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bpo-40334: Improve column offsets for thrown syntax errors by Pegen (GH-19782)

This commit is contained in:
Batuhan Taskaya 2020-05-01 16:13:43 +03:00 committed by GitHub
parent 719e14d283
commit 76c1b4d5c5
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 80 additions and 112 deletions
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2
Grammar/python.gram
View File

@ -609,7 +609,7 @@ invalid_assignment:
| expression ':' expression ['=' annotated_rhs] {
RAISE_SYNTAX_ERROR("illegal target for annotation") }
| a=expression ('=' | augassign) (yield_expr | star_expressions) {
RAISE_SYNTAX_ERROR("cannot assign to %s", _PyPegen_get_expr_name(a)) }
RAISE_SYNTAX_ERROR_NO_COL_OFFSET("cannot assign to %s", _PyPegen_get_expr_name(a)) }
invalid_block:
| NEWLINE !INDENT { RAISE_INDENTATION_ERROR("expected an indented block") }
invalid_comprehension:

24
Lib/test/test_exceptions.py
View File

@ -178,9 +178,7 @@ class ExceptionTests(unittest.TestCase):
s = '''if True:\n print()\n\texec "mixed tabs and spaces"'''
ckmsg(s, "inconsistent use of tabs and spaces in indentation", TabError)
@support.skip_if_new_parser("Pegen column offsets might be different")
def testSyntaxErrorOffset(self):
def check(src, lineno, offset, encoding='utf-8'):
def check(self, src, lineno, offset, encoding='utf-8'):
with self.assertRaises(SyntaxError) as cm:
compile(src, '<fragment>', 'exec')
self.assertEqual(cm.exception.lineno, lineno)
@ -191,6 +189,8 @@ class ExceptionTests(unittest.TestCase):
line = src.split('\n')[lineno-1]
self.assertIn(line, cm.exception.text)
def testSyntaxErrorOffset(self):
check = self.check
check('def fact(x):\n\treturn x!\n', 2, 10)
check('1 +\n', 1, 4)
check('def spam():\n print(1)\n print(2)', 3, 10)
@ -238,20 +238,20 @@ class ExceptionTests(unittest.TestCase):
check('nonlocal x', 1, 1)
check('def f():\n global x\n nonlocal x', 2, 3)
# Errors thrown by ast.c
check('for 1 in []: pass', 1, 5)
check('def f(*):\n pass', 1, 7)
check('[*x for x in xs]', 1, 2)
check('def f():\n x, y: int', 2, 3)
check('(yield i) = 2', 1, 1)
check('foo(x for x in range(10), 100)', 1, 5)
check('foo(1=2)', 1, 5)
# Errors thrown by future.c
check('from __future__ import doesnt_exist', 1, 1)
check('from __future__ import braces', 1, 1)
check('x=1\nfrom __future__ import division', 2, 1)
@support.skip_if_new_parser("Pegen column offsets might be different")
def testSyntaxErrorOffsetCustom(self):
self.check('for 1 in []: pass', 1, 5)
self.check('def f(*):\n pass', 1, 7)
self.check('[*x for x in xs]', 1, 2)
self.check('def f():\n x, y: int', 2, 3)
self.check('(yield i) = 2', 1, 1)
self.check('foo(x for x in range(10), 100)', 1, 5)
self.check('foo(1=2)', 1, 5)
@cpython_only
def testSettingException(self):

2
Parser/pegen/parse.c
View File

@ -10515,7 +10515,7 @@ invalid_assignment_rule(Parser *p)
(_tmp_132_var = _tmp_132_rule(p))
)
{
res = RAISE_SYNTAX_ERROR ( "cannot assign to %s" , _PyPegen_get_expr_name ( a ) );
res = RAISE_SYNTAX_ERROR_NO_COL_OFFSET ( "cannot assign to %s" , _PyPegen_get_expr_name ( a ) );
if (res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
return NULL;

