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cpython/Parser/pegen.c

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#include <Python.h>
#include "pycore_ast.h" // _PyAST_Validate()
#include <errcode.h>
#include "tokenizer.h"
#include "pegen.h"
#include "string_parser.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 _PyAST_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;
}
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 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 "expression";
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 literal";
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 inline void
raise_unclosed_parentheses_error(Parser *p) {
int error_lineno = p->tok->parenlinenostack[p->tok->level-1];
int error_col = p->tok->parencolstack[p->tok->level-1];
RAISE_ERROR_KNOWN_LOCATION(p, PyExc_SyntaxError,
error_lineno, error_col, error_lineno, -1,
"'%c' was never closed",
p->tok->parenstack[p->tok->level-1]);
}
static void
raise_tokenizer_init_error(PyObject *filename)
{
if (!(PyErr_ExceptionMatches(PyExc_LookupError)
|| 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_EOF:
if (p->tok->level) {
raise_unclosed_parentheses_error(p);
} else {
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 = strlen(strtok(p->tok->buf, "\n")) - 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, p->tok->lineno, -1, 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;
Py_ssize_t end_col_offset = -1;
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;
}
if (t->end_col_offset != -1) {
end_col_offset = t->end_col_offset + 1;
}
va_list va;
va_start(va, errmsg);
_PyPegen_raise_error_known_location(p, errtype, t->lineno, col_offset, t->end_lineno, end_col_offset, errmsg, va);
va_end(va);
return NULL;
}
static PyObject *
get_error_line(Parser *p, Py_ssize_t lineno)
{
/* If the file descriptor is interactive, the source lines of the current
* (multi-line) statement are stored in p->tok->interactive_src_start.
* If not, we're parsing from a string, which means that the whole source
* is stored in p->tok->str. */
assert(p->tok->fp == NULL || p->tok->fp == stdin);
char *cur_line = p->tok->fp_interactive ? p->tok->interactive_src_start : p->tok->str;
for (int i = 0; i < lineno - 1; i++) {
cur_line = strchr(cur_line, '\n') + 1;
}
char *next_newline;
if ((next_newline = strchr(cur_line, '\n')) == NULL) { // This is the last line
next_newline = cur_line + strlen(cur_line);
}
return PyUnicode_DecodeUTF8(cur_line, next_newline - cur_line, "replace");
}
void *
_PyPegen_raise_error_known_location(Parser *p, PyObject *errtype,
Py_ssize_t lineno, Py_ssize_t col_offset,
Py_ssize_t end_lineno, Py_ssize_t end_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 (end_lineno == CURRENT_POS) {
end_lineno = p->tok->lineno;
}
if (end_col_offset == CURRENT_POS) {
end_col_offset = p->tok->cur - p->tok->line_start;
}
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_Malloc(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->tok->fp_interactive) {
error_line = get_error_line(p, lineno);
}
else if (p->start_rule == Py_file_input) {
error_line = PyErr_ProgramTextObject(p->tok->filename, (int) lineno);
}
if (!error_line) {
/* PyErr_ProgramTextObject was not called or returned NULL. If it was not called,
then we need to find the error line from some other source, because
p->start_rule != Py_file_input. If it returned NULL, then it either unexpectedly
failed or we're parsing from a string or the REPL. There's a third edge case where
we're actually parsing from a file, which has an E_EOF SyntaxError and in that case
`PyErr_ProgramTextObject` fails because lineno points to last_file_line + 1, which
does not physically exist */
assert(p->tok->fp == NULL || p->tok->fp == stdin || p->tok->done == E_EOF);
if (p->tok->lineno <= lineno) {
Py_ssize_t size = p->tok->inp - p->tok->buf;
error_line = PyUnicode_DecodeUTF8(p->tok->buf, size, "replace");
}
else {
error_line = get_error_line(p, lineno);
}
if (!error_line) {
goto error;
}
}
if (p->start_rule == Py_fstring_input) {
col_offset -= p->starting_col_offset;
end_col_offset -= p->starting_col_offset;
}
Py_ssize_t col_number = col_offset;
Py_ssize_t end_col_number = end_col_offset;
if (p->tok->encoding != NULL) {
col_number = byte_offset_to_character_offset(error_line, col_offset);
end_col_number = end_col_number > 0 ?
