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2272 lines (2046 loc) · 60.8 KB
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Copy pathpegen.c
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2272 lines (2046 loc) · 60.8 KB
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#include <Python.h>
#include <errcode.h>
#include "../tokenizer.h"
#include "pegen.h"
#include "parse_string.h"
#include "ast.h"
PyObject *
_PyPegen_new_type_comment(Parser *p, char *s)
{
PyObject *res = PyUnicode_DecodeUTF8(s, strlen(s), NULL);
if (res == NULL) {
return NULL;
}
if (PyArena_AddPyObject(p->arena, res) < 0) {
Py_DECREF(res);
return NULL;
}
return res;
}
arg_ty
_PyPegen_add_type_comment_to_arg(Parser *p, arg_ty a, Token *tc)
{
if (tc == NULL) {
return a;
}
char *bytes = PyBytes_AsString(tc->bytes);
if (bytes == NULL) {
return NULL;
}
PyObject *tco = _PyPegen_new_type_comment(p, bytes);
if (tco == NULL) {
return NULL;
}
return arg(a->arg, a->annotation, tco,
a->lineno, a->col_offset, a->end_lineno, a->end_col_offset,
p->arena);
}
static int
init_normalization(Parser *p)
{
if (p->normalize) {
return 1;
}
PyObject *m = PyImport_ImportModuleNoBlock("unicodedata");
if (!m)
{
return 0;
}
p->normalize = PyObject_GetAttrString(m, "normalize");
Py_DECREF(m);
if (!p->normalize)
{
return 0;
}
return 1;
}
/* Checks if the NOTEQUAL token is valid given the current parser flags
0 indicates success and nonzero indicates failure (an exception may be set) */
int
_PyPegen_check_barry_as_flufl(Parser *p, Token* t) {
assert(t->bytes != NULL);
assert(t->type == NOTEQUAL);
char* tok_str = PyBytes_AS_STRING(t->bytes);
if (p->flags & PyPARSE_BARRY_AS_BDFL && strcmp(tok_str, "<>") != 0) {
RAISE_SYNTAX_ERROR("with Barry as BDFL, use '<>' instead of '!='");
return -1;
}
if (!(p->flags & PyPARSE_BARRY_AS_BDFL)) {
return strcmp(tok_str, "!=");
}
return 0;
}
PyObject *
_PyPegen_new_identifier(Parser *p, char *n)
{
PyObject *id = PyUnicode_DecodeUTF8(n, strlen(n), NULL);
if (!id) {
goto error;
}
/* PyUnicode_DecodeUTF8 should always return a ready string. */
assert(PyUnicode_IS_READY(id));
/* Check whether there are non-ASCII characters in the
identifier; if so, normalize to NFKC. */
if (!PyUnicode_IS_ASCII(id))
{
PyObject *id2;
if (!init_normalization(p))
{
Py_DECREF(id);
goto error;
}
PyObject *form = PyUnicode_InternFromString("NFKC");
if (form == NULL)
{
Py_DECREF(id);
goto error;
}
PyObject *args[2] = {form, id};
id2 = _PyObject_FastCall(p->normalize, args, 2);
Py_DECREF(id);
Py_DECREF(form);
if (!id2) {
goto error;
}
if (!PyUnicode_Check(id2))
{
PyErr_Format(PyExc_TypeError,
"unicodedata.normalize() must return a string, not "
"%.200s",
_PyType_Name(Py_TYPE(id2)));
Py_DECREF(id2);
goto error;
}
id = id2;
}
PyUnicode_InternInPlace(&id);
if (PyArena_AddPyObject(p->arena, id) < 0)
{
Py_DECREF(id);
goto error;
}
return id;
error:
p->error_indicator = 1;
return NULL;
}
static PyObject *
_create_dummy_identifier(Parser *p)
{
return _PyPegen_new_identifier(p, "");
}
static inline Py_ssize_t
byte_offset_to_character_offset(PyObject *line, Py_ssize_t col_offset)
{
const char *str = PyUnicode_AsUTF8(line);
if (!str) {
return 0;
}
assert(col_offset >= 0 && (unsigned long)col_offset <= strlen(str));
PyObject *text = PyUnicode_DecodeUTF8(str, col_offset, "replace");
if (!text) {
return 0;
}
Py_ssize_t size = PyUnicode_GET_LENGTH(text);
Py_DECREF(text);
return size;
}
const char *
_PyPegen_get_expr_name(expr_ty e)
{
assert(e != NULL);
switch (e->kind) {
case Attribute_kind:
return "attribute";
case Subscript_kind:
return "subscript";
case Starred_kind:
return "starred";
case Name_kind:
return "name";
case List_kind:
return "list";
case Tuple_kind:
return "tuple";
case Lambda_kind:
return "lambda";
case Call_kind:
return "function call";
case BoolOp_kind:
