repl.c
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repl.c
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	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <ctype.h>
	#include <signal.h>
	#include <sys/stat.h>

	#ifdef _WIN32
	#include <conio.h>
	#include <windows.h>
	#include <io.h>
	#include <direct.h>
	#define STDIN_FILENO 0
	#define mkdir_p(path) _mkdir(path)
	#else
	#include <termios.h>
	#include <unistd.h>
	#define mkdir_p(path) mkdir(path, 0755)
	#endif

	#include "ant.h"
	#include "repl.h"
	#include "config.h"
	#include "runtime.h"
	#include "modules/io.h"

	#define MAX_HISTORY 512
	#define MAX_LINE_LENGTH 4096
	#define MAX_MULTILINE_LENGTH 65536
	#define INPUT char line, int pos, int len, key_event_t key, history_t hist, const char prompt

	static volatile sig_atomic_t ctrl_c_pressed = 0;

	typedef struct {
	char **lines;
	int count;
	int capacity;
	int current;
	} history_t;

	typedef enum {
	CMD_OK,
	CMD_EXIT,
	CMD_NOT_FOUND
	} cmd_result_t;

	typedef struct {
	const char *name;
	const char *description;
	bool has_arg;
	cmd_result_t (handler)(struct js js, history_t history, const char arg);
	} repl_command_t;

	static void sigint_handler(int sig) {
	(void)sig;
	ctrl_c_pressed++;
	}

	static cmd_result_t cmd_help(struct js js, history_t history, const char *arg);
	static cmd_result_t cmd_exit(struct js js, history_t history, const char *arg);
	static cmd_result_t cmd_clear(struct js js, history_t history, const char *arg);
	static cmd_result_t cmd_load(struct js js, history_t history, const char *arg);
	static cmd_result_t cmd_save(struct js js, history_t history, const char *arg);
	static cmd_result_t cmd_gc(struct js js, history_t history, const char *arg);
	static cmd_result_t cmd_stats(struct js js, history_t history, const char *arg);

	static const repl_command_t commands[] = {
	{ "help", "Show this help message", false, cmd_help },
	{ "exit", "Exit the REPL", false, cmd_exit },
	{ "clear", "Clear the current context", false, cmd_clear },
	{ "load", "Load JS from a file into the REPL session", true, cmd_load },
	{ "save", "Save all evaluated commands in this REPL session to a file", true, cmd_save },
	{ "gc", "Run garbage collector", false, cmd_gc },
	{ "stats", "Show memory statistics", false, cmd_stats },
	{ NULL, NULL, false, NULL }
	};

	static cmd_result_t cmd_help(struct js js, history_t history, const char *arg) {
	(void)js; (void)history; (void)arg;
	for (const repl_command_t *cmd = commands; cmd->name; cmd++) {
	printf(" .%-7s - %s\n", cmd->name, cmd->description);
	}
	printf("\nPress Ctrl+C to abort current expression.\n");
	return CMD_OK;
	}

	static cmd_result_t cmd_exit(struct js js, history_t history, const char *arg) {
	(void)js; (void)history; (void)arg;
	return CMD_EXIT;
	}

	static cmd_result_t cmd_clear(struct js js, history_t history, const char *arg) {
	(void)js; (void)history; (void)arg;
	printf("Clearing context...\n");
	return CMD_OK;
	}

	static cmd_result_t cmd_load(struct js js, history_t history, const char *arg) {
	(void)history;
	if (!arg \|\| *arg == '\0') {
	fprintf(stderr, "Usage: .load <filename>\n");
	return CMD_OK;
	}

	FILE *fp = fopen(arg, "r");
	if (fp == NULL) {
	fprintf(stderr, "Failed to open file: %s\n", arg);
	return CMD_OK;
	}

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

	char *file_buffer = malloc(file_size + 1);
	if (file_buffer) {
	size_t len = fread(file_buffer, 1, file_size, fp);
	file_buffer[len] = '\0';

	jsval_t result = js_eval(js, file_buffer, len);
	js_run_event_loop(js);
	if (js_type(result) == JS_ERR) {
	fprintf(stderr, "%s\n", js_str(js, result));
	} else if (js_type(result) != JS_UNDEF) {
	printf("%s\n", js_str(js, result));
	}

	free(file_buffer);
	}
	fclose(fp);
	return CMD_OK;
	}

	static cmd_result_t cmd_save(struct js js, history_t history, const char *arg) {
	(void)js;
	if (!arg \|\| *arg == '\0') {
	fprintf(stderr, "Usage: .save <filename>\n");
	return CMD_OK;
	}

