readline.c
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readline.c
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	#include <compat.h> // IWYU pragma: keep

	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <stdbool.h>
	#include <ctype.h>
	#include <uthash.h>
	#include <uv.h>

	#ifdef _WIN32
	#include <conio.h>
	#include <windows.h>
	#include <io.h>
	#define STDIN_FILENO 0
	#define STDOUT_FILENO 1
	#else
	#include <termios.h>
	#include <unistd.h>
	#include <sys/select.h>
	#include <sys/ioctl.h>
	#endif

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

	#define MAX_LINE_LENGTH 4096
	#define MAX_HISTORY 1000
	#define DEFAULT_PROMPT "> "
	#define DEFAULT_HISTORY_SIZE 30
	#define DEFAULT_TAB_SIZE 8
	#define MAX_INTERFACES 64

	typedef struct {
	jsval_t listener;
	bool once;
	} RLEventListener;

	#define MAX_LISTENERS_PER_EVENT 16

	typedef struct {
	char *event_type;
	RLEventListener listeners[MAX_LISTENERS_PER_EVENT];
	int listener_count;
	UT_hash_handle hh;
	} RLEventType;

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

	typedef struct rl_interface {
	uint64_t id;
	jsval_t input_stream;
	jsval_t output_stream;
	jsval_t completer;
	jsval_t js_obj;
	char *prompt;
	char *line_buffer;
	int line_pos;
	int line_len;
	rl_history_t history;
	bool terminal;
	bool paused;
	bool closed;
	bool reading;
	int history_size;
	bool remove_history_duplicates;
	int crlf_delay;
	int escape_code_timeout;
	int tab_size;
	jsval_t pending_question_resolve;
	jsval_t pending_question_reject;
	RLEventType *events;
	uv_tty_t tty_in;
	uv_tty_t tty_out;
	bool tty_initialized;
	int escape_state;
	char escape_buf[16];
	int escape_len;
	UT_hash_handle hh;
	#ifndef _WIN32
	struct termios saved_termios;
	bool raw_mode;
	#endif
	} rl_interface_t;

	static rl_interface_t *interfaces = NULL;
	static uint64_t next_interface_id = 1;

	static void rl_history_init(rl_history_t *hist, int capacity) {
	hist->capacity = capacity > 0 ? capacity : DEFAULT_HISTORY_SIZE;
	hist->lines = calloc(hist->capacity, sizeof(char*));
	hist->count = 0;
	hist->current = -1;
	}

	static void rl_history_add(rl_history_t hist, const char line, bool remove_duplicates) {
	if (!line \|\| strlen(line) == 0) return;

	if (remove_duplicates) {
	for (int i = 0; i < hist->count; i++) {
	if (strcmp(hist->lines[i], line) == 0) {
	free(hist->lines[i]);
	for (int j = i; j < hist->count - 1; j++) {
	hist->lines[j] = hist->lines[j + 1];
	}
	hist->count--; break;
	}
	}
	} else 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 rl_history_prev(rl_history_t hist) {
	if (hist->count == 0) return NULL;
	if (hist->current > 0) hist->current--;
	return hist->lines[hist->current];
	}

	static const char rl_history_next(rl_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 rl_history_free(rl_history_t *hist) {
	if (hist->lines) {
	for (int i = 0; i < hist->count; i++) {
	free(hist->lines[i]);
	}
	free(hist->lines);
	hist->lines = NULL;
	}
	hist->count = 0;
	hist->current = -1;
	}

	static RLEventType find_or_create_event_type(rl_interface_t iface, const char *event_type) {
	RLEventType *evt = NULL;
	HASH_FIND_STR(iface->events, event_type, evt);

	if (evt == NULL) {
	evt = malloc(sizeof(RLEventType));
	evt->event_type = strdup(event_type);
	evt->listener_count = 0;
	HASH_ADD_KEYPTR(hh, iface->events, evt->event_type, strlen(evt->event_type), evt);
	}

	return evt;
	}

	static void emit_event(struct js js, rl_interface_t iface, const char event_type, jsval_t args, int nargs) {
	RLEventType *evt = NULL;
	HASH_FIND_STR(iface->events, event_type, evt);

	if (evt == NULL \|\| evt->listener_count == 0) return;

	int i = 0;
	while (i < evt->listener_count) {
	RLEventListener *listener = &evt->listeners[i];
	js_call(js, listener->listener, args, nargs);

	if (listener->once) {
	for (int j = i; j < evt->listener_count - 1; j++) {
	evt->listeners[j] = evt->listeners[j + 1];
	}
	evt->listener_count--;
	} else i++;
	}
	}

	static jsval_t get_history_array(struct js js, rl_interface_t iface) {
	jsval_t arr = js_mkarr(js);
	for (int i = 0; i < iface->history.count; i++) {
	js_arr_push(js, arr, js_mkstr(js, iface->history.lines[i], strlen(iface->history.lines[i])));
	}
	return arr;
	}

	static void emit_history_event(struct js js, rl_interface_t iface) {
	jsval_t history_arr = get_history_array(js, iface);
	emit_event(js, iface, "history", &history_arr, 1);
	}