case BinOp_kind:
case UnaryOp_kind:
return "operator";
case GeneratorExp_kind:
return "generator expression";
case Yield_kind:
case YieldFrom_kind:
return "yield expression";
case Await_kind:
return "await expression";
case ListComp_kind:
return "list comprehension";
case SetComp_kind:
return "set comprehension";
case DictComp_kind:
return "dict comprehension";
case Dict_kind:
return "dict display";
case Set_kind:
return "set display";
case JoinedStr_kind:
case FormattedValue_kind:
return "f-string expression";
case Constant_kind: {
PyObject *value = e->v.Constant.value;
if (value == Py_None) {
return "None";
}
if (value == Py_False) {
return "False";
}
if (value == Py_True) {
return "True";
}
if (value == Py_Ellipsis) {
return "Ellipsis";
}
return "literal";
}
case Compare_kind:
return "comparison";
case IfExp_kind:
return "conditional expression";
case NamedExpr_kind:
return "named expression";
default:
PyErr_Format(PyExc_SystemError,
"unexpected expression in assignment %d (line %d)",
e->kind, e->lineno);
return NULL;
}
}
static int
raise_decode_error(Parser *p)
{
assert(PyErr_Occurred());
const char *errtype = NULL;
if (PyErr_ExceptionMatches(PyExc_UnicodeError)) {
errtype = "unicode error";
}
else if (PyErr_ExceptionMatches(PyExc_ValueError)) {
errtype = "value error";
}
if (errtype) {
PyObject *type;
PyObject *value;
PyObject *tback;
PyObject *errstr;
PyErr_Fetch(&type, &value, &tback);
errstr = PyObject_Str(value);
if (errstr) {
RAISE_SYNTAX_ERROR("(%s) %U", errtype, errstr);
Py_DECREF(errstr);
}
else {
PyErr_Clear();
RAISE_SYNTAX_ERROR("(%s) unknown error", errtype);
}
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(tback);
}
return -1;
}
static void
raise_tokenizer_init_error(PyObject *filename)
{
if (!(PyErr_ExceptionMatches(PyExc_LookupError)
|| PyErr_ExceptionMatches(PyExc_SyntaxError)
|| PyErr_ExceptionMatches(PyExc_ValueError)
|| PyErr_ExceptionMatches(PyExc_UnicodeDecodeError))) {
return;
}
PyObject *errstr = NULL;
PyObject *tuple = NULL;
PyObject *type;
PyObject *value;
PyObject *tback;
PyErr_Fetch(&type, &value, &tback);
errstr = PyObject_Str(value);
if (!errstr) {
goto error;
}
PyObject *tmp = Py_BuildValue("(OiiO)", filename, 0, -1, Py_None);
if (!tmp) {
goto error;
}
tuple = PyTuple_Pack(2, errstr, tmp);
Py_DECREF(tmp);
if (!value) {
goto error;
}
PyErr_SetObject(PyExc_SyntaxError, tuple);
error:
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(tback);
Py_XDECREF(errstr);
Py_XDECREF(tuple);
}
static int
tokenizer_error(Parser *p)
{
if (PyErr_Occurred()) {
return -1;
}
const char *msg = NULL;
PyObject* errtype = PyExc_SyntaxError;
Py_ssize_t col_offset = -1;
switch (p->tok->done) {
case E_TOKEN:
msg = "invalid token";
break;
case E_EOFS:
RAISE_SYNTAX_ERROR("EOF while scanning triple-quoted string literal");
return -1;
case E_EOLS:
RAISE_SYNTAX_ERROR("EOL while scanning string literal");
return -1;
case E_EOF:
RAISE_SYNTAX_ERROR("unexpected EOF while parsing");
return -1;
case E_DEDENT:
RAISE_INDENTATION_ERROR("unindent does not match any outer indentation level");
return -1;
case E_INTR:
if (!PyErr_Occurred()) {
PyErr_SetNone(PyExc_KeyboardInterrupt);
}
return -1;
case E_NOMEM:
PyErr_NoMemory();
return -1;
case E_TABSPACE:
errtype = PyExc_TabError;
msg = "inconsistent use of tabs and spaces in indentation";
break;
case E_TOODEEP:
errtype = PyExc_IndentationError;
msg = "too many levels of indentation";
break;
case E_LINECONT: {
col_offset = p->tok->cur - p->tok->buf - 1;
msg = "unexpected character after line continuation character";
break;
}
default:
msg = "unknown parsing error";
}
RAISE_ERROR_KNOWN_LOCATION(p, errtype, p->tok->lineno,
col_offset >= 0 ? col_offset : 0, msg);
return -1;
}
void *
_PyPegen_raise_error(Parser *p, PyObject *errtype, const char *errmsg, ...)
