url.c
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url.c
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	#include <compat.h> // IWYU pragma: keep

	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <ctype.h>
	#include <uriparser/Uri.h>

	#include "ant.h"
	#include "errors.h"
	#include "internal.h"
	#include "runtime.h"
	#include "utils.h"
	#include "descriptors.h"

	#include "modules/url.h"
	#include "modules/symbol.h"

	typedef struct {
	char *protocol;
	char *username;
	char *password;
	char *hostname;
	char *port;
	char *pathname;
	char *search;
	char *hash;
	} parsed_url_t;

	static void free_parsed_url(parsed_url_t *p) {
	if (p->protocol) free(p->protocol);
	if (p->username) free(p->username);
	if (p->password) free(p->password);
	if (p->hostname) free(p->hostname);
	if (p->port) free(p->port);
	if (p->pathname) free(p->pathname);
	if (p->search) free(p->search);
	if (p->hash) free(p->hash);
	}

	static char url_encode_component(const char str) {
	if (!str) return strdup("");
	size_t len = strlen(str);
	char out = malloc(len 3 + 1);
	if (!out) return NULL;
	size_t j = 0;
	for (size_t i = 0; i < len; i++) {
	unsigned char c = (unsigned char)str[i];
	if (isalnum(c) \|\| c == '-' \|\| c == '_' \|\| c == '.' \|\| c == '~') {
	out[j++] = c;
	} else {
	snprintf(out + j, 4, "%%%02X", c);
	j += 3;
	}
	}
	out[j] = '\0';
	return out;
	}

	static char url_decode_component(const char str) {
	if (!str) return strdup("");
	size_t len = strlen(str);
	char *out = malloc(len + 1);
	if (!out) return NULL;
	size_t j = 0;
	for (size_t i = 0; i < len; i++) {
	if (str[i] == '%' && i + 2 < len && isxdigit(str[i+1]) && isxdigit(str[i+2])) {
	int hi = isdigit(str[i+1]) ? str[i+1] - '0' : tolower(str[i+1]) - 'a' + 10;
	int lo = isdigit(str[i+2]) ? str[i+2] - '0' : tolower(str[i+2]) - 'a' + 10;
	out[j++] = (char)((hi << 4) \| lo);
	i += 2;
	}
	else if (str[i] == '+') out[j++] = ' ';
	else out[j++] = str[i];
	}
	out[j] = '\0';
	return out;
	}

	static char uri_range_dup(const UriTextRangeA range) {
	if (!range->first \|\| !range->afterLast) return strdup("");
	size_t len = (size_t)(range->afterLast - range->first);
	return strndup(range->first, len);
	}

	static void uri_to_parsed(const UriUriA uri, parsed_url_t out) {
	char *scheme = uri_range_dup(&uri->scheme);
	size_t slen = strlen(scheme);
	out->protocol = malloc(slen + 2);
	memcpy(out->protocol, scheme, slen);
	out->protocol[slen] = ':';
	out->protocol[slen + 1] = '\0';
	free(scheme);

	char *userinfo = uri_range_dup(&uri->userInfo);
	char *colon = strchr(userinfo, ':');
	if (colon) {
	*colon = '\0';
	out->username = strdup(userinfo);
	out->password = strdup(colon + 1);
	} else {
	out->username = strdup(userinfo);
	out->password = strdup("");
	}
	free(userinfo);

	out->hostname = uri_range_dup(&uri->hostText);
	out->port = uri_range_dup(&uri->portText);

	size_t path_cap = 1;
	for (UriPathSegmentA *seg = uri->pathHead; seg; seg = seg->next)
	path_cap += (size_t)(seg->text.afterLast - seg->text.first) + 1;
	char *path = malloc(path_cap + 1);
	size_t pos = 0;
	for (UriPathSegmentA *seg = uri->pathHead; seg; seg = seg->next) {
	path[pos++] = '/';
	size_t slen_uri = (size_t)(seg->text.afterLast - seg->text.first);
	memcpy(path + pos, seg->text.first, slen_uri);
	pos += slen_uri;
	}
	if (pos == 0) path[pos++] = '/';
	path[pos] = '\0';
	out->pathname = path;

