#include <Python.h>

#include <errcode.h>

#include "pycore_pyerrors.h" // _PyErr_ProgramDecodedTextObject()

#include "pycore_runtime.h" // _Py_ID()

#include "pycore_tuple.h" // _PyTuple_FromPair

#include "lexer/state.h"

#include "lexer/lexer.h"

#include "pegen.h"

_PyPegen_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);

if (PyErr_GivenExceptionMatches(value, PyExc_SyntaxError)) {

if (PyObject_SetAttr(value, &_Py_ID(filename), filename)) {

goto error;

}

PyErr_Restore(type, value, tback);

return;

}

errstr = PyObject_Str(value);

if (!errstr) {

goto error;

}

PyObject *tmp = Py_BuildValue("(OiiO)", filename, 0, -1, Py_None);

if (!tmp) {

goto error;

}

tuple = _PyTuple_FromPair(errstr, tmp);

Py_DECREF(tmp);

if (!tuple) {

goto error;

}

PyErr_SetObject(PyExc_SyntaxError, tuple);

error:

Py_XDECREF(type);

Py_XDECREF(value);

Py_XDECREF(tback);

Py_XDECREF(errstr);

Py_XDECREF(tuple);

}

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]);

}

_Pypegen_tokenizer_error(Parser *p)

{

if (PyErr_Occurred()) {

return -1;

}

const char *msg = NULL;

PyObject* errtype = PyExc_SyntaxError;

Py_ssize_t col_offset = -1;

p->error_indicator = 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 = p->tok->cur - p->tok->buf - 1;

msg = "unexpected character after line continuation character";

break;

}

case E_COLUMNOVERFLOW:

PyErr_SetString(PyExc_OverflowError,

"Parser column offset overflow - source line is too big");

return -1;

default:

msg = "unknown parsing error";

}

RAISE_ERROR_KNOWN_LOCATION(p, errtype, p->tok->lineno,

col_offset >= 0 ? col_offset : 0,

p->tok->lineno, -1, msg);

return -1;

}

_Pypegen_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 int

_PyPegen_tokenize_full_source_to_check_for_errors(Parser *p) {

// Tokenize the whole input to see if there are any tokenization

// errors such as mismatching 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;

}

PyObject *type, *value, *traceback;

PyErr_Fetch(&type, &value, &traceback);

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;

int ret = 0;

struct token new_token;

_PyToken_Init(&new_token);

for (;;) {

switch (_PyTokenizer_Get(p->tok, &new_token)) {

case ERRORTOKEN:

if (PyErr_Occurred()) {

ret = -1;

goto exit;

}

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);

ret = -1;

goto exit;

}

}

break;

case ENDMARKER:

break;

default:

continue;

}

break;

}

exit:

_PyToken_Free(&new_token);

// If we're in an f-string, we want the syntax error in the expression part

// to propagate, so that tokenizer errors (like expecting '}') that happen afterwards

// do not swallow it.

if (PyErr_Occurred() && p->tok->tok_mode_stack_index <= 0) {

Py_XDECREF(value);

Py_XDECREF(type);

Py_XDECREF(traceback);

} else {

PyErr_Restore(type, value, traceback);

}

return ret;

}

void *

_PyPegen_raise_error(Parser *p, PyObject *errtype, int use_mark, const char *errmsg, ...)

{

// Bail out if we already have an error set.

if (p->error_indicator && PyErr_Occurred()) {

return NULL;

}

if (p->fill == 0) {

va_list va;

va_start(va, errmsg);

_PyPegen_raise_error_known_location(p, errtype, 0, 0, 0, -1, errmsg, va);

va_end(va);

return NULL;

}

if (use_mark && p->mark == p->fill && _PyPegen_fill_token(p) < 0) {

p->error_indicator = 1;

return NULL;

}

Token *t = p->known_err_token != NULL

? p->known_err_token

: p->tokens[use_mark ? p->mark : p->fill - 1];

Py_ssize_t col_offset;

Py_ssize_t end_col_offset = -1;

if (t->col_offset == -1) {

if (p->tok->cur == p->tok->buf) {

col_offset = 0;

} else {

const char* start = p->tok->buf ? p->tok->line_start : p->tok->buf;

col_offset = Py_SAFE_DOWNCAST(p->tok->cur - start, 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_from_tokenizer_buffers(Parser *p, Py_ssize_t lineno)

{

/* If the file descriptor is interactive, the source lines of the current

assert((p->tok->fp == NULL && p->tok->str != NULL) || p->tok->fp != NULL);

char *cur_line = p->tok->fp_interactive ? p->tok->interactive_src_start : p->tok->str;

if (cur_line == NULL) {

assert(p->tok->fp_interactive);

// We can reach this point if the tokenizer buffers for interactive source have not been

// initialized because we failed to decode the original source with the given locale.

return Py_GetConstant(Py_CONSTANT_EMPTY_STR);