{
Token *t = p->known_err_token != NULL ? p->known_err_token : p->tokens[p->fill - 1];
Py_ssize_t col_offset;
if (t->col_offset == -1) {
col_offset = Py_SAFE_DOWNCAST(p->tok->cur - p->tok->buf,
intptr_t, int);
} else {
col_offset = t->col_offset + 1;
}
va_list va;
va_start(va, errmsg);
_PyPegen_raise_error_known_location(p, errtype, t->lineno,
col_offset, errmsg, va);
va_end(va);
return NULL;
}
void *
_PyPegen_raise_error_known_location(Parser *p, PyObject *errtype,
Py_ssize_t lineno, Py_ssize_t col_offset,
const char *errmsg, va_list va)
{
PyObject *value = NULL;
PyObject *errstr = NULL;
PyObject *error_line = NULL;
PyObject *tmp = NULL;
p->error_indicator = 1;
if (p->start_rule == Py_fstring_input) {
const char *fstring_msg = "f-string: ";
Py_ssize_t len = strlen(fstring_msg) + strlen(errmsg);
char *new_errmsg = PyMem_RawMalloc(len + 1); // Lengths of both strings plus NULL character
if (!new_errmsg) {
return (void *) PyErr_NoMemory();
}
// Copy both strings into new buffer
memcpy(new_errmsg, fstring_msg, strlen(fstring_msg));
memcpy(new_errmsg + strlen(fstring_msg), errmsg, strlen(errmsg));
new_errmsg[len] = 0;
errmsg = new_errmsg;
}
errstr = PyUnicode_FromFormatV(errmsg, va);
if (!errstr) {
goto error;
}
if (p->start_rule == Py_file_input) {
error_line = PyErr_ProgramTextObject(p->tok->filename, (int) lineno);
}
if (!error_line) {
Py_ssize_t size = p->tok->inp - p->tok->buf;
error_line = PyUnicode_DecodeUTF8(p->tok->buf, size, "replace");
if (!error_line) {
goto error;
}
}
if (p->start_rule == Py_fstring_input) {
col_offset -= p->starting_col_offset;
}
Py_ssize_t col_number = col_offset;
if (p->tok->encoding != NULL) {
col_number = byte_offset_to_character_offset(error_line, col_offset);
}
tmp = Py_BuildValue("(OiiN)", p->tok->filename, lineno, col_number, error_line);
if (!tmp) {
goto error;
}
value = PyTuple_Pack(2, errstr, tmp);
Py_DECREF(tmp);
if (!value) {
goto error;
}
PyErr_SetObject(errtype, value);
Py_DECREF(errstr);
Py_DECREF(value);
if (p->start_rule == Py_fstring_input) {
PyMem_RawFree((void *)errmsg);
}
return NULL;
error:
Py_XDECREF(errstr);
Py_XDECREF(error_line);
if (p->start_rule == Py_fstring_input) {
PyMem_RawFree((void *)errmsg);
}
return NULL;
}
#if 0
static const char *
token_name(int type)
{
if (0 <= type && type <= N_TOKENS) {
return _PyParser_TokenNames[type];
}
return "<Huh?>";
}
#endif
// Here, mark is the start of the node, while p->mark is the end.
// If node==NULL, they should be the same.
int
_PyPegen_insert_memo(Parser *p, int mark, int type, void *node)
{
// Insert in front
Memo *m = PyArena_Malloc(p->arena, sizeof(Memo));
if (m == NULL) {
return -1;
}
m->type = type;
m->node = node;
m->mark = p->mark;
m->next = p->tokens[mark]->memo;
p->tokens[mark]->memo = m;
return 0;
}
// Like _PyPegen_insert_memo(), but updates an existing node if found.
int
_PyPegen_update_memo(Parser *p, int mark, int type, void *node)
{
for (Memo *m = p->tokens[mark]->memo; m != NULL; m = m->next) {
if (m->type == type) {
// Update existing node.
m->node = node;
m->mark = p->mark;
return 0;
}
}
// Insert new node.
return _PyPegen_insert_memo(p, mark, type, node);
}
// Return dummy NAME.
void *
_PyPegen_dummy_name(Parser *p, ...)
