separate macroexpand processing into functions
This commit is contained in:
Yuichi Nishiwaki
parent
ffd962290f
commit
113ae32e47
397
src/macro.c
397
src/macro.c
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@ -279,6 +279,218 @@ macroexpand_symbol(pic_state *pic, pic_sym sym, struct pic_senv *senv, pic_value
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}
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}
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static pic_value
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macroexpand_deflibrary(pic_state *pic, pic_value expr)
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{
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struct pic_lib *prev = pic->lib;
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pic_value v;
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if (pic_length(pic, expr) < 2) {
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pic_error(pic, "syntax error");
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}
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pic_make_library(pic, pic_cadr(pic, expr));
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pic_try {
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pic_in_library(pic, pic_cadr(pic, expr));
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pic_for_each (v, pic_cddr(pic, expr)) {
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int ai = pic_gc_arena_preserve(pic);
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pic_eval(pic, v);
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pic_gc_arena_restore(pic, ai);
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}
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pic_in_library(pic, prev->name);
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}
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pic_catch {
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/* restores pic->lib even if an error occurs */
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pic_in_library(pic, prev->name);
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pic_throw(pic, pic->err);
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}
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return pic_none_value();
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}
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static pic_value
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macroexpand_import(pic_state *pic, pic_value expr)
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{
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pic_value spec;
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pic_for_each (spec, pic_cdr(pic, expr)) {
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pic_import(pic, spec);
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}
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return pic_none_value();
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}
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static pic_value
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macroexpand_export(pic_state *pic, pic_value expr)
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{
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pic_value spec;
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pic_for_each (spec, pic_cdr(pic, expr)) {
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if (! pic_sym_p(spec)) {
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pic_error(pic, "syntax error");
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}
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/* TODO: warn if symbol is shadowed by local variable */
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pic_export(pic, pic_sym(spec));
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}
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return pic_none_value();
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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_senv *senv, pic_value assoc_box)
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{
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pic_value var, val;
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pic_sym sym, rename;
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struct pic_macro *mac;
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if (pic_length(pic, expr) != 3) {
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pic_error(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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var = macroexpand(pic, var, senv, assoc_box);
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}
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if (! pic_sym_p(var)) {
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pic_error(pic, "binding to non-symbol object");
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}
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sym = pic_sym(var);
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if (! pic_find_rename(pic, senv, sym, &rename)) {
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rename = pic_add_rename(pic, senv, 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);
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} pic_catch {
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pic_errorf(pic, "macroexpand error: %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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mac = macro_new(pic, pic_proc_ptr(val), senv);
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xh_put(&pic->macros, rename, &mac);
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return pic_none_value();
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}
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static pic_value
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macroexpand_defmacro(pic_state *pic, pic_value expr, struct pic_senv *senv)
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{
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pic_value var, val;
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pic_sym sym, rename;
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struct pic_macro *mac;
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if (pic_length(pic, expr) < 2) {
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pic_error(pic, "syntax error");
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}
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var = pic_car(pic, pic_cdr(pic, expr));
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if (pic_pair_p(var)) {
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/* FIXME: unhygienic */
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val = pic_cons(pic, pic_symbol_value(pic->sLAMBDA),
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pic_cons(pic, pic_cdr(pic, var),
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pic_cdr(pic, pic_cdr(pic, expr))));
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var = pic_car(pic, var);
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}
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else {
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if (pic_length(pic, expr) != 3) {
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pic_error(pic, "syntax_error");
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}
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val = pic_car(pic, pic_cdr(pic, pic_cdr(pic, expr)));
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}
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if (! pic_sym_p(var)) {
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pic_error(pic, "syntax error");
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}
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sym = pic_sym(var);
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if (! pic_find_rename(pic, senv, sym, &rename)) {
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rename = pic_add_rename(pic, senv, sym);
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}
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pic_try {
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val = pic_eval(pic, val);
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} pic_catch {
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pic_errorf(pic, "macroexpand error: %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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mac = macro_new(pic, pic_proc_ptr(val), NULL);
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xh_put(&pic->macros, rename, &mac);
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return pic_none_value();
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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_senv *senv, pic_value assoc_box)
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{
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pic_sym sym;
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pic_value formals;
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if (pic_length(pic, expr) < 2) {