	char *query = uri_range_dup(&uri->query);
	if (*query) {
	out->search = malloc(strlen(query) + 2);
	out->search[0] = '?';
	strcpy(out->search + 1, query);
	} else out->search = strdup("");
	free(query);

	char *frag = uri_range_dup(&uri->fragment);
	if (*frag) {
	out->hash = malloc(strlen(frag) + 2);
	out->hash[0] = '#';
	strcpy(out->hash + 1, frag);
	} else out->hash = strdup("");
	free(frag);
	}

	static const char coerce_to_string(ant_t js, jsval_t val, size_t *len) {
	if (vtype(val) == T_STR) return js_getstr(js, val, len);
	if (is_object_type(val)) {
	jsval_t href = js_get(js, val, "href");
	if (vtype(href) == T_STR) return js_getstr(js, href, len);
	}
	return NULL;
	}

	static int parse_url(const char url_str, const char base_str, parsed_url_t *out) {
	memset(out, 0, sizeof(*out));

	UriUriA uri;
	const char *errorPos;

	if (base_str && !strstr(url_str, "://")) {
	UriUriA base_uri, rel_uri, resolved;

	if (uriParseSingleUriA(&base_uri, base_str, &errorPos) != URI_SUCCESS)
	return -1;

	if (uriParseSingleUriA(&rel_uri, url_str, &errorPos) != URI_SUCCESS) {
	uriFreeUriMembersA(&base_uri);
	return -1;
	}

	if (uriAddBaseUriA(&resolved, &rel_uri, &base_uri) != URI_SUCCESS) {
	uriFreeUriMembersA(&base_uri);
	uriFreeUriMembersA(&rel_uri);
	return -1;
	}

	uriNormalizeSyntaxA(&resolved);
	uri_to_parsed(&resolved, out);

	uriFreeUriMembersA(&resolved);
	uriFreeUriMembersA(&rel_uri);
	uriFreeUriMembersA(&base_uri);
	return 0;
	}

	if (uriParseSingleUriA(&uri, url_str, &errorPos) != URI_SUCCESS)
	return -1;

	uri_to_parsed(&uri, out);
	uriFreeUriMembersA(&uri);
	return 0;
	}

	static char *build_href(
	const char protocol, const char username, const char *password,
	const char hostname, const char port, const char *pathname,
	const char search, const char hash
	) {
	size_t len = strlen(protocol) + 2 + strlen(hostname) + strlen(pathname) + strlen(search) + strlen(hash) + 32;
	if (username && *username) len += strlen(username) + strlen(password) + 2;
	if (port && *port) len += strlen(port) + 1;

	char *href = malloc(len);
	if (!href) return NULL;

	size_t used = 0;
	size_t remaining = len;

	int written = snprintf(href + used, remaining, "%s//", protocol);
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }
	used += (size_t)written;
	remaining -= (size_t)written;

	if (username && *username) {
	written = snprintf(href + used, remaining, "%s", username);
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }
	used += (size_t)written;
	remaining -= (size_t)written;

	if (password && *password) {
	written = snprintf(href + used, remaining, ":%s", password);
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }
	used += (size_t)written;
	remaining -= (size_t)written;
	}

	written = snprintf(href + used, remaining, "@");
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }
	used += (size_t)written;
	remaining -= (size_t)written;
	}

	written = snprintf(href + used, remaining, "%s", hostname);
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }
	used += (size_t)written;
	remaining -= (size_t)written;

	if (port && *port) {
	written = snprintf(href + used, remaining, ":%s", port);
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }
	used += (size_t)written;
	remaining -= (size_t)written;
	}

	written = snprintf(href + used, remaining, "%s%s%s", pathname, search, hash);
	if (written < 0) { href[0] = '\0'; return href; }
	if ((size_t)written >= remaining) { href[len - 1] = '\0'; return href; }

