481 lines
11 KiB
C
481 lines
11 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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pic_sym *
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pic_add_rename(pic_state *pic, struct pic_env *env, pic_sym *sym)
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{
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pic_sym *rename = pic_gensym(pic, sym);
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pic_put_rename(pic, env, sym, rename);
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return rename;
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}
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void
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pic_put_rename(pic_state *pic, struct pic_env *env, pic_sym *sym, pic_sym *rename)
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{
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pic_dict_set(pic, env->map, sym, pic_obj_value(rename));
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}
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pic_sym *
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pic_find_rename(pic_state *pic, struct pic_env *env, pic_sym *sym)
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{
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if (! pic_dict_has(pic, env->map, sym)) {
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return NULL;
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}
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return pic_sym_ptr(pic_dict_ref(pic, env->map, sym));
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}
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static void
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define_macro(pic_state *pic, pic_sym *rename, struct pic_proc *mac)
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{
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pic_dict_set(pic, pic->macros, rename, 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 *rename)
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{
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if (! pic_dict_has(pic, pic->macros, rename)) {
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return NULL;
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}
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return pic_proc_ptr(pic_dict_ref(pic, pic->macros, rename));
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}
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static pic_sym *
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make_identifier(pic_state *pic, pic_sym *sym, struct pic_env *env)
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{
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pic_sym *rename;
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while (true) {
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if ((rename = pic_find_rename(pic, env, sym)) != NULL) {
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return rename;
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}
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if (! env->up)
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break;
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env = env->up;
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}
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if (! pic_interned_p(pic, sym)) {
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return sym;
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}
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else {
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return pic_gensym(pic, sym);
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}
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}
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static pic_value macroexpand(pic_state *, pic_value, struct pic_env *);
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static pic_value macroexpand_lambda(pic_state *, pic_value, struct pic_env *);
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static pic_value
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macroexpand_symbol(pic_state *pic, pic_sym *sym, struct pic_env *env)
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{
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return pic_obj_value(make_identifier(pic, sym, env));
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}
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static pic_value
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macroexpand_quote(pic_state *pic, pic_value expr)
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{
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return pic_cons(pic, pic_obj_value(pic->rQUOTE), pic_cdr(pic, expr));
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}
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static pic_value
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macroexpand_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 = macroexpand(pic, pic_car(pic, obj), env);
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tail = macroexpand_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 = macroexpand(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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macroexpand_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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macroexpand_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 = macroexpand_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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macroexpand_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 v = pic_car(pic, a);
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if (! pic_sym_p(v)) {
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pic_errorf(pic, "syntax error");
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}
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pic_add_rename(pic, in, pic_sym_ptr(v));
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}
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if (pic_sym_p(a)) {
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pic_add_rename(pic, in, pic_sym_ptr(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 = macroexpand_list(pic, pic_cadr(pic, expr), in);
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body = macroexpand_list(pic, pic_cddr(pic, expr), in);
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macroexpand_deferred(pic, in);
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return pic_cons(pic, pic_obj_value(pic->rLAMBDA), pic_cons(pic, formal, body));
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}
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static pic_value
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macroexpand_define(pic_state *pic, pic_value expr, struct pic_env *env)
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{
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pic_sym *sym, *rename;
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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->rDEFINE), var, pic_cons(pic, pic_obj_value(pic->rLAMBDA), 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_sym_p(var)) {
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pic_errorf(pic, "binding to non-symbol object");
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}
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sym = pic_sym_ptr(var);
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if ((rename = pic_find_rename(pic, env, sym)) == NULL) {
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rename = pic_add_rename(pic, env, sym);
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}
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val = macroexpand(pic, pic_list_ref(pic, expr, 2), env);
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return pic_list3(pic, pic_obj_value(pic->rDEFINE), pic_obj_value(rename), val);
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}
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static pic_value
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macroexpand_defsyntax(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 *sym, *rename;
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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_sym_p(var)) {
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pic_errorf(pic, "binding to non-symbol object");
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}
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sym = pic_sym_ptr(var);
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if ((rename = pic_find_rename(pic, env, sym)) == NULL) {
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rename = pic_add_rename(pic, env, sym);
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} else {
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pic_warnf(pic, "redefining syntax variable: ~s", pic_obj_value(sym));
