Incorrect SyntaxError attributes when raised by `compile`

Bug report

Bug description:

This is probably a problem with compile, and I will demonstrate it through ast.parse. Consider the following code in a file f.py.

import ast

code = "x y"
ast.parse(code, filename='f.py')

This correctly raises a SyntaxError with lineno = 1 and offset = 3 since the error is at the beginning of y in the code. However, the traceback points into the file f.py itself, instead of the string code. Notice that it points to the third column of the first line of f.py.

  File "f.py", line 1
    import ast
      ^
SyntaxError: invalid syntax

This does not happen for any other string given as filename to ast.parse. In general, the traceback seems to point with the "correct" lineno and offset to the code in the file itself instead of code given to ast.parse. However, the problem is slightly more nuanced. If the offset in the string given to ast.parse is more than the length of the corresponding line in f.py, the offset attribute of the SyntaxError raised is incorrectly set to the length of the corresponding line in f.py plus two. Consider the following code in f.py.

import ast

code = "                                     x y"
ast.parse(code, filename='f.py')

This raises the following exception.

  File "f.py", line 1
    import ast
              ^
IndentationError: unexpected indent

On closer inspection, it turns out that the offset of the exception raised is 12 (note that the length of "import ast" is 10) instead of the correct 37 which is observed when filename is set to anything other than f.py. However, something more interesting happens when the number of lines in the code string is more than the number of lines in the file f.py.

import ast

code = "\n\n\n\nx y"
ast.parse(code, filename='f.py')

The problem goes away!

  File "f.py", line 5
    x y
      ^
SyntaxError: invalid syntax

We even see the correct offset.

CPython versions tested on:

3.11, 3.12, 3.13

Operating systems tested on:

Linux

(Edit) Incorrect text attribute

There is something more going on here. The following issue can be seen in 3.11 and 3.12 but not in 3.13. Consider the following f.py.

import ast

with open('temp.py') as f:
    code = f.read()
ast.parse(code, filename='temp.py')

temp.py is as follows.

"""                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             """; x """                                                                                                                                                         """; foobar

This leads to the following traceback.

  File "temp.py", line 1
    foobar
          ^
SyntaxError: invalid syntax

Besides the fact that the offset is incorrectly set to 8 (instead of 840), the text is incorrectly set to foobar (on 3.13, the entire file contents of temp.py are present in text). This problem goes away if filename is set to anything else. The problem also goes away if the contents of temp.py are shorter!

首先使用 ast.parse 和 compile 重現這些範例，比較 filename 與來源檔案相符和不相符時的 SyntaxError 屬性。追蹤檔名相符時 traceback、offset 和 text 的填入方式。當在所示案例中，lineno、offset、text 和 traceback 始終一致地描述已解析的字串，並且這些範例具有回歸測試涵蓋時，即可視為完成。