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pic_error(pic, "syntax error");
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}
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formals = pic_cadr(pic, expr);
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if (pic_pair_p(formals)) {
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struct pic_senv *in = senv_new_local(pic, pic_cdr(pic, formals), senv, assoc_box);
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pic_value a;
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/* defined symbol */
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a = pic_car(pic, formals);
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if (! pic_sym_p(a)) {
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a = macroexpand(pic, a, senv, assoc_box);
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}
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if (! pic_sym_p(a)) {
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pic_error(pic, "binding to non-symbol object");
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}
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sym = pic_sym(a);
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if (! pic_find_rename(pic, senv, sym, NULL)) {
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pic_add_rename(pic, senv, sym);
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}
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/* binding value */
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return pic_cons(pic, pic_sym_value(pic->sDEFINE),
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pic_cons(pic,
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macroexpand_list(pic, pic_cadr(pic, expr), in, assoc_box),
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macroexpand_list(pic, pic_cddr(pic, expr), in, assoc_box)));
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}
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if (! pic_sym_p(formals)) {
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formals = macroexpand(pic, formals, senv, assoc_box);
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}
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if (! pic_sym_p(formals)) {
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pic_error(pic, "binding to non-symbol object");
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}
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sym = pic_sym(formals);
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if (! pic_find_rename(pic, senv, sym, NULL)) {
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pic_add_rename(pic, senv, sym);
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}
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return pic_cons(pic, pic_symbol_value(pic->sDEFINE), macroexpand_list(pic, pic_cdr(pic, expr), senv, assoc_box));
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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_senv *senv, pic_value assoc_box)
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{
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struct pic_senv *in = senv_new_local(pic, pic_cadr(pic, expr), senv, assoc_box);
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return pic_cons(pic, pic_sym_value(pic->sLAMBDA),
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pic_cons(pic,
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macroexpand_list(pic, pic_cadr(pic, expr), in, assoc_box),
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macroexpand_list(pic, pic_cddr(pic, expr), in, assoc_box)));
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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_senv *senv, pic_value assoc_box)
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{
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@ -290,16 +502,13 @@ macroexpand_node(pic_state *pic, pic_value expr, struct pic_senv *senv, pic_valu
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switch (pic_type(expr)) {
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case PIC_TT_SC: {
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struct pic_sc *sc;
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sc = pic_sc(expr);
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return macroexpand(pic, sc->expr, sc->senv, assoc_box);
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return macroexpand(pic, pic_sc(expr)->expr, pic_sc(expr)->senv, assoc_box);
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}
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case PIC_TT_SYMBOL: {
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return pic_symbol_value(macroexpand_symbol(pic, pic_sym(expr), senv, assoc_box));
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}
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case PIC_TT_PAIR: {
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pic_value car, v;
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pic_value car;
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xh_entry *e;
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if (! pic_list_p(expr)) {
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@ -311,195 +520,31 @@ macroexpand_node(pic_state *pic, pic_value expr, struct pic_senv *senv, pic_valu
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pic_sym tag = pic_sym(car);
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if (tag == pic->sDEFINE_LIBRARY) {
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struct pic_lib *prev = pic->lib;
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if (pic_length(pic, expr) < 2) {
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pic_error(pic, "syntax error");
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}
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pic_make_library(pic, pic_cadr(pic, expr));
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pic_try {
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pic_in_library(pic, pic_cadr(pic, expr));
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pic_for_each (v, pic_cddr(pic, expr)) {
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int ai = pic_gc_arena_preserve(pic);
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pic_eval(pic, v);
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pic_gc_arena_restore(pic, ai);
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}
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pic_in_library(pic, prev->name);
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}
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pic_catch {
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/* restores pic->lib even if an error occurs */
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pic_in_library(pic, prev->name);
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pic_throw(pic, pic->err);
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}
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return pic_none_value();
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return macroexpand_deflibrary(pic, expr);
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}
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else if (tag == pic->sIMPORT) {
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pic_value spec;
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pic_for_each (spec, pic_cdr(pic, expr)) {
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pic_import(pic, spec);
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}
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return pic_none_value();
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return macroexpand_import(pic, expr);
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}
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else if (tag == pic->sEXPORT) {
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pic_value spec;
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pic_for_each (spec, pic_cdr(pic, expr)) {
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if (! pic_sym_p(spec)) {
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pic_error(pic, "syntax error");
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}
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/* TODO: warn if symbol is shadowed by local variable */
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pic_export(pic, pic_sym(spec));
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}
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return pic_none_value();
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return macroexpand_export(pic, expr);
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}
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else if (tag == pic->sDEFINE_SYNTAX) {
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pic_value var, val;
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pic_sym sym, rename;
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struct pic_macro *mac;
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if (pic_length(pic, expr) != 3) {