byte_offset_to_character_offset(error_line, end_col_offset) :
end_col_number;
}
tmp = Py_BuildValue("(OiiNii)", p->tok->filename, lineno, col_number, error_line, end_lineno, end_col_number);
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_Free((void *)errmsg);
}
return NULL;
error:
Py_XDECREF(errstr);
Py_XDECREF(error_line);
if (p->start_rule == Py_fstring_input) {
PyMem_Free((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 = _PyAST_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);
}
static int
initialize_token(Parser *p, Token *token, const char *start, const char *end, int token_type) {
assert(token != NULL);
token->type = (token_type == NAME) ? _get_keyword_or_name_type(p, start, (int)(end - start)) : token_type;
token->bytes = PyBytes_FromStringAndSize(start, end - start);
if (token->bytes == NULL) {
return -1;
}
if (_PyArena_AddPyObject(p->arena, token->bytes) < 0) {
Py_DECREF(token->bytes);
return -1;
}
const char *line_start = token_type == STRING ? p->tok->multi_line_start : p->tok->line_start;
int lineno = token_type == STRING ? p->tok->first_lineno : p->tok->lineno;
int end_lineno = p->tok->lineno;
int col_offset = (start != NULL && start >= line_start) ? (int)(start - line_start) : -1;
int end_col_offset = (end != NULL && end >= p->tok->line_start) ? (int)(end - p->tok->line_start) : -1;
token->lineno = p->starting_lineno + lineno;
token->col_offset = p->tok->lineno == 1 ? p->starting_col_offset + col_offset : col_offset;
token->end_lineno = p->starting_lineno + end_lineno;
token->end_col_offset = p->tok->lineno == 1 ? p->starting_col_offset + end_col_offset : end_col_offset;
p->fill += 1;
if (token_type == ERRORTOKEN && p->tok->done == E_DECODE) {
return raise_decode_error(p);
}
return (token_type == ERRORTOKEN ? 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)
{
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 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)) {
return -1;
}
Token *t = p->tokens[p->fill];
return initialize_token(p, t, start, end, type);
}
#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 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;
}
#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;
}
memo_statistics[type] += count;
}
#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;
}
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;
}
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 _PyAST_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);
}
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_token(p);
}
}
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;
}
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 _PyAST_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;
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;
}
}
}
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 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_ONLY_AST) && flags->cf_feature_version < 7) {
parser_flags |= PyPARSE_ASYNC_HACKS;
}
return parser_flags;
}
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;
tok->async_hacks = (flags & PyPARSE_ASYNC_HACKS) > 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) {
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;
return p;
}
static void
reset_parser_state(Parser *p)
{
for (int i = 0; i < p->fill; i++) {
p->tokens[i]->memo = NULL;
}
p->mark = 0;
p->call_invalid_rules = 1;
}
static int
_PyPegen_check_tokenizer_errors(Parser *p) {
// Tokenize the whole input to see if there are any tokenization
// errors such as mistmatching parentheses. These will get priority
// over generic syntax errors only if the line number of the error is
// before the one that we had for the generic error.
// We don't want to tokenize to the end for interactive input
if (p->tok->prompt != NULL) {
return 0;
}
Token *current_token = p->known_err_token != NULL ? p->known_err_token : p->tokens[p->fill - 1];
Py_ssize_t current_err_line = current_token->lineno;
for (;;) {
const char *start;
const char *end;
switch (PyTokenizer_Get(p->tok, &start, &end)) {
case ERRORTOKEN:
if (p->tok->level != 0) {
int error_lineno = p->tok->parenlinenostack[p->tok->level-1];
if (current_err_line > error_lineno) {
raise_unclosed_parentheses_error(p);
return -1;
}
}
break;
case ENDMARKER:
break;
default:
continue;
}
break;
}
return 0;
}
void *
_PyPegen_run_parser(Parser *p)
{
void *res = _PyPegen_parse(p);
if (res == NULL) {
reset_parser_state(p);
_PyPegen_parse(p);
if (PyErr_Occurred()) {
return NULL;
}
if (p->fill == 0) {