	#ifndef _WIN32
	static void enter_raw_mode(rl_interface_t *iface) {
	if (iface->raw_mode) return;

	struct termios raw;
	if (tcgetattr(STDIN_FILENO, &iface->saved_termios) == -1) return;

	raw = iface->saved_termios;
	raw.c_lflag &= ~(ICANON \| ECHO \| ISIG);
	raw.c_cc[VMIN] = 1;
	raw.c_cc[VTIME] = 0;

	if (tcsetattr(STDIN_FILENO, TCSANOW, &raw) == -1) return;
	iface->raw_mode = true;
	}

	static void exit_raw_mode(rl_interface_t *iface) {
	if (!iface->raw_mode) return;
	tcsetattr(STDIN_FILENO, TCSANOW, &iface->saved_termios);
	iface->raw_mode = false;
	}
	#endif

	static void write_output(rl_interface_t iface, const char str) {
	(void)iface;
	printf("%s", str);
	fflush(stdout);
	}

	static void clear_line_display(rl_interface_t *iface) {
	write_output(iface, "\r\033[K");
	}

	static void refresh_line(rl_interface_t *iface) {
	char buf[MAX_LINE_LENGTH + 256];
	snprintf(buf, sizeof(buf), "\r\033[K%s%s", iface->prompt, iface->line_buffer);
	write_output(iface, buf);

	int cursor_offset = iface->line_len - iface->line_pos;
	if (cursor_offset > 0) {
	char move_buf[32];
	snprintf(move_buf, sizeof(move_buf), "\033[%dD", cursor_offset);
	write_output(iface, move_buf);
	}
	}

	static rl_interface_t *find_interface_by_id(uint64_t id) {
	rl_interface_t *iface = NULL;
	HASH_FIND(hh, interfaces, &id, sizeof(uint64_t), iface);
	return iface;
	}

	static void handle_history_up(rl_interface_t *iface) {
	const char *hist_line = rl_history_prev(&iface->history);
	if (hist_line) {
	strcpy(iface->line_buffer, hist_line);
	iface->line_len = strlen(iface->line_buffer);
	iface->line_pos = iface->line_len;
	refresh_line(iface);
	}
	}

	static void handle_history_down(rl_interface_t *iface) {
	const char *hist_line = rl_history_next(&iface->history);
	if (hist_line) {
	strcpy(iface->line_buffer, hist_line);
	iface->line_len = strlen(iface->line_buffer);
	iface->line_pos = iface->line_len;
	refresh_line(iface);
	}
	}

	static void handle_char_input(rl_interface_t *iface, char c) {
	if (iface->line_len < MAX_LINE_LENGTH - 1) {
	memmove(iface->line_buffer + iface->line_pos + 1,
	iface->line_buffer + iface->line_pos,
	iface->line_len - iface->line_pos + 1);
	iface->line_buffer[iface->line_pos] = c;
	iface->line_pos++;
	iface->line_len++;

	if (iface->line_pos == iface->line_len) {
	printf("%c", c);
	fflush(stdout);
	} else {
	refresh_line(iface);
	}
	}
	}

	static void handle_backspace(rl_interface_t *iface) {
	if (iface->line_pos > 0) {
	memmove(
	iface->line_buffer + iface->line_pos - 1,
	iface->line_buffer + iface->line_pos,
	iface->line_len - iface->line_pos + 1
	);
	iface->line_pos--;
	iface->line_len--;
	refresh_line(iface);
	}
	}

	static void handle_delete(rl_interface_t *iface) {
	if (iface->line_pos < iface->line_len) {
	memmove(
	iface->line_buffer + iface->line_pos,
	iface->line_buffer + iface->line_pos + 1,
	iface->line_len - iface->line_pos
	);
	iface->line_len--;
	refresh_line(iface);
	}
	}

	static void handle_escape_sequence(rl_interface_t iface, const char seq, int len) {
	if (len >= 2 && seq[0] == '[') {
	switch (seq[1]) {
	case 'A': handle_history_up(iface); break;
	case 'B': handle_history_down(iface); break;
	case 'C':
	if (iface->line_pos < iface->line_len) {
	iface->line_pos++;
	printf("\033[C");
	fflush(stdout);
	}
	break;
	case 'D':
	if (iface->line_pos > 0) {
	iface->line_pos--;
	printf("\033[D");
	fflush(stdout);
	}
	break;
	case 'H':
	iface->line_pos = 0;
	refresh_line(iface);
	break;
	case 'F':
	iface->line_pos = iface->line_len;
	refresh_line(iface);
	break;
	case '3':
	if (len >= 3 && seq[2] == '~') {
	handle_delete(iface);
	}
	break;
	}
	}
	}

