symbol.c
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symbol.c
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	#include <stdlib.h>
	#include <string.h>
	#include <stdio.h>

	#include "ant.h"
	#include "runtime.h"
	#include "modules/symbol.h"

	#define MAX_REGISTRY 256
	static struct {
	char *key;
	jsval_t symbol;
	} g_symbol_registry[MAX_REGISTRY];
	static int g_registry_count = 0;

	static jsval_t g_iterator_sym = 0;
	static jsval_t g_toStringTag_sym = 0;
	static jsval_t g_hasInstance_sym = 0;

	static char g_iter_sym_key[32] = {0};
	static char g_toStringTag_sym_key[32] = {0};

	jsval_t get_iterator_symbol(void) { return g_iterator_sym; }
	const char *get_iterator_sym_key(void) { return g_iter_sym_key; }
	const char *get_toStringTag_sym_key(void) { return g_toStringTag_sym_key; }

	static jsval_t builtin_Symbol(struct js js, jsval_t args, int nargs) {
	const char *desc = NULL;
	if (nargs > 0 && js_type(args[0]) == JS_STR) {
	desc = js_getstr(js, args[0], NULL);
	}
	return js_mksym(js, desc);
	}

	static jsval_t builtin_Symbol_for(struct js js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| js_type(args[0]) != JS_STR) {
	return js_mkerr(js, "Symbol.for requires a string argument");
	}

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

	for (int i = 0; i < g_registry_count; i++) {
	if (g_symbol_registry[i].key && strcmp(g_symbol_registry[i].key, key) == 0) {
	return g_symbol_registry[i].symbol;
	}
	}

	if (g_registry_count >= MAX_REGISTRY) {
	return js_mkerr(js, "Symbol registry full");
	}

	jsval_t sym = js_mksym(js, key);
	g_symbol_registry[g_registry_count].key = strdup(key);
	g_symbol_registry[g_registry_count].symbol = sym;

	jsval_t sym_obj = js_mkobj(js);
	js_set(js, sym_obj, "__sym_id", js_get(js, sym, "__sym_id"));
	js_set(js, sym_obj, "description", js_get(js, sym, "description"));
	js_set(js, sym_obj, "__registry_key", js_mkstr(js, key, strlen(key)));

	g_symbol_registry[g_registry_count].symbol = sym;
	g_registry_count++;

	return sym;
	}

	static bool is_symbol_val(struct js *js, jsval_t v) {
	if (js_type(v) != JS_OBJ) return false;
	jsval_t marker = js_get(js, v, "__sym__");
	return js_type(marker) == JS_TRUE;
	}

	static jsval_t builtin_Symbol_keyFor(struct js js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| !is_symbol_val(js, args[0])) {
	return js_mkundef();
	}

	jsval_t sym = args[0];
	jsval_t sym_id = js_get(js, sym, "__sym_id");

	for (int i = 0; i < g_registry_count; i++) {
	jsval_t reg_id = js_get(js, g_symbol_registry[i].symbol, "__sym_id");
	if (js_type(sym_id) == JS_NUM && js_type(reg_id) == JS_NUM &&
	js_getnum(sym_id) == js_getnum(reg_id)) {
	return js_mkstr(js, g_symbol_registry[i].key, strlen(g_symbol_registry[i].key));
	}
	}

	return js_mkundef();
	}

	static jsval_t iterator_next(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js_getthis(js);

	jsval_t arr = js_get(js, this_val, "__arr");
	jsval_t idx_val = js_get(js, this_val, "__idx");
	jsval_t len_val = js_get(js, this_val, "__len");

	int idx = (int)js_getnum(idx_val);
	int len = (int)js_getnum(len_val);

	jsval_t result = js_mkobj(js);

	if (idx >= len) {
	js_set(js, result, "done", js_mktrue());
	js_set(js, result, "value", js_mkundef());
	} else {
	char idxstr[16];
	snprintf(idxstr, sizeof(idxstr), "%d", idx);
	jsval_t value = js_get(js, arr, idxstr);
	js_set(js, result, "value", value);
	js_set(js, result, "done", js_mkfalse());
	js_set(js, this_val, "__idx", js_mknum(idx + 1));
	}