RAISE_SYNTAX_ERROR("error at start before reading any input");
}
else if (p->tok->done == E_EOF) {
if (p->tok->level) {
raise_unclosed_parentheses_error(p);
} else {
RAISE_SYNTAX_ERROR("unexpected EOF while parsing");
}
}
else {
if (p->tokens[p->fill-1]->type == INDENT) {
RAISE_INDENTATION_ERROR("unexpected indent");
}
else if (p->tokens[p->fill-1]->type == DEDENT) {
RAISE_INDENTATION_ERROR("unexpected unindent");
}
else {
RAISE_SYNTAX_ERROR("invalid syntax");
// _PyPegen_check_tokenizer_errors will override the existing
// generic SyntaxError we just raised if errors are found.
_PyPegen_check_tokenizer_errors(p);
}
}
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, PyArena *arena)
{
struct tok_state *tok = PyTokenizer_FromFile(fp, enc, ps1, ps2);
if (tok == NULL) {
if (PyErr_Occurred()) {
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 = filename_ob;
Py_INCREF(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);
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);
} else {
tok = PyTokenizer_FromString(str, exec_input);
}
if (tok == NULL) {
if (PyErr_Occurred()) {
raise_tokenizer_init_error(filename_ob);
}
return NULL;
}
// This transfers the ownership to the tokenizer
tok->filename = filename_ob;
Py_INCREF(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;
}
asdl_stmt_seq*
_PyPegen_interactive_exit(Parser *p)
{
if (p->errcode) {
*(p->errcode) = E_EOF;
}
return NULL;
}
/* Creates a single-element asdl_seq* that contains a */
asdl_seq *
_PyPegen_singleton_seq(Parser *p, void *a)
{
assert(a != NULL);
asdl_seq *seq = (asdl_seq*)_Py_asdl_generic_seq_new(1, p->arena);
if (!seq) {
return NULL;
}
asdl_seq_SET_UNTYPED(seq, 0, a);
return seq;
}
/* Creates a copy of seq and prepends a to it */
asdl_seq *
_PyPegen_seq_insert_in_front(Parser *p, void *a, asdl_seq *seq)
{
assert(a != NULL);
if (!seq) {
return _PyPegen_singleton_seq(p, a);
}
asdl_seq *new_seq = (asdl_seq*)_Py_asdl_generic_seq_new(asdl_seq_LEN(seq) + 1, p->arena);
if (!new_seq) {
return NULL;
}
asdl_seq_SET_UNTYPED(new_seq, 0, a);
for (Py_ssize_t i = 1, l = asdl_seq_LEN(new_seq); i < l; i++) {
asdl_seq_SET_UNTYPED(new_seq, i, asdl_seq_GET_UNTYPED(seq, i - 1));
}
return new_seq;
}
/* Creates a copy of seq and appends a to it */
asdl_seq *
_PyPegen_seq_append_to_end(Parser *p, asdl_seq *seq, void *a)
{
assert(a != NULL);
if (!seq) {
return _PyPegen_singleton_seq(p, a);
}
asdl_seq *new_seq = (asdl_seq*)_Py_asdl_generic_seq_new(asdl_seq_LEN(seq) + 1, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0, l = asdl_seq_LEN(new_seq); i + 1 < l; i++) {
asdl_seq_SET_UNTYPED(new_seq, i, asdl_seq_GET_UNTYPED(seq, i));
}
asdl_seq_SET_UNTYPED(new_seq, asdl_seq_LEN(new_seq) - 1, a);
return new_seq;
}
static Py_ssize_t
_get_flattened_seq_size(asdl_seq *seqs)
{
Py_ssize_t size = 0;
for (Py_ssize_t i = 0, l = asdl_seq_LEN(seqs); i < l; i++) {
asdl_seq *inner_seq = asdl_seq_GET_UNTYPED(seqs, i);
size += asdl_seq_LEN(inner_seq);
}
return size;
}
/* Flattens an asdl_seq* of asdl_seq*s */
asdl_seq *
_PyPegen_seq_flatten(Parser *p, asdl_seq *seqs)
{
Py_ssize_t flattened_seq_size = _get_flattened_seq_size(seqs);
assert(flattened_seq_size > 0);
asdl_seq *flattened_seq = (asdl_seq*)_Py_asdl_generic_seq_new(flattened_seq_size, p->arena);
if (!flattened_seq) {
return NULL;
}
int flattened_seq_idx = 0;
for (Py_ssize_t i = 0, l = asdl_seq_LEN(seqs); i < l; i++) {
asdl_seq *inner_seq = asdl_seq_GET_UNTYPED(seqs, i);
for (Py_ssize_t j = 0, li = asdl_seq_LEN(inner_seq); j < li; j++) {
asdl_seq_SET_UNTYPED(flattened_seq, flattened_seq_idx++, asdl_seq_GET_UNTYPED(inner_seq, j));
}
}
assert(flattened_seq_idx == flattened_seq_size);
return flattened_seq;
}
void *
_PyPegen_seq_last_item(asdl_seq *seq)
{
Py_ssize_t len = asdl_seq_LEN(seq);
return asdl_seq_GET_UNTYPED(seq, len - 1);
}
/* Creates a new name of the form <first_name>.<second_name> */
expr_ty
_PyPegen_join_names_with_dot(Parser *p, expr_ty first_name, expr_ty second_name)
{
assert(first_name != NULL && second_name != NULL);
PyObject *first_identifier = first_name->v.Name.id;
PyObject *second_identifier = second_name->v.Name.id;
if (PyUnicode_READY(first_identifier) == -1) {
return NULL;
}
if (PyUnicode_READY(second_identifier) == -1) {
return NULL;
}
const char *first_str = PyUnicode_AsUTF8(first_identifier);
if (!first_str) {
return NULL;
}
const char *second_str = PyUnicode_AsUTF8(second_identifier);
if (!second_str) {
return NULL;
}
Py_ssize_t len = strlen(first_str) + strlen(second_str) + 1; // +1 for the dot
