main.c
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main.c
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	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <libgen.h>
	#include <limits.h>
	#include <signal.h>

	#include "ant.h"
	#include "config.h"
	#include "argtable3.h"

	#include "modules/io.h"
	#include "modules/server.h"

	static struct {
	char *path;
	jsval_t exports;
	} *module_cache = NULL;

	static int module_count = 0;
	static int module_capacity = 0;

	static struct {
	struct js *js;
	jsval_t handler;
	} signal_handlers[32] = {0};

	static void general_signal_handler(int signum) {
	if (signum >= 0 && signum < 32 && signal_handlers[signum].js != NULL) {
	struct js *js = signal_handlers[signum].js;
	jsval_t handler = signal_handlers[signum].handler;

	if (js_type(handler) != JS_UNDEF) {
	jsval_t sig_num = js_mknum(signum);
	jsval_t args[1] = {sig_num};
	js_call(js, handler, args, 1);
	}
	}

	exit(0);
	}

	static jsval_t js_signal(struct js js, jsval_t args, int nargs) {
	if (nargs < 2) {
	fprintf(stderr, "Error: Ant.signal() requires 2 arguments (signal, handler)\n");
	return js_mkundef();
	}

	char *signal_name = js_getstr(js, args[0], NULL);
	if (signal_name == NULL) {
	return js_mkerr(js, "signal name must be a string");
	}

	int signum = -1;
	if (strcmp(signal_name, "SIGINT") == 0 \|\| strcmp(signal_name, "sigint") == 0) {
	signum = SIGINT;
	} else if (strcmp(signal_name, "SIGTERM") == 0 \|\| strcmp(signal_name, "sigterm") == 0) {
	signum = SIGTERM;
	} else if (strcmp(signal_name, "SIGHUP") == 0 \|\| strcmp(signal_name, "sighup") == 0) {
	signum = SIGHUP;
	} else if (strcmp(signal_name, "SIGUSR1") == 0 \|\| strcmp(signal_name, "sigusr1") == 0) {
	signum = SIGUSR1;
	} else if (strcmp(signal_name, "SIGUSR2") == 0 \|\| strcmp(signal_name, "sigusr2") == 0) {
	signum = SIGUSR2;
	} else {
	return js_mkerr(js, "unsupported signal: %s", signal_name);
	}

	signal_handlers[signum].js = js;
	signal_handlers[signum].handler = args[1];
	signal(signum, general_signal_handler);

	return js_mkundef();
	}

	static jsval_t js_require(struct js js, jsval_t args, int nargs) {
	if (nargs != 1) return js_mkundef();

	char data[8192];
	char *req_path = js_getstr(js, args[0], NULL);
	char full_path[PATH_MAX];

	jsval_t ant_obj = js_get(js, js_glob(js), "Ant");
	jsval_t dirname_val = js_get(js, ant_obj, "__dirname");
	char *base_path = js_getstr(js, dirname_val, NULL);

	if (base_path == NULL) base_path = ".";

	if (req_path[0] == '.') {
	snprintf(full_path, sizeof(full_path), "%s/%s", base_path, req_path);
	} else {
	snprintf(full_path, sizeof(full_path), "%s", req_path);
	}

	FILE *fp = fopen(full_path, "rb");
	if (fp == NULL) {
	fprintf(stderr, "Error: Could not open required file '%s'\n", full_path);
	return js_mkundef();
	}

	size_t len = fread(data, 1, sizeof(data), fp);
	fclose(fp);

	for (int i = 0; i < module_count; i++) {
	if (strcmp(module_cache[i].path, full_path) == 0) return module_cache[i].exports;
	}

	jsval_t module_exports = js_mkobj(js);
	jsval_t prev_exports = js_get(js, ant_obj, "exports");

	js_set(js, ant_obj, "exports", module_exports);
	js_mkscope(js);
	js_set_filename(js, full_path);

	jsval_t result = js_eval(js, data, len);
	js_delscope(js);

	if (js_type(result) == JS_ERR) {
	fprintf(stderr, "%s\n", js_str(js, result));
	return js_mkundef();
	}

	jsval_t final_exports = js_get(js, ant_obj, "exports");
	js_set(js, ant_obj, "exports", prev_exports);

