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ant/src/modules/module.c
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module.c
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#include <compat.h> // IWYU pragma: keep
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include "ant.h"
#include "errors.h"
#include "internal.h"
#include "esm/loader.h"
#include "esm/library.h"
#include "modules/symbol.h"
typedef struct { ant_t *js; jsval_t arr; } builtin_iter_ctx_t;
static void push_builtin_name(const char *name, void *ud) {
builtin_iter_ctx_t *ctx = (builtin_iter_ctx_t *)ud;
js_arr_push(ctx->js, ctx->arr, js_mkstr(ctx->js, name, strlen(name)));
}
static jsval_t builtin_createRequire_call(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 plen = 0;
jsoff_t poff = vstr(js, data, &plen);
js_set_filename(js, (const char *)&js->mem[poff]);
}
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;
}
// require.resolve(specifier)
static jsval_t builtin_createRequire_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 dlen = 0;
jsoff_t doff = vstr(js, data, &dlen);
base_path = (const char *)&js->mem[doff];
}
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 plen = (size_t)len - strlen(prefix);
return js_mkstr(js, path_part, plen);
}
return resolved;
}
// createRequire(filename)
static jsval_t builtin_createRequire(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 1) return js_mkerr(js, "createRequire() requires a filename argument");
jsval_t filename_val = args[0];
if (vtype(filename_val) != T_STR)
return js_mkerr(js, "createRequire() filename must be a string");
size_t fname_len;
char *fname = js_getstr(js, filename_val, &fname_len);
if (!fname) return js_mkerr(js, "createRequire() invalid filename");
const char *path = fname;
size_t path_len = fname_len;
static const char *file_prefix = "file://";
size_t prefix_len = strlen(file_prefix);
if (path_len >= prefix_len && strncmp(path, file_prefix, prefix_len) == 0) {
path += prefix_len;
path_len -= prefix_len;
}
jsval_t path_val = js_mkstr(js, path, path_len);
jsval_t require_fn = js_heavy_mkfun(js, builtin_createRequire_call, path_val);
jsval_t resolve_fn = js_heavy_mkfun(js, builtin_createRequire_resolve, path_val);
js_set(js, require_fn, "resolve", resolve_fn);
return require_fn;
}
// Module._resolveFilename(request, parent)
static jsval_t builtin_resolveFilename(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 1 || vtype(args[0]) != T_STR)
return js_mkerr(js, "Module._resolveFilename() requires a string request");
const char *base_path = js->filename ? js->filename : ".";
if (nargs >= 2 && vtype(args[1]) == T_OBJ) {
jsval_t parent_filename = js_get(js, args[1], "filename");
if (vtype(parent_filename) == T_STR) {
jsoff_t plen = 0;
jsoff_t poff = vstr(js, parent_filename, &plen);
base_path = (const char *)&js->mem[poff];
}
}
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 plen = (size_t)len - strlen(prefix);
return js_mkstr(js, path_part, plen);
}
return resolved;
}
jsval_t module_library(ant_t *js) {
jsval_t lib = js_mkobj(js);
js_set(js, lib, "createRequire", js_mkfun(builtin_createRequire));
jsval_t modules_arr = js_mkarr(js);
builtin_iter_ctx_t ctx = { js, modules_arr };
ant_library_foreach(push_builtin_name, &ctx);
js_set(js, lib, "builtinModules", modules_arr);
js_set(js, lib, "_resolveFilename", js_mkfun(builtin_resolveFilename));
js_set_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "Module", 6));
return lib;
}

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