	FILE *fp = fopen(arg, "w");
	if (fp == NULL) {
	fprintf(stderr, "Failed to open file for writing: %s\n", arg);
	return CMD_OK;
	}

	for (int i = 0; i < history->count; i++) {
	fprintf(fp, "%s\n", history->lines[i]);
	}
	fclose(fp);
	printf("Session saved to %s\n", arg);
	return CMD_OK;
	}

	static cmd_result_t cmd_gc(struct js js, history_t history, const char *arg) {
	jsval_t gc_fn = js_get(js, rt->ant_obj, "gc");
	jsval_t result = js_call(js, gc_fn, NULL, 0);
	console_print(js, &result, 1, NULL, stdout);
	return CMD_OK;
	}

	static cmd_result_t cmd_stats(struct js js, history_t history, const char *arg) {
	jsval_t stats_fn = js_get(js, rt->ant_obj, "stats");
	jsval_t result = js_call(js, stats_fn, NULL, 0);
	console_print(js, &result, 1, NULL, stdout);
	return CMD_OK;
	}

	static cmd_result_t execute_command(struct js js, history_t history, const char *line) {
	const char *cmd_start = line + 1;

	for (const repl_command_t *cmd = commands; cmd->name; cmd++) {
	size_t n = strlen(cmd->name);
	if (strncmp(cmd_start, cmd->name, n) != 0) continue;

	char next = cmd_start[n];
	if (cmd->has_arg && (next == ' ' \|\| next == '\0')) {
	const char *arg = cmd_start + n;
	while (*arg == ' ') arg++;
	return cmd->handler(js, history, arg);
	}
	if (!cmd->has_arg && next == '\0') return cmd->handler(js, history, NULL);
	}

	return CMD_NOT_FOUND;
	}

	static void history_init(history_t *hist) {
	hist->capacity = MAX_HISTORY;
	hist->lines = malloc(sizeof(char) hist->capacity);
	hist->count = 0;
	hist->current = -1;
	}

	static void history_add(history_t hist, const char line) {
	if (strlen(line) == 0) return;
	if (hist->count > 0 && strcmp(hist->lines[hist->count - 1], line) == 0) return;

	if (hist->count >= hist->capacity) {
	free(hist->lines[0]);
	memmove(hist->lines, hist->lines + 1, sizeof(char) (hist->capacity - 1));
	hist->count--;
	}

	hist->lines[hist->count++] = strdup(line);
	hist->current = hist->count;
	}

	static const char* history_prev(history_t *hist) {
	if (hist->count == 0) return NULL;
	if (hist->current > 0) hist->current--;
	return hist->lines[hist->current];
	}

	static const char* history_next(history_t *hist) {
	if (hist->count == 0) return NULL;
	if (hist->current < hist->count - 1) {
	hist->current++;
	return hist->lines[hist->current];
	}
	hist->current = hist->count;
	return "";
	}

	static void history_free(history_t *hist) {
	for (int i = 0; i < hist->count; i++) free(hist->lines[i]);
	free(hist->lines);
	}

	static char* get_history_path(void) {
	const char *home = getenv("HOME");
	if (!home) home = getenv("USERPROFILE");
	if (!home) return NULL;

	size_t len = strlen(home) + 32;
	char *path = malloc(len);
	snprintf(path, len, "%s/.ant", home);
	mkdir_p(path);
	snprintf(path, len, "%s/.ant/repl_history", home);
	return path;
	}

	static void history_load(history_t *hist) {
	char *path = get_history_path();
	if (!path) return;

