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Add basic support for identifier macros

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Daphne Preston-Kendal 2021-12-29 23:52:46 +01:00
parent 6615a74609
commit 770b4d367b
1 changed files with 25 additions and 9 deletions
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32
eval.c
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@ -1051,6 +1051,22 @@ static sexp analyze_letrec_syntax (sexp ctx, sexp x, int depth) {
return analyze_let_syntax_aux(ctx, x, 1, depth);
}
static sexp analyze_macro_once (sexp ctx, sexp x, sexp op, int depth) {
sexp res;
sexp_gc_var1(tmp);
sexp_gc_preserve1(ctx, tmp);
tmp = sexp_cons(ctx, sexp_macro_env(op), SEXP_NULL);
tmp = sexp_cons(ctx, sexp_context_env(ctx), tmp);
tmp = sexp_cons(ctx, x, tmp);
res = sexp_exceptionp(tmp) ? tmp : sexp_make_child_context(ctx, sexp_context_lambda(ctx));
if (!sexp_exceptionp(res) && !sexp_exceptionp(sexp_context_exception(ctx)))
res = sexp_apply(res, sexp_macro_proc(op), tmp);
if (sexp_exceptionp(res) && sexp_not(sexp_exception_source(x)))
sexp_exception_source(res) = sexp_pair_source(sexp_car(tmp));
sexp_gc_release1(ctx);
return res;
}
static sexp analyze (sexp ctx, sexp object, int depth, int defok) {
sexp op;
sexp_gc_var4(res, tmp, x, cell);
@ -1115,14 +1131,7 @@ static sexp analyze (sexp ctx, sexp object, int depth, int defok) {
res = sexp_compile_error(ctx, "unknown core form", op); break;
}
} else if (sexp_macrop(op)) {
tmp = sexp_cons(ctx, sexp_macro_env(op), SEXP_NULL);
tmp = sexp_cons(ctx, sexp_context_env(ctx), tmp);
tmp = sexp_cons(ctx, x, tmp);
x = sexp_exceptionp(tmp) ? tmp : sexp_make_child_context(ctx, sexp_context_lambda(ctx));
if (!sexp_exceptionp(x) && !sexp_exceptionp(sexp_context_exception(ctx)))
x = sexp_apply(x, sexp_macro_proc(op), tmp);
if (sexp_exceptionp(x) && sexp_not(sexp_exception_source(x)))
sexp_exception_source(x) = sexp_pair_source(sexp_car(tmp));
x = analyze_macro_once(ctx, x, op, depth);
goto loop;
} else if (sexp_opcodep(op)) {
res = sexp_length(ctx, sexp_cdr(x));
@ -1154,7 +1163,14 @@ static sexp analyze (sexp ctx, sexp object, int depth, int defok) {
sexp_warn(ctx, "invalid operator in application: ", x);
}
} else if (sexp_idp(x)) {
cell = sexp_env_cell(ctx, sexp_context_env(ctx), x, 0);
op = cell ? sexp_cdr(cell) : NULL;
if (op && sexp_macrop(op)) {
x = analyze_macro_once(ctx, x, op, depth);
goto loop;
} else {
res = analyze_var_ref(ctx, x, NULL);
}
} else if (sexp_synclop(x)) {
tmp = sexp_make_child_context(ctx, sexp_context_lambda(ctx));
if (sexp_pairp(sexp_synclo_free_vars(x))) {