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Improve REPL detecting when input needs to continue. 

Full CPython compatibility with this requires actually parsing the
input so far collected, and if it fails parsing due to lack of tokens,
then continue collecting input.  It's not worth doing it this way.  Not
having compatibility at this level does not hurt the goals of Micro
Python.
This commit is contained in:
Damien George 2014-04-08 11:04:29 +00:00
parent 72d70cb045
commit 97790455fe
7 changed files with 78 additions and 68 deletions
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63
py/repl.c
View File

@ -14,43 +14,66 @@ bool str_startswith_word(const char *str, const char *head) {
return head[i] == '\0' && (str[i] == '\0' || !unichar_isalpha(str[i]));
}
bool mp_repl_is_compound_stmt(const char *line) {
// compound if line starts with a certain keyword
if (
str_startswith_word(line, "if")
|| str_startswith_word(line, "while")
|| str_startswith_word(line, "for")
|| str_startswith_word(line, "try")
|| str_startswith_word(line, "with")
|| str_startswith_word(line, "def")
|| str_startswith_word(line, "class")
|| str_startswith_word(line, "@")
) {
return true;
bool mp_repl_continue_with_input(const char *input) {
// check for blank input
if (input[0] == '\0') {
return false;
}
// also "compound" if unmatched open bracket or triple quote
// 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;
for (const char *l = line; *l; l++) {
switch (*l) {
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 (l[1] == '"' && l[2] == '"') {
l += 2;
in_triple_quote = 1 - in_triple_quote;
if (in_triple_quote != '\'' && i[1] == '"' && i[2] == '"') {
i += 2;
in_triple_quote = '"' - in_triple_quote;
}
break;
}
}
return n_paren > 0 || n_brack > 0 || n_brace > 0 || in_triple_quote != 0;
// continue if unmatched brackets or quotes
if (n_paren > 0 || n_brack > 0 || n_brace > 0 || in_triple_quote != 0) {
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;
}
#endif // MICROPY_ENABLE_REPL_HELPERS

2
py/repl.h
View File

@ -1,3 +1,3 @@
#if MICROPY_ENABLE_REPL_HELPERS
bool mp_repl_is_compound_stmt(const char *line);
bool mp_repl_continue_with_input(const char *input);
#endif

15
stm/pyexec.c
View File

@ -283,15 +283,12 @@ void pyexec_repl(void) {
continue;
}
if (mp_repl_is_compound_stmt(vstr_str(&line))) {
for (;;) {
vstr_add_char(&line, '\n');
int len = vstr_len(&line);
int ret = readline(&line, "... ");
if (ret == VCP_CHAR_CTRL_D || vstr_len(&line) == len) {
// done entering compound statement
break;
}
while (mp_repl_continue_with_input(vstr_str(&line))) {
vstr_add_char(&line, '\n');
int ret = readline(&line, "... ");
if (ret == VCP_CHAR_CTRL_D) {
// stop entering compound statement
break;
}
}

15
stmhal/pyexec.c
View File

@ -204,15 +204,12 @@ friendly_repl_reset:
continue;
}
if (mp_repl_is_compound_stmt(vstr_str(&line))) {
for (;;) {
vstr_add_char(&line, '\n');
int len = vstr_len(&line);
int ret = readline(&line, "... ");
if (ret == VCP_CHAR_CTRL_D || vstr_len(&line) == len) {
// done entering compound statement
break;
}
while (mp_repl_continue_with_input(vstr_str(&line))) {
vstr_add_char(&line, '\n');
int ret = readline(&line, "... ");
if (ret == VCP_CHAR_CTRL_D) {
// stop entering compound statement
break;
}
}

15
teensy/main.c
View File

@ -399,15 +399,12 @@ void do_repl(void) {
continue;
}
if (mp_repl_is_compound_stmt(vstr_str(&line))) {
for (;;) {
vstr_add_char(&line, '\n');
int len = vstr_len(&line);
int ret = readline(&line, "... ");
if (ret == 0 || vstr_len(&line) == len) {
// done entering compound statement
break;
}
while (mp_repl_continue_with_input(vstr_str(&line))) {
vstr_add_char(&line, '\n');
int ret = readline(&line, "... ");
if (ret == 0) {
// stop entering compound statement
break;
}
}

18
unix/main.c
View File

@ -146,17 +146,15 @@ STATIC void do_repl(void) {
// EOF
return;
}
if (mp_repl_is_compound_stmt(line)) {
for (;;) {
char *line2 = prompt("... ");
if (line2 == NULL || strlen(line2) == 0) {
break;
}
char *line3 = strjoin(line, '\n', line2);
free(line);
free(line2);
line = line3;
while (mp_repl_continue_with_input(line)) {
char *line2 = prompt("... ");
if (line2 == NULL) {
break;
}
char *line3 = strjoin(line, '\n', line2);
free(line);
free(line2);
line = line3;
}
mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, line, strlen(line), false);

18
windows/main.c
View File

@ -126,17 +126,15 @@ static void do_repl(void) {
// EOF
return;
}
if (mp_repl_is_compound_stmt(line)) {
for (;;) {
char *line2 = prompt("... ");
if (line2 == NULL || strlen(line2) == 0) {
break;
}
char *line3 = str_join(line, '\n', line2);
free(line);
free(line2);
line = line3;
while (mp_repl_continue_with_input(line)) {
char *line2 = prompt("... ");
if (line2 == NULL) {
break;
}
char *line3 = str_join(line, '\n', line2);
free(line);
free(line2);
line = line3;
}
mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, line, strlen(line), false);