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pic_error(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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var = macroexpand(pic, var, senv, assoc_box);
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}
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if (! pic_sym_p(var)) {
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pic_error(pic, "binding to non-symbol object");
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}
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sym = pic_sym(var);
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if (! pic_find_rename(pic, senv, sym, &rename)) {
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rename = pic_add_rename(pic, senv, 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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v = pic_eval(pic, val);
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} pic_catch {
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pic_errorf(pic, "macroexpand error: %s", pic_errmsg(pic));
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}
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if (! pic_proc_p(v)) {
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pic_errorf(pic, "macro definition \"~s\" evaluates to non-procedure object", var);
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}
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mac = macro_new(pic, pic_proc_ptr(v), senv);
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xh_put(&pic->macros, rename, &mac);
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return pic_none_value();
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return macroexpand_defsyntax(pic, expr, senv, assoc_box);
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}
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else if (tag == pic->sDEFINE_MACRO) {
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pic_value var, val;
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pic_sym sym, rename;
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struct pic_macro *mac;
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if (pic_length(pic, expr) < 2) {
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pic_error(pic, "syntax error");
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}
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var = pic_car(pic, pic_cdr(pic, expr));
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if (pic_pair_p(var)) {
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/* FIXME: unhygienic */
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val = pic_cons(pic, pic_symbol_value(pic->sLAMBDA),
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pic_cons(pic, pic_cdr(pic, var),
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pic_cdr(pic, pic_cdr(pic, expr))));
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var = pic_car(pic, var);
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}
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else {
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if (pic_length(pic, expr) != 3) {
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pic_error(pic, "syntax_error");
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}
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val = pic_car(pic, pic_cdr(pic, pic_cdr(pic, expr)));
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}
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if (! pic_sym_p(var)) {
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pic_error(pic, "syntax error");
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}
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sym = pic_sym(var);
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if (! pic_find_rename(pic, senv, sym, &rename)) {
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rename = pic_add_rename(pic, senv, sym);
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}
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pic_try {
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v = pic_eval(pic, val);
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} pic_catch {
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pic_errorf(pic, "macroexpand error: %s", pic_errmsg(pic));
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}
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if (! pic_proc_p(v)) {
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pic_errorf(pic, "macro definition \"~s\" evaluates to non-procedure object", var);
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}
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mac = macro_new(pic, pic_proc_ptr(v), NULL);
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xh_put(&pic->macros, rename, &mac);
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return pic_none_value();
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return macroexpand_defmacro(pic, expr, senv);
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}
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else if (tag == pic->sLAMBDA) {
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struct pic_senv *in = senv_new_local(pic, pic_cadr(pic, expr), senv, assoc_box);
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return pic_cons(pic, car,
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pic_cons(pic,
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macroexpand_list(pic, pic_cadr(pic, expr), in, assoc_box),
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macroexpand_list(pic, pic_cddr(pic, expr), in, assoc_box)));
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return macroexpand_lambda(pic, expr, senv, assoc_box);
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}
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else if (tag == pic->sDEFINE) {
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pic_sym sym;
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pic_value formals;
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if (pic_length(pic, expr) < 2) {
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pic_error(pic, "syntax error");
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}
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formals = pic_cadr(pic, expr);
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if (pic_pair_p(formals)) {
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struct pic_senv *in = senv_new_local(pic, pic_cdr(pic, formals), senv, assoc_box);
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pic_value a;
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/* defined symbol */
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a = pic_car(pic, formals);
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if (! pic_sym_p(a)) {
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a = macroexpand(pic, a, senv, assoc_box);
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}
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if (! pic_sym_p(a)) {
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pic_error(pic, "binding to non-symbol object");
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}
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sym = pic_sym(a);
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if (! pic_find_rename(pic, senv, sym, NULL)) {
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pic_add_rename(pic, senv, sym);
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}
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/* binding value */
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return pic_cons(pic, car,
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pic_cons(pic,
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macroexpand_list(pic, pic_cadr(pic, expr), in, assoc_box),
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macroexpand_list(pic, pic_cddr(pic, expr), in, assoc_box)));
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}
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if (! pic_sym_p(formals)) {
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formals = macroexpand(pic, formals, senv, assoc_box);
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}
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if (! pic_sym_p(formals)) {
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pic_error(pic, "binding to non-symbol object");
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}
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sym = pic_sym(formals);
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if (! pic_find_rename(pic, senv, sym, NULL)) {
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pic_add_rename(pic, senv, sym);
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}
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return pic_cons(pic, pic_symbol_value(tag), macroexpand_list(pic, pic_cdr(pic, expr), senv, assoc_box));
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return macroexpand_define(pic, expr, senv, assoc_box);
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}
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else if (tag == pic->sQUOTE) {
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