	return href;
	}

	static void update_url_href(ant_t *js, jsval_t url_obj) {
	char *protocol = js_getstr(js, js_get(js, url_obj, "protocol"), NULL);
	char *username = js_getstr(js, js_get(js, url_obj, "username"), NULL);
	char *password = js_getstr(js, js_get(js, url_obj, "password"), NULL);
	char *hostname = js_getstr(js, js_get(js, url_obj, "hostname"), NULL);
	char *port = js_getstr(js, js_get(js, url_obj, "port"), NULL);
	char *pathname = js_getstr(js, js_get(js, url_obj, "pathname"), NULL);
	char *search = js_getstr(js, js_get(js, url_obj, "search"), NULL);
	char *hash = js_getstr(js, js_get(js, url_obj, "hash"), NULL);

	char *host;
	if (port && *port) {
	size_t hlen = strlen(hostname) + strlen(port) + 2;
	host = malloc(hlen);
	snprintf(host, hlen, "%s:%s", hostname, port);
	} else {
	host = strdup(hostname ? hostname : "");
	}
	js_set(js, url_obj, "host", js_mkstr(js, host, strlen(host)));

	char *origin;
	if (port && *port) {
	size_t olen = strlen(protocol) + strlen(hostname) + strlen(port) + 8;
	origin = malloc(olen);
	snprintf(origin, olen, "%s//%s:%s", protocol ? protocol : "", hostname ? hostname : "", port);
	} else {
	size_t olen = strlen(protocol) + strlen(hostname) + 8;
	origin = malloc(olen);
	snprintf(origin, olen, "%s//%s", protocol ? protocol : "", hostname ? hostname : "");
	}
	js_set(js, url_obj, "origin", js_mkstr(js, origin, strlen(origin)));

	char *href = build_href(
	protocol ? protocol : "", username ? username : "",
	password ? password : "", hostname ? hostname : "",
	port ? port : "", pathname ? pathname : "/",
	search ? search : "", hash ? hash : ""
	);

	js_set(js, url_obj, "href", js_mkstr(js, href, strlen(href)));

	free(host);
	free(origin);
	free(href);
	}

	static jsval_t url_toString(ant_t js, jsval_t args, int nargs) {
	return js_get(js, js_getthis(js), "href");
	}

	static jsval_t js_URLSearchParams(ant_t js, jsval_t args, int nargs) {
	jsval_t usp = js_mkobj(js);
	jsval_t proto = js_get_ctor_proto(js, "URLSearchParams", 15);
	if (is_special_object(proto)) js_set_proto(js, usp, proto);

	jsval_t entries = js_mkarr(js);
	js_set_slot(js, usp, SLOT_ENTRIES, entries);

	if (nargs < 1 \|\| vtype(args[0]) != T_STR) return usp;
	char *init = js_getstr(js, args[0], NULL);
	if (!init) return usp;

	const char *p = init;
	if (*p == '?') p++;

	parse_pair:
	if (!*p) return usp;
	const char *amp = strchr(p, '&');
	size_t plen = amp ? (size_t)(amp - p) : strlen(p);
	char *pair = strndup(p, plen);
	char *eq = strchr(pair, '=');
	char key = pair, val = eq ? (eq[0] = '\0', eq + 1) : "";
	char *dk = url_decode_component(key);
	char *dv = url_decode_component(val);
	jsval_t entry = js_mkarr(js);
	js_arr_push(js, entry, js_mkstr(js, dk, strlen(dk)));
	js_arr_push(js, entry, js_mkstr(js, dv, strlen(dv)));
	js_arr_push(js, entries, entry);
	free(pair); free(dk); free(dv);
	if (!amp) return usp;
	p = amp + 1;
	goto parse_pair;
	}

	static jsval_t js_URL(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "TypeError: URL requires at least 1 argument");

	char *url_str = js_getstr(js, args[0], NULL);
	char base_str = (nargs > 1) ? (char )coerce_to_string(js, args[1], NULL) : NULL;
	if (!url_str) return js_mkerr(js, "TypeError: Invalid URL");

	parsed_url_t parsed;
	if (parse_url(url_str, base_str, &parsed) < 0) {
	return js_mkerr(js, "TypeError: Invalid URL");
	}