	FILE *fp = fopen(path, "r");
	free(path);
	if (!fp) return;

	char line[MAX_LINE_LENGTH];
	while (fgets(line, sizeof(line), fp)) {
	size_t len = strlen(line);
	if (len > 0 && line[len - 1] == '\n') line[len - 1] = '\0';
	if (line[0]) history_add(hist, line);
	}
	fclose(fp);
	}

	static void history_save(history_t *hist) {
	char *path = get_history_path();
	if (!path) return;

	FILE *fp = fopen(path, "w");
	free(path);
	if (!fp) return;

	for (int i = 0; i < hist->count; i++) {
	fprintf(fp, "%s\n", hist->lines[i]);
	}
	fclose(fp);
	}

	typedef enum {
	KEY_NONE, KEY_UP, KEY_DOWN, KEY_LEFT, KEY_RIGHT,
	KEY_BACKSPACE, KEY_ENTER, KEY_EOF, KEY_CHAR
	} key_type_t;

	typedef struct { key_type_t type; int ch; } key_event_t;
	typedef void (*key_handler_t)(INPUT);

	static void cursor_move(int *pos, int len, int dir) {
	if (dir < 0 && pos > 0) { printf("\033[D"); fflush(stdout); (pos)--; }
	else if (dir > 0 && pos < len) { printf("\033[C"); fflush(stdout); (pos)++; }
	}

	static void line_set(char line, int pos, int len, const char str, const char *prompt) {
	printf("\r\033[K%s%s", prompt, str);
	fflush(stdout); strcpy(line, str);
	len = strlen(line); pos = *len;
	}

	static void line_backspace(char line, int pos, int *len) {
	if (*pos <= 0) return;

	memmove(line + pos - 1, line + pos, len - pos + 1);
	(pos)--; (len)--;
	printf("\b\033[K%s", line + *pos);
	for (int i = 0; i < len - pos; i++) printf("\033[D");
	fflush(stdout);
	}

	static void line_insert(char line, int pos, int *len, int c) {
	if (*len >= MAX_LINE_LENGTH - 1) return;

	memmove(line + pos + 1, line + pos, len - pos + 1);
	line[*pos] = c;
	(pos)++; (len)++;
	printf("%c%s", c, line + *pos);
	for (int i = 0; i < len - pos; i++) printf("\033[D");
	fflush(stdout);
	}

	#ifdef _WIN32
	static key_event_t read_key(void) {
	if (ctrl_c_pressed > 0) return (key_event_t){ KEY_EOF, 0 };
	int c = _getch();
	if (c == 0 \|\| c == 0xE0) {
	int ext = _getch();
	switch (ext) {
	case 72: return (key_event_t){ KEY_UP, 0 };
	case 80: return (key_event_t){ KEY_DOWN, 0 };
	case 77: return (key_event_t){ KEY_RIGHT, 0 };
	case 75: return (key_event_t){ KEY_LEFT, 0 };
	}
	return (key_event_t){ KEY_NONE, 0 };
	}
	if (c == 8) return (key_event_t){ KEY_BACKSPACE, 0 };
	if (c == '\r' \|\| c == '\n') return (key_event_t){ KEY_ENTER, 0 };
	if (c == 3) { ctrl_c_pressed++; return (key_event_t){ KEY_EOF, 0 }; }
	if (c == 4 \|\| c == 26) return (key_event_t){ KEY_EOF, 0 };
	if (isprint(c)) return (key_event_t){ KEY_CHAR, c };
	return (key_event_t){ KEY_NONE, 0 };
	}
	#define TERM_INIT()
	#define TERM_RESTORE()
	#else
	static struct termios saved_tio;
	static key_event_t read_key(void) {
	if (ctrl_c_pressed > 0) return (key_event_t){ KEY_EOF, 0 };
	int c = getchar();
	if (c == EOF && !feof(stdin)) { clearerr(stdin); return (key_event_t){ KEY_EOF, 0 }; }
	if (c == EOF) return (key_event_t){ KEY_EOF, 0 };
	if (c == 27) {
	if (getchar() == '[') {
	switch (getchar()) {
	case 'A': return (key_event_t){ KEY_UP, 0 };
	case 'B': return (key_event_t){ KEY_DOWN, 0 };
	case 'C': return (key_event_t){ KEY_RIGHT, 0 };
	case 'D': return (key_event_t){ KEY_LEFT, 0 };
	}
	}
	return (key_event_t){ KEY_NONE, 0 };
	}
	if (c == 127 \|\| c == 8) return (key_event_t){ KEY_BACKSPACE, 0 };
	if (c == '\n' \|\| c == '\r') return (key_event_t){ KEY_ENTER, 0 };
	if (isprint(c)) return (key_event_t){ KEY_CHAR, c };
	return (key_event_t){ KEY_NONE, 0 };
	}
	#define TERM_INIT() do { \
	struct termios new_tio; \
	tcgetattr(STDIN_FILENO, &saved_tio); \
	new_tio = saved_tio; \
	new_tio.c_lflag &= ~(ICANON \| ECHO); \
	tcsetattr(STDIN_FILENO, TCSANOW, &new_tio); \
	} while(0)
	#define TERM_RESTORE() tcsetattr(STDIN_FILENO, TCSANOW, &saved_tio)
	#endif