	static void alloc_buffer(uv_handle_t handle, size_t suggested_size, uv_buf_t buf) {
	(void)handle;
	buf->base = malloc(suggested_size);
	buf->len = suggested_size;
	}

	static void on_stdin_read(uv_stream_t stream, ssize_t nread, const uv_buf_t buf) {
	rl_interface_t iface = (rl_interface_t )stream->data;
	struct js *js = rt->js;

	if (!iface \|\| iface->closed \|\| iface->paused) {
	if (buf->base) free(buf->base);
	return;
	}

	if (nread < 0) {
	if (nread == UV_EOF) {
	emit_event(js, iface, "close", NULL, 0);
	iface->closed = true;
	}
	if (buf->base) free(buf->base);
	return;
	}

	for (ssize_t i = 0; i < nread; i++) {
	char c = buf->base[i];

	if (iface->escape_state > 0) {
	iface->escape_buf[iface->escape_len++] = c;

	if (iface->escape_state == 1) {
	if (c == '[' \|\| c == 'O') {
	iface->escape_state = 2;
	} else {
	iface->escape_state = 0;
	iface->escape_len = 0;
	}
	} else if (iface->escape_state == 2) {
	if ((c >= 'A' && c <= 'Z') \|\| c == '~') {
	handle_escape_sequence(iface, iface->escape_buf, iface->escape_len);
	iface->escape_state = 0;
	iface->escape_len = 0;
	} else if (iface->escape_len >= 15) {
	iface->escape_state = 0;
	iface->escape_len = 0;
	}
	}
	continue;
	}

	if (c == 27) {
	iface->escape_state = 1;
	iface->escape_len = 0;
	continue;
	}

	if (c == '\r' \|\| c == '\n') {
	printf("\n");
	fflush(stdout);

	char *line = strdup(iface->line_buffer);
	rl_history_add(&iface->history, line, iface->remove_history_duplicates);
	emit_history_event(js, iface);

	jsval_t line_val = js_mkstr(js, line, strlen(line));
	emit_event(js, iface, "line", &line_val, 1);

	if (js_type(iface->pending_question_resolve) == JS_FUNC) {
	js_call(js, iface->pending_question_resolve, &line_val, 1);
	iface->pending_question_resolve = js_mkundef();
	iface->pending_question_reject = js_mkundef();
	}

	iface->line_buffer[0] = '\0';
	iface->line_pos = 0;
	iface->line_len = 0;
	iface->history.current = iface->history.count;

	free(line);
	} else if (c == 127 \|\| c == 8) {
	handle_backspace(iface);
	} else if (c == 3) {
	emit_event(js, iface, "SIGINT", NULL, 0);
	} else if (c == 4) {
	if (iface->line_len == 0) {
	emit_event(js, iface, "close", NULL, 0);
	iface->closed = true;
	uv_read_stop(stream);
	} else {
	handle_delete(iface);
	}
	} else if (c == 1) {
	iface->line_pos = 0;
	refresh_line(iface);
	} else if (c == 5) {
	iface->line_pos = iface->line_len;
	refresh_line(iface);
	} else if (c == 11) {
	iface->line_buffer[iface->line_pos] = '\0';
	iface->line_len = iface->line_pos;
	refresh_line(iface);
	} else if (c == 21) {
	iface->line_buffer[0] = '\0';
	iface->line_pos = 0;
	iface->line_len = 0;
	refresh_line(iface);
	} else if (c == 12) {
	printf("\033[2J\033[H");
	refresh_line(iface);
	} else if (c >= 32 && c < 127) {
	handle_char_input(iface, c);
	}
	}

	if (buf->base) free(buf->base);
	}

	static void start_reading(rl_interface_t *iface) {
	if (iface->reading \|\| iface->closed) return;

	if (!iface->tty_initialized) {
	uv_loop_t *loop = uv_default_loop();

	int is_tty = uv_guess_handle(STDIN_FILENO) == UV_TTY;

	if (is_tty) {
	if (uv_tty_init(loop, &iface->tty_in, STDIN_FILENO, 1) != 0) {
	return;
	}
	uv_tty_set_mode(&iface->tty_in, UV_TTY_MODE_RAW);
	} else {
	if (uv_tty_init(loop, &iface->tty_in, STDIN_FILENO, 1) != 0) {
	return;
	}
	}