{
static void *cache = NULL;
if (cache != NULL) {
return cache;
}
PyObject *id = _create_dummy_identifier(p);
if (!id) {
return NULL;
}
cache = Name(id, Load, 1, 0, 1, 0, p->arena);
return cache;
}
static int
_get_keyword_or_name_type(Parser *p, const char *name, int name_len)
{
assert(name_len > 0);
if (name_len >= p->n_keyword_lists ||
p->keywords[name_len] == NULL ||
p->keywords[name_len]->type == -1) {
return NAME;
}
for (KeywordToken *k = p->keywords[name_len]; k != NULL && k->type != -1; k++) {
if (strncmp(k->str, name, name_len) == 0) {
return k->type;
}
}
return NAME;
}
static int
growable_comment_array_init(growable_comment_array *arr, size_t initial_size) {
assert(initial_size > 0);
arr->items = PyMem_Malloc(initial_size * sizeof(*arr->items));
arr->size = initial_size;
arr->num_items = 0;
return arr->items != NULL;
}
static int
growable_comment_array_add(growable_comment_array *arr, int lineno, char *comment) {
if (arr->num_items >= arr->size) {
size_t new_size = arr->size * 2;
void *new_items_array = PyMem_Realloc(arr->items, new_size * sizeof(*arr->items));
if (!new_items_array) {
return 0;
}
arr->items = new_items_array;
arr->size = new_size;
}
arr->items[arr->num_items].lineno = lineno;
arr->items[arr->num_items].comment = comment; // Take ownership
arr->num_items++;
return 1;
}
static void
growable_comment_array_deallocate(growable_comment_array *arr) {
for (unsigned i = 0; i < arr->num_items; i++) {
PyMem_Free(arr->items[i].comment);
}
PyMem_Free(arr->items);
}
int
_PyPegen_fill_token(Parser *p)
{
const char *start;
const char *end;
int type = PyTokenizer_Get(p->tok, &start, &end);
// Record and skip '# type: ignore' comments
while (type == TYPE_IGNORE) {
Py_ssize_t len = end - start;
char *tag = PyMem_Malloc(len + 1);
if (tag == NULL) {
PyErr_NoMemory();
return -1;
}
strncpy(tag, start, len);
tag[len] = '\0';
// Ownership of tag passes to the growable array
if (!growable_comment_array_add(&p->type_ignore_comments, p->tok->lineno, tag)) {
PyErr_NoMemory();
return -1;
}
type = PyTokenizer_Get(p->tok, &start, &end);
}
if (type == ENDMARKER && p->start_rule == Py_single_input && p->parsing_started) {
type = NEWLINE; /* Add an extra newline */
p->parsing_started = 0;
if (p->tok->indent && !(p->flags & PyPARSE_DONT_IMPLY_DEDENT)) {
p->tok->pendin = -p->tok->indent;
p->tok->indent = 0;
}
}
else {
p->parsing_started = 1;
}
if (p->fill == p->size) {
int newsize = p->size * 2;
Token **new_tokens = PyMem_Realloc(p->tokens, newsize * sizeof(Token *));
if (new_tokens == NULL) {
PyErr_NoMemory();
return -1;
}
p->tokens = new_tokens;
for (int i = p->size; i < newsize; i++) {
p->tokens[i] = PyMem_Malloc(sizeof(Token));
if (p->tokens[i] == NULL) {
p->size = i; // Needed, in order to cleanup correctly after parser fails
PyErr_NoMemory();
return -1;
}
memset(p->tokens[i], '\0', sizeof(Token));
}
p->size = newsize;
}
Token *t = p->tokens[p->fill];
t->type = (type == NAME) ? _get_keyword_or_name_type(p, start, (int)(end - start)) : type;
t->bytes = PyBytes_FromStringAndSize(start, end - start);
if (t->bytes == NULL) {
return -1;
}
if (PyArena_AddPyObject(p->arena, t->bytes) < 0) {
Py_DECREF(t->bytes);
return -1;
}
int lineno = type == STRING ? p->tok->first_lineno : p->tok->lineno;
const char *line_start = type == STRING ? p->tok->multi_line_start : p->tok->line_start;
int end_lineno = p->tok->lineno;
int col_offset = -1;
int end_col_offset = -1;
if (start != NULL && start >= line_start) {
col_offset = (int)(start - line_start);
}
if (end != NULL && end >= p->tok->line_start) {
end_col_offset = (int)(end - p->tok->line_start);
}
t->lineno = p->starting_lineno + lineno;
t->col_offset = p->tok->lineno == 1 ? p->starting_col_offset + col_offset : col_offset;
t->end_lineno = p->starting_lineno + end_lineno;
t->end_col_offset = p->tok->lineno == 1 ? p->starting_col_offset + end_col_offset : end_col_offset;
p->fill += 1;
if (type == ERRORTOKEN) {
if (p->tok->done == E_DECODE) {
return raise_decode_error(p);
}
return tokenizer_error(p);
}
return 0;
}
// Instrumentation to count the effectiveness of memoization.
