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Add vstr_ins and vstr_cut_out; improve stmhal readline.

This commit is contained in:
Damien George 2014-03-15 14:33:09 +00:00
parent 8b96af6907
commit 280e7208d8
8 changed files with 175 additions and 38 deletions
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4
py/builtinimport.c
View File

@ -211,13 +211,13 @@ mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
vstr_add_char(&path, PATH_SEP_CHAR);
vstr_add_str(&path, "__init__.py");
if (mp_import_stat(vstr_str(&path)) != MP_IMPORT_STAT_FILE) {
vstr_cut_tail(&path, sizeof("/__init__.py") - 1); // cut off /__init__.py
vstr_cut_tail_bytes(&path, sizeof("/__init__.py") - 1); // cut off /__init__.py
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ImportError,
"Per PEP-420 a dir without __init__.py (%s) is a namespace package; "
"namespace packages are not supported", vstr_str(&path)));
}
do_load(module_obj, &path);
vstr_cut_tail(&path, sizeof("/__init__.py") - 1); // cut off /__init__.py
vstr_cut_tail_bytes(&path, sizeof("/__init__.py") - 1); // cut off /__init__.py
} else { // MP_IMPORT_STAT_FILE
do_load(module_obj, &path);
// TODO: We cannot just break here, at the very least, we must execute

2
py/lexer.c
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@ -516,7 +516,7 @@ STATIC void mp_lexer_next_token_into(mp_lexer_t *lex, mp_token_t *tok, bool firs
}
// cut off the end quotes from the token text
vstr_cut_tail(&lex->vstr, n_closing);
vstr_cut_tail_bytes(&lex->vstr, n_closing);
} else if (is_head_of_identifier(lex)) {
tok->kind = MP_TOKEN_NAME;

10
py/misc.h
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@ -63,8 +63,8 @@ bool unichar_isxdigit(unichar c);
/** variable string *********************************************/
typedef struct _vstr_t {
int alloc;
int len;
uint alloc;
uint len;
char *buf;
bool had_error : 1;
bool fixed_buf : 1;
@ -94,7 +94,11 @@ void vstr_add_str(vstr_t *vstr, const char *str);
void vstr_add_strn(vstr_t *vstr, const char *str, int len);
//void vstr_add_le16(vstr_t *vstr, unsigned short v);
//void vstr_add_le32(vstr_t *vstr, unsigned int v);
void vstr_cut_tail(vstr_t *vstr, int len);
void vstr_ins_byte(vstr_t *vstr, uint byte_pos, byte b);
void vstr_ins_char(vstr_t *vstr, uint char_pos, unichar chr);
void vstr_cut_head_bytes(vstr_t *vstr, uint bytes_to_cut);
void vstr_cut_tail_bytes(vstr_t *vstr, uint bytes_to_cut);
void vstr_cut_out_bytes(vstr_t *vstr, uint byte_pos, uint bytes_to_cut);
void vstr_printf(vstr_t *vstr, const char *fmt, ...);
/** non-dynamic size-bounded variable buffer/string *************/

60
py/vstr.c
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@ -159,12 +159,12 @@ char *vstr_add_len(vstr_t *vstr, int len) {
return buf;
}
void vstr_add_byte(vstr_t *vstr, byte v) {
void vstr_add_byte(vstr_t *vstr, byte b) {
byte *buf = (byte*)vstr_add_len(vstr, 1);
if (buf == NULL) {
return;
}
buf[0] = v;
buf[0] = b;
}
void vstr_add_char(vstr_t *vstr, unichar c) {
@ -214,7 +214,48 @@ void vstr_add_le32(vstr_t *vstr, unsigned int v) {
}
*/
void vstr_cut_tail(vstr_t *vstr, int len) {
char *vstr_ins_blank_bytes(vstr_t *vstr, uint byte_pos, uint byte_len) {
if (vstr->had_error) {
return NULL;
}
uint l = vstr->len;
if (byte_pos > l) {
byte_pos = l;
}
if (byte_len > 0) {
// ensure room for the new bytes
if (!vstr_ensure_extra(vstr, byte_len)) {
return NULL;
}
// copy up the string to make room for the new bytes
memmove(vstr->buf + l - 1 + byte_len, vstr->buf + l - 1, l - byte_pos);
// increase the length
vstr->len += byte_len;
vstr->buf[vstr->len] = 0;
}
return vstr->buf + byte_pos;
}
void vstr_ins_byte(vstr_t *vstr, uint byte_pos, byte b) {
char *s = vstr_ins_blank_bytes(vstr, byte_pos, 1);
if (s != NULL) {
*s = b;
}
}
void vstr_ins_char(vstr_t *vstr, uint pos, unichar chr) {
// TODO UNICODE
char *s = vstr_ins_blank_bytes(vstr, pos, 1);
if (s != NULL) {
*s = chr;
}
}
void vstr_cut_head_bytes(vstr_t *vstr, uint bytes_to_cut) {
vstr_cut_out_bytes(vstr, 0, bytes_to_cut);
}
void vstr_cut_tail_bytes(vstr_t *vstr, uint len) {
if (vstr->had_error) {
return;
}
@ -226,6 +267,19 @@ void vstr_cut_tail(vstr_t *vstr, int len) {
vstr->buf[vstr->len] = 0;
}
void vstr_cut_out_bytes(vstr_t *vstr, uint byte_pos, uint bytes_to_cut) {
if (vstr->had_error || byte_pos >= vstr->len) {
return;
} else if (byte_pos + bytes_to_cut >= vstr->len) {
vstr->len = byte_pos;
vstr->buf[vstr->len] = 0;
} else {
// move includes +1 for null byte at the end
memmove(vstr->buf + byte_pos, vstr->buf + byte_pos + bytes_to_cut, vstr->len - byte_pos - bytes_to_cut + 1);
vstr->len -= bytes_to_cut;
}
}
void vstr_printf(vstr_t *vstr, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);