	if (module_count >= module_capacity) {
	module_capacity = module_capacity == 0 ? 8 : module_capacity * 2;
	module_cache = realloc(module_cache, module_capacity * sizeof(*module_cache));
	if (module_cache == NULL) {
	fprintf(stderr, "Error: Failed to allocate module cache\n");
	return final_exports;
	}
	}

	module_cache[module_count].path = strdup(full_path);
	module_cache[module_count].exports = final_exports;
	module_count++;

	return final_exports;
	}

	static int execute_module(struct js js, const char filename) {
	char *filename_copy = strdup(filename);
	char *dir = dirname(filename_copy);

	jsval_t ant_obj = js_get(js, js_glob(js), "Ant");
	js_set(js, ant_obj, "__dirname", js_mkstr(js, dir, strlen(dir)));

	free(filename_copy);

	FILE *fp = fopen(filename, "rb");
	if (fp == NULL) {
	fprintf(stderr, "Error: Could not open file '%s'\n", filename);
	return EXIT_FAILURE;
	}

	fseek(fp, 0, SEEK_END);
	long file_size = ftell(fp);
	fseek(fp, 0, SEEK_SET);

	char *buffer = malloc(file_size + 1);
	if (buffer == NULL) {
	fprintf(stderr, "Error: Memory allocation failed\n");
	fclose(fp);
	return EXIT_FAILURE;
	}

	size_t len = fread(buffer, 1, file_size, fp);
	fclose(fp);
	buffer[len] = '\0';
	js_set_filename(js, filename);

	jsval_t result = js_eval(js, buffer, len);
	free(buffer);

	if (js_type(result) == JS_ERR) {
	fprintf(stderr, "%s\n", js_str(js, result));
	return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
	}

	int main(int argc, char *argv[]) {
	char dump = 0;
	static char mem[64 * 1024 * 1024]; // 64mb

	struct arg_lit *help = arg_lit0("h", "help", "display this help and exit");
	struct arg_lit *version = arg_lit0("v", "version", "display version information and exit");
	struct arg_lit *debug = arg_litn("d", "debug", 0, 10, "dump VM state (can be repeated for more detail)");
	struct arg_int *gct = arg_int0(NULL, "gct", "<threshold>", "set garbage collection threshold");
	struct arg_file *file = arg_file0(NULL, NULL, "<module.js>", "JavaScript module file to execute");
	struct arg_end *end = arg_end(20);

	void *argtable[] = {help, version, debug, gct, file, end};
	int nerrors = arg_parse(argc, argv, argtable);

	if (help->count > 0) {
	printf("Ant sized JavaScript\n\n");
	printf("Usage: ant");
	arg_print_syntax(stdout, argtable, "\n\n");
	arg_print_glossary(stdout, argtable, " %-25s %s\n");
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_SUCCESS;
	}

	if (version->count > 0) {
	printf("ant %s (%s %s) [release]\n", ANT_VERSION, ANT_BUILD_DATE, ANT_GIT_HASH);
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_SUCCESS;
	}

	if (nerrors > 0) {
	arg_print_errors(stdout, end, "ant");
	printf("Try 'ant --help' for more information.\n");
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_FAILURE;
	}

	if (file->count == 0) {
	fprintf(stderr, "Error: No input file specified\n");
	printf("Try 'ant --help' for more information.\n");
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_FAILURE;
	}

	const char *module_file = file->filename[0];
	dump = debug->count;

	struct js *js = js_create(mem, sizeof(mem));

	if (gct->count > 0) {
	js_setgct(js, gct->ival[0]);
	}

	jsval_t ant_obj = js_mkobj(js);
	js_set(js, js_glob(js), "Ant", ant_obj);

	js_set(js, ant_obj, "serve", js_mkfun(js_serve));
	js_set(js, ant_obj, "println", js_mkfun(js_println));
	js_set(js, ant_obj, "require", js_mkfun(js_require));
	js_set(js, ant_obj, "signal", js_mkfun(js_signal));

	jsval_t exports_obj = js_mkobj(js);
	js_set(js, ant_obj, "exports", exports_obj);

	int result = execute_module(js, module_file);
	if (dump) js_dump(js);

	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));

	return result;
	}

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