129
Parser/pegen/pegen.c
View File

@ -145,11 +145,15 @@ byte_offset_to_character_offset(PyObject *line, int col_offset)
if (!str) {
return 0;
}
PyObject *text = PyUnicode_DecodeUTF8(str, col_offset, NULL);
PyObject *text = PyUnicode_DecodeUTF8(str, col_offset, "replace");
if (!text) {
return 0;
}
Py_ssize_t size = PyUnicode_GET_LENGTH(text);
str = PyUnicode_AsUTF8(text);
if (str != NULL && (int)strlen(str) == col_offset) {
size = strlen(str);
}
Py_DECREF(text);
return size;
}
@ -297,68 +301,23 @@ error:
}
static inline PyObject *
get_error_line(char *buffer)
get_error_line(char *buffer, int is_file)
{
char *newline = strchr(buffer, '\n');
const char *newline;
if (is_file) {
newline = strrchr(buffer, '\n');
} else {
newline = strchr(buffer, '\n');
}
if (newline) {
return PyUnicode_FromStringAndSize(buffer, newline - buffer);
return PyUnicode_DecodeUTF8(buffer, newline - buffer, "replace");
}
else {
return PyUnicode_FromString(buffer);
return PyUnicode_DecodeUTF8(buffer, strlen(buffer), "replace");
}
}
static int
tokenizer_error_with_col_offset(Parser *p, PyObject *errtype, const char *errmsg)
{
PyObject *errstr = NULL;
PyObject *value = NULL;
size_t col_number = -1;
errstr = PyUnicode_FromString(errmsg);
if (!errstr) {
return -1;
}
PyObject *loc = NULL;
if (p->start_rule == Py_file_input) {
loc = PyErr_ProgramTextObject(p->tok->filename, p->tok->lineno);
}
if (!loc) {
loc = get_error_line(p->tok->buf);
}
if (loc) {
col_number = p->tok->cur - p->tok->buf;
}
else {
Py_INCREF(Py_None);
loc = Py_None;
}
PyObject *tmp = Py_BuildValue("(OiiN)", p->tok->filename, p->tok->lineno,
col_number, loc);
if (!tmp) {
goto error;
}
value = PyTuple_Pack(2, errstr, tmp);
Py_DECREF(tmp);
if (!value) {
goto error;
}
PyErr_SetObject(errtype, value);
Py_XDECREF(value);
Py_XDECREF(errstr);
return -1;
error:
Py_XDECREF(errstr);
Py_XDECREF(loc);
return -1;
}
static int
tokenizer_error(Parser *p)
{
@ -376,20 +335,20 @@ tokenizer_error(Parser *p)
msg = "invalid character in identifier";
break;
case E_BADPREFIX:
return tokenizer_error_with_col_offset(p,
errtype, "invalid string prefix");
RAISE_SYNTAX_ERROR("invalid string prefix");
return -1;
case E_EOFS:
return tokenizer_error_with_col_offset(p,
errtype, "EOF while scanning triple-quoted string literal");
RAISE_SYNTAX_ERROR("EOF while scanning triple-quoted string literal");
return -1;
case E_EOLS:
return tokenizer_error_with_col_offset(p,
errtype, "EOL while scanning string literal");
RAISE_SYNTAX_ERROR("EOL while scanning string literal");
return -1;
case E_EOF:
return tokenizer_error_with_col_offset(p,
errtype, "unexpected EOF while parsing");
RAISE_SYNTAX_ERROR("unexpected EOF while parsing");
return -1;
case E_DEDENT:
return tokenizer_error_with_col_offset(p,
PyExc_IndentationError, "unindent does not match any outer indentation level");
RAISE_INDENTATION_ERROR("unindent does not match any outer indentation level");
return -1;
case E_INTR:
if (!PyErr_Occurred()) {
PyErr_SetNone(PyExc_KeyboardInterrupt);
@ -421,14 +380,14 @@ tokenizer_error(Parser *p)
}
void *
_PyPegen_raise_error(Parser *p, PyObject *errtype, const char *errmsg, ...)
_PyPegen_raise_error(Parser *p, PyObject *errtype, int with_col_number, const char *errmsg, ...)
{
PyObject *value = NULL;
PyObject *errstr = NULL;
PyObject *loc = NULL;
PyObject *tmp = NULL;
Token *t = p->tokens[p->fill - 1];
Py_ssize_t col_number = 0;
Py_ssize_t col_number = !with_col_number;
va_list va;
va_start(va, errmsg);
@ -443,14 +402,20 @@ _PyPegen_raise_error(Parser *p, PyObject *errtype, const char *errmsg, ...)
}
if (!loc) {
loc = get_error_line(p->tok->buf);
loc = get_error_line(p->tok->buf, p->start_rule == Py_file_input);
}
if (loc) {
int col_offset = t->col_offset == -1 ? 0 : t->col_offset;
col_number = byte_offset_to_character_offset(loc, col_offset) + 1;
if (loc && with_col_number) {
int 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;
}
else {
col_number = byte_offset_to_character_offset(loc, col_offset);
}
else if (!loc) {
Py_INCREF(Py_None);
loc = Py_None;
}
@ -632,14 +597,6 @@ _PyPegen_fill_token(Parser *p)
type = PyTokenizer_Get(p->tok, &start, &end);
}
if (type == ERRORTOKEN) {
if (p->tok->done == E_DECODE) {
return raise_decode_error(p);
}
else {
return tokenizer_error(p);
}
}
if (type == ENDMARKER && p->start_rule == Py_single_input && p->parsing_started) {
type = NEWLINE; /* Add an extra newline */
p->parsing_started = 0;
@ -700,6 +657,16 @@ _PyPegen_fill_token(Parser *p)
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);
}
else {
return tokenizer_error(p);
}
}
return 0;
}