PyObject *str = PyBytes_FromStringAndSize(NULL, len);
if (!str) {
return NULL;
}
char *s = PyBytes_AS_STRING(str);
if (!s) {
return NULL;
}
strcpy(s, first_str);
s += strlen(first_str);
*s++ = '.';
strcpy(s, second_str);
s += strlen(second_str);
*s = '\0';
PyObject *uni = PyUnicode_DecodeUTF8(PyBytes_AS_STRING(str), PyBytes_GET_SIZE(str), NULL);
Py_DECREF(str);
if (!uni) {
return NULL;
}
PyUnicode_InternInPlace(&uni);
if (_PyArena_AddPyObject(p->arena, uni) < 0) {
Py_DECREF(uni);
return NULL;
}
return _PyAST_Name(uni, Load, EXTRA_EXPR(first_name, second_name));
}
/* Counts the total number of dots in seq's tokens */
int
_PyPegen_seq_count_dots(asdl_seq *seq)
{
int number_of_dots = 0;
for (Py_ssize_t i = 0, l = asdl_seq_LEN(seq); i < l; i++) {
Token *current_expr = asdl_seq_GET_UNTYPED(seq, i);
switch (current_expr->type) {
case ELLIPSIS:
number_of_dots += 3;
break;
case DOT:
number_of_dots += 1;
break;
default:
Py_UNREACHABLE();
}
}
return number_of_dots;
}
/* Creates an alias with '*' as the identifier name */
alias_ty
_PyPegen_alias_for_star(Parser *p, int lineno, int col_offset, int end_lineno,
int end_col_offset, PyArena *arena) {
PyObject *str = PyUnicode_InternFromString("*");
if (!str) {
return NULL;
}
if (_PyArena_AddPyObject(p->arena, str) < 0) {
Py_DECREF(str);
return NULL;
}
return _PyAST_alias(str, NULL, lineno, col_offset, end_lineno, end_col_offset, arena);
}
/* Creates a new asdl_seq* with the identifiers of all the names in seq */
asdl_identifier_seq *
_PyPegen_map_names_to_ids(Parser *p, asdl_expr_seq *seq)
{
Py_ssize_t len = asdl_seq_LEN(seq);
assert(len > 0);
asdl_identifier_seq *new_seq = _Py_asdl_identifier_seq_new(len, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
expr_ty e = asdl_seq_GET(seq, i);
asdl_seq_SET(new_seq, i, e->v.Name.id);
}
return new_seq;
}
/* Constructs a CmpopExprPair */
CmpopExprPair *
_PyPegen_cmpop_expr_pair(Parser *p, cmpop_ty cmpop, expr_ty expr)
{
assert(expr != NULL);
CmpopExprPair *a = _PyArena_Malloc(p->arena, sizeof(CmpopExprPair));
if (!a) {
return NULL;
}
a->cmpop = cmpop;
a->expr = expr;
return a;
}
asdl_int_seq *
_PyPegen_get_cmpops(Parser *p, asdl_seq *seq)
{
Py_ssize_t len = asdl_seq_LEN(seq);
assert(len > 0);
asdl_int_seq *new_seq = _Py_asdl_int_seq_new(len, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
CmpopExprPair *pair = asdl_seq_GET_UNTYPED(seq, i);
asdl_seq_SET(new_seq, i, pair->cmpop);
}
return new_seq;
}
asdl_expr_seq *
_PyPegen_get_exprs(Parser *p, asdl_seq *seq)
{
Py_ssize_t len = asdl_seq_LEN(seq);
assert(len > 0);
asdl_expr_seq *new_seq = _Py_asdl_expr_seq_new(len, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
CmpopExprPair *pair = asdl_seq_GET_UNTYPED(seq, i);
asdl_seq_SET(new_seq, i, pair->expr);
}
return new_seq;
}
/* Creates an asdl_seq* where all the elements have been changed to have ctx as context */
static asdl_expr_seq *
_set_seq_context(Parser *p, asdl_expr_seq *seq, expr_context_ty ctx)
{
Py_ssize_t len = asdl_seq_LEN(seq);
if (len == 0) {
return NULL;
}
asdl_expr_seq *new_seq = _Py_asdl_expr_seq_new(len, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
expr_ty e = asdl_seq_GET(seq, i);
asdl_seq_SET(new_seq, i, _PyPegen_set_expr_context(p, e, ctx));
}
return new_seq;
}
static expr_ty
_set_name_context(Parser *p, expr_ty e, expr_context_ty ctx)
{
return _PyAST_Name(e->v.Name.id, ctx, EXTRA_EXPR(e, e));
}
static expr_ty
_set_tuple_context(Parser *p, expr_ty e, expr_context_ty ctx)
{
return _PyAST_Tuple(
_set_seq_context(p, e->v.Tuple.elts, ctx),
ctx,
EXTRA_EXPR(e, e));
}
static expr_ty
_set_list_context(Parser *p, expr_ty e, expr_context_ty ctx)
{
return _PyAST_List(
_set_seq_context(p, e->v.List.elts, ctx),
ctx,
EXTRA_EXPR(e, e));
}
static expr_ty
_set_subscript_context(Parser *p, expr_ty e, expr_context_ty ctx)
{
return _PyAST_Subscript(e->v.Subscript.value, e->v.Subscript.slice,
ctx, EXTRA_EXPR(e, e));
}
static expr_ty
_set_attribute_context(Parser *p, expr_ty e, expr_context_ty ctx)
{
return _PyAST_Attribute(e->v.Attribute.value, e->v.Attribute.attr,
ctx, EXTRA_EXPR(e, e));
}
static expr_ty
_set_starred_context(Parser *p, expr_ty e, expr_context_ty ctx)
{
return _PyAST_Starred(_PyPegen_set_expr_context(p, e->v.Starred.value, ctx),
ctx, EXTRA_EXPR(e, e));
}
/* Creates an `expr_ty` equivalent to `expr` but with `ctx` as context */
expr_ty
_PyPegen_set_expr_context(Parser *p, expr_ty expr, expr_context_ty ctx)
{
assert(expr != NULL);
expr_ty new = NULL;
switch (expr->kind) {
case Name_kind:
new = _set_name_context(p, expr, ctx);
