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exports.c
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exports.c
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#include "esm/exports.h"
#include "internal.h"
static void collect_binding_names(ant_t *js, sv_ast_t *pat, ant_value_t ns) {
if (!pat) return;
static const void *dispatch[N__COUNT] = {
[N_IDENT] = &&l_ident,
[N_ASSIGN_PAT] = &&l_left,
[N_REST] = &&l_right,
[N_SPREAD] = &&l_right,
[N_ARRAY] = &&l_list,
[N_ARRAY_PAT] = &&l_list,
[N_OBJECT] = &&l_props,
[N_OBJECT_PAT] = &&l_props,
};
if ((unsigned)pat->type < N__COUNT && dispatch[pat->type])
goto *dispatch[pat->type];
return;
l_ident:
setprop_cstr(js, ns, pat->str, pat->len, js_mkundef());
return;
l_left:
collect_binding_names(js, pat->left, ns);
return;
l_right:
collect_binding_names(js, pat->right, ns);
return;
l_list:
for (int i = 0; i < pat->args.count; i++)
collect_binding_names(js, pat->args.items[i], ns);
return;
l_props:
for (int i = 0; i < pat->args.count; i++) {
sv_ast_t *p = pat->args.items[i];
if (!p) continue;
collect_binding_names(js, p->type == N_PROPERTY ? p->right : p, ns);
}
return;
}
static void collect_spec_names(ant_t *js, sv_ast_list_t *specs, ant_value_t ns) {
for (int i = 0; i < specs->count; i++) {
sv_ast_t *spec = specs->items[i];
if (spec && spec->type == N_IMPORT_SPEC && spec->right && spec->right->type == N_IDENT)
setprop_cstr(js, ns, spec->right->str, spec->right->len, js_mkundef());
}}
static void predeclare_decl(ant_t *js, sv_ast_t *decl, ant_value_t ns) {
static const void *dispatch[N__COUNT] = {
[N_VAR] = &&l_var,
[N_FUNC] = &&l_named,
[N_CLASS] = &&l_named,
};
if ((unsigned)decl->type < N__COUNT && dispatch[decl->type])
goto *dispatch[decl->type];
return;
l_var:
for (int i = 0; i < decl->args.count; i++) {
sv_ast_t *var = decl->args.items[i];
if (var && var->type == N_VARDECL)
collect_binding_names(js, var->left, ns);
}
return;
l_named:
if (decl->str && decl->len > 0)
setprop_cstr(js, ns, decl->str, decl->len, js_mkundef());
return;
}
void esm_predeclare_exports(ant_t *js, sv_ast_t *program, ant_value_t ns) {
if (!program || !is_object_type(ns)) return;
for (int i = 0; i < program->args.count; i++) {
sv_ast_t *stmt = program->args.items[i];
if (!stmt || stmt->type != N_EXPORT) continue;
uint16_t f = stmt->flags;
if (f & EX_DEFAULT) setprop_cstr(js, ns, "default", 7, js_mkundef());
else if ((f & EX_DECL) && stmt->left) predeclare_decl(js, stmt->left, ns);
else if ((f & EX_NAMED) || ((f & EX_STAR) && (f & EX_NAMESPACE))) collect_spec_names(js, &stmt->args, ns);
}}

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