	return result;
	}

	static jsval_t array_iterator(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t arr = js_getthis(js);

	jsval_t len_val = js_get(js, arr, "length");
	int len = js_type(len_val) == JS_NUM ? (int)js_getnum(len_val) : 0;

	jsval_t iter = js_mkobj(js);
	js_set(js, iter, "__arr", arr);
	js_set(js, iter, "__idx", js_mknum(0));
	js_set(js, iter, "__len", js_mknum(len));
	js_set(js, iter, "next", js_mkfun(iterator_next));

	return iter;
	}

	static jsval_t string_iterator_next(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_val = js_getthis(js);

	jsval_t str = js_get(js, this_val, "__str");
	jsval_t idx_val = js_get(js, this_val, "__idx");
	jsval_t len_val = js_get(js, this_val, "__len");

	int idx = (int)js_getnum(idx_val);
	int len = (int)js_getnum(len_val);

	jsval_t result = js_mkobj(js);

	if (idx >= len) {
	js_set(js, result, "done", js_mktrue());
	js_set(js, result, "value", js_mkundef());
	} else {
	char *s = js_getstr(js, str, NULL);
	char ch[2] = {s[idx], 0};
	js_set(js, result, "value", js_mkstr(js, ch, 1));
	js_set(js, result, "done", js_mkfalse());
	js_set(js, this_val, "__idx", js_mknum(idx + 1));
	}

	return result;
	}

	static jsval_t string_iterator(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t str = js_getthis(js);

	size_t len;
	js_getstr(js, str, &len);

	jsval_t iter = js_mkobj(js);
	js_set(js, iter, "__str", str);
	js_set(js, iter, "__idx", js_mknum(0));
	js_set(js, iter, "__len", js_mknum((double)len));
	js_set(js, iter, "next", js_mkfun(string_iterator_next));

	return iter;
	}

	void init_symbol_module(void) {
	struct js *js = rt->js;

	g_iterator_sym = js_mksym(js, "Symbol.iterator");
	g_toStringTag_sym = js_mksym(js, "Symbol.toStringTag");
	g_hasInstance_sym = js_mksym(js, "Symbol.hasInstance");

	jsval_t iter_sym_id = js_get(js, g_iterator_sym, "__sym_id");
	snprintf(g_iter_sym_key, sizeof(g_iter_sym_key), "__sym_%.0f__", js_getnum(iter_sym_id));

	jsval_t tag_sym_id = js_get(js, g_toStringTag_sym, "__sym_id");
	snprintf(g_toStringTag_sym_key, sizeof(g_toStringTag_sym_key), "__sym_%.0f__", js_getnum(tag_sym_id));

	jsval_t symbol_ctor = js_mkobj(js);
	js_set(js, symbol_ctor, "__native_func", js_mkfun(builtin_Symbol));
	js_setprop(js, symbol_ctor, js_mkstr(js, "for", 3), js_mkfun(builtin_Symbol_for));
	js_set(js, symbol_ctor, "keyFor", js_mkfun(builtin_Symbol_keyFor));

	js_set(js, symbol_ctor, "iterator", g_iterator_sym);
	js_set(js, symbol_ctor, "toStringTag", g_toStringTag_sym);
	js_set(js, symbol_ctor, "hasInstance", g_hasInstance_sym);

	jsval_t func_symbol = symbol_ctor;
	(uint64_t)&func_symbol = (func_symbol & ~((uint64_t)0xF << 48)) \| ((uint64_t)0x7 << 48);

	js_set(js, js_glob(js), "Symbol", func_symbol);

	jsval_t array_ctor = js_get(js, js_glob(js), "Array");
	jsval_t array_proto = js_get(js, array_ctor, "prototype");
	js_set(js, array_proto, g_iter_sym_key, js_mkfun(array_iterator));

	jsval_t string_ctor = js_get(js, js_glob(js), "String");
	jsval_t string_proto = js_get(js, string_ctor, "prototype");
	js_set(js, string_proto, g_iter_sym_key, js_mkfun(string_iterator));
	}

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