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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, pic->lib);
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} pic_catch {
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pic_errorf(pic, "macroexpand 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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val = pic_apply1(pic, pic_proc_ptr(val), pic_obj_value(env));
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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, rename, 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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macroexpand_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, args;
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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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args = pic_list2(pic, expr, pic_obj_value(env));
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pic_try {
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v = pic_apply(pic, mac, args);
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} pic_catch {
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pic_errorf(pic, "macroexpand 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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macroexpand_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_SYMBOL: {
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return macroexpand_symbol(pic, pic_sym_ptr(expr), env);
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}
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case PIC_TT_PAIR: {
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pic_value car;
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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 macroexpand improper list: ~s", expr);
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}
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car = macroexpand(pic, pic_car(pic, expr), env);
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if (pic_sym_p(car)) {
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pic_sym *tag = pic_sym_ptr(car);
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if (tag == pic->rDEFINE_SYNTAX) {
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return macroexpand_defsyntax(pic, expr, env);
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}
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else if (tag == pic->rLAMBDA) {
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return macroexpand_defer(pic, expr, env);
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}
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else if (tag == pic->rDEFINE) {
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return macroexpand_define(pic, expr, env);
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}
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else if (tag == pic->rQUOTE) {
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return macroexpand_quote(pic, expr);
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}
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if ((mac = find_macro(pic, tag)) != NULL) {
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return macroexpand_node(pic, macroexpand_macro(pic, mac, expr, env), env);
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}
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}
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return pic_cons(pic, car, macroexpand_list(pic, pic_cdr(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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macroexpand(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("[macroexpand] expanding... ");
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pic_debug(pic, expr);
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puts("");
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#endif
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v = macroexpand_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_macroexpand(pic_state *pic, pic_value expr, struct pic_lib *lib)
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{
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struct pic_lib *prev;
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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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/* change library for macro-expansion time processing */
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prev = pic->lib;
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pic->lib = lib;
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lib->env->defer = pic_nil_value(); /* the last expansion could fail and leave defer field old */
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v = macroexpand(pic, expr, lib->env);
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macroexpand_deferred(pic, lib->env);
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pic->lib = prev;
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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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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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struct pic_dict *map;
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map = pic_make_dict(pic);
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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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env->map = map;
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return env;
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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_rename(pic, pic->lib->env, 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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bool
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pic_identifier_p(pic_state *pic, pic_value obj)
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{
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return pic_sym_p(obj) && ! pic_interned_p(pic, pic_sym_ptr(obj));
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}
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bool
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pic_identifier_eq_p(pic_state *pic, struct pic_env *env1, pic_sym *sym1, struct pic_env *env2, pic_sym *sym2)
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{
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pic_sym *a, *b;
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a = make_identifier(pic, sym1, env1);
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if (a != make_identifier(pic, sym1, env1)) {
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a = sym1;
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}
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b = make_identifier(pic, sym2, env2);
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if (b != make_identifier(pic, sym2, env2)) {
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b = sym2;
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}
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return pic_eq_p(pic_obj_value(a), pic_obj_value(b));
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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_identifier_p(pic, 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 obj;
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pic_sym *sym;
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pic_get_args(pic, "mo", &sym, &obj);
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pic_assert_type(pic, obj, env);
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return pic_obj_value(make_identifier(pic, sym, pic_env_ptr(obj)));
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}
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static pic_value
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pic_macro_identifier_eq_p(pic_state *pic)
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{
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pic_sym *sym1, *sym2;
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pic_value env1, env2;
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pic_get_args(pic, "omom", &env1, &sym1, &env2, &sym2);
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pic_assert_type(pic, env1, env);
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pic_assert_type(pic, env2, env);
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return pic_bool_value(pic_identifier_eq_p(pic, pic_env_ptr(env1), sym1, pic_env_ptr(env2), sym2));
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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, "identifier?", pic_macro_identifier_p);
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pic_defun(pic, "identifier=?", pic_macro_identifier_eq_p);
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pic_defun(pic, "make-identifier", pic_macro_make_identifier);
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}
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