332 lines
10 KiB
C
332 lines
10 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013-2015 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "py/obj.h"
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#include "py/objmodule.h"
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#include "py/runtime.h"
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#include "py/builtin.h"
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#include "py/repl.h"
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#if MICROPY_HELPER_REPL
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#if MICROPY_PY_SYS_PS1_PS2
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const char *mp_repl_get_psx(unsigned int entry) {
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if (mp_obj_is_str(MP_STATE_VM(sys_mutable)[entry])) {
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return mp_obj_str_get_str(MP_STATE_VM(sys_mutable)[entry]);
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} else {
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return "";
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}
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}
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#endif
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STATIC bool str_startswith_word(const char *str, const char *head) {
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size_t i;
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for (i = 0; str[i] && head[i]; i++) {
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if (str[i] != head[i]) {
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return false;
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}
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}
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return head[i] == '\0' && (str[i] == '\0' || !unichar_isident(str[i]));
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}
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bool mp_repl_continue_with_input(const char *input) {
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// check for blank input
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if (input[0] == '\0') {
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return false;
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}
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// check if input starts with a certain keyword
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bool starts_with_compound_keyword =
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input[0] == '@'
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|| str_startswith_word(input, "if")
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|| str_startswith_word(input, "while")
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|| str_startswith_word(input, "for")
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|| str_startswith_word(input, "try")
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|| str_startswith_word(input, "with")
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|| str_startswith_word(input, "def")
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|| str_startswith_word(input, "class")
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#if MICROPY_PY_ASYNC_AWAIT
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|| str_startswith_word(input, "async")
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#endif
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;
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// check for unmatched open bracket, quote or escape quote
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#define Q_NONE (0)
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#define Q_1_SINGLE (1)
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#define Q_1_DOUBLE (2)
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#define Q_3_SINGLE (3)
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#define Q_3_DOUBLE (4)
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int n_paren = 0;
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int n_brack = 0;
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int n_brace = 0;
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int in_quote = Q_NONE;
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const char *i;
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for (i = input; *i; i++) {
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if (*i == '\'') {
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if ((in_quote == Q_NONE || in_quote == Q_3_SINGLE) && i[1] == '\'' && i[2] == '\'') {
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i += 2;
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in_quote = Q_3_SINGLE - in_quote;
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} else if (in_quote == Q_NONE || in_quote == Q_1_SINGLE) {
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in_quote = Q_1_SINGLE - in_quote;
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}
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} else if (*i == '"') {
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if ((in_quote == Q_NONE || in_quote == Q_3_DOUBLE) && i[1] == '"' && i[2] == '"') {
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i += 2;
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in_quote = Q_3_DOUBLE - in_quote;
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} else if (in_quote == Q_NONE || in_quote == Q_1_DOUBLE) {
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in_quote = Q_1_DOUBLE - in_quote;
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}
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} else if (*i == '\\' && (i[1] == '\'' || i[1] == '"' || i[1] == '\\')) {
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if (in_quote != Q_NONE) {
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i++;
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}
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} else if (in_quote == Q_NONE) {
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switch (*i) {
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case '(':
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n_paren += 1;
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break;
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case ')':
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n_paren -= 1;
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break;
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case '[':
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n_brack += 1;
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break;
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case ']':
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n_brack -= 1;
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break;
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case '{':
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n_brace += 1;
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break;
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case '}':
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n_brace -= 1;
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break;
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default:
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break;
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}
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}
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}
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// continue if unmatched 3-quotes
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if (in_quote == Q_3_SINGLE || in_quote == Q_3_DOUBLE) {
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return true;
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}
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// continue if unmatched brackets, but only if not in a 1-quote
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if ((n_paren > 0 || n_brack > 0 || n_brace > 0) && in_quote == Q_NONE) {
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return true;
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}
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// continue if last character was backslash (for line continuation)
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if (i[-1] == '\\') {
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return true;
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}
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// continue if compound keyword and last line was not empty
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if (starts_with_compound_keyword && i[-1] != '\n') {
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return true;
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}
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// otherwise, don't continue
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return false;
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}
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STATIC bool test_qstr(mp_obj_t obj, qstr name) {
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if (obj) {
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// try object member
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mp_obj_t dest[2];
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mp_load_method_protected(obj, name, dest, true);
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return dest[0] != MP_OBJ_NULL;
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} else {
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// try builtin module
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return mp_map_lookup((mp_map_t *)&mp_builtin_module_map,
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MP_OBJ_NEW_QSTR(name), MP_MAP_LOOKUP) != NULL;
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}
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}
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STATIC const char *find_completions(const char *s_start, size_t s_len,
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mp_obj_t obj, size_t *match_len, qstr *q_first, qstr *q_last) {
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const char *match_str = NULL;
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*match_len = 0;
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*q_first = *q_last = 0;
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size_t nqstr = QSTR_TOTAL();
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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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if (test_qstr(obj, q)) {
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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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return match_str;
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}
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STATIC void print_completions(const mp_print_t *print,
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const char *s_start, size_t s_len,
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mp_obj_t obj, qstr q_first, qstr q_last) {
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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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if (test_qstr(obj, q)) {
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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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}
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size_t mp_repl_autocomplete(const char *str, size_t len, const mp_print_t *print, const char **compl_str) {
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// scan backwards to find start of "a.b.c" chain
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const char *org_str = str;
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const char *top = str + len;
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for (const char *s = top; --s >= str;) {
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if (!(unichar_isalpha(*s) || unichar_isdigit(*s) || *s == '_' || *s == '.')) {
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++s;
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str = s;
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break;
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}
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}
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// begin search in outer global dict which is accessed from __main__
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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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s_start = str;
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while (str < top && *str != '.') {
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++str;
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}
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s_len = str - s_start;
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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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// 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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}
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// after "import", suggest built-in modules
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static const char import_str[] = "import ";
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if (len >= 7 && !memcmp(org_str, import_str, 7)) {
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obj = MP_OBJ_NULL;
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}
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// look for matches
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size_t match_len;
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qstr q_first, q_last;
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const char *match_str =
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find_completions(s_start, s_len, obj, &match_len, &q_first, &q_last);
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// nothing found
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if (q_first == 0) {
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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 && s_len > 0 && s_len < sizeof(import_str) - 1) {
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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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print_completions(print, s_start, s_len, obj, q_first, q_last);
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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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