break;
case Tuple_kind:
new = _set_tuple_context(p, expr, ctx);
break;
case List_kind:
new = _set_list_context(p, expr, ctx);
break;
case Subscript_kind:
new = _set_subscript_context(p, expr, ctx);
break;
case Attribute_kind:
new = _set_attribute_context(p, expr, ctx);
break;
case Starred_kind:
new = _set_starred_context(p, expr, ctx);
break;
default:
new = expr;
}
return new;
}
/* Constructs a KeyValuePair that is used when parsing a dict's key value pairs */
KeyValuePair *
_PyPegen_key_value_pair(Parser *p, expr_ty key, expr_ty value)
{
KeyValuePair *a = _PyArena_Malloc(p->arena, sizeof(KeyValuePair));
if (!a) {
return NULL;
}
a->key = key;
a->value = value;
return a;
}
/* Extracts all keys from an asdl_seq* of KeyValuePair*'s */
asdl_expr_seq *
_PyPegen_get_keys(Parser *p, asdl_seq *seq)
{
Py_ssize_t len = asdl_seq_LEN(seq);
asdl_expr_seq *new_seq = _Py_asdl_expr_seq_new(len, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
KeyValuePair *pair = asdl_seq_GET_UNTYPED(seq, i);
asdl_seq_SET(new_seq, i, pair->key);
}
return new_seq;
}
/* Extracts all values from an asdl_seq* of KeyValuePair*'s */
asdl_expr_seq *
_PyPegen_get_values(Parser *p, asdl_seq *seq)
{
Py_ssize_t len = asdl_seq_LEN(seq);
asdl_expr_seq *new_seq = _Py_asdl_expr_seq_new(len, p->arena);
if (!new_seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
KeyValuePair *pair = asdl_seq_GET_UNTYPED(seq, i);
asdl_seq_SET(new_seq, i, pair->value);
}
return new_seq;
}
/* Constructs a NameDefaultPair */
NameDefaultPair *
_PyPegen_name_default_pair(Parser *p, arg_ty arg, expr_ty value, Token *tc)
{
NameDefaultPair *a = _PyArena_Malloc(p->arena, sizeof(NameDefaultPair));
if (!a) {
return NULL;
}
a->arg = _PyPegen_add_type_comment_to_arg(p, arg, tc);
a->value = value;
return a;
}
/* Constructs a SlashWithDefault */
SlashWithDefault *
_PyPegen_slash_with_default(Parser *p, asdl_arg_seq *plain_names, asdl_seq *names_with_defaults)
{
SlashWithDefault *a = _PyArena_Malloc(p->arena, sizeof(SlashWithDefault));
if (!a) {
return NULL;
}
a->plain_names = plain_names;
a->names_with_defaults = names_with_defaults;
return a;
}
/* Constructs a StarEtc */
StarEtc *
_PyPegen_star_etc(Parser *p, arg_ty vararg, asdl_seq *kwonlyargs, arg_ty kwarg)
{
StarEtc *a = _PyArena_Malloc(p->arena, sizeof(StarEtc));
if (!a) {
return NULL;
}
a->vararg = vararg;
a->kwonlyargs = kwonlyargs;
a->kwarg = kwarg;
return a;
}
asdl_seq *
_PyPegen_join_sequences(Parser *p, asdl_seq *a, asdl_seq *b)
{
Py_ssize_t first_len = asdl_seq_LEN(a);
Py_ssize_t second_len = asdl_seq_LEN(b);
asdl_seq *new_seq = (asdl_seq*)_Py_asdl_generic_seq_new(first_len + second_len, p->arena);
if (!new_seq) {
return NULL;
}
int k = 0;
for (Py_ssize_t i = 0; i < first_len; i++) {
asdl_seq_SET_UNTYPED(new_seq, k++, asdl_seq_GET_UNTYPED(a, i));
}
for (Py_ssize_t i = 0; i < second_len; i++) {
asdl_seq_SET_UNTYPED(new_seq, k++, asdl_seq_GET_UNTYPED(b, i));
}
return new_seq;
}
static asdl_arg_seq*
_get_names(Parser *p, asdl_seq *names_with_defaults)
{
Py_ssize_t len = asdl_seq_LEN(names_with_defaults);
asdl_arg_seq *seq = _Py_asdl_arg_seq_new(len, p->arena);
if (!seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
NameDefaultPair *pair = asdl_seq_GET_UNTYPED(names_with_defaults, i);
asdl_seq_SET(seq, i, pair->arg);
}
return seq;
}
static asdl_expr_seq *
_get_defaults(Parser *p, asdl_seq *names_with_defaults)
{
Py_ssize_t len = asdl_seq_LEN(names_with_defaults);
asdl_expr_seq *seq = _Py_asdl_expr_seq_new(len, p->arena);
if (!seq) {
return NULL;
}
for (Py_ssize_t i = 0; i < len; i++) {
NameDefaultPair *pair = asdl_seq_GET_UNTYPED(names_with_defaults, i);
asdl_seq_SET(seq, i, pair->value);
}
return seq;
}
static int
_make_posonlyargs(Parser *p,
asdl_arg_seq *slash_without_default,
SlashWithDefault *slash_with_default,
asdl_arg_seq **posonlyargs) {
if (slash_without_default != NULL) {
*posonlyargs = slash_without_default;
}
else if (slash_with_default != NULL) {
asdl_arg_seq *slash_with_default_names =
_get_names(p, slash_with_default->names_with_defaults);
if (!slash_with_default_names) {
return -1;
}
*posonlyargs = (asdl_arg_seq*)_PyPegen_join_sequences(
p,
(asdl_seq*)slash_with_default->plain_names,
(asdl_seq*)slash_with_default_names);
}
else {
*posonlyargs = _Py_asdl_arg_seq_new(0, p->arena);
}
return *posonlyargs == NULL ? -1 : 0;
}
static int
_make_posargs(Parser *p,
asdl_arg_seq *plain_names,
asdl_seq *names_with_default,
asdl_arg_seq **posargs) {
if (plain_names != NULL && names_with_default != NULL) {
