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"

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

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

	jsval_t get_iterator_symbol(void) { return g_iterator_sym; }
	jsval_t get_asyncIterator_symbol(void) { return g_asyncIterator_sym; }
	jsval_t get_observable_symbol(void) { return g_observable_sym; }

	const char *get_iterator_sym_key(void) { return g_iter_sym_key; }
	const char *get_asyncIterator_sym_key(void) { return g_asyncIter_sym_key; }
	const char *get_toStringTag_sym_key(void) { return g_toStringTag_sym_key; }
	const char *get_observable_sym_key(void) { return g_observable_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");

	return js_mksym_for(js, key);
	}

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

	const char *key = js_sym_key(args[0]);
	if (!key) return js_mkundef();

	return js_mkstr(js, key, strlen(key));
	}

	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;
	}

	const char get_symbol_description_from_key(const char sym_key, size_t key_len) {
	if (
	key_len < 9 \|\| sym_key[0] != '_' \|\| sym_key[1] != '_' \|\|
	sym_key[2] != 's' \|\| sym_key[3] != 'y' \|\| sym_key[4] != 'm' \|\| sym_key[5] != '_'
	) return NULL;

	if (g_iter_sym_key[0] && strncmp(sym_key, g_iter_sym_key, key_len) == 0 && g_iter_sym_key[key_len] == '\0') return "Symbol.iterator";
	if (g_toStringTag_sym_key[0] && strncmp(sym_key, g_toStringTag_sym_key, key_len) == 0 && g_toStringTag_sym_key[key_len] == '\0') return "Symbol.toStringTag";

	return "Symbol()";
	}

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

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

	snprintf(g_iter_sym_key, sizeof(g_iter_sym_key), "__sym_%llu__", (unsigned long long)js_sym_id(g_iterator_sym));
	snprintf(g_asyncIter_sym_key, sizeof(g_asyncIter_sym_key), "__sym_%llu__", (unsigned long long)js_sym_id(g_asyncIterator_sym));
	snprintf(g_toStringTag_sym_key, sizeof(g_toStringTag_sym_key), "__sym_%llu__", (unsigned long long)js_sym_id(g_toStringTag_sym));
	snprintf(g_observable_sym_key, sizeof(g_observable_sym_key), "__sym_%llu__", (unsigned long long)js_sym_id(g_observable_sym));

	jsval_t symbol_ctor = js_mkobj(js);
	js_set_slot(js, symbol_ctor, SLOT_CFUNC, 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, "asyncIterator", g_asyncIterator_sym);
	js_set(js, symbol_ctor, "toStringTag", g_toStringTag_sym);
	js_set(js, symbol_ctor, "hasInstance", g_hasInstance_sym);
	js_set(js, symbol_ctor, "observable", g_observable_sym);

	jsval_t func_symbol = js_obj_to_func(symbol_ctor);
	js_set(js, js_glob(js), "Symbol", func_symbol);

	// set internal types before module ready
	js_set(js, rt->ant_obj, get_toStringTag_sym_key(), js_mkstr(js, "Ant", 3));

	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));

	jsval_t map_ctor = js_get(js, js_glob(js), "Map");
	jsval_t map_proto = js_get(js, map_ctor, "prototype");
	js_set(js, map_proto, g_toStringTag_sym_key, js_mkstr(js, "Map", 3));

	jsval_t set_ctor = js_get(js, js_glob(js), "Set");
	jsval_t set_proto = js_get(js, set_ctor, "prototype");
	js_set(js, set_proto, g_toStringTag_sym_key, js_mkstr(js, "Set", 3));
	}

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