9
Parser/pegen/pegen.h
View File

@ -126,14 +126,15 @@ expr_ty _PyPegen_name_token(Parser *p);
expr_ty _PyPegen_number_token(Parser *p);
void *_PyPegen_string_token(Parser *p);
const char *_PyPegen_get_expr_name(expr_ty);
void *_PyPegen_raise_error(Parser *p, PyObject *, const char *errmsg, ...);
void *_PyPegen_raise_error(Parser *p, PyObject *errtype, int with_col_number, const char *errmsg, ...);
void *_PyPegen_dummy_name(Parser *p, ...);
#define UNUSED(expr) do { (void)(expr); } while (0)
#define EXTRA_EXPR(head, tail) head->lineno, head->col_offset, tail->end_lineno, tail->end_col_offset, p->arena
#define EXTRA start_lineno, start_col_offset, end_lineno, end_col_offset, p->arena
#define RAISE_SYNTAX_ERROR(msg, ...) _PyPegen_raise_error(p, PyExc_SyntaxError, msg, ##__VA_ARGS__)
#define RAISE_INDENTATION_ERROR(msg, ...) _PyPegen_raise_error(p, PyExc_IndentationError, msg, ##__VA_ARGS__)
#define RAISE_SYNTAX_ERROR(msg, ...) _PyPegen_raise_error(p, PyExc_SyntaxError, 1, msg, ##__VA_ARGS__)
#define RAISE_INDENTATION_ERROR(msg, ...) _PyPegen_raise_error(p, PyExc_IndentationError, 1, msg, ##__VA_ARGS__)
#define RAISE_SYNTAX_ERROR_NO_COL_OFFSET(msg, ...) _PyPegen_raise_error(p, PyExc_SyntaxError, 0, msg, ##__VA_ARGS__)
Py_LOCAL_INLINE(void *)
CHECK_CALL(Parser *p, void *result)
@ -190,7 +191,7 @@ INVALID_VERSION_CHECK(Parser *p, int version, char *msg, void *node)
}
if (p->feature_version < version) {
p->error_indicator = 1;
return _PyPegen_raise_error(p, PyExc_SyntaxError, "%s only supported in Python 3.%i and greater",
return RAISE_SYNTAX_ERROR("%s only supported in Python 3.%i and greater",
msg, version);
}
return node;