asdl_arg_seq *names_with_default_names = _get_names(p, names_with_default);
if (!names_with_default_names) {
return -1;
}
*posargs = (asdl_arg_seq*)_PyPegen_join_sequences(
p,(asdl_seq*)plain_names, (asdl_seq*)names_with_default_names);
}
else if (plain_names == NULL && names_with_default != NULL) {
*posargs = _get_names(p, names_with_default);
}
else if (plain_names != NULL && names_with_default == NULL) {
*posargs = plain_names;
}
else {
*posargs = _Py_asdl_arg_seq_new(0, p->arena);
}
return *posargs == NULL ? -1 : 0;
}
static int
_make_posdefaults(Parser *p,
SlashWithDefault *slash_with_default,
asdl_seq *names_with_default,
asdl_expr_seq **posdefaults) {
if (slash_with_default != NULL && names_with_default != NULL) {
asdl_expr_seq *slash_with_default_values =
_get_defaults(p, slash_with_default->names_with_defaults);
if (!slash_with_default_values) {
return -1;
}
asdl_expr_seq *names_with_default_values = _get_defaults(p, names_with_default);
if (!names_with_default_values) {
return -1;
}
*posdefaults = (asdl_expr_seq*)_PyPegen_join_sequences(
p,
(asdl_seq*)slash_with_default_values,
(asdl_seq*)names_with_default_values);
}
else if (slash_with_default == NULL && names_with_default != NULL) {
*posdefaults = _get_defaults(p, names_with_default);
}
else if (slash_with_default != NULL && names_with_default == NULL) {
*posdefaults = _get_defaults(p, slash_with_default->names_with_defaults);
}
else {
*posdefaults = _Py_asdl_expr_seq_new(0, p->arena);
}
return *posdefaults == NULL ? -1 : 0;
}
static int
_make_kwargs(Parser *p, StarEtc *star_etc,
asdl_arg_seq **kwonlyargs,
asdl_expr_seq **kwdefaults) {
if (star_etc != NULL && star_etc->kwonlyargs != NULL) {
*kwonlyargs = _get_names(p, star_etc->kwonlyargs);
}
else {
*kwonlyargs = _Py_asdl_arg_seq_new(0, p->arena);
}
if (*kwonlyargs == NULL) {
return -1;
}
if (star_etc != NULL && star_etc->kwonlyargs != NULL) {
*kwdefaults = _get_defaults(p, star_etc->kwonlyargs);
}
else {
*kwdefaults = _Py_asdl_expr_seq_new(0, p->arena);
}
if (*kwdefaults == NULL) {
return -1;
}
return 0;
}
/* Constructs an arguments_ty object out of all the parsed constructs in the parameters rule */
arguments_ty
_PyPegen_make_arguments(Parser *p, asdl_arg_seq *slash_without_default,
SlashWithDefault *slash_with_default, asdl_arg_seq *plain_names,
asdl_seq *names_with_default, StarEtc *star_etc)
{
asdl_arg_seq *posonlyargs;
if (_make_posonlyargs(p, slash_without_default, slash_with_default, &posonlyargs) == -1) {
return NULL;
}
asdl_arg_seq *posargs;
if (_make_posargs(p, plain_names, names_with_default, &posargs) == -1) {
return NULL;
}
asdl_expr_seq *posdefaults;
if (_make_posdefaults(p,slash_with_default, names_with_default, &posdefaults) == -1) {
return NULL;
}
arg_ty vararg = NULL;
if (star_etc != NULL && star_etc->vararg != NULL) {
vararg = star_etc->vararg;
}
asdl_arg_seq *kwonlyargs;
asdl_expr_seq *kwdefaults;
if (_make_kwargs(p, star_etc, &kwonlyargs, &kwdefaults) == -1) {
return NULL;
}
arg_ty kwarg = NULL;
if (star_etc != NULL && star_etc->kwarg != NULL) {
kwarg = star_etc->kwarg;
}
return _PyAST_arguments(posonlyargs, posargs, vararg, kwonlyargs,
kwdefaults, kwarg, posdefaults, p->arena);
}
/* Constructs an empty arguments_ty object, that gets used when a function accepts no
* arguments. */
arguments_ty
_PyPegen_empty_arguments(Parser *p)
{
asdl_arg_seq *posonlyargs = _Py_asdl_arg_seq_new(0, p->arena);
if (!posonlyargs) {
return NULL;
}
asdl_arg_seq *posargs = _Py_asdl_arg_seq_new(0, p->arena);
if (!posargs) {
return NULL;
}
asdl_expr_seq *posdefaults = _Py_asdl_expr_seq_new(0, p->arena);
if (!posdefaults) {
return NULL;
}
asdl_arg_seq *kwonlyargs = _Py_asdl_arg_seq_new(0, p->arena);
if (!kwonlyargs) {
return NULL;
}
asdl_expr_seq *kwdefaults = _Py_asdl_expr_seq_new(0, p->arena);
if (!kwdefaults) {
return NULL;
}
return _PyAST_arguments(posonlyargs, posargs, NULL, kwonlyargs,
kwdefaults, NULL, posdefaults, p->arena);
}
/* Encapsulates the value of an operator_ty into an AugOperator struct */
AugOperator *
_PyPegen_augoperator(Parser *p, operator_ty kind)
{
AugOperator *a = _PyArena_Malloc(p->arena, sizeof(AugOperator));
if (!a) {
return NULL;
}
a->kind = kind;
return a;
}
/* Construct a FunctionDef equivalent to function_def, but with decorators */
stmt_ty
_PyPegen_function_def_decorators(Parser *p, asdl_expr_seq *decorators, stmt_ty function_def)
{
assert(function_def != NULL);
if (function_def->kind == AsyncFunctionDef_kind) {
return _PyAST_AsyncFunctionDef(