	iface->tty_in.data = iface;
	iface->tty_initialized = true;
	}

	iface->reading = true;
	uv_read_start((uv_stream_t *)&iface->tty_in, alloc_buffer, on_stdin_read);
	}

	static void stop_reading(rl_interface_t *iface) {
	if (!iface->reading) return;

	uv_read_stop((uv_stream_t *)&iface->tty_in);
	iface->reading = false;
	}

	static void process_line(struct js js, rl_interface_t iface) {
	char *line = strdup(iface->line_buffer);

	rl_history_add(&iface->history, line, iface->remove_history_duplicates);
	emit_history_event(js, iface);

	jsval_t line_val = js_mkstr(js, line, strlen(line));
	emit_event(js, iface, "line", &line_val, 1);

	if (js_type(iface->pending_question_resolve) == JS_FUNC) {
	js_call(js, iface->pending_question_resolve, &line_val, 1);
	iface->pending_question_resolve = js_mkundef();
	iface->pending_question_reject = js_mkundef();
	}

	iface->line_buffer[0] = '\0';
	iface->line_pos = 0;
	iface->line_len = 0;

	free(line);
	}

	static rl_interface_t get_interface(struct js js, jsval_t this_obj) {
	jsval_t id_val = js_get(js, this_obj, "_rl_id");
	if (js_type(id_val) != JS_NUM) return NULL;

	uint64_t id = (uint64_t)js_getnum(id_val);
	rl_interface_t *iface = NULL;
	HASH_FIND(hh, interfaces, &id, sizeof(uint64_t), iface);
	return iface;
	}

	static jsval_t rl_interface_on(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");
	if (nargs < 2) return js_mkerr(js, "on requires 2 arguments");

	char *event = js_getstr(js, args[0], NULL);
	if (!event) return js_mkerr(js, "event must be a string");
	if (js_type(args[1]) != JS_FUNC) return js_mkerr(js, "listener must be a function");

	RLEventType *evt = find_or_create_event_type(iface, event);
	if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
	return js_mkerr(js, "maximum listeners reached");
	}

	evt->listeners[evt->listener_count].listener = args[1];
	evt->listeners[evt->listener_count].once = false;
	evt->listener_count++;

	return this_obj;
	}

	static jsval_t rl_interface_once(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");
	if (nargs < 2) return js_mkerr(js, "once requires 2 arguments");

	char *event = js_getstr(js, args[0], NULL);
	if (!event) return js_mkerr(js, "event must be a string");
	if (js_type(args[1]) != JS_FUNC) return js_mkerr(js, "listener must be a function");

	RLEventType *evt = find_or_create_event_type(iface, event);
	if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
	return js_mkerr(js, "maximum listeners reached");
	}

	evt->listeners[evt->listener_count].listener = args[1];
	evt->listeners[evt->listener_count].once = true;
	evt->listener_count++;

	return this_obj;
	}

	static jsval_t rl_interface_off(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");
	if (nargs < 2) return this_obj;

	char *event = js_getstr(js, args[0], NULL);
	if (!event) return this_obj;

	RLEventType *evt = NULL;
	HASH_FIND_STR(iface->events, event, evt);
	if (!evt) return this_obj;

	for (int i = 0; i < evt->listener_count; i++) {
	if (evt->listeners[i].listener == args[1]) {
	for (int j = i; j < evt->listener_count - 1; j++) {
	evt->listeners[j] = evt->listeners[j + 1];
	}
	evt->listener_count--;
	break;
	}
	}

	return this_obj;
	}

	static jsval_t rl_interface_emit(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");
	if (nargs < 1) return js_mkfalse();

	char *event = js_getstr(js, args[0], NULL);
	if (!event) return js_mkfalse();

	emit_event(js, iface, event, nargs > 1 ? &args[1] : NULL, nargs - 1);
	return js_mktrue();
	}

	static jsval_t rl_interface_close(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface \|\| iface->closed) return js_mkundef();

	stop_reading(iface);

	if (iface->tty_initialized) {
	uv_tty_reset_mode();
	uv_close((uv_handle_t *)&iface->tty_in, NULL);
	iface->tty_initialized = false;
	}

