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ant/src/modules/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>
#define WIN32_LEAN_AND_MEAN
#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 "errors.h"
#include "runtime.h"
#include "internal.h"
#include "descriptors.h"
#include "silver/engine.h"
#include "modules/readline.h"
#include "modules/process.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;
int last_render_rows;
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(ant_t *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];
sv_vm_call(js->vm, js, listener->listener, js_mkundef(), args, nargs, NULL, false);
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(ant_t *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(ant_t *js, rl_interface_t *iface) {
jsval_t history_arr = get_history_array(js, iface);
emit_event(js, iface, "history", &history_arr, 1);
}
static void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf);
static void on_stdin_read(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf);
#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) {
fputs(str, stdout);
fflush(stdout);
}
static int get_terminal_cols(void) {
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
return cols > 0 ? cols : 80;
}
static void move_cursor_to_line_start(rl_interface_t *iface, int cols) {
int prompt_len = (int)strlen(iface->prompt);
int cursor_cols = prompt_len + iface->line_pos;
int cursor_row = cursor_cols / cols;
if (cursor_cols > 0 && cursor_cols % cols == 0) cursor_row--;
if (cursor_row > 0) {
char move_buf[32];
snprintf(move_buf, sizeof(move_buf), "\033[%dA", cursor_row);
write_output(iface, move_buf);
}
write_output(iface, "\r");
}
static void clear_line_display(rl_interface_t *iface) {
int cols = get_terminal_cols();
int prompt_len = (int)strlen(iface->prompt);
int line_cols = prompt_len + iface->line_len;
int current_rows = line_cols > 0 ? (line_cols - 1) / cols + 1 : 1;
int rows = iface->last_render_rows > current_rows ? iface->last_render_rows : current_rows;
move_cursor_to_line_start(iface, cols);
for (int i = 0; i < rows; i++) {
write_output(iface, "\033[K");
if (i < rows - 1) {
write_output(iface, "\033[B\r");
}
}
for (int i = 0; i < rows - 1; i++) {
write_output(iface, "\033[A");
}
write_output(iface, "\r");
}
static void refresh_line(rl_interface_t *iface) {
char buf[MAX_LINE_LENGTH + 256];
int cols = get_terminal_cols();
clear_line_display(iface);
snprintf(buf, sizeof(buf), "%s%s", iface->prompt, iface->line_buffer);
write_output(iface, buf);
int prompt_len = (int)strlen(iface->prompt);
int end_cols = prompt_len + iface->line_len;
int end_row = end_cols > 0 ? end_cols / cols : 0;
int cursor_cols = prompt_len + iface->line_pos;
int cursor_row = cursor_cols > 0 ? cursor_cols / cols : 0;
int cursor_col = cursor_cols > 0 ? cursor_cols % cols : 0;
int up_rows = end_row - cursor_row;
if (up_rows > 0) {
char move_buf[32];
snprintf(move_buf, sizeof(move_buf), "\033[%dA", up_rows);
write_output(iface, move_buf);
}
write_output(iface, "\r");
if (cursor_col > 0) {
char move_buf[32];
snprintf(move_buf, sizeof(move_buf), "\033[%dC", cursor_col);
write_output(iface, move_buf);
}
iface->last_render_rows = end_cols > 0 ? end_cols / cols + 1 : 1;
}
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 = (int)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 = (int)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) {
int cols = get_terminal_cols();
int prompt_len = (int)strlen(iface->prompt);
int total_cols = prompt_len + iface->line_len;
int rows = total_cols > 0 ? total_cols / cols + 1 : 1;
if (rows > iface->last_render_rows) iface->last_render_rows = rows;
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;
ant_t *js = rt->js;
if (!iface) {
if (buf->base) free(buf->base);
return;
}
if (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 (vtype(iface->pending_question_resolve) == T_FUNC) {
sv_vm_call(js->vm, js, iface->pending_question_resolve, js_mkundef(), &line_val, 1, NULL, false);
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(ant_t *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 (vtype(iface->pending_question_resolve) == T_FUNC) {
sv_vm_call(js->vm, js, iface->pending_question_resolve, js_mkundef(), &line_val, 1, NULL, false);
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(ant_t *js, jsval_t this_obj) {
jsval_t id_val = js_get(js, this_obj, "_rl_id");
if (vtype(id_val) != T_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(ant_t *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");
int t = vtype(args[1]);
if (t != T_FUNC && t != T_CFUNC) 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(ant_t *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");
int t = vtype(args[1]);
if (t != T_FUNC && t != T_CFUNC) 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(ant_t *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(ant_t *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_false;
char *event = js_getstr(js, args[0], NULL);
if (!event) return js_false;