	jsval_t url_obj = js_mkobj(js);
	jsval_t proto = js_get_ctor_proto(js, "URL", 3);
	if (is_special_object(proto)) js_set_proto(js, url_obj, proto);

	js_set(js, url_obj, "protocol", js_mkstr(js, parsed.protocol, strlen(parsed.protocol)));
	js_set(js, url_obj, "username", js_mkstr(js, parsed.username, strlen(parsed.username)));
	js_set(js, url_obj, "password", js_mkstr(js, parsed.password, strlen(parsed.password)));
	js_set(js, url_obj, "hostname", js_mkstr(js, parsed.hostname, strlen(parsed.hostname)));
	js_set(js, url_obj, "port", js_mkstr(js, parsed.port, strlen(parsed.port)));
	js_set(js, url_obj, "pathname", js_mkstr(js, parsed.pathname, strlen(parsed.pathname)));
	js_set(js, url_obj, "search", js_mkstr(js, parsed.search, strlen(parsed.search)));
	js_set(js, url_obj, "hash", js_mkstr(js, parsed.hash, strlen(parsed.hash)));

	update_url_href(js, url_obj);

	jsval_t search_params = js_mkobj(js);
	jsval_t usp_proto = js_get_ctor_proto(js, "URLSearchParams", 15);
	if (is_special_object(usp_proto)) js_set_proto(js, search_params, usp_proto);
	js_set_slot(js, search_params, SLOT_DATA, url_obj);
	if (parsed.search && *parsed.search) {
	const char *qs = parsed.search[0] == '?' ? parsed.search + 1 : parsed.search;
	jsval_t arg = js_mkstr(js, qs, strlen(qs));
	jsval_t tmp = js_URLSearchParams(js, &arg, 1);
	js_set_slot(js, search_params, SLOT_ENTRIES, js_get_slot(js, tmp, SLOT_ENTRIES));
	} else {
	js_set_slot(js, search_params, SLOT_ENTRIES, js_mkarr(js));
	}
	js_set(js, url_obj, "searchParams", search_params);

	free_parsed_url(&parsed);
	return url_obj;
	}

	static jsval_t usp_get(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mknull();
	jsval_t this_val = js_getthis(js);

	char *key = js_getstr(js, args[0], NULL);
	if (!key) return js_mknull();

	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	if (!is_special_object(entries)) return js_mknull();

	jsoff_t len = js_arr_len(js, entries);
	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *ks = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	if (ks && strcmp(ks, key) == 0) return js_arr_get(js, entry, 1);
	}

	return js_mknull();
	}

	static jsval_t usp_getAll(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkarr(js);
	jsval_t this_val = js_getthis(js);

	char *key = js_getstr(js, args[0], NULL);
	if (!key) return js_mkarr(js);

	jsval_t result = js_mkarr(js);
	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	if (!is_special_object(entries)) return result;

	jsoff_t len = js_arr_len(js, entries);
	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *ks = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	if (ks && strcmp(ks, key) == 0) js_arr_push(js, result, js_arr_get(js, entry, 1));
	}

	return result;
	}

	static jsval_t usp_has(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_false;
	jsval_t this_val = js_getthis(js);

	char *key = js_getstr(js, args[0], NULL);
	if (!key) return js_false;

	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	if (!is_special_object(entries)) return js_false;

	jsoff_t len = js_arr_len(js, entries);
	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *ks = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	if (ks && strcmp(ks, key) == 0) return js_true;
	}

	return js_false;
	}

	static void usp_sync_url(ant_t *js, jsval_t this_val) {
	jsval_t url_obj = js_get_slot(js, this_val, SLOT_DATA);
	if (!is_special_object(url_obj)) return;

	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	jsoff_t len = js_arr_len(js, entries);

	size_t buf_size = 1024;
	char *buf = try_oom(buf_size);
	size_t pos = 0;

