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javascript for 🐜's, a tiny runtime with big ambitions antjs.org
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175#include <compat.h> // IWYU pragma: keep
#include <errno.h>#include <limits.h>#include <math.h>#include <stdio.h>#include <string.h>
#ifdef _WIN32#include <io.h>#define ANT_WRITE_FD _write#else#include <unistd.h>#define ANT_WRITE_FD write#endif
#include "ant.h"#include "value.h"#include "tty_ctrl.h"
bool tty_ctrl_write_fd(int fd, const char *data, size_t len) { if (fd < 0 || !data) return false; if (len == 0) return true;
size_t off = 0; while (off < len) {#ifdef _WIN32 size_t rem = len - off; unsigned int chunk = (rem > (size_t)INT_MAX) ? (unsigned int)INT_MAX : (unsigned int)rem; int wrote = ANT_WRITE_FD(fd, data + off, chunk); if (wrote <= 0) return false; off += (size_t)wrote;#else ssize_t wrote = ANT_WRITE_FD(fd, data + off, len - off); if (wrote < 0) { if (errno == EINTR) continue; return false; } if (wrote == 0) return false; off += (size_t)wrote;#endif }
return true;}
bool tty_ctrl_write_stream(FILE *stream, const char *data, size_t len, bool flush) { if (!stream || !data) return false; if (len > 0 && fwrite(data, 1, len, stream) != len) return false; if (flush && fflush(stream) != 0) return false; return true;}
bool tty_ctrl_parse_int_value(ant_value_t value, int *out) { if (vtype(value) != kTypeNumber) return false; double d = js_getnum(value); if (!isfinite(d)) return false; if (d < (double)INT_MIN || d > (double)INT_MAX) return false; int i = (int)d; if ((double)i != d) return false; *out = i; return true;}
int tty_ctrl_normalize_clear_line_dir(int dir) { if (dir < 0) return -1; if (dir > 0) return 1; return 0;}
int tty_ctrl_normalize_coord(int value) { return value < 0 ? 0 : value;}
bool tty_ctrl_parse_clear_line_dir(ant_value_t *args, int nargs, int dir_index, int *dir_out) { int dir = 0; if (nargs > dir_index && vtype(args[dir_index]) != kTypeUndefined) { if (!tty_ctrl_parse_int_value(args[dir_index], &dir)) return false; } *dir_out = tty_ctrl_normalize_clear_line_dir(dir); return true;}
bool tty_ctrl_parse_cursor_to_args( ant_value_t *args, int nargs, int x_index, int y_index, tty_ctrl_cursor_to_args_t *out) { if (!out || nargs <= x_index) return false;
int x = 0; if (!tty_ctrl_parse_int_value(args[x_index], &x)) return false; out->x = tty_ctrl_normalize_coord(x); out->has_y = false; out->y = 0;
if (nargs > y_index && vtype(args[y_index]) != kTypeUndefined) { int y = 0; if (!tty_ctrl_parse_int_value(args[y_index], &y)) return false; out->has_y = true; out->y = tty_ctrl_normalize_coord(y); }
return true;}
bool tty_ctrl_parse_move_cursor_args( ant_value_t *args, int nargs, int dx_index, int dy_index, int *dx, int *dy) { if (!dx || !dy) return false; if (nargs <= dy_index) return false; if (!tty_ctrl_parse_int_value(args[dx_index], dx)) return false; if (!tty_ctrl_parse_int_value(args[dy_index], dy)) return false; return true;}
const char *tty_ctrl_clear_line_seq(int dir, size_t *len_out) { dir = tty_ctrl_normalize_clear_line_dir(dir); const char *seq = "\033[2K\r"; if (dir < 0) seq = "\033[1K"; else if (dir > 0) seq = "\033[0K";
if (len_out) *len_out = strlen(seq); return seq;}
const char *tty_ctrl_clear_screen_down_seq(size_t *len_out) { static const char seq[] = "\033[0J"; if (len_out) *len_out = sizeof(seq) - 1; return seq;}
bool tty_ctrl_build_cursor_to(char *buf, size_t buf_size, int x, bool has_y, int y, size_t *len_out) { if (!buf || buf_size == 0) return false;
int n = 0; if (has_y) n = snprintf(buf, buf_size, "\033[%d;%dH", y + 1, x + 1); else n = snprintf(buf, buf_size, "\033[%dG", x + 1);
if (n < 0 || (size_t)n >= buf_size) return false; if (len_out) *len_out = (size_t)n; return true;}
bool tty_ctrl_build_move_cursor_axis(char *buf, size_t buf_size, int delta, bool horizontal, size_t *len_out) { if (!buf || buf_size == 0) return false;
if (delta == 0) { if (len_out) *len_out = 0; return true; }
int amount = (delta < 0) ? -delta : delta; char cmd = 0; if (horizontal) cmd = (delta > 0) ? 'C' : 'D'; else cmd = (delta > 0) ? 'B' : 'A';
int n = snprintf(buf, buf_size, "\033[%d%c", amount, cmd); if (n < 0 || (size_t)n >= buf_size) return false;
if (len_out) *len_out = (size_t)n; return true;}
ant_value_t tty_ctrl_bool_result(ant_t *js, bool ok) { return js_bool(ok);}