	#ifndef _WIN32
	exit_raw_mode(iface);
	#endif

	iface->closed = true;
	emit_event(js, iface, "close", NULL, 0);

	return js_mkundef();
	}

	static jsval_t rl_interface_pause(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");

	if (!iface->paused) {
	iface->paused = true;
	stop_reading(iface);
	emit_event(js, iface, "pause", NULL, 0);
	}

	return this_obj;
	}

	static jsval_t rl_interface_resume(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");

	if (iface->paused) {
	iface->paused = false;
	start_reading(iface);
	emit_event(js, iface, "resume", NULL, 0);
	}

	return this_obj;
	}

	static jsval_t rl_interface_prompt(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface \|\| iface->closed) return js_mkundef();

	if (iface->paused) {
	iface->paused = false;
	emit_event(js, iface, "resume", NULL, 0);
	}

	bool preserve_cursor = false;
	if (nargs > 0) preserve_cursor = js_truthy(js, args[0]);

	if (!preserve_cursor) {
	iface->line_buffer[0] = '\0';
	iface->line_pos = 0;
	iface->line_len = 0;
	}

	write_output(iface, iface->prompt);
	if (iface->line_len > 0) {
	write_output(iface, iface->line_buffer);
	}

	start_reading(iface);

	return js_mkundef();
	}

	static jsval_t rl_interface_set_prompt(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");
	if (nargs < 1) return js_mkundef();

	char *new_prompt = js_getstr(js, args[0], NULL);
	if (new_prompt) {
	free(iface->prompt);
	iface->prompt = strdup(new_prompt);
	}

	return js_mkundef();
	}

	static jsval_t rl_interface_get_prompt(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");

	return js_mkstr(js, iface->prompt, strlen(iface->prompt));
	}

	static void process_key_sequence(rl_interface_t iface, const char name, bool ctrl, bool meta, bool shift) {
	(void)meta; (void)shift;

	if (!name) return;

	if (strcmp(name, "return") == 0 \|\| strcmp(name, "enter") == 0) {
	printf("\n");
	fflush(stdout);
	} else if (strcmp(name, "backspace") == 0) {
	if (iface->line_pos > 0) {
	memmove(iface->line_buffer + iface->line_pos - 1,
	iface->line_buffer + iface->line_pos,
	iface->line_len - iface->line_pos + 1);
	iface->line_pos--;
	iface->line_len--;
	}
	} else if (strcmp(name, "delete") == 0) {
	if (iface->line_pos < iface->line_len) {
	memmove(iface->line_buffer + iface->line_pos,
	iface->line_buffer + iface->line_pos + 1,
	iface->line_len - iface->line_pos);
	iface->line_len--;
	}
	} else if (strcmp(name, "left") == 0) {
	if (iface->line_pos > 0) iface->line_pos--;
	} else if (strcmp(name, "right") == 0) {
	if (iface->line_pos < iface->line_len) iface->line_pos++;
	} else if (strcmp(name, "home") == 0 \|\| (ctrl && strcmp(name, "a") == 0)) {
	iface->line_pos = 0;
	} else if (strcmp(name, "end") == 0 \|\| (ctrl && strcmp(name, "e") == 0)) {
	iface->line_pos = iface->line_len;
	} else if (ctrl && strcmp(name, "u") == 0) {
	iface->line_buffer[0] = '\0';
	iface->line_pos = 0;
	iface->line_len = 0;
	} else if (ctrl && strcmp(name, "k") == 0) {
	iface->line_buffer[iface->line_pos] = '\0';
	iface->line_len = iface->line_pos;
	}
	}

	static jsval_t rl_interface_write(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface \|\| iface->closed) return js_mkundef();

	if (iface->paused) {
	iface->paused = false;
	emit_event(js, iface, "resume", NULL, 0);
	}

	if (nargs >= 2 && js_type(args[1]) == JS_OBJ) {
	jsval_t key = args[1];
	jsval_t name_val = js_get(js, key, "name");
	jsval_t ctrl_val = js_get(js, key, "ctrl");
	jsval_t meta_val = js_get(js, key, "meta");
	jsval_t shift_val = js_get(js, key, "shift");

	char *name = (js_type(name_val) == JS_STR) ? js_getstr(js, name_val, NULL) : NULL;
	bool ctrl = js_truthy(js, ctrl_val);
	bool meta = js_truthy(js, meta_val);
	bool shift = js_truthy(js, shift_val);

	if (name) {
	process_key_sequence(iface, name, ctrl, meta, shift);
	return js_mkundef();
	}
	}

	if (nargs < 1 \|\| js_type(args[0]) == JS_NULL \|\| js_type(args[0]) == JS_UNDEF) {
	return js_mkundef();
	}

	size_t len;
	char *data = js_getstr(js, args[0], &len);
	if (!data) return js_mkundef();

	for (size_t i = 0; i < len && iface->line_len < MAX_LINE_LENGTH - 1; i++) {
	char c = data[i];

	if (c == '\n' \|\| c == '\r') {
	process_line(js, iface);
	} else {
	memmove(iface->line_buffer + iface->line_pos + 1,
	iface->line_buffer + iface->line_pos,
	iface->line_len - iface->line_pos + 1);
	iface->line_buffer[iface->line_pos] = c;
	iface->line_pos++;
	iface->line_len++;
	}
	}

