py/repl: Refactor autocomplete to reduce nesting.
Originally at adafruit#4548 Signed-off-by: Artyom Skrobov <tyomitch@gmail.com>
This commit is contained in:
Artyom Skrobov
Damien George
parent
befbff31b7
commit
f85ea8d4fe
219
py/repl.c
219
py/repl.c
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@ -161,131 +161,134 @@ size_t mp_repl_autocomplete(const char *str, size_t len, const mp_print_t *print
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mp_obj_t obj = MP_OBJ_FROM_PTR(&mp_module___main__);
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mp_obj_t dest[2];
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const char *s_start;
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size_t s_len;
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for (;;) {
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// get next word in string to complete
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const char *s_start = str;
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s_start = str;
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while (str < top && *str != '.') {
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++str;
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}
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size_t s_len = str - s_start;
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s_len = str - s_start;
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if (str < top) {
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// a complete word, lookup in current object
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qstr q = qstr_find_strn(s_start, s_len);
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if (q == MP_QSTRnull) {
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// lookup will fail
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return 0;
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}
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mp_load_method_protected(obj, q, dest, true);
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obj = dest[0]; // attribute, method, or MP_OBJ_NULL if nothing found
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if (obj == MP_OBJ_NULL) {
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// lookup failed
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return 0;
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}
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// skip '.' to move to next word
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++str;
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} else {
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if (str == top) {
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// end of string, do completion on this partial name
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break;
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}
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// look for matches
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const char *match_str = NULL;
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size_t match_len = 0;
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qstr q_first = 0, q_last = 0;
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for (qstr q = MP_QSTR_ + 1; q < nqstr; ++q) {
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size_t d_len;
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const char *d_str = (const char *)qstr_data(q, &d_len);
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// special case; filter out words that begin with underscore
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// unless there's already a partial match
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if (s_len == 0 && d_str[0] == '_') {
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continue;
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}
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if (s_len <= d_len && strncmp(s_start, d_str, s_len) == 0) {
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mp_load_method_protected(obj, q, dest, true);
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if (dest[0] != MP_OBJ_NULL) {
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if (match_str == NULL) {
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match_str = d_str;
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match_len = d_len;
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} else {
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// search for longest common prefix of match_str and d_str
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// (assumes these strings are null-terminated)
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for (size_t j = s_len; j <= match_len && j <= d_len; ++j) {
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if (match_str[j] != d_str[j]) {
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match_len = j;
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break;
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}
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}
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}
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if (q_first == 0) {
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q_first = q;
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}
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q_last = q;
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}
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}
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}
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// a complete word, lookup in current object
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qstr q = qstr_find_strn(s_start, s_len);
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if (q == MP_QSTRnull) {
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// lookup will fail
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return 0;
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}
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mp_load_method_protected(obj, q, dest, true);
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obj = dest[0]; // attribute, method, or MP_OBJ_NULL if nothing found
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// nothing found
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if (q_first == 0) {
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if (s_len == 0) {
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*compl_str = " ";
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return 4;
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}
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// If there're no better alternatives, and if it's first word
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// in the line, try to complete "import".
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if (s_start == org_str) {
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static const char import_str[] = "import ";
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if (memcmp(s_start, import_str, s_len) == 0) {
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*compl_str = import_str + s_len;
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return sizeof(import_str) - 1 - s_len;
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}
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}
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if (obj == MP_OBJ_NULL) {
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// lookup failed
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return 0;
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}
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return 0;
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}
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// skip '.' to move to next word
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++str;
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}
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// 1 match found, or multiple matches with a common prefix
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if (q_first == q_last || match_len > s_len) {
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*compl_str = match_str + s_len;
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return match_len - s_len;
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}
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// multiple matches found, print them out
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#define WORD_SLOT_LEN (16)
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#define MAX_LINE_LEN (4 * WORD_SLOT_LEN)
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int line_len = MAX_LINE_LEN; // force a newline for first word
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for (qstr q = q_first; q <= q_last; ++q) {
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size_t d_len;
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const char *d_str = (const char *)qstr_data(q, &d_len);
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if (s_len <= d_len && strncmp(s_start, d_str, s_len) == 0) {
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mp_load_method_protected(obj, q, dest, true);
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if (dest[0] != MP_OBJ_NULL) {
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int gap = (line_len + WORD_SLOT_LEN - 1) / WORD_SLOT_LEN * WORD_SLOT_LEN - line_len;
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if (gap < 2) {
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gap += WORD_SLOT_LEN;
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}
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if (line_len + gap + d_len <= MAX_LINE_LEN) {
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// TODO optimise printing of gap?
