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cpython/Parser/pegen.c

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#include <Python.h>
#include "pycore_ast.h" // _PyAST_Validate(),
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "pycore_pyerrors.h" // PyExc_IncompleteInputError
#include <errcode.h>
#include "lexer/lexer.h"
#include "tokenizer/tokenizer.h"
#include "pegen.h"
// Internal parser functions
asdl_stmt_seq*
_PyPegen_interactive_exit(Parser *p)
{
if (p->errcode) {
*(p->errcode) = E_EOF;
}
return NULL;
}
Py_ssize_t
_PyPegen_byte_offset_to_character_offset_line(PyObject *line, Py_ssize_t col_offset, Py_ssize_t end_col_offset)
{
const char *data = PyUnicode_AsUTF8(line);
Py_ssize_t len = 0;
while (col_offset < end_col_offset) {
Py_UCS4 ch = data[col_offset];
if (ch < 0x80) {
col_offset += 1;
} else if ((ch & 0xe0) == 0xc0) {
col_offset += 2;
} else if ((ch & 0xf0) == 0xe0) {
col_offset += 3;
} else if ((ch & 0xf8) == 0xf0) {
col_offset += 4;
} else {
PyErr_SetString(PyExc_ValueError, "Invalid UTF-8 sequence");
return -1;
}
len++;
}
return len;
}
Py_ssize_t
_PyPegen_byte_offset_to_character_offset_raw(const char* str, Py_ssize_t col_offset)
{
Py_ssize_t len = strlen(str);
if (col_offset > len + 1) {
col_offset = len + 1;
}
assert(col_offset >= 0);
PyObject *text = PyUnicode_DecodeUTF8(str, col_offset, "replace");
if (!text) {
return -1;
}
Py_ssize_t size = PyUnicode_GET_LENGTH(text);
Py_DECREF(text);
return size;
}
Py_ssize_t
_PyPegen_byte_offset_to_character_offset(PyObject *line, Py_ssize_t col_offset)
{
const char *str = PyUnicode_AsUTF8(line);
if (!str) {
return -1;
}
return _PyPegen_byte_offset_to_character_offset_raw(str, col_offset);
}
// 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);
}
static int
init_normalization(Parser *p)
{
if (p->normalize) {
return 1;
}
p->normalize = _PyImport_GetModuleAttrString("unicodedata", "normalize");
if (!p->normalize)
{
return 0;
}
return 1;
}
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);
}
static int
_get_keyword_or_name_type(Parser *p, struct token *new_token)
{
int name_len = new_token->end_col_offset - new_token->col_offset;
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, new_token->start, name_len) == 0) {
return k->type;
}
}
return NAME;
}
static int
initialize_token(Parser *p, Token *parser_token, struct token *new_token, int token_type) {
assert(parser_token != NULL);
parser_token->type = (token_type == NAME) ? _get_keyword_or_name_type(p, new_token) : token_type;
parser_token->bytes = PyBytes_FromStringAndSize(new_token->start, new_token->end - new_token->start);
if (parser_token->bytes == NULL) {
return -1;
}
if (_PyArena_AddPyObject(p->arena, parser_token->bytes) < 0) {
Py_DECREF(parser_token->bytes);
return -1;
}
parser_token->metadata = NULL;
if (new_token->metadata != NULL) {
if (_PyArena_AddPyObject(p->arena, new_token->metadata) < 0) {
Py_DECREF(parser_token->metadata);
return -1;
}
parser_token->metadata = new_token->metadata;
new_token->metadata = NULL;
}
parser_token->level = new_token->level;
parser_token->lineno = new_token->lineno;
parser_token->col_offset = p->tok->lineno == p->starting_lineno ? p->starting_col_offset + new_token->col_offset
: new_token->col_offset;
parser_token->end_lineno = new_token->end_lineno;
parser_token->end_col_offset = p->tok->lineno == p->starting_lineno ? p->starting_col_offset + new_token->end_col_offset
: new_token->end_col_offset;
p->fill += 1;
if (token_type == ERRORTOKEN && p->tok->done == E_DECODE) {
return _Pypegen_raise_decode_error(p);
}
return (token_type == ERRORTOKEN ? _Pypegen_tokenizer_error(p) : 0);
}
static int
_resize_tokens_array(Parser *p) {
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_Calloc(1, sizeof(Token));
if (p->tokens[i] == NULL) {
p->size = i; // Needed, in order to cleanup correctly after parser fails
PyErr_NoMemory();
return -1;
}
}
p->size = newsize;
return 0;
}
int
_PyPegen_fill_token(Parser *p)
{
struct token new_token;
_PyToken_Init(&new_token);
int type = _PyTokenizer_Get(p->tok, &new_token);
// Record and skip '# type: ignore' comments
while (type == TYPE_IGNORE) {
Py_ssize_t len = new_token.end_col_offset - new_token.col_offset;
char *tag = PyMem_Malloc(len + 1);
if (tag == NULL) {
PyErr_NoMemory();
goto error;
}
strncpy(tag, new_token.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();
goto error;
}
type = _PyTokenizer_Get(p->tok, &new_token);
}
// If we have reached the end and we are in single input mode we need to insert a newline and reset the parsing
if (p->start_rule == Py_single_input && type == ENDMARKER && 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;
}
// Check if we are at the limit of the token array capacity and resize if needed
if ((p->fill == p->size) && (_resize_tokens_array(p) != 0)) {
goto error;
}
Token *t = p->tokens[p->fill];
return initialize_token(p, t, &new_token, type);
error:
_PyToken_Free(&new_token);
return -1;
}
#if defined(Py_DEBUG)
// Instrumentation to count the effectiveness of memoization.