	return js_mkundef();
	}

	static jsval_t rl_interface_line_getter(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkundef();
	return js_mkstr(js, iface->line_buffer, strlen(iface->line_buffer));
	}

	static jsval_t rl_interface_cursor_getter(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mknum(0);
	return js_mknum((double)iface->line_pos);
	}

	static jsval_t rl_interface_question_callback(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface \|\| iface->closed) return js_mkundef();
	if (nargs < 2) return js_mkerr(js, "question requires query and callback");

	size_t query_len;
	char *query = js_getstr(js, args[0], &query_len);
	if (!query) return js_mkerr(js, "query must be a string");

	if (js_type(args[1]) != JS_FUNC) {
	return js_mkerr(js, "callback must be a function");
	}

	write_output(iface, query);

	RLEventType *evt = find_or_create_event_type(iface, "line");
	if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
	return js_mkerr(js, "maximum listeners reached");
	}

	evt->listeners[evt->listener_count].listener = args[1];
	evt->listeners[evt->listener_count].once = true;
	evt->listener_count++;

	return js_mkundef();
	}

	static jsval_t rl_interface_question_promise(struct js js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface \|\| iface->closed) return js_mkerr(js, "Interface is closed");
	if (nargs < 1) return js_mkerr(js, "question requires a query string");

	size_t query_len;
	char *query = js_getstr(js, args[0], &query_len);
	if (!query) return js_mkerr(js, "query must be a string");

	jsval_t promise = js_mkpromise(js);

	write_output(iface, query);

	iface->pending_question_resolve = js_get(js, promise, "_resolve");
	iface->pending_question_reject = js_get(js, promise, "_reject");

	return promise;
	}

	static jsval_t rl_interface_get_cursor_pos(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) {
	jsval_t result = js_mkobj(js);
	js_set(js, result, "rows", js_mknum(0));
	js_set(js, result, "cols", js_mknum(0));
	return result;
	}

	int prompt_len = (int)strlen(iface->prompt);
	int total_cols = prompt_len + iface->line_pos;

	int cols = 80;
	#ifndef _WIN32
	struct winsize ws;
	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col > 0) {
	cols = ws.ws_col;
	}
	#else
	CONSOLE_SCREEN_BUFFER_INFO csbi;
	if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi)) {
	cols = csbi.srWindow.Right - csbi.srWindow.Left + 1;
	}
	#endif

	int rows = total_cols / cols;
	int col_pos = total_cols % cols;

	jsval_t result = js_mkobj(js);
	js_set(js, result, "rows", js_mknum((double)rows));
	js_set(js, result, "cols", js_mknum((double)col_pos));
	return result;
	}

	static jsval_t rl_interface_closed_getter(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mktrue();
	return iface->closed ? js_mktrue() : js_mkfalse();
	}

	static jsval_t rl_interface_async_iterator(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	rl_interface_t *iface = get_interface(js, this_obj);

	if (!iface) return js_mkerr(js, "Invalid Interface");

	jsval_t iterator = js_mkobj(js);
	js_set(js, iterator, "_rl_id", js_mknum((double)iface->id));
	js_set(js, iterator, "_lines", js_mkarr(js));
	js_set(js, iterator, "_done", js_mkfalse());

	return iterator;
	}

	static void free_interface(rl_interface_t *iface) {
	if (!iface) return;

	HASH_DEL(interfaces, iface);

	free(iface->prompt);
	free(iface->line_buffer);
	rl_history_free(&iface->history);

	RLEventType evt, tmp;
	HASH_ITER(hh, iface->events, evt, tmp) {
	HASH_DEL(iface->events, evt);
	free(evt->event_type);
	free(evt);
	}

	free(iface);
	}

	static jsval_t rl_create_interface(struct js js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "createInterface requires options");

	jsval_t options = args[0];
	if (js_type(options) != JS_OBJ) return js_mkerr(js, "options must be an object");

	rl_interface_t *iface = calloc(1, sizeof(rl_interface_t));
	if (!iface) return js_mkerr(js, "out of memory");

	iface->id = next_interface_id++;
	iface->prompt = strdup(DEFAULT_PROMPT);
	iface->line_buffer = calloc(MAX_LINE_LENGTH, 1);
	iface->line_pos = 0;
	iface->line_len = 0;
	iface->paused = false;
	iface->closed = false;
	iface->reading = false;
	iface->pending_question_resolve = js_mkundef();
	iface->pending_question_reject = js_mkundef();
	iface->events = NULL;
	iface->tty_initialized = false;
	iface->escape_state = 0;
	iface->escape_len = 0;
	iface->js_obj = js_mkundef();
	#ifndef _WIN32
	iface->raw_mode = false;
	#endif