2
stm/pyexec.c
View File

@ -88,7 +88,7 @@ int readline(vstr_t *line, const char *prompt) {
escape = true;
} else if (c == 127) {
if (vstr_len(line) > len) {
vstr_cut_tail(line, 1);
vstr_cut_tail_bytes(line, 1);
stdout_tx_str("\b \b");
}
} else if (32 <= c && c <= 126) {

118
stmhal/pyexec.c
View File

@ -38,6 +38,16 @@ void stdout_tx_str(const char *str) {
usb_vcp_send_str(str);
}
void stdout_tx_strn(const char *str, uint len) {
if (pyb_usart_global_debug != PYB_USART_NONE) {
usart_tx_strn(pyb_usart_global_debug, str, len);
}
#if defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
lcd_print_strn(str, len);
#endif
usb_vcp_send_strn(str, len);
}
int stdin_rx_chr(void) {
for (;;) {
#if 0
@ -77,36 +87,49 @@ static const char *readline_hist[READLINE_HIST_SIZE] = {NULL, NULL, NULL, NULL,
int readline(vstr_t *line, const char *prompt) {
stdout_tx_str(prompt);
int len = vstr_len(line);
int orig_line_len = line->len;
int escape_seq = 0;
int hist_num = 0;
int hist_cur = -1;
int cursor_pos = orig_line_len;
for (;;) {
int c = stdin_rx_chr();
int last_line_len = line->len;
int redraw_step_back = 0;
bool redraw_from_cursor = false;
int redraw_step_forward = 0;
if (escape_seq == 0) {
if (VCP_CHAR_CTRL_A <= c && c <= VCP_CHAR_CTRL_D && vstr_len(line) == len) {
if (VCP_CHAR_CTRL_A <= c && c <= VCP_CHAR_CTRL_D && vstr_len(line) == orig_line_len) {
// control character with empty line
return c;
} else if (c == '\r') {
// newline
stdout_tx_str("\r\n");
if (line->len > orig_line_len && (readline_hist[0] == NULL || strcmp(readline_hist[0], line->buf + orig_line_len) != 0)) {
// a line which is not empty and different from the last one
// so update the history
for (int i = READLINE_HIST_SIZE - 1; i > 0; i--) {
readline_hist[i] = readline_hist[i - 1];
}
readline_hist[0] = str_dup(vstr_str(line));
readline_hist[0] = str_dup(line->buf + orig_line_len);
}
return 0;
} else if (c == 27) {
// escape sequence
escape_seq = 1;
} else if (c == 127) {
// backspace
if (vstr_len(line) > len) {
vstr_cut_tail(line, 1);
stdout_tx_str("\b \b");
if (cursor_pos > orig_line_len) {
vstr_cut_out_bytes(line, cursor_pos - 1, 1);
// set redraw parameters
redraw_step_back = 1;
redraw_from_cursor = true;
}
} else if (32 <= c && c <= 126) {
// printable character
vstr_add_char(line, c);
stdout_tx_str(line->buf + line->len - 1);
vstr_ins_char(line, cursor_pos, c);
// set redraw parameters
redraw_from_cursor = true;
redraw_step_forward = 1;
}
} else if (escape_seq == 1) {
if (c == '[') {
@ -118,23 +141,78 @@ int readline(vstr_t *line, const char *prompt) {
escape_seq = 0;
if (c == 'A') {
// up arrow
if (hist_num < READLINE_HIST_SIZE && readline_hist[hist_num] != NULL) {
// erase line
for (int i = line->len - len; i > 0; i--) {
stdout_tx_str("\b \b");
}
// set line to history
line->len = len;
vstr_add_str(line, readline_hist[hist_num]);
// draw line
stdout_tx_str(readline_hist[hist_num]);
if (hist_cur + 1 < READLINE_HIST_SIZE && readline_hist[hist_cur + 1] != NULL) {
// increase hist num
hist_num += 1;
hist_cur += 1;
// set line to history
line->len = orig_line_len;
vstr_add_str(line, readline_hist[hist_cur]);
// set redraw parameters
redraw_step_back = cursor_pos - orig_line_len;
redraw_from_cursor = true;
redraw_step_forward = line->len - orig_line_len;
}
} else if (c == 'B') {
// down arrow
if (hist_cur >= 0) {
// decrease hist num
hist_cur -= 1;
// set line to history
vstr_cut_tail_bytes(line, line->len - orig_line_len);
if (hist_cur >= 0) {
vstr_add_str(line, readline_hist[hist_cur]);
}
// set redraw parameters
redraw_step_back = cursor_pos - orig_line_len;
redraw_from_cursor = true;
redraw_step_forward = line->len - orig_line_len;
}
} else if (c == 'C') {
// right arrow
if (cursor_pos < line->len) {
redraw_step_forward = 1;
}
} else if (c == 'D') {
// left arrow
if (cursor_pos > orig_line_len) {
redraw_step_back = 1;
}
}
} else {
escape_seq = 0;
}
// redraw command prompt, efficiently
if (redraw_step_back > 0) {
for (int i = 0; i < redraw_step_back; i++) {
stdout_tx_str("\b");
}
cursor_pos -= redraw_step_back;
}
if (redraw_from_cursor) {
if (line->len < last_line_len) {
// erase old chars
for (int i = cursor_pos; i < last_line_len; i++) {
stdout_tx_str(" ");
}
// step back
for (int i = cursor_pos; i < last_line_len; i++) {
stdout_tx_str("\b");
}
}
// draw new chars
stdout_tx_strn(line->buf + cursor_pos, line->len - cursor_pos);
// move cursor forward if needed (already moved forward by length of line, so move it back)
for (int i = cursor_pos + redraw_step_forward; i < line->len; i++) {
stdout_tx_str("\b");
}
cursor_pos += redraw_step_forward;
} else if (redraw_step_forward > 0) {
// draw over old chars to move cursor forwards
stdout_tx_strn(line->buf + cursor_pos, redraw_step_forward);
cursor_pos += redraw_step_forward;
}
HAL_Delay(1);
}
}