// The array counts the number of tokens skipped by memoization,
// indexed by type.
#define NSTATISTICS _PYPEGEN_NSTATISTICS
#define memo_statistics _PyRuntime.parser.memo_statistics
#ifdef Py_GIL_DISABLED
#define MUTEX_LOCK() PyMutex_Lock(&_PyRuntime.parser.mutex)
#define MUTEX_UNLOCK() PyMutex_Unlock(&_PyRuntime.parser.mutex)
#else
#define MUTEX_LOCK()
#define MUTEX_UNLOCK()
#endif
void
_PyPegen_clear_memo_statistics(void)
{
MUTEX_LOCK();
for (int i = 0; i < NSTATISTICS; i++) {
memo_statistics[i] = 0;
}
MUTEX_UNLOCK();
}
PyObject *
_PyPegen_get_memo_statistics(void)
{
PyObject *ret = PyList_New(NSTATISTICS);
if (ret == NULL) {
return NULL;
}
MUTEX_LOCK();
for (int i = 0; i < NSTATISTICS; i++) {
PyObject *value = PyLong_FromLong(memo_statistics[i]);
if (value == NULL) {
MUTEX_UNLOCK();
Py_DECREF(ret);
return NULL;
}
// PyList_SetItem borrows a reference to value.
if (PyList_SetItem(ret, i, value) < 0) {
MUTEX_UNLOCK();
Py_DECREF(ret);
return NULL;
}
}
MUTEX_UNLOCK();
return ret;
}
#endif
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 defined(Py_DEBUG)
if (0 <= type && type < NSTATISTICS) {
long count = m->mark - p->mark;
// A memoized negative result counts for one.
if (count <= 0) {
count = 1;
}
MUTEX_LOCK();
memo_statistics[type] += count;
MUTEX_UNLOCK();
}
#endif
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;
}
void*
_PyPegen_expect_forced_result(Parser *p, void* result, const char* expected) {
if (p->error_indicator == 1) {
return NULL;
}
if (result == NULL) {
RAISE_SYNTAX_ERROR("expected (%s)", expected);
return NULL;
}
return result;
}
Token *
_PyPegen_expect_forced_token(Parser *p, int type, const char* expected) {
if (p->error_indicator == 1) {
return NULL;
}
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) {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(t, "expected '%s'", expected);
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;
}
const 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;
}
PyObject *
_PyPegen_new_identifier(Parser *p, const 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))
{
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};
PyObject *id2 = PyObject_Vectorcall(p->normalize, args, 2, NULL);
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;
}
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyUnicode_InternImmortal(interp, &id);
if (_PyArena_AddPyObject(p->arena, id) < 0)
{
Py_DECREF(id);
goto error;
}
return id;
error:
p->error_indicator = 1;
return NULL;
}
static expr_ty
_PyPegen_name_from_token(Parser *p, Token* t)
{
if (t == NULL) {
return NULL;
}
const 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 _PyAST_Name(id, Load, t->lineno, t->col_offset, t->end_lineno,
t->end_col_offset, p->arena);
}
expr_ty
_PyPegen_name_token(Parser *p)
{
Token *t = _PyPegen_expect_token(p, NAME);
return _PyPegen_name_from_token(p, t);
}
void *
_PyPegen_string_token(Parser *p)
{
return _PyPegen_expect_token(p, STRING);
}
expr_ty _PyPegen_soft_keyword_token(Parser *p) {
Token *t = _PyPegen_expect_token(p, NAME);
if (t == NULL) {
return NULL;
}
char *the_token;
Py_ssize_t size;
PyBytes_AsStringAndSize(t->bytes, &the_token, &size);
for (char **keyword = p->soft_keywords; *keyword != NULL; keyword++) {
if (strncmp(*keyword, the_token, size) == 0) {
return _PyPegen_name_from_token(p, t);
}
}
return NULL;
}
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;
}
const 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;
PyThreadState *tstate = _PyThreadState_GET();
// The only way a ValueError should happen in _this_ code is via
// PyLong_FromString hitting a length limit.