	iface->input_stream = js_get(js, options, "input");
	iface->output_stream = js_get(js, options, "output");

	jsval_t terminal_val = js_get(js, options, "terminal");
	iface->terminal = (js_type(terminal_val) == JS_TRUE) \|\|
	(js_type(terminal_val) == JS_UNDEF);

	jsval_t history_size_val = js_get(js, options, "historySize");
	iface->history_size = (js_type(history_size_val) == JS_NUM)
	? (int)js_getnum(history_size_val)
	: DEFAULT_HISTORY_SIZE;

	jsval_t remove_dup_val = js_get(js, options, "removeHistoryDuplicates");
	iface->remove_history_duplicates = js_truthy(js, remove_dup_val);

	jsval_t prompt_val = js_get(js, options, "prompt");
	if (js_type(prompt_val) == JS_STR) {
	free(iface->prompt);
	iface->prompt = strdup(js_getstr(js, prompt_val, NULL));
	}

	jsval_t crlf_delay_val = js_get(js, options, "crlfDelay");
	iface->crlf_delay = (js_type(crlf_delay_val) == JS_NUM)
	? (int)js_getnum(crlf_delay_val)
	: 100;
	if (iface->crlf_delay < 100) iface->crlf_delay = 100;

	jsval_t tab_size_val = js_get(js, options, "tabSize");
	iface->tab_size = (js_type(tab_size_val) == JS_NUM)
	? (int)js_getnum(tab_size_val)
	: DEFAULT_TAB_SIZE;
	if (iface->tab_size < 1) iface->tab_size = 1;

	jsval_t completer_val = js_get(js, options, "completer");
	iface->completer = (js_type(completer_val) == JS_FUNC) ? completer_val : js_mkundef();

	jsval_t history_val = js_get(js, options, "history");
	if (js_type(history_val) == JS_OBJ) {
	jsval_t len_val = js_get(js, history_val, "length");
	int len = (js_type(len_val) == JS_NUM) ? (int)js_getnum(len_val) : 0;

	rl_history_init(&iface->history, iface->history_size);

	for (int i = 0; i < len; i++) {
	char key[16];
	snprintf(key, sizeof(key), "%d", i);
	jsval_t item = js_get(js, history_val, key);
	if (js_type(item) == JS_STR) {
	char *line = js_getstr(js, item, NULL);
	if (line) rl_history_add(&iface->history, line, false);
	}
	}
	} else {
	rl_history_init(&iface->history, iface->history_size);
	}

	HASH_ADD(hh, interfaces, id, sizeof(uint64_t), iface);

	jsval_t obj = js_mkobj(js);
	js_set(js, obj, "_rl_id", js_mknum((double)iface->id));

	js_set(js, obj, "on", js_mkfun(rl_interface_on));
	js_set(js, obj, "once", js_mkfun(rl_interface_once));
	js_set(js, obj, "off", js_mkfun(rl_interface_off));
	js_set(js, obj, "addListener", js_mkfun(rl_interface_on));
	js_set(js, obj, "removeListener", js_mkfun(rl_interface_off));
	js_set(js, obj, "emit", js_mkfun(rl_interface_emit));

	js_set(js, obj, "close", js_mkfun(rl_interface_close));
	js_set(js, obj, "pause", js_mkfun(rl_interface_pause));
	js_set(js, obj, "resume", js_mkfun(rl_interface_resume));
	js_set(js, obj, "prompt", js_mkfun(rl_interface_prompt));
	js_set(js, obj, "setPrompt", js_mkfun(rl_interface_set_prompt));
	js_set(js, obj, "getPrompt", js_mkfun(rl_interface_get_prompt));
	js_set(js, obj, "write", js_mkfun(rl_interface_write));
	js_set(js, obj, "question", js_mkfun(rl_interface_question_callback));
	js_set(js, obj, "getCursorPos", js_mkfun(rl_interface_get_cursor_pos));

	js_set_getter_desc(js, obj, "line", 4, js_mkfun(rl_interface_line_getter), JS_DESC_E \| JS_DESC_C);
	js_set_getter_desc(js, obj, "cursor", 6, js_mkfun(rl_interface_cursor_getter), JS_DESC_E \| JS_DESC_C);
	js_set_getter_desc(js, obj, "closed", 6, js_mkfun(rl_interface_closed_getter), JS_DESC_E \| JS_DESC_C);

	js_set(js, obj, "terminal", iface->terminal ? js_mktrue() : js_mkfalse());
	js_set(js, obj, get_asyncIterator_sym_key(), js_mkfun(rl_interface_async_iterator));
	js_set(js, obj, get_toStringTag_sym_key(), js_mkstr(js, "Interface", 9));