	static void handle_up(INPUT) {
	const char *h = history_prev(hist);
	if (h) line_set(line, pos, len, h, prompt);
	}

	static void handle_down(INPUT) {
	const char *h = history_next(hist);
	if (h) line_set(line, pos, len, h, prompt);
	}

	static void handle_left(INPUT) { cursor_move(pos, *len, -1); }
	static void handle_right(INPUT) { cursor_move(pos, *len, 1); }
	static void handle_backspace(INPUT) { line_backspace(line, pos, len); }
	static void handle_char(INPUT) { line_insert(line, pos, len, key->ch); }

	static key_handler_t handlers[] = {
	[KEY_UP] = handle_up, [KEY_DOWN] = handle_down,
	[KEY_LEFT] = handle_left, [KEY_RIGHT] = handle_right,
	[KEY_BACKSPACE] = handle_backspace, [KEY_CHAR] = handle_char,
	};

	static char* read_line_with_history(history_t hist, struct js js, const char *prompt) {
	char *line = malloc(MAX_LINE_LENGTH);
	int pos = 0, len = 0; line[0] = '\0';

	TERM_INIT();

	do {
	key_event_t key = read_key();

	if (key.type == KEY_ENTER) {
	printf("\n"); fflush(stdout);
	TERM_RESTORE(); return line;
	}

	if (key.type == KEY_EOF) {
	printf("\n"); fflush(stdout);
	TERM_RESTORE();
	free(line); return NULL;
	}

	if (handlers[key.type]) {
	handlers[key.type](line, &pos, &len, &key, hist, prompt);
	}
	} while (1);
	}

	static bool is_incomplete_input(const char *code, size_t len) {
	int paren_depth = 0;
	int bracket_depth = 0;
	int brace_depth = 0;

	bool in_string = false;
	bool in_template = false;
	char string_char = 0;
	bool escape_next = false;

	for (size_t i = 0; i < len; i++) {
	char c = code[i];

	if (escape_next) {
	escape_next = false;
	continue;
	}

	if (c == '\\' && (in_string \|\| in_template)) {
	escape_next = true;
	continue;
	}

	if (in_string) {
	if (c == string_char) in_string = false;
	continue;
	}

	if (in_template) {
	if (c == '`') {
	in_template = false;
	} else if (c == '$' && i + 1 < len && code[i + 1] == '{') {
	brace_depth++; i++;
	}
	continue;
	}

	if (c == '/' && i + 1 < len && code[i + 1] == '/') {
	while (i < len && code[i] != '\n') i++;
	continue;
	}

	if (c == '/' && i + 1 < len && code[i + 1] == '*') {
	i += 2;
	while (i + 1 < len && !(code[i] == '*' && code[i + 1] == '/')) i++;
	if (i + 1 >= len) return true;
	i++; continue;
	}

	switch (c) {
	case '"':
	case '\'':
	in_string = true;
	string_char = c;
	break;
	case '`':
	in_template = true;
	break;
	case '(': paren_depth++; break;
	case ')': paren_depth--; break;
	case '[': bracket_depth++; break;
	case ']': bracket_depth--; break;
	case '{': brace_depth++; break;
	case '}': brace_depth--; break;
	}
	}

	return in_string \|\| in_template \|\| paren_depth > 0 \|\| bracket_depth > 0 \|\| brace_depth > 0;
	}