// The array counts the number of tokens skipped by memoization,
// indexed by type.
#define NSTATISTICS 2000
static long memo_statistics[NSTATISTICS];
void
_PyPegen_clear_memo_statistics()
{
for (int i = 0; i < NSTATISTICS; i++) {
memo_statistics[i] = 0;
}
}
PyObject *
_PyPegen_get_memo_statistics()
{
PyObject *ret = PyList_New(NSTATISTICS);
if (ret == NULL) {
return NULL;
}
for (int i = 0; i < NSTATISTICS; i++) {
PyObject *value = PyLong_FromLong(memo_statistics[i]);
if (value == NULL) {
Py_DECREF(ret);
return NULL;
}
// PyList_SetItem borrows a reference to value.
if (PyList_SetItem(ret, i, value) < 0) {
Py_DECREF(ret);
return NULL;
}
}
return ret;
}
int // bool
_PyPegen_is_memoized(Parser *p, int type, void *pres)
{
if (p->mark == p->fill) {
if (_PyPegen_fill_token(p) < 0) {
p->error_indicator = 1;
return -1;
}
}
Token *t = p->tokens[p->mark];
for (Memo *m = t->memo; m != NULL; m = m->next) {
if (m->type == type) {
if (0 <= type && type < NSTATISTICS) {
long count = m->mark - p->mark;
// A memoized negative result counts for one.
if (count <= 0) {
count = 1;
}
memo_statistics[type] += count;
}
p->mark = m->mark;
*(void **)(pres) = m->node;
return 1;
}
}
return 0;
}
int
_PyPegen_lookahead_with_name(int positive, expr_ty (func)(Parser *), Parser *p)
{
int mark = p->mark;
void *res = func(p);
p->mark = mark;
return (res != NULL) == positive;
}
int
_PyPegen_lookahead_with_string(int positive, expr_ty (func)(Parser *, const char*), Parser *p, const char* arg)
{
int mark = p->mark;
void *res = func(p, arg);
p->mark = mark;
return (res != NULL) == positive;
}
int
_PyPegen_lookahead_with_int(int positive, Token *(func)(Parser *, int), Parser *p, int arg)
{
int mark = p->mark;
void *res = func(p, arg);
p->mark = mark;
return (res != NULL) == positive;
}
int
_PyPegen_lookahead(int positive, void *(func)(Parser *), Parser *p)
{
int mark = p->mark;
void *res = (void*)func(p);
p->mark = mark;
return (res != NULL) == positive;
}
Token *
_PyPegen_expect_token(Parser *p, int type)
{
if (p->mark == p->fill) {
if (_PyPegen_fill_token(p) < 0) {
p->error_indicator = 1;
return NULL;
}
}
Token *t = p->tokens[p->mark];
if (t->type != type) {
return NULL;
}
p->mark += 1;
return t;
}
expr_ty
_PyPegen_expect_soft_keyword(Parser *p, const char *keyword)
{
if (p->mark == p->fill) {
if (_PyPegen_fill_token(p) < 0) {
p->error_indicator = 1;
return NULL;
}
}
Token *t = p->tokens[p->mark];
if (t->type != NAME) {
return NULL;
}
char* s = PyBytes_AsString(t->bytes);
if (!s) {
p->error_indicator = 1;
return NULL;
}
if (strcmp(s, keyword) != 0) {
return NULL;
}
return _PyPegen_name_token(p);
}
Token *
_PyPegen_get_last_nonnwhitespace_token(Parser *p)
{
assert(p->mark >= 0);
Token *token = NULL;
for (int m = p->mark - 1; m >= 0; m--) {
token = p->tokens[m];
if (token->type != ENDMARKER && (token->type < NEWLINE || token->type > DEDENT)) {
break;
}
}
return token;
}
expr_ty
_PyPegen_name_token(Parser *p)
{
Token *t = _PyPegen_expect_token(p, NAME);
if (t == NULL) {
return NULL;
}
char* s = PyBytes_AsString(t->bytes);