emit_event(js, iface, event, nargs > 1 ? &args[1] : NULL, nargs - 1);
return js_true;
}
static jsval_t rl_interface_close(ant_t *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(ant_t *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(ant_t *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(ant_t *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(ant_t *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(ant_t *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(ant_t *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 && is_special_object(args[1])) {
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 = (vtype(name_val) == T_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 || vtype(args[0]) == T_NULL || vtype(args[0]) == T_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(ant_t *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(ant_t *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(ant_t *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");
int t = vtype(args[1]);
if (t != T_FUNC && t != T_CFUNC) {
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(ant_t *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(ant_t *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(ant_t *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_true;
return js_bool(iface->closed);
}
static jsval_t rl_interface_async_iterator(ant_t *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_false);
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(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 1) return js_mkerr(js, "createInterface requires options");
jsval_t options = args[0];
if (!is_special_object(options)) 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->last_render_rows = 1;
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 = terminal_val == js_true || vtype(terminal_val) == T_UNDEF;
jsval_t history_size_val = js_get(js, options, "historySize");
iface->history_size = (vtype(history_size_val) == T_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 (vtype(prompt_val) == T_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 = (vtype(crlf_delay_val) == T_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 = (vtype(tab_size_val) == T_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");
int ctype = vtype(completer_val);
iface->completer = (ctype == T_FUNC || ctype == T_CFUNC) ? completer_val : js_mkundef();
jsval_t history_val = js_get(js, options, "history");
if (is_special_object(history_val)) {
jsval_t len_val = js_get(js, history_val, "length");
int len = (vtype(len_val) == T_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 (vtype(item) == T_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", js_bool(iface->terminal));
js_set_sym(js, obj, get_asyncIterator_sym(), js_mkfun(rl_interface_async_iterator));
js_set_sym(js, obj, get_toStringTag_sym(), js_mkstr(js, "Interface", 9));
return obj;
}
static jsval_t rl_create_interface_promises(ant_t *js, jsval_t *args, int nargs) {
jsval_t iface_obj = rl_create_interface(js, args, nargs);
if (vtype(iface_obj) == T_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(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 2) return js_false;
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;
}
fputs(seq, stdout);
fflush(stdout);
return js_true;
}
static jsval_t rl_clear_screen_down(ant_t *js, jsval_t *args, int nargs) {
(void)args; (void)nargs;
printf("\033[J");
fflush(stdout);
return js_true;
}
static jsval_t rl_cursor_to(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 2) return js_false;
int x = (int)js_getnum(args[1]);
if (nargs >= 3 && vtype(args[2]) == T_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_true;
}
static jsval_t rl_move_cursor(ant_t *js, jsval_t *args, int nargs) {
if (nargs < 3) return js_false;
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_true;
}
static jsval_t rl_emit_keypress_events(ant_t *js, jsval_t *args, int nargs) {
if (nargs > 0) {
jsval_t stdin_obj = js_get(js, js_get(js, js_glob(js), "process"), "stdin");
if (stdin_obj != args[0]) {
return js_mkerr(js, "emitKeypressEvents only supports process.stdin");
}
}
process_enable_keypress_events();
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_OP_VAL_ARGS) {
rl_interface_t *iface, *tmp;
HASH_ITER(hh, interfaces, iface, tmp) {
op_val(ctx, &iface->input_stream);
op_val(ctx, &iface->output_stream);
op_val(ctx, &iface->completer);
op_val(ctx, &iface->js_obj);
op_val(ctx, &iface->pending_question_resolve);
op_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++) op_val(ctx, &evt->listeners[i].listener);
}
}
}
jsval_t readline_library(ant_t *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_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "readline", 8));
return lib;
}
jsval_t readline_promises_library(ant_t *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_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "readline/promises", 17));
return lib;
}

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