if (tstate->current_exception != NULL &&
Py_TYPE(tstate->current_exception) == (PyTypeObject *)PyExc_ValueError
) {
PyObject *exc = PyErr_GetRaisedException();
/* Intentionally omitting columns to avoid a wall of 1000s of '^'s
* on the error message. Nobody is going to overlook their huge
* numeric literal once given the line. */
RAISE_ERROR_KNOWN_LOCATION(
p, PyExc_SyntaxError,
t->lineno, -1 /* col_offset */,
t->end_lineno, -1 /* end_col_offset */,
"%S - Consider hexadecimal for huge integer literals "
"to avoid decimal conversion limits.",
exc);
Py_DECREF(exc);
}
return NULL;
}
if (_PyArena_AddPyObject(p->arena, c) < 0) {
Py_DECREF(c);
p->error_indicator = 1;
return NULL;
}
return _PyAST_Constant(c, NULL, t->lineno, t->col_offset, t->end_lineno,
t->end_col_offset, p->arena);
}
/* 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)
{
char *cur = p->tok->cur;
char c = *cur;
for (;;) {
while (c == ' ' || c == '\t' || c == '\n' || c == '\014') {
c = *++cur;
}
if (!c) {
return 0;
}
if (c != '#') {
return 1;
}
/* Suck up comment. */
while (c && c != '\n') {
c = *++cur;
}
}
}
static int
compute_parser_flags(PyCompilerFlags *flags)
{
int parser_flags = 0;
if (!flags) {
return 0;
}
if (flags->cf_flags & PyCF_DONT_IMPLY_DEDENT) {
parser_flags |= PyPARSE_DONT_IMPLY_DEDENT;
}
if (flags->cf_flags & PyCF_IGNORE_COOKIE) {
parser_flags |= PyPARSE_IGNORE_COOKIE;
}
if (flags->cf_flags & CO_FUTURE_BARRY_AS_BDFL) {
parser_flags |= PyPARSE_BARRY_AS_BDFL;
}
if (flags->cf_flags & PyCF_TYPE_COMMENTS) {
parser_flags |= PyPARSE_TYPE_COMMENTS;
}
if (flags->cf_flags & PyCF_ALLOW_INCOMPLETE_INPUT) {
parser_flags |= PyPARSE_ALLOW_INCOMPLETE_INPUT;
}
return parser_flags;
}
// Parser API
Parser *
_PyPegen_Parser_New(struct tok_state *tok, int start_rule, int flags,
int feature_version, int *errcode, PyArena *arena)
{
Parser *p = PyMem_Malloc(sizeof(Parser));
if (p == NULL) {
return (Parser *) PyErr_NoMemory();
}
assert(tok != NULL);
tok->type_comments = (flags & PyPARSE_TYPE_COMMENTS) > 0;
p->tok = tok;
p->keywords = NULL;
p->n_keyword_lists = -1;
p->soft_keywords = NULL;
p->tokens = PyMem_Malloc(sizeof(Token *));
if (!p->tokens) {
PyMem_Free(p);
return (Parser *) PyErr_NoMemory();
}
p->tokens[0] = PyMem_Calloc(1, sizeof(Token));
if (!p->tokens[0]) {
PyMem_Free(p->tokens);
PyMem_Free(p);
return (Parser *) PyErr_NoMemory();
}
if (!growable_comment_array_init(&p->type_ignore_comments, 10)) {
PyMem_Free(p->tokens[0]);
PyMem_Free(p->tokens);
PyMem_Free(p);
return (Parser *) PyErr_NoMemory();
}
p->mark = 0;
p->fill = 0;
p->size = 1;
p->errcode = errcode;
p->arena = arena;
p->start_rule = start_rule;
p->parsing_started = 0;
p->normalize = NULL;
p->error_indicator = 0;
p->starting_lineno = 0;
p->starting_col_offset = 0;
p->flags = flags;
p->feature_version = feature_version;
p->known_err_token = NULL;
p->level = 0;
p->call_invalid_rules = 0;
#ifdef Py_DEBUG
p->debug = _Py_GetConfig()->parser_debug;
#endif
return p;
}
void
_PyPegen_Parser_Free(Parser *p)
{
Py_XDECREF(p->normalize);
for (int i = 0; i < p->size; i++) {
PyMem_Free(p->tokens[i]);
}
PyMem_Free(p->tokens);
growable_comment_array_deallocate(&p->type_ignore_comments);
PyMem_Free(p);
}
static void
reset_parser_state_for_error_pass(Parser *p)
{
for (int i = 0; i < p->fill; i++) {
p->tokens[i]->memo = NULL;
}
p->mark = 0;
p->call_invalid_rules = 1;
// Don't try to get extra tokens in interactive mode when trying to
// raise specialized errors in the second pass.