}

Py_ssize_t relative_lineno = p->starting_lineno ? lineno - p->starting_lineno + 1 : lineno;

const char* buf_end = p->tok->fp_interactive ? p->tok->interactive_src_end : p->tok->inp;

if (buf_end < cur_line) {

buf_end = cur_line + strlen(cur_line);

}

for (int i = 0; i < relative_lineno - 1; i++) {

char *new_line = strchr(cur_line, '\n');

// The assert is here for debug builds but the conditional that

// follows is there so in release builds we do not crash at the cost

// to report a potentially wrong line.

assert(new_line != NULL && new_line + 1 < buf_end);

if (new_line == NULL || new_line + 1 > buf_end) {

break;

}

cur_line = new_line + 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)

{

// Bail out if we already have an error set.

if (p->error_indicator && PyErr_Occurred()) {

return NULL;

}

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;

}

errstr = PyUnicode_FromFormatV(errmsg, va);

if (!errstr) {

goto error;

}

if (p->tok->fp_interactive && p->tok->interactive_src_start != NULL) {

error_line = get_error_line_from_tokenizer_buffers(p, lineno);

}

else if (p->start_rule == Py_file_input) {

error_line = _PyErr_ProgramDecodedTextObject(p->tok->filename,

(int) lineno, p->tok->encoding);

}

if (!error_line) {

/* PyErr_ProgramTextObject was not called or returned NULL. If it was not called,

assert(p->tok->fp == NULL || p->tok->fp == stdin || p->tok->done == E_EOF);

if (p->tok->lineno <= lineno && p->tok->inp > p->tok->buf) {

Py_ssize_t size = p->tok->inp - p->tok->line_start;

error_line = PyUnicode_DecodeUTF8(p->tok->line_start, size, "replace");

}

else if (p->tok->fp == NULL || p->tok->fp == stdin) {

error_line = get_error_line_from_tokenizer_buffers(p, lineno);

}

else {

error_line = Py_GetConstant(Py_CONSTANT_EMPTY_STR);

}

if (!error_line) {

goto error;

}

}

Py_ssize_t col_number = col_offset;

Py_ssize_t end_col_number = end_col_offset;

col_number = _PyPegen_byte_offset_to_character_offset(error_line, col_offset);

if (col_number < 0) {

goto error;

}

if (end_col_offset > 0) {

end_col_number = _PyPegen_byte_offset_to_character_offset(error_line, end_col_offset);

if (end_col_number < 0) {

goto error;

}

}

tmp = Py_BuildValue("(OnnNnn)", p->tok->filename, lineno, col_number, error_line, end_lineno, end_col_number);

if (!tmp) {

goto error;

}

value = _PyTuple_FromPair(errstr, tmp);

Py_DECREF(tmp);

if (!value) {

goto error;

}

PyErr_SetObject(errtype, value);

Py_DECREF(errstr);

Py_DECREF(value);

return NULL;

error:

Py_XDECREF(errstr);

Py_XDECREF(error_line);

return NULL;

}

_Pypegen_set_syntax_error(Parser* p, Token* last_token) {

// Existing syntax error

if (PyErr_Occurred()) {

// Prioritize tokenizer errors to custom syntax errors raised

// on the second phase only if the errors come from the parser.

int is_tok_ok = (p->tok->done == E_DONE || p->tok->done == E_OK);

if (is_tok_ok && PyErr_ExceptionMatches(PyExc_SyntaxError)) {

_PyPegen_tokenize_full_source_to_check_for_errors(p);

}

// Propagate the existing syntax error.

return;

}

// Initialization error

if (p->fill == 0) {

RAISE_SYNTAX_ERROR("error at start before reading any input");

}

// Parser encountered EOF (End of File) unexpectedtly

if (last_token->type == ERRORTOKEN && p->tok->done == E_EOF) {

if (p->tok->level) {

raise_unclosed_parentheses_error(p);

} else {

RAISE_SYNTAX_ERROR("unexpected EOF while parsing");

}

return;

}

// Indentation error in the tokenizer

if (last_token->type == INDENT || last_token->type == DEDENT) {

RAISE_INDENTATION_ERROR(last_token->type == INDENT ? "unexpected indent" : "unexpected unindent");

return;

}

// Unknown error (generic case)

// Use the last token we found on the first pass to avoid reporting

// incorrect locations for generic syntax errors just because we reached

// further away when trying to find specific syntax errors in the second

// pass.

RAISE_SYNTAX_ERROR_KNOWN_LOCATION(last_token, "invalid syntax");

// _PyPegen_tokenize_full_source_to_check_for_errors will override the existing

// generic SyntaxError we just raised if errors are found.

_PyPegen_tokenize_full_source_to_check_for_errors(p);

}

_Pypegen_stack_overflow(Parser *p)

{

p->error_indicator = 1;

PyErr_SetString(PyExc_MemoryError,

"Parser stack overflowed - Python source too complex to parse");

}