	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *k = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	char *v = js_getstr(js, js_arr_get(js, entry, 1), NULL);
	if (!k) continue;

	char *ek = url_encode_component(k);
	char *ev = url_encode_component(v ? v : "");

	size_t needed = strlen(ek) + strlen(ev) + 3;
	if (pos + needed >= buf_size) {
	buf_size = buf_size * 2 + needed;
	buf = realloc(buf, buf_size);
	if (!buf) { free(buf); return; }
	}

	buf[pos] = pos == 0 ? '?' : '&'; pos++;
	pos += sprintf(buf + pos, "%s=%s", ek, ev);
	free(ek); free(ev);
	}

	buf[pos] = '\0';
	js_set(js, url_obj, "search", js_mkstr(js, buf, pos));
	update_url_href(js, url_obj);
	free(buf);
	}

	static jsval_t usp_set(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkundef();
	jsval_t this_val = js_getthis(js);

	char *key = js_getstr(js, args[0], NULL);
	if (!key) return js_mkundef();

	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	jsoff_t len = js_arr_len(js, entries);

	jsval_t new_entries = js_mkarr(js);
	int found = 0;

	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *ks = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	if (ks && strcmp(ks, key) == 0) {
	if (!found) {
	jsval_t new_entry = js_mkarr(js);
	js_arr_push(js, new_entry, args[0]);
	js_arr_push(js, new_entry, args[1]);
	js_arr_push(js, new_entries, new_entry);
	found = 1;
	}
	} else js_arr_push(js, new_entries, entry);
	}

	if (!found) {
	jsval_t new_entry = js_mkarr(js);
	js_arr_push(js, new_entry, args[0]);
	js_arr_push(js, new_entry, args[1]);
	js_arr_push(js, new_entries, new_entry);
	}

	js_set_slot(js, this_val, SLOT_ENTRIES, new_entries);
	usp_sync_url(js, this_val);

	return js_mkundef();
	}

	static jsval_t usp_append(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkundef();
	jsval_t this_val = js_getthis(js);

	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	jsval_t entry = js_mkarr(js);
	js_arr_push(js, entry, args[0]);
	js_arr_push(js, entry, args[1]);
	js_arr_push(js, entries, entry);

	usp_sync_url(js, this_val);
	return js_mkundef();
	}

	static jsval_t usp_delete(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkundef();
	jsval_t this_val = js_getthis(js);
	char *key = js_getstr(js, args[0], NULL);
	if (!key) return js_mkundef();

	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	jsoff_t len = js_arr_len(js, entries);

	jsval_t new_entries = js_mkarr(js);
	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *ks = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	if (!ks \|\| strcmp(ks, key) != 0) js_arr_push(js, new_entries, entry);
	}

	js_set_slot(js, this_val, SLOT_ENTRIES, new_entries);
	usp_sync_url(js, this_val);
	js->needs_gc = true;

	return js_mkundef();
	}

	static jsval_t usp_toString(ant_t js, jsval_t args, int nargs) {
	jsval_t this_val = js_getthis(js);
	jsval_t entries = js_get_slot(js, this_val, SLOT_ENTRIES);
	jsoff_t len = js_arr_len(js, entries);

	size_t buf_size = 1024;
	char *buf = try_oom(buf_size);
	size_t pos = 0;

	for (jsoff_t i = 0; i < len; i++) {
	jsval_t entry = js_arr_get(js, entries, i);
	char *k = js_getstr(js, js_arr_get(js, entry, 0), NULL);
	char *v = js_getstr(js, js_arr_get(js, entry, 1), NULL);
	if (!k) continue;

	char *ek = url_encode_component(k);
	char *ev = url_encode_component(v ? v : "");
	size_t needed = strlen(ek) + strlen(ev) + 3;

	if (pos + needed >= buf_size) {
	buf_size = buf_size * 2 + needed;
	buf = realloc(buf, buf_size);
	if (!buf) { free(buf); return js_mkstr(js, "", 0); }
	}

	if (pos > 0) buf[pos++] = '&';
	pos += sprintf(buf + pos, "%s=%s", ek, ev);
	free(ek);
	free(ev);
	}

	buf[pos] = '\0';
	jsval_t ret = js_mkstr(js, buf, pos);
	free(buf);

	return ret;
	}

	void init_url_module(void) {
	ant_t *js = rt->js;
	jsval_t glob = js->global;