function_def->v.FunctionDef.name, function_def->v.FunctionDef.args,
function_def->v.FunctionDef.body, decorators, function_def->v.FunctionDef.returns,
function_def->v.FunctionDef.type_comment, function_def->lineno,
function_def->col_offset, function_def->end_lineno, function_def->end_col_offset,
p->arena);
}
return _PyAST_FunctionDef(
function_def->v.FunctionDef.name, function_def->v.FunctionDef.args,
function_def->v.FunctionDef.body, decorators,
function_def->v.FunctionDef.returns,
function_def->v.FunctionDef.type_comment, function_def->lineno,
function_def->col_offset, function_def->end_lineno,
function_def->end_col_offset, p->arena);
}
/* Construct a ClassDef equivalent to class_def, but with decorators */
stmt_ty
_PyPegen_class_def_decorators(Parser *p, asdl_expr_seq *decorators, stmt_ty class_def)
{
assert(class_def != NULL);
return _PyAST_ClassDef(
class_def->v.ClassDef.name, class_def->v.ClassDef.bases,
class_def->v.ClassDef.keywords, class_def->v.ClassDef.body, decorators,
class_def->lineno, class_def->col_offset, class_def->end_lineno,
class_def->end_col_offset, p->arena);
}
/* Construct a KeywordOrStarred */
KeywordOrStarred *
_PyPegen_keyword_or_starred(Parser *p, void *element, int is_keyword)
{
KeywordOrStarred *a = _PyArena_Malloc(p->arena, sizeof(KeywordOrStarred));
if (!a) {
return NULL;
}
a->element = element;
a->is_keyword = is_keyword;
return a;
}
/* Get the number of starred expressions in an asdl_seq* of KeywordOrStarred*s */
static int
_seq_number_of_starred_exprs(asdl_seq *seq)
{
int n = 0;
for (Py_ssize_t i = 0, l = asdl_seq_LEN(seq); i < l; i++) {
KeywordOrStarred *k = asdl_seq_GET_UNTYPED(seq, i);
if (!k->is_keyword) {
n++;
}
}
return n;
}
/* Extract the starred expressions of an asdl_seq* of KeywordOrStarred*s */
asdl_expr_seq *
_PyPegen_seq_extract_starred_exprs(Parser *p, asdl_seq *kwargs)
{
int new_len = _seq_number_of_starred_exprs(kwargs);
if (new_len == 0) {
return NULL;
}
asdl_expr_seq *new_seq = _Py_asdl_expr_seq_new(new_len, p->arena);
if (!new_seq) {
return NULL;
}
int idx = 0;
for (Py_ssize_t i = 0, len = asdl_seq_LEN(kwargs); i < len; i++) {
KeywordOrStarred *k = asdl_seq_GET_UNTYPED(kwargs, i);
if (!k->is_keyword) {
asdl_seq_SET(new_seq, idx++, k->element);
}
}
return new_seq;
}
/* Return a new asdl_seq* with only the keywords in kwargs */
asdl_keyword_seq*
_PyPegen_seq_delete_starred_exprs(Parser *p, asdl_seq *kwargs)
{
Py_ssize_t len = asdl_seq_LEN(kwargs);
Py_ssize_t new_len = len - _seq_number_of_starred_exprs(kwargs);
if (new_len == 0) {
return NULL;
}
asdl_keyword_seq *new_seq = _Py_asdl_keyword_seq_new(new_len, p->arena);
if (!new_seq) {
return NULL;
}
int idx = 0;
for (Py_ssize_t i = 0; i < len; i++) {
KeywordOrStarred *k = asdl_seq_GET_UNTYPED(kwargs, i);
if (k->is_keyword) {
asdl_seq_SET(new_seq, idx++, k->element);
}
}
return new_seq;
}
expr_ty
_PyPegen_concatenate_strings(Parser *p, asdl_seq *strings)
{
Py_ssize_t len = asdl_seq_LEN(strings);
assert(len > 0);
Token *first = asdl_seq_GET_UNTYPED(strings, 0);
Token *last = asdl_seq_GET_UNTYPED(strings, len - 1);
int bytesmode = 0;
PyObject *bytes_str = NULL;
FstringParser state;
_PyPegen_FstringParser_Init(&state);
for (Py_ssize_t i = 0; i < len; i++) {
Token *t = asdl_seq_GET_UNTYPED(strings, i);
int this_bytesmode;
int this_rawmode;
PyObject *s;
const char *fstr;
Py_ssize_t fstrlen = -1;
if (_PyPegen_parsestr(p, &this_bytesmode, &this_rawmode, &s, &fstr, &fstrlen, t) != 0) {
goto error;
}
/* Check that we are not mixing bytes with unicode. */
if (i != 0 && bytesmode != this_bytesmode) {
RAISE_SYNTAX_ERROR("cannot mix bytes and nonbytes literals");
Py_XDECREF(s);
goto error;
}
bytesmode = this_bytesmode;
if (fstr != NULL) {
assert(s == NULL && !bytesmode);
int result = _PyPegen_FstringParser_ConcatFstring(p, &state, &fstr, fstr + fstrlen,
this_rawmode, 0, first, t, last);
if (result < 0) {
goto error;
}
}
else {
/* String or byte string. */
assert(s != NULL && fstr == NULL);
assert(bytesmode ? PyBytes_CheckExact(s) : PyUnicode_CheckExact(s));
if (bytesmode) {
if (i == 0) {
bytes_str = s;
}
else {
PyBytes_ConcatAndDel(&bytes_str, s);
if (!bytes_str) {
goto error;
}
}
}
else {
/* This is a regular string. Concatenate it. */
if (_PyPegen_FstringParser_ConcatAndDel(&state, s) < 0) {
goto error;
}
}
}
}
if (bytesmode) {
if (_PyArena_AddPyObject(p->arena, bytes_str) < 0) {
goto error;
}
return _PyAST_Constant(bytes_str, NULL, first->lineno,
first->col_offset, last->end_lineno,
last->end_col_offset, p->arena);
}
return _PyPegen_FstringParser_Finish(p, &state, first, last);