if (!s) {
p->error_indicator = 1;
return NULL;
}
PyObject *id = _PyPegen_new_identifier(p, s);
if (id == NULL) {
p->error_indicator = 1;
return NULL;
}
return Name(id, Load, t->lineno, t->col_offset, t->end_lineno, t->end_col_offset,
p->arena);
}
void *
_PyPegen_string_token(Parser *p)
{
return _PyPegen_expect_token(p, STRING);
}
static PyObject *
parsenumber_raw(const char *s)
{
const char *end;
long x;
double dx;
Py_complex compl;
int imflag;
assert(s != NULL);
errno = 0;
end = s + strlen(s) - 1;
imflag = *end == 'j' || *end == 'J';
if (s[0] == '0') {
x = (long)PyOS_strtoul(s, (char **)&end, 0);
if (x < 0 && errno == 0) {
return PyLong_FromString(s, (char **)0, 0);
}
}
else {
x = PyOS_strtol(s, (char **)&end, 0);
}
if (*end == '\0') {
if (errno != 0) {
return PyLong_FromString(s, (char **)0, 0);
}
return PyLong_FromLong(x);
}
/* XXX Huge floats may silently fail */
if (imflag) {
compl.real = 0.;
compl.imag = PyOS_string_to_double(s, (char **)&end, NULL);
if (compl.imag == -1.0 && PyErr_Occurred()) {
return NULL;
}
return PyComplex_FromCComplex(compl);
}
dx = PyOS_string_to_double(s, NULL, NULL);
if (dx == -1.0 && PyErr_Occurred()) {
return NULL;
}
return PyFloat_FromDouble(dx);
}
static PyObject *
parsenumber(const char *s)
{
char *dup;
char *end;
PyObject *res = NULL;
assert(s != NULL);
if (strchr(s, '_') == NULL) {
return parsenumber_raw(s);
}
/* Create a duplicate without underscores. */
dup = PyMem_Malloc(strlen(s) + 1);
if (dup == NULL) {
return PyErr_NoMemory();
}
end = dup;
for (; *s; s++) {
if (*s != '_') {
*end++ = *s;
}
}
*end = '\0';
res = parsenumber_raw(dup);
PyMem_Free(dup);
return res;
}
expr_ty
_PyPegen_number_token(Parser *p)
{
Token *t = _PyPegen_expect_token(p, NUMBER);
if (t == NULL) {
return NULL;
}
char *num_raw = PyBytes_AsString(t->bytes);
if (num_raw == NULL) {
p->error_indicator = 1;
return NULL;
}
if (p->feature_version < 6 && strchr(num_raw, '_') != NULL) {
p->error_indicator = 1;
return RAISE_SYNTAX_ERROR("Underscores in numeric literals are only supported "
"in Python 3.6 and greater");
}
PyObject *c = parsenumber(num_raw);
if (c == NULL) {
p->error_indicator = 1;
return NULL;
}
if (PyArena_AddPyObject(p->arena, c) < 0) {
Py_DECREF(c);
p->error_indicator = 1;
return NULL;
}
return Constant(c, NULL, t->lineno, t->col_offset, t->end_lineno, t->end_col_offset,
p->arena);
}
static int // bool
newline_in_string(Parser *p, const char *cur)
{
for (const char *c = cur; c >= p->tok->buf; c--) {
if (*c == '\'' || *c == '"') {
return 1;
}
}
return 0;
}
/* Check that the source for a single input statement really is a single
statement by looking at what is left in the buffer after parsing.
Trailing whitespace and comments are OK. */
static int // bool
bad_single_statement(Parser *p)
{
const char *cur = strchr(p->tok->buf, '\n');
/* Newlines are allowed if preceded by a line continuation character
or if they appear inside a string. */
if (!cur || (cur != p->tok->buf && *(cur - 1) == '\\')
|| newline_in_string(p, cur)) {
return 0;
}
char c = *cur;