	return obj;
	}

	static jsval_t rl_create_interface_promises(struct js js, jsval_t args, int nargs) {
	jsval_t iface_obj = rl_create_interface(js, args, nargs);
	if (js_type(iface_obj) == JS_ERR) return iface_obj;
	js_set(js, iface_obj, "question", js_mkfun(rl_interface_question_promise));

	return iface_obj;
	}

	static jsval_t rl_clear_line(struct js js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkfalse();
	int dir = (int)js_getnum(args[1]);

	const char *seq;
	switch (dir) {
	case -1: seq = "\033[1K"; break;
	case 1: seq = "\033[0K"; break;
	case 0:
	default: seq = "\033[2K\r"; break;
	}

	printf("%s", seq);
	fflush(stdout);

	return js_mktrue();
	}

	static jsval_t rl_clear_screen_down(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;

	printf("\033[J");
	fflush(stdout);

	return js_mktrue();
	}

	static jsval_t rl_cursor_to(struct js js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkfalse();
	int x = (int)js_getnum(args[1]);

	if (nargs >= 3 && js_type(args[2]) == JS_NUM) {
	int y = (int)js_getnum(args[2]);
	printf("\033[%d;%dH", y + 1, x + 1);
	} else {
	printf("\033[%dG", x + 1);
	}
	fflush(stdout);

	return js_mktrue();
	}

	static jsval_t rl_move_cursor(struct js js, jsval_t args, int nargs) {
	if (nargs < 3) return js_mkfalse();

	int dx = (int)js_getnum(args[1]);
	int dy = (int)js_getnum(args[2]);

	if (dx > 0) printf("\033[%dC", dx);
	else if (dx < 0) printf("\033[%dD", -dx);

	if (dy > 0) printf("\033[%dB", dy);
	else if (dy < 0) printf("\033[%dA", -dy);

	fflush(stdout);
	return js_mktrue();
	}

	static jsval_t rl_emit_keypress_events(struct js js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return js_mkundef();
	}

	bool has_active_readline_interfaces(void) {
	rl_interface_t iface, tmp;
	HASH_ITER(hh, interfaces, iface, tmp) {
	if (!iface->closed && iface->reading) return true;
	}
	return false;
	}

	void readline_gc_update_roots(GC_FWD_ARGS) {
	rl_interface_t iface, tmp;
	HASH_ITER(hh, interfaces, iface, tmp) {
	iface->input_stream = fwd_val(ctx, iface->input_stream);
	iface->output_stream = fwd_val(ctx, iface->output_stream);
	iface->completer = fwd_val(ctx, iface->completer);
	iface->js_obj = fwd_val(ctx, iface->js_obj);
	iface->pending_question_resolve = fwd_val(ctx, iface->pending_question_resolve);
	iface->pending_question_reject = fwd_val(ctx, iface->pending_question_reject);

	RLEventType evt, evt_tmp;
	HASH_ITER(hh, iface->events, evt, evt_tmp) {
	for (int i = 0; i < evt->listener_count; i++) evt->listeners[i].listener = fwd_val(ctx, evt->listeners[i].listener);
	}
	}
	}

	jsval_t readline_library(struct js *js) {
	jsval_t lib = js_mkobj(js);

	js_set(js, lib, "createInterface", js_mkfun(rl_create_interface));
	js_set(js, lib, "clearLine", js_mkfun(rl_clear_line));
	js_set(js, lib, "clearScreenDown", js_mkfun(rl_clear_screen_down));
	js_set(js, lib, "cursorTo", js_mkfun(rl_cursor_to));
	js_set(js, lib, "moveCursor", js_mkfun(rl_move_cursor));
	js_set(js, lib, "emitKeypressEvents", js_mkfun(rl_emit_keypress_events));
	js_set(js, lib, get_toStringTag_sym_key(), js_mkstr(js, "readline", 8));

	return lib;
	}

	jsval_t readline_promises_library(struct js *js) {
	jsval_t lib = js_mkobj(js);

	js_set(js, lib, "createInterface", js_mkfun(rl_create_interface_promises));
	js_set(js, lib, "clearLine", js_mkfun(rl_clear_line));
	js_set(js, lib, "clearScreenDown", js_mkfun(rl_clear_screen_down));
	js_set(js, lib, "cursorTo", js_mkfun(rl_cursor_to));
	js_set(js, lib, "moveCursor", js_mkfun(rl_move_cursor));
	js_set(js, lib, "emitKeypressEvents", js_mkfun(rl_emit_keypress_events));
	js_set(js, lib, get_toStringTag_sym_key(), js_mkstr(js, "readline/promises", 17));

	return lib;
	}

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