circuitpython/py/repl.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2015 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/obj.h"
#include "py/runtime.h"
#include "py/repl.h"
#if MICROPY_HELPER_REPL
STATIC bool str_startswith_word(const char *str, const char *head) {
mp_uint_t i;
for (i = 0; str[i] && head[i]; i++) {
if (str[i] != head[i]) {
return false;
}
}
return head[i] == '\0' && (str[i] == '\0' || !unichar_isalpha(str[i]));
}
bool mp_repl_continue_with_input(const char *input) {
// check for blank input
if (input[0] == '\0') {
return false;
}
// check if input starts with a certain keyword
bool starts_with_compound_keyword =
input[0] == '@'
|| str_startswith_word(input, "if")
|| str_startswith_word(input, "while")
|| str_startswith_word(input, "for")
|| str_startswith_word(input, "try")
|| str_startswith_word(input, "with")
|| str_startswith_word(input, "def")
|| str_startswith_word(input, "class")
;
// check for unmatched open bracket or triple quote
// TODO don't look at triple quotes inside single quotes
int n_paren = 0;
int n_brack = 0;
int n_brace = 0;
int in_triple_quote = 0;
const char *i;
for (i = input; *i; i++) {
switch (*i) {
case '(': n_paren += 1; break;
case ')': n_paren -= 1; break;
case '[': n_brack += 1; break;
case ']': n_brack -= 1; break;
case '{': n_brace += 1; break;
case '}': n_brace -= 1; break;
case '\'':
if (in_triple_quote != '"' && i[1] == '\'' && i[2] == '\'') {
i += 2;
in_triple_quote = '\'' - in_triple_quote;
}
break;
case '"':
if (in_triple_quote != '\'' && i[1] == '"' && i[2] == '"') {
i += 2;
in_triple_quote = '"' - in_triple_quote;
}
break;
}
}
// continue if unmatched brackets or quotes
if (n_paren > 0 || n_brack > 0 || n_brace > 0 || in_triple_quote != 0) {
return true;
}
// continue if last character was backslash (for line continuation)
if (i[-1] == '\\') {
return true;
}
// continue if compound keyword and last line was not empty
if (starts_with_compound_keyword && i[-1] != '\n') {
return true;
}
// otherwise, don't continue
return false;
}
mp_uint_t mp_repl_autocomplete(const char *str, mp_uint_t len, const mp_print_t *print, const char **compl_str) {
// scan backwards to find start of "a.b.c" chain
const char *top = str + len;
for (const char *s = top; --s >= str;) {
if (!(unichar_isalpha(*s) || unichar_isdigit(*s) || *s == '_' || *s == '.')) {
++s;
str = s;
break;
}
}
// begin search in locals dict
mp_obj_dict_t *dict = mp_locals_get();
for (;;) {
// get next word in string to complete
const char *s_start = str;
while (str < top && *str != '.') {
++str;
}
mp_uint_t s_len = str - s_start;
if (str < top) {
// a complete word, lookup in current dict
mp_obj_t obj = MP_OBJ_NULL;
for (mp_uint_t i = 0; i < dict->map.alloc; i++) {
if (MP_MAP_SLOT_IS_FILLED(&dict->map, i)) {
mp_uint_t d_len;
const char *d_str = mp_obj_str_get_data(dict->map.table[i].key, &d_len);
if (s_len == d_len && strncmp(s_start, d_str, d_len) == 0) {
obj = dict->map.table[i].value;
break;
}
}
}
if (obj == MP_OBJ_NULL) {
// lookup failed
return 0;
}
// found an object of this name; try to get its dict
if (MP_OBJ_IS_TYPE(obj, &mp_type_module)) {
dict = mp_obj_module_get_globals(obj);
} else {
mp_obj_type_t *type;
if (MP_OBJ_IS_TYPE(obj, &mp_type_type)) {
type = obj;
} else {
type = mp_obj_get_type(obj);
}
if (type->locals_dict != MP_OBJ_NULL && MP_OBJ_IS_TYPE(type->locals_dict, &mp_type_dict)) {
dict = type->locals_dict;
} else {
// obj has no dict
return 0;
}
}
// skip '.' to move to next word
++str;
} else {
// end of string, do completion on this partial name
// look for matches
int n_found = 0;
const char *match_str = NULL;
mp_uint_t match_len = 0;
for (mp_uint_t i = 0; i < dict->map.alloc; i++) {
if (MP_MAP_SLOT_IS_FILLED(&dict->map, i)) {
mp_uint_t d_len;
const char *d_str = mp_obj_str_get_data(dict->map.table[i].key, &d_len);
if (s_len <= d_len && strncmp(s_start, d_str, s_len) == 0) {
if (match_str == NULL) {
match_str = d_str;
match_len = d_len;
} else {
for (mp_uint_t i = s_len; i < match_len && i < d_len; ++i) {
if (match_str[i] != d_str[i]) {
match_len = i;
break;
}
}
}
++n_found;
}
}
}
// nothing found
if (n_found == 0) {
return 0;
}
// 1 match found, or multiple matches with a common prefix
if (n_found == 1 || match_len > s_len) {
*compl_str = match_str + s_len;
return match_len - s_len;
}
// multiple matches found, print them out
#define WORD_SLOT_LEN (16)
#define MAX_LINE_LEN (4 * WORD_SLOT_LEN)
int line_len = MAX_LINE_LEN; // force a newline for first word
for (mp_uint_t i = 0; i < dict->map.alloc; i++) {
if (MP_MAP_SLOT_IS_FILLED(&dict->map, i)) {
mp_uint_t d_len;
const char *d_str = mp_obj_str_get_data(dict->map.table[i].key, &d_len);
if (s_len <= d_len && strncmp(s_start, d_str, s_len) == 0) {
int gap = (line_len + WORD_SLOT_LEN - 1) / WORD_SLOT_LEN * WORD_SLOT_LEN - line_len;
if (gap < 2) {
gap += WORD_SLOT_LEN;
}
if (line_len + gap + d_len <= MAX_LINE_LEN) {
// TODO optimise printing of gap?
for (int i = 0; i < gap; ++i) {
mp_print_str(print, " ");
}
mp_print_str(print, d_str);
line_len += gap + d_len;
} else {
mp_printf(print, "\n%s", d_str);
line_len = d_len;
}
}
}
}
mp_print_str(print, "\n");
return (mp_uint_t)(-1); // indicate many matches
}
}
}
#endif // MICROPY_HELPER_REPL