error:
Py_XDECREF(bytes_str);
_PyPegen_FstringParser_Dealloc(&state);
if (PyErr_Occurred()) {
raise_decode_error(p);
}
return NULL;
}
mod_ty
_PyPegen_make_module(Parser *p, asdl_stmt_seq *a) {
asdl_type_ignore_seq *type_ignores = NULL;
Py_ssize_t num = p->type_ignore_comments.num_items;
if (num > 0) {
// Turn the raw (comment, lineno) pairs into TypeIgnore objects in the arena
type_ignores = _Py_asdl_type_ignore_seq_new(num, p->arena);
if (type_ignores == NULL) {
return NULL;
}
for (int i = 0; i < num; i++) {
PyObject *tag = _PyPegen_new_type_comment(p, p->type_ignore_comments.items[i].comment);
if (tag == NULL) {
return NULL;
}
type_ignore_ty ti = _PyAST_TypeIgnore(p->type_ignore_comments.items[i].lineno,
tag, p->arena);
if (ti == NULL) {
return NULL;
}
asdl_seq_SET(type_ignores, i, ti);
}
}
return _PyAST_Module(a, type_ignores, p->arena);
}
// Error reporting helpers
expr_ty
_PyPegen_get_invalid_target(expr_ty e, TARGETS_TYPE targets_type)
{
if (e == NULL) {
return NULL;
}
#define VISIT_CONTAINER(CONTAINER, TYPE) do { \
Py_ssize_t len = asdl_seq_LEN((CONTAINER)->v.TYPE.elts);\
for (Py_ssize_t i = 0; i < len; i++) {\
expr_ty other = asdl_seq_GET((CONTAINER)->v.TYPE.elts, i);\
expr_ty child = _PyPegen_get_invalid_target(other, targets_type);\
if (child != NULL) {\
return child;\
}\
}\
} while (0)
// We only need to visit List and Tuple nodes recursively as those
// are the only ones that can contain valid names in targets when
// they are parsed as expressions. Any other kind of expression
// that is a container (like Sets or Dicts) is directly invalid and
// we don't need to visit it recursively.
switch (e->kind) {
case List_kind:
VISIT_CONTAINER(e, List);
return NULL;
case Tuple_kind:
VISIT_CONTAINER(e, Tuple);
return NULL;
case Starred_kind:
if (targets_type == DEL_TARGETS) {
return e;
}
return _PyPegen_get_invalid_target(e->v.Starred.value, targets_type);
case Compare_kind:
// This is needed, because the `a in b` in `for a in b` gets parsed
// as a comparison, and so we need to search the left side of the comparison
// for invalid targets.
if (targets_type == FOR_TARGETS) {
cmpop_ty cmpop = (cmpop_ty) asdl_seq_GET(e->v.Compare.ops, 0);
if (cmpop == In) {
return _PyPegen_get_invalid_target(e->v.Compare.left, targets_type);
}
return NULL;
}
return e;
case Name_kind:
case Subscript_kind:
case Attribute_kind:
return NULL;
default:
return e;
}
}
void *_PyPegen_arguments_parsing_error(Parser *p, expr_ty e) {
int kwarg_unpacking = 0;
for (Py_ssize_t i = 0, l = asdl_seq_LEN(e->v.Call.keywords); i < l; i++) {
keyword_ty keyword = asdl_seq_GET(e->v.Call.keywords, i);
if (!keyword->arg) {
kwarg_unpacking = 1;
}
}
const char *msg = NULL;
if (kwarg_unpacking) {
msg = "positional argument follows keyword argument unpacking";
} else {
msg = "positional argument follows keyword argument";
}
return RAISE_SYNTAX_ERROR(msg);
}
void *
_PyPegen_nonparen_genexp_in_call(Parser *p, expr_ty args)
{
/* The rule that calls this function is 'args for_if_clauses'.
For the input f(L, x for x in y), L and x are in args and
the for is parsed as a for_if_clause. We have to check if
len <= 1, so that input like dict((a, b) for a, b in x)
gets successfully parsed and then we pass the last
argument (x in the above example) as the location of the
error */
Py_ssize_t len = asdl_seq_LEN(args->v.Call.args);
if (len <= 1) {
return NULL;
}
return RAISE_SYNTAX_ERROR_STARTING_FROM(
(expr_ty) asdl_seq_GET(args->v.Call.args, len - 1),
"Generator expression must be parenthesized"
);
}
expr_ty _PyPegen_collect_call_seqs(Parser *p, asdl_expr_seq *a, asdl_seq *b,
int lineno, int col_offset, int end_lineno,
int end_col_offset, PyArena *arena) {
Py_ssize_t args_len = asdl_seq_LEN(a);
Py_ssize_t total_len = args_len;
if (b == NULL) {
return _PyAST_Call(_PyPegen_dummy_name(p), a, NULL, lineno, col_offset,
end_lineno, end_col_offset, arena);
}
asdl_expr_seq *starreds = _PyPegen_seq_extract_starred_exprs(p, b);
asdl_keyword_seq *keywords = _PyPegen_seq_delete_starred_exprs(p, b);
if (starreds) {
total_len += asdl_seq_LEN(starreds);
}
asdl_expr_seq *args = _Py_asdl_expr_seq_new(total_len, arena);
Py_ssize_t i = 0;
for (i = 0; i < args_len; i++) {
asdl_seq_SET(args, i, asdl_seq_GET(a, i));
}
for (; i < total_len; i++) {
asdl_seq_SET(args, i, asdl_seq_GET(starreds, i - args_len));
}
return _PyAST_Call(_PyPegen_dummy_name(p), args, keywords, lineno,
col_offset, end_lineno, end_col_offset, arena);
}
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