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implement import/export syntax

This commit is contained in:
Yuichi Nishiwaki 2013-12-07 09:42:34 -08:00
parent 60337bac0e
commit 818430bb81
3 changed files with 42 additions and 5 deletions
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1
include/picrin.h
View File

@ -124,6 +124,7 @@ pic_value pic_macroexpand(pic_state *, pic_value);
void pic_make_library(pic_state *, const char *);
void pic_in_library(pic_state *, const char *);
struct pic_lib *pic_find_library(pic_state *, pic_value);
void pic_abort(pic_state *, const char *);
void pic_raise(pic_state *, pic_value);

12
src/lib.c
View File

@ -42,3 +42,15 @@ pic_in_library(pic_state *pic, const char *name)
pic->lib = pic_lib_ptr(pic_cdr(pic, v));
}
struct pic_lib *
pic_find_library(pic_state *pic, pic_value spec)
{
pic_value v;
v = pic_assoc(pic, spec, pic->lib_tbl);
if (pic_false_p(v)) {
return NULL;
}
return pic_lib_ptr(pic_cdr(pic, v));
}

34
src/macro.c
View File

@ -238,17 +238,41 @@ macroexpand(pic_state *pic, pic_value expr, struct pic_senv *senv)
pic_value program;
struct pic_senv *senv;
/* FIXME: replace it with null-env once import is implemented */
senv = pic_core_syntactic_env(pic);
senv = pic_minimal_syntactic_env(pic);
if (pic_length(pic, expr) < 2) {
pic_error(pic, "syntax error");
}
program = macroexpand_list(pic, pic_cddr(pic, expr), senv);
return pic_cons(pic, pic_symbol_value(pic->sBEGIN), program);
}
case PIC_STX_IMPORT:
case PIC_STX_IMPORT: {
struct pic_lib *lib;
struct xh_iterator it;
lib = pic_find_library(pic, pic_cadr(pic, expr));
if (! lib) {
pic_error(pic, "library not found");
}
it = xh_begin(lib->exports);
while (! xh_isend(&it)) {
xh_put(pic->lib->senv->tbl, it.e->key, it.e->val);
xh_next(lib->exports, &it);
}
return pic_false_value();
}
case PIC_STX_EXPORT: {
puts("FIXME: import/export");
abort();
pic_sym orig, ren;
pic_value v;
orig = ren = pic_sym(pic_car(pic, expr));
v = macroexpand(pic, pic_car(pic, expr), senv);
if (pic_symbol_p(v)) {
ren = pic_sym(v);
}
xh_put(pic->lib->exports, pic_symbol_name(pic, orig), (int)ren);
return pic_false_value();
}
case PIC_STX_DEFSYNTAX: {
pic_value var, val;