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for (int j = 0; j < gap; ++j) {
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mp_print_str(print, " ");
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}
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mp_print_str(print, d_str);
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line_len += gap + d_len;
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} else {
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mp_printf(print, "\n%s", d_str);
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line_len = d_len;
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// look for matches
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const char *match_str = NULL;
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size_t match_len = 0;
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qstr q_first = 0, q_last = 0;
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for (qstr q = MP_QSTR_ + 1; q < nqstr; ++q) {
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size_t d_len;
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const char *d_str = (const char *)qstr_data(q, &d_len);
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// special case; filter out words that begin with underscore
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// unless there's already a partial match
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if (s_len == 0 && d_str[0] == '_') {
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continue;
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}
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if (s_len <= d_len && strncmp(s_start, d_str, s_len) == 0) {
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mp_load_method_protected(obj, q, dest, true);
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if (dest[0] != MP_OBJ_NULL) {
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if (match_str == NULL) {
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match_str = d_str;
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match_len = d_len;
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} else {
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// search for longest common prefix of match_str and d_str
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// (assumes these strings are null-terminated)
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for (size_t j = s_len; j <= match_len && j <= d_len; ++j) {
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if (match_str[j] != d_str[j]) {
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match_len = j;
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break;
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}
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}
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}
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if (q_first == 0) {
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q_first = q;
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}
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q_last = q;
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}
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mp_print_str(print, "\n");
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return (size_t)(-1); // indicate many matches
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}
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}
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// nothing found
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if (q_first == 0) {
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if (s_len == 0) {
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*compl_str = " ";
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return 4;
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}
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// If there're no better alternatives, and if it's first word
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// in the line, try to complete "import".
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if (s_start == org_str) {
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static const char import_str[] = "import ";
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if (memcmp(s_start, import_str, s_len) == 0) {
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*compl_str = import_str + s_len;
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return sizeof(import_str) - 1 - s_len;
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}
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}
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return 0;
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}
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// 1 match found, or multiple matches with a common prefix
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if (q_first == q_last || match_len > s_len) {
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*compl_str = match_str + s_len;
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return match_len - s_len;
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}
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// multiple matches found, print them out
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#define WORD_SLOT_LEN (16)
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#define MAX_LINE_LEN (4 * WORD_SLOT_LEN)
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int line_len = MAX_LINE_LEN; // force a newline for first word
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for (qstr q = q_first; q <= q_last; ++q) {
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size_t d_len;
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const char *d_str = (const char *)qstr_data(q, &d_len);
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if (s_len <= d_len && strncmp(s_start, d_str, s_len) == 0) {
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mp_load_method_protected(obj, q, dest, true);
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if (dest[0] != MP_OBJ_NULL) {
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int gap = (line_len + WORD_SLOT_LEN - 1) / WORD_SLOT_LEN * WORD_SLOT_LEN - line_len;
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if (gap < 2) {
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gap += WORD_SLOT_LEN;
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}
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if (line_len + gap + d_len <= MAX_LINE_LEN) {
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// TODO optimise printing of gap?
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for (int j = 0; j < gap; ++j) {
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mp_print_str(print, " ");
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}
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mp_print_str(print, d_str);
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line_len += gap + d_len;
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} else {
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mp_printf(print, "\n%s", d_str);
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line_len = d_len;
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}
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}
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}
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}
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mp_print_str(print, "\n");
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return (size_t)(-1); // indicate many matches
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}
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#endif // MICROPY_HELPER_REPL
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