10
stmhal/usart.c
View File

@ -159,13 +159,13 @@ void usart_tx_str(pyb_usart_t usart_id, const char *str) {
}
}
void usart_tx_bytes(pyb_usart_t usart_id, const char *data, uint len) {
for (; len > 0; data++, len--) {
usart_tx_char(usart_id, *data);
void usart_tx_strn(pyb_usart_t usart_id, const char *str, uint len) {
for (; len > 0; str++, len--) {
usart_tx_char(usart_id, *str);
}
}
void usart_tx_strn_cooked(pyb_usart_t usart_id, const char *str, int len) {
void usart_tx_strn_cooked(pyb_usart_t usart_id, const char *str, uint len) {
for (const char *top = str + len; str < top; str++) {
if (*str == '\n') {
usart_tx_char(usart_id, '\r');
@ -219,7 +219,7 @@ static mp_obj_t usart_obj_tx_str(mp_obj_t self_in, mp_obj_t s) {
if (MP_OBJ_IS_STR(s)) {
uint len;
const char *data = mp_obj_str_get_data(s, &len);
usart_tx_bytes(self->usart_id, data, len);
usart_tx_strn(self->usart_id, data, len);
}
}
return mp_const_none;

3
stmhal/usart.h
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@ -18,7 +18,8 @@ void usart_init(pyb_usart_t usart_id, uint32_t baudrate);
bool usart_rx_any(pyb_usart_t usart_id);
int usart_rx_char(pyb_usart_t usart_id);
void usart_tx_str(pyb_usart_t usart_id, const char *str);
void usart_tx_strn_cooked(pyb_usart_t usart_id, const char *str, int len);
void usart_tx_strn(pyb_usart_t usart_id, const char *str, uint len);
void usart_tx_strn_cooked(pyb_usart_t usart_id, const char *str, uint len);
#if 0
MP_DECLARE_CONST_FUN_OBJ(pyb_Usart_obj);