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 "errors.h"
	#include "runtime.h"
	#include "internal.h"
	#include "modules/symbol.h"

	typedef struct {
	jsval_t sym;
	char key[32];
	} wellknown_sym_t;

	static wellknown_sym_t g_iterator = {0};
	static wellknown_sym_t g_asyncIterator = {0};
	static wellknown_sym_t g_toStringTag = {0};
	static wellknown_sym_t g_hasInstance = {0};
	static wellknown_sym_t g_observable = {0};
	static wellknown_sym_t g_toPrimitive = {0};
	static wellknown_sym_t g_species = {0};

	const char *get_iterator_sym_key(void) { return g_iterator.key; }
	const char *get_asyncIterator_sym_key(void) { return g_asyncIterator.key; }
	const char *get_toStringTag_sym_key(void) { return g_toStringTag.key; }
	const char *get_observable_sym_key(void) { return g_observable.key; }
	const char *get_toPrimitive_sym_key(void) { return g_toPrimitive.key; }
	const char *get_hasInstance_sym_key(void) { return g_hasInstance.key; }

	static const struct { jsval_t sym; const char name; } sym_table[] = {
	{ &g_iterator.sym, "Symbol.iterator" },
	{ &g_asyncIterator.sym, "Symbol.asyncIterator" },
	{ &g_toStringTag.sym, "Symbol.toStringTag" },
	{ &g_hasInstance.sym, "Symbol.hasInstance" },
	{ &g_observable.sym, "Symbol.observable" },
	{ &g_toPrimitive.sym, "Symbol.toPrimitive" },
	{ &g_species.sym, "Symbol.species" },
	};

	const char get_symbol_description_from_key(const char sym_key, size_t key_len) {
	if (key_len < 9 \|\| memcmp(sym_key, "__sym_", 6) != 0) return NULL;

	uint64_t id = 0;
	for (const char p = sym_key + 6; p >= '0' && p <= '9'; p++) id = id 10 + (*p - '0');

	for (size_t i = 0; i < sizeof(sym_table) / sizeof(sym_table[0]); i++) {
	if (js_sym_id(*sym_table[i].sym) == id) return sym_table[i].name;
	}

	return "Symbol()";
	}

	static inline void init_symbol(struct js js, wellknown_sym_t sym_var, const char *name) {
	sym_var->sym = js_mksym(js, name);
	snprintf(sym_var->key, sizeof(sym_var->key), "__sym_%llu__", (unsigned long long)js_sym_id(sym_var->sym));
	}

	static jsval_t builtin_Symbol(struct js js, jsval_t args, int nargs) {
	const char *desc = NULL;
	if (nargs > 0 && vtype(args[0]) == T_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 \|\| vtype(args[0]) != T_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 \|\| vtype(args[0]) != T_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 builtin_Symbol_toString(struct js js, jsval_t args, int nargs) {
	jsval_t this_val = js_getthis(js);

	if (vtype(this_val) != T_SYMBOL) {
	return js_mkerr(js, "Symbol.prototype.toString requires a symbol");
	}

	return js_symbol_to_string(js, this_val);
	}

	static jsval_t iterator_next(struct js js, jsval_t args, int 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_true);
	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_false);
	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) {
	jsval_t arr = js_getthis(js);

	jsval_t len_val = js_get(js, arr, "length");
	int len = vtype(len_val) == T_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) {
	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_true);
	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_false);
	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;
	}

	static jsval_t species_getter(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return js_getthis(js);
	}

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

	const char *hint = "default";
	if (nargs > 0 && vtype(args[0]) == T_STR) {
	hint = js_getstr(js, args[0], NULL);
	} bool prefer_string = (hint == NULL \|\| strcmp(hint, "number") != 0);

	const char *methods[2] = {
	prefer_string ? "toString" : "valueOf",
	prefer_string ? "valueOf" : "toString"
	};

	for (int i = 0; i < 2; i++) {
	jsval_t method = js_getprop_fallback(js, this_val, methods[i]);
	if (vtype(method) == T_FUNC \|\| vtype(method) == T_CFUNC) {
	jsval_t result = js_call_with_this(js, method, this_val, NULL, 0);
	if (is_err(result) \|\| !is_object_type(result)) return result;
	}
	}

	return js_mkerr(js, "Cannot convert object to primitive value");
	}


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

	init_symbol(js, &g_iterator, "Symbol.iterator");
	init_symbol(js, &g_asyncIterator, "Symbol.asyncIterator");
	init_symbol(js, &g_toStringTag, "Symbol.toStringTag");
	init_symbol(js, &g_observable, "Symbol.observable");
	init_symbol(js, &g_toPrimitive, "Symbol.toPrimitive");
	init_symbol(js, &g_hasInstance, "Symbol.hasInstance");
	init_symbol(js, &g_species, "Symbol.species");

	jsval_t symbol_proto = js_mkobj(js);
	js_set(js, symbol_proto, "toString", js_mkfun(builtin_Symbol_toString));

	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, "prototype", symbol_proto);

	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);
	js_set(js, symbol_ctor, "toPrimitive", g_toPrimitive.sym);
	js_set(js, symbol_ctor, "species", g_species.sym);

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

	// set internal types before ant module snapshot
	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_iterator.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_iterator.key, js_mkfun(string_iterator));

	jsval_t date_ctor = js_get(js, js_glob(js), "Date");
	jsval_t date_proto = js_get(js, date_ctor, "prototype");
	js_set(js, date_proto, g_toPrimitive.key, js_mkfun(date_toPrimitive));

	jsval_t promise_ctor = js_get(js, js_glob(js), "Promise");
	jsval_t promise_proto = js_get(js, promise_ctor, "prototype");
	js_set(js, promise_proto, g_toStringTag.key, js_mkstr(js, "Promise", 7));

	jsval_t species_fn = js_mkfun(species_getter);
	js_set_getter_desc(js, promise_ctor, g_species.key, strlen(g_species.key), species_fn, JS_DESC_C);
	js_set_getter_desc(js, array_ctor, g_species.key, strlen(g_species.key), species_fn, JS_DESC_C);
	}

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