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ant/src/esm/commonjs.c
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commonjs.c
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#include "esm/commonjs.h"
#include "esm/loader.h"
#include "internal.h"
#include "reactor.h"
#include "errors.h"
#include "silver/compiler.h"
#include "silver/vm.h"
#include <libgen.h>
#include <string.h>
#include <stdlib.h>
static jsval_t esm_cjs_require(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 1 || vtype(args[0]) != T_STR)
return js_mkerr(js, "require() expects a string specifier");
jsval_t fn = js_getcurrentfunc(js);
jsval_t data = js_get_slot(js, fn, SLOT_DATA);
const char *prev_filename = js->filename;
if (vtype(data) == T_STR) {
jsoff_t path_len = 0;
jsoff_t path_off = vstr(js, data, &path_len);
(void)path_len;
js_set_filename(js, (const char *)&js->mem[path_off]);
}
jsval_t ns = js_esm_import_sync(js, args[0]);
js_set_filename(js, prev_filename);
if (is_err(ns)) return ns;
if (vtype(ns) == T_OBJ) {
jsval_t default_export = js_get_slot(js, ns, SLOT_DEFAULT);
if (vtype(default_export) != T_UNDEF) return default_export;
}
return ns;
}
static jsval_t esm_cjs_require_resolve(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 1 || vtype(args[0]) != T_STR) {
return js_mkerr(js, "require.resolve() expects a string specifier");
}
jsval_t fn = js_getcurrentfunc(js);
jsval_t data = js_get_slot(js, fn, SLOT_DATA);
const char *base_path = js->filename ? js->filename : ".";
if (vtype(data) == T_STR) {
jsoff_t data_len = 0;
jsoff_t data_off = vstr(js, data, &data_len);
base_path = (const char *)&js->mem[data_off];
}
jsval_t resolved = js_esm_resolve_specifier(js, args[0], base_path);
if (is_err(resolved)) return resolved;
if (vtype(resolved) != T_STR) return resolved;
jsoff_t len = 0;
jsoff_t off = vstr(js, resolved, &len);
const char *s = (const char *)&js->mem[off];
static const char *prefix = "file://";
if ((size_t)len >= strlen(prefix) && strncmp(s, prefix, strlen(prefix)) == 0) {
const char *path_part = s + strlen(prefix);
size_t path_len = (size_t)len - strlen(prefix);
return js_mkstr(js, path_part, path_len);
}
return resolved;
}
static jsval_t esm_populate_cjs_namespace(ant_t *js, jsval_t ns, jsval_t exports_val) {
jsval_t set_default = setprop_cstr(js, ns, "default", 7, exports_val);
if (is_err(set_default)) return set_default;
js_set_slot(js, ns, SLOT_DEFAULT, exports_val);
if (!is_object_type(exports_val)) return js_mkundef();
ant_iter_t iter = js_prop_iter_begin(js, exports_val);
const char *key = NULL;
size_t key_len = 0;
while (js_prop_iter_next(&iter, &key, &key_len, NULL)) {
if (key_len == 7 && memcmp(key, "default", 7) == 0) continue;
jsval_t value = js_get(js, exports_val, key);
if (is_err(value)) { js_prop_iter_end(&iter); return value; }
jsval_t res = setprop_cstr(js, ns, key, key_len, value);
if (is_err(res)) { js_prop_iter_end(&iter); return res; }
}
js_prop_iter_end(&iter);
return js_mkundef();
}
static jsval_t esm_eval_commonjs_function(
ant_t *js,
const char *code,
size_t code_len,
jsval_t require_fn,
jsval_t module_obj,
jsval_t exports_obj,
jsval_t filename_val,
jsval_t dirname_val
) {
static const char *cjs_params = "require,module,exports,__filename,__dirname";
sv_func_t *compiled = sv_compile_function_parts(
js, cjs_params,
strlen(cjs_params),
code, code_len,
false
);
if (!compiled) {
if (js->thrown_exists) return mkval(T_ERR, 0);
return js_mkerr_typed(js, JS_ERR_INTERNAL | JS_ERR_NO_STACK, "Unexpected compile error");
}
js_clear_error_site(js);
jsval_t args[] = {require_fn, module_obj, exports_obj, filename_val, dirname_val};
return sv_execute_entry(js->vm, compiled, exports_obj, args, 5);
}
jsval_t esm_load_commonjs_module(
ant_t *js,
const char *module_path, const char *code,
size_t code_len, jsval_t ns
) {
char *path_copy = strdup(module_path);
if (!path_copy) return js_mkerr(js, "OOM loading CommonJS module");
jsval_t module_obj = js_mkobj(js);
jsval_t exports_obj = js_mkobj(js);
js_set(js, module_obj, "exports", exports_obj);
js_set(js, module_obj, "loaded", js_false);
js_set(js, module_obj, "id", js_mkstr(js, module_path, strlen(module_path)));
js_set(js, module_obj, "filename", js_mkstr(js, module_path, strlen(module_path)));
jsval_t require_fn = js_heavy_mkfun(
js, esm_cjs_require,
js_mkstr(js, module_path, strlen(module_path))
);
jsval_t require_resolve_fn = js_heavy_mkfun(
js, esm_cjs_require_resolve,
js_mkstr(js, module_path, strlen(module_path))
);
js_set(js, require_fn, "resolve", require_resolve_fn);
char *dir = dirname(path_copy);
jsval_t dirname_val = js_mkstr(js, dir, strlen(dir));
jsval_t filename_val = js_mkstr(js, module_path, strlen(module_path));
const char *prev_filename = js->filename;
js_set_filename(js, module_path);
jsval_t result = esm_eval_commonjs_function(
js, code, code_len,
require_fn, module_obj, exports_obj,
filename_val, dirname_val
);
if (vtype(result) == T_PROMISE) js_run_event_loop(js);
js_set(js, module_obj, "loaded", js_true);
jsval_t exports_val = js_get(js, module_obj, "exports");
if (!is_err(result) && !js->thrown_exists) {
jsval_t ns_res = esm_populate_cjs_namespace(js, ns, exports_val);
if (is_err(ns_res)) result = ns_res;
}
js_set_filename(js, prev_filename);
free(path_copy);
if (is_err(result)) return result;
return exports_val;
}

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