p->tok->interactive_underflow = IUNDERFLOW_STOP;
}
static inline int
_is_end_of_source(Parser *p) {
int err = p->tok->done;
return err == E_EOF || err == E_EOFS || err == E_EOLS;
}
void *
_PyPegen_run_parser(Parser *p)
{
void *res = _PyPegen_parse(p);
assert(p->level == 0);
if (res == NULL) {
if ((p->flags & PyPARSE_ALLOW_INCOMPLETE_INPUT) && _is_end_of_source(p)) {
PyErr_Clear();
return _PyPegen_raise_error(p, PyExc_IncompleteInputError, 0, "incomplete input");
}
if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_SyntaxError)) {
return NULL;
}
// Make a second parser pass. In this pass we activate heavier and slower checks
// to produce better error messages and more complete diagnostics. Extra "invalid_*"
// rules will be active during parsing.
Token *last_token = p->tokens[p->fill - 1];
reset_parser_state_for_error_pass(p);
_PyPegen_parse(p);
// Set SyntaxErrors accordingly depending on the parser/tokenizer status at the failure
// point.
_Pypegen_set_syntax_error(p, last_token);
return NULL;
}
if (p->start_rule == Py_single_input && bad_single_statement(p)) {
p->tok->done = E_BADSINGLE; // This is not necessary for now, but might be in the future
return RAISE_SYNTAX_ERROR("multiple statements found while compiling a single statement");
}
// test_peg_generator defines _Py_TEST_PEGEN to not call PyAST_Validate()
#if defined(Py_DEBUG) && !defined(_Py_TEST_PEGEN)
if (p->start_rule == Py_single_input ||
p->start_rule == Py_file_input ||
p->start_rule == Py_eval_input)
{
if (!_PyAST_Validate(res)) {
return NULL;
}
}
#endif
return res;
}
mod_ty
_PyPegen_run_parser_from_file_pointer(FILE *fp, int start_rule, PyObject *filename_ob,
const char *enc, const char *ps1, const char *ps2,
PyCompilerFlags *flags, int *errcode,
PyObject **interactive_src, PyArena *arena)
{
struct tok_state *tok = _PyTokenizer_FromFile(fp, enc, ps1, ps2);
if (tok == NULL) {
if (PyErr_Occurred()) {
_PyPegen_raise_tokenizer_init_error(filename_ob);
return NULL;
}
return NULL;
}
if (!tok->fp || ps1 != NULL || ps2 != NULL ||
PyUnicode_CompareWithASCIIString(filename_ob, "<stdin>") == 0) {
tok->fp_interactive = 1;
}
// This transfers the ownership to the tokenizer
tok->filename = Py_NewRef(filename_ob);
// From here on we need to clean up even if there's an error
mod_ty result = NULL;
int parser_flags = compute_parser_flags(flags);
Parser *p = _PyPegen_Parser_New(tok, start_rule, parser_flags, PY_MINOR_VERSION,
errcode, arena);
if (p == NULL) {
goto error;
}
result = _PyPegen_run_parser(p);
_PyPegen_Parser_Free(p);
if (tok->fp_interactive && tok->interactive_src_start && result && interactive_src != NULL) {
*interactive_src = PyUnicode_FromString(tok->interactive_src_start);
if (!interactive_src || _PyArena_AddPyObject(arena, *interactive_src) < 0) {
Py_XDECREF(interactive_src);
result = NULL;
goto error;
}
}
error:
_PyTokenizer_Free(tok);
return result;
}
mod_ty
_PyPegen_run_parser_from_string(const char *str, int start_rule, PyObject *filename_ob,
PyCompilerFlags *flags, PyArena *arena)
{
int exec_input = start_rule == Py_file_input;
struct tok_state *tok;
if (flags != NULL && flags->cf_flags & PyCF_IGNORE_COOKIE) {
tok = _PyTokenizer_FromUTF8(str, exec_input, 0);
} else {
tok = _PyTokenizer_FromString(str, exec_input, 0);
}
if (tok == NULL) {
if (PyErr_Occurred()) {
_PyPegen_raise_tokenizer_init_error(filename_ob);
}
return NULL;
}
// This transfers the ownership to the tokenizer
tok->filename = Py_NewRef(filename_ob);
// We need to clear up from here on
mod_ty result = NULL;
int parser_flags = compute_parser_flags(flags);
int feature_version = flags && (flags->cf_flags & PyCF_ONLY_AST) ?
flags->cf_feature_version : PY_MINOR_VERSION;
Parser *p = _PyPegen_Parser_New(tok, start_rule, parser_flags, feature_version,
NULL, arena);
if (p == NULL) {
goto error;
}
result = _PyPegen_run_parser(p);
_PyPegen_Parser_Free(p);
error:
_PyTokenizer_Free(tok);
return result;
}
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