:");
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pic_debug(pic, expr);
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puts("");
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#endif
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/* expansion can fail with non-local exit so env->defer should be cleared every time */
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env->defer = pic_nil_value();
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v = expand(pic, expr, env);
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expand_deferred(pic, env);
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#if DEBUG
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puts("after expand:");
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pic_debug(pic, v);
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puts("");
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#endif
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return v;
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}
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static pic_value
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defmacro_call(pic_state *pic)
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{
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struct pic_proc *self = pic_get_proc(pic);
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pic_value args, tmp, proc;
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pic_get_args(pic, "oo", &args, &tmp);
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proc = pic_attr_ref(pic, pic_obj_value(self), "@@transformer");
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return pic_apply_trampoline(pic, pic_proc_ptr(proc), pic_cdr(pic, args));
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}
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void
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pic_defmacro(pic_state *pic, pic_sym *name, pic_sym *id, pic_func_t func)
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{
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struct pic_proc *proc, *trans;
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trans = pic_make_proc(pic, func, pic_symbol_name(pic, name));
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pic_put_variable(pic, pic->lib->env, pic_obj_value(name), id);
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proc = pic_make_proc(pic, defmacro_call, "defmacro_call");
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pic_attr_set(pic, pic_obj_value(proc), "@@transformer", pic_obj_value(trans));
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/* symbol registration */
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define_macro(pic, id, proc);
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/* auto export! */
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pic_export(pic, name);
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}
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static pic_value
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pic_macro_identifier_p(pic_state *pic)
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{
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pic_value obj;
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pic_get_args(pic, "o", &obj);
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return pic_bool_value(pic_id_p(obj));
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}
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static pic_value
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pic_macro_make_identifier(pic_state *pic)
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{
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pic_value var, env;
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pic_get_args(pic, "oo", &var, &env);
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pic_assert_type(pic, var, var);
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pic_assert_type(pic, env, env);
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return pic_obj_value(pic_make_id(pic, var, pic_env_ptr(env)));
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}
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static pic_value
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pic_macro_identifier_variable(pic_state *pic)
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{
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pic_value id;
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pic_get_args(pic, "o", &id);
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pic_assert_type(pic, id, id);
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return pic_id_ptr(id)->var;
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}
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static pic_value
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pic_macro_identifier_environment(pic_state *pic)
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{
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pic_value id;
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pic_get_args(pic, "o", &id);
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pic_assert_type(pic, id, id);
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return pic_obj_value(pic_id_ptr(id)->env);
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}
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static pic_value
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pic_macro_variable_p(pic_state *pic)
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{
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pic_value obj;
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pic_get_args(pic, "o", &obj);
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return pic_bool_value(pic_var_p(obj));
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}
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static pic_value
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pic_macro_variable_eq_p(pic_state *pic)
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{
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pic_value var1, var2;
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pic_get_args(pic, "oo", &var1, &var2);
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pic_assert_type(pic, var1, var);
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pic_assert_type(pic, var2, var);
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if (pic_sym_p(var1) && pic_sym_p(var2)) {
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return pic_bool_value(pic_eq_p(var1, var2));
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}
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if (pic_id_p(var1) && pic_id_p(var2)) {
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struct pic_id *id1, *id2;
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id1 = pic_id_ptr(var1);
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id2 = pic_id_ptr(var2);
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return pic_bool_value(resolve(pic, id1->var, id1->env) == resolve(pic, id2->var, id2->env));
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}
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return pic_false_value();
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}
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void
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pic_init_macro(pic_state *pic)
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{
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pic_defun(pic, "make-identifier", pic_macro_make_identifier);
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pic_defun(pic, "identifier?", pic_macro_identifier_p);
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pic_defun(pic, "identifier-variable", pic_macro_identifier_variable);
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pic_defun(pic, "identifier-environment", pic_macro_identifier_environment);
|
|
|
|
pic_defun(pic, "variable?", pic_macro_variable_p);
|
|
pic_defun(pic, "variable=?", pic_macro_variable_eq_p);
|
|
}
|