	jsval_t url_ctor = js_mkobj(js);
	jsval_t url_proto = js_mkobj(js);

	js_set(js, url_proto, "toString", js_mkfun(url_toString));
	js_set_sym(js, url_proto, get_toStringTag_sym(), js_mkstr(js, "URL", 3));

	js_set_slot(js, url_ctor, SLOT_CFUNC, js_mkfun(js_URL));
	js_mkprop_fast(js, url_ctor, "prototype", 9, url_proto);
	js_mkprop_fast(js, url_ctor, "name", 4, ANT_STRING("URL"));
	js_set_descriptor(js, url_ctor, "name", 4, 0);

	js_set(js, glob, "URL", js_obj_to_func(url_ctor));

	jsval_t usp_ctor = js_mkobj(js);
	jsval_t usp_proto = js_mkobj(js);

	js_set(js, usp_proto, "get", js_mkfun(usp_get));
	js_set(js, usp_proto, "getAll", js_mkfun(usp_getAll));
	js_set(js, usp_proto, "has", js_mkfun(usp_has));
	js_set(js, usp_proto, "set", js_mkfun(usp_set));
	js_set(js, usp_proto, "append", js_mkfun(usp_append));
	js_set(js, usp_proto, "delete", js_mkfun(usp_delete));
	js_set(js, usp_proto, "toString", js_mkfun(usp_toString));
	js_set_sym(js, usp_proto, get_toStringTag_sym(), js_mkstr(js, "URLSearchParams", 15));

	js_set_slot(js, usp_ctor, SLOT_CFUNC, js_mkfun(js_URLSearchParams));
	js_mkprop_fast(js, usp_ctor, "prototype", 9, usp_proto);
	js_mkprop_fast(js, usp_ctor, "name", 4, ANT_STRING("URLSearchParams"));
	js_set_descriptor(js, usp_ctor, "name", 4, 0);

	js_set(js, glob, "URLSearchParams", js_obj_to_func(usp_ctor));
	}

	static jsval_t builtin_fileURLToPath(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "fileURLToPath requires a string or URL argument");

	size_t len;
	const char *str = coerce_to_string(js, args[0], &len);
	if (!str) return js_mkerr(js, "fileURLToPath requires a string or URL argument");

	parsed_url_t parsed;
	if (parse_url(str, NULL, &parsed) != 0)
	return js_mkerr(js, "Invalid URL");

	if (strcmp(parsed.protocol, "file:") != 0) {
	free_parsed_url(&parsed);
	return js_mkerr(js, "fileURLToPath requires a file: URL");
	}

	char *decoded = url_decode_component(parsed.pathname);
	free_parsed_url(&parsed);
	if (!decoded) return js_mkerr(js, "allocation failure");

	jsval_t ret = js_mkstr(js, decoded, strlen(decoded));
	free(decoded);
	return ret;
	}

	static jsval_t builtin_pathToFileURL(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| vtype(args[0]) != T_STR)
	return js_mkerr(js, "pathToFileURL requires a string argument");

	size_t len;
	const char *path = js_getstr(js, args[0], &len);

	size_t total = 7 + len;
	char *buf = malloc(total + 1);
	if (!buf) return js_mkerr(js, "allocation failure");

	memcpy(buf, "file://", 7);
	memcpy(buf + 7, path, len);
	buf[total] = '\0';

	jsval_t url_args[1] = { js_mkstr(js, buf, total) };
	free(buf);

	return js_URL(js, url_args, 1);
	}

	jsval_t url_library(ant_t *js) {
	jsval_t lib = js_mkobj(js);
	jsval_t glob = js_glob(js);

	js_set(js, lib, "URL", js_get(js, glob, "URL"));
	js_set(js, lib, "URLSearchParams", js_get(js, glob, "URLSearchParams"));
	js_set(js, lib, "fileURLToPath", js_mkfun(builtin_fileURLToPath));
	js_set(js, lib, "pathToFileURL", js_mkfun(builtin_pathToFileURL));
	js_set(js, lib, "default", lib);

	return lib;
	}

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