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Native code implementation for expanding ANSI escape codes

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Kovid Goyal
2022-11-25 17:33:41 +05:30
parent 4d3f3b5e91
commit cfc6bd4da5
4 changed files with 92 additions and 3 deletions
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69
kitty/data-types.c
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@@ -233,8 +233,77 @@ wrapped_kittens(PyObject *self UNUSED, PyObject *args UNUSED) {
return ans;
}
static PyObject*
expand_ansi_c_escapes(PyObject *self UNUSED, PyObject *src) {
enum { NORMAL, PREV_ESC, HEX_DIGIT, OCT_DIGIT, CONTROL_CHAR } state = NORMAL;
if (PyUnicode_READY(src) != 0) return NULL;
int max_num_hex_digits = 0, hex_digit_idx = 0;
char hex_digits[16];
Py_ssize_t idx = 0, dest_idx = 0;
PyObject *dest = PyUnicode_New(PyUnicode_GET_LENGTH(src)*2, 1114111);
if (dest == NULL) return NULL;
const int kind = PyUnicode_KIND(src), dest_kind = PyUnicode_KIND(dest);
const void *data = PyUnicode_DATA(src), *dest_data = PyUnicode_DATA(dest);
#define w(ch) { PyUnicode_WRITE(dest_kind, dest_data, dest_idx, ch); dest_idx++; }
#define write_digits(base) { hex_digits[hex_digit_idx] = 0; if (hex_digit_idx > 0) w(strtol(hex_digits, NULL, base)); hex_digit_idx = 0; state = NORMAL; }
#define add_digit(base) { hex_digits[hex_digit_idx++] = ch; if (idx >= PyUnicode_GET_LENGTH(src)) write_digits(base); }
START_ALLOW_CASE_RANGE
while (idx < PyUnicode_GET_LENGTH(src)) {
Py_UCS4 ch = PyUnicode_READ(kind, data, idx); idx++;
switch(state) {
case NORMAL: {
if (ch == '\\' && idx < PyUnicode_GET_LENGTH(src)) {
state = PREV_ESC;
continue;
}
w(ch);
} break;
case CONTROL_CHAR: w(ch & 0x1f); state = NORMAL; break;
case HEX_DIGIT: {
if (hex_digit_idx < max_num_hex_digits && (('0' <= ch && ch <= '9') || ('a' <= ch && ch <= 'f') || ('A' <= ch && ch <= 'F'))) add_digit(16)
else { write_digits(16); w(ch); }
}; break;
case OCT_DIGIT: {
if ('0' <= ch && ch <= '7' && hex_digit_idx < max_num_hex_digits) add_digit(16)
else { write_digits(8); w(ch); }
}; break;
case PREV_ESC: {
state = NORMAL;
switch(ch) {
default: w('\\'); w(ch); break;
case 'a': w(7); break;
case 'b': w(8); break;
case 'c': if (idx < PyUnicode_GET_LENGTH(src)) {state = CONTROL_CHAR;} else {w('\\'); w(ch);}; break;
case 'e': case 'E': w(27); break;
case 'f': w(12); break;
case 'n': w(10); break;
case 'r': w(13); break;
case 't': w(9); break;
case 'v': w(11); break;
case 'x': max_num_hex_digits = 2; hex_digit_idx = 0; state = HEX_DIGIT; break;
case 'u': max_num_hex_digits = 4; hex_digit_idx = 0; state = HEX_DIGIT; break;
case 'U': max_num_hex_digits = 8; hex_digit_idx = 0; state = HEX_DIGIT; break;
case '0' ... '7': max_num_hex_digits = 3; hex_digits[0] = ch; hex_digit_idx = 1; state = OCT_DIGIT; break;
case '\\': w('\\'); break;
case '?': w('?'); break;
case '"': w('"'); break;
case '\'': w('\''); break;
}
} break;
}
}
#undef add_digit
#undef write_digits
#undef w
END_ALLOW_CASE_RANGE
PyObject *ans = PyUnicode_FromKindAndData(dest_kind, dest_data, dest_idx);
Py_DECREF(dest);
return ans;
}
static PyMethodDef module_methods[] = {
{"wcwidth", (PyCFunction)wcwidth_wrap, METH_O, ""},
{"expand_ansi_c_escapes", (PyCFunction)expand_ansi_c_escapes, METH_O, ""},
{"get_docs_ref_map", (PyCFunction)get_docs_ref_map, METH_NOARGS, ""},
{"getpeereid", (PyCFunction)py_getpeereid, METH_VARARGS, ""},
{"wcswidth", (PyCFunction)wcswidth_std, METH_O, ""},