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

	js_set_filename(js, "[repl]");
	js_setup_import_meta(js, "[repl]");
	js_mkscope(js);

	printf("Welcome to Ant JavaScript v%s\n", ANT_VERSION);
	printf("Type \".help\" for more information.\n");

	#ifdef _WIN32
	signal(SIGINT, sigint_handler);
	#else
	struct sigaction sa;
	sa.sa_handler = sigint_handler;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;
	sigaction(SIGINT, &sa, NULL);
	#endif

	history_t history;
	history_init(&history);
	history_load(&history);

	js_set(js, js_glob(js), "__dirname", js_mkstr(js, ".", 1));
	js_set(js, js_glob(js), "__filename", js_mkstr(js, "[repl]", 6));

	int prev_ctrl_c_count = 0;
	char *multiline_buf = NULL;
	size_t multiline_len = 0;
	size_t multiline_cap = 0;

	while (1) {
	const char *prompt = multiline_buf ? "\| " : "> ";
	printf("%s", prompt);
	fflush(stdout);

	ctrl_c_pressed = 0;
	char *line = read_line_with_history(&history, js, prompt);

	if (ctrl_c_pressed > 0) {
	if (multiline_buf) {
	free(multiline_buf);
	multiline_buf = NULL;
	multiline_len = 0;
	multiline_cap = 0;
	prev_ctrl_c_count = 0;
	if (line) free(line);
	continue;
	}
	if (prev_ctrl_c_count > 0) {
	if (line) free(line);
	break;
	}
	printf("(To exit, press Ctrl+C again or type .exit)\n");
	prev_ctrl_c_count++;
	if (line) free(line);
	continue;
	}

	if (line == NULL) {
	if (multiline_buf) {
	free(multiline_buf);
	multiline_buf = NULL;
	multiline_len = 0;
	multiline_cap = 0;
	continue;
	}
	break;
	}

	prev_ctrl_c_count = 0;
	size_t line_len = strlen(line);

	if (line_len == 0 && multiline_buf) {
	if (multiline_len + 1 >= multiline_cap) {
	multiline_cap = multiline_cap ? multiline_cap * 2 : 256;
	multiline_buf = realloc(multiline_buf, multiline_cap);
	}
	multiline_buf[multiline_len++] = '\n';
	multiline_buf[multiline_len] = '\0';
	free(line);
	continue;
	}

	if (line_len == 0) {
	free(line);
	continue;
	}

	if (!multiline_buf && line[0] == '.') {
	cmd_result_t result = execute_command(js, &history, line);
	if (result == CMD_EXIT) {
	free(line);
	break;
	} else if (result == CMD_NOT_FOUND) {
	printf("Unknown command: %s\n", line);
	printf("Type \".help\" for more information.\n");
	}
	free(line);
	continue;
	}

	size_t new_len = multiline_len + line_len + 1;
	if (new_len >= multiline_cap \|\| !multiline_buf) {
	multiline_cap = multiline_cap ? multiline_cap * 2 : 256;
	if (multiline_cap < new_len + 1) multiline_cap = new_len + 1;
	multiline_buf = realloc(multiline_buf, multiline_cap);
	}

	if (multiline_len > 0) {
	multiline_buf[multiline_len++] = '\n';
	}
	memcpy(multiline_buf + multiline_len, line, line_len);
	multiline_len += line_len;
	multiline_buf[multiline_len] = '\0';

	free(line);

	if (is_incomplete_input(multiline_buf, multiline_len)) continue;
	history_add(&history, multiline_buf);

	jsval_t eval_result = js_eval(js, multiline_buf, multiline_len);
	js_run_event_loop(js);

	if (js_type(eval_result) == JS_ERR) {
	fprintf(stderr, "%s\n", js_str(js, eval_result));
	} else {
	const char *str = js_str(js, eval_result);
	print_value_colored(str, stdout);
	printf("\n");
	}

	free(multiline_buf);
	multiline_buf = NULL;
	multiline_len = 0;
	multiline_cap = 0;
	}

	if (multiline_buf) free(multiline_buf);
	history_save(&history);
	history_free(&history);
	}

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