Re: Is this my failure or of the compiler's debugger

[ldries46 <bertus.dries@planet.nl>]

Op 11-1-2023 om 14:43 schreef Niklas Holsti:
> On 2023-01-11 0:17, ldries46 wrote:
>> Op 10-1-2023 om 19:12 schreef Niklas Holsti:
>>> On 2023-01-10 15:16, ldries46 wrote:
>>>> I try to create a program that read Unbounded strings from a file 
>>>> in the loop:
>>>>        Open(C_File, In_File, To_String(Inp_File));
>>>>        while not End_of_File(C_File) loop
>>>>           str_line_n := To_Unbounded_String(Get_Line(C_File));
>>>>           Buffer_GL.Set_Buffer(str_line_n); -- breakpoint on this line
>>>>           glade_lines := glade_lines + 1;
>>>>        end loop;
>>>>        Close(C_File);
>>>> where str_line_n is of the type Unbounded_String.
>>>> I used a test file with the below presented three text lines:
>>>> Line 1 abcdef9876543210
>>>> Line 2 " abcdef"9876543210
>>>> Line 3 "abc"de"f"9876543210
>>>>
>>>> In the debugger the results were:
>>>> "Line 1 abcdef 9876543210"
>>>> "Line 2 "" abcdef"" 98765432"
>>>> "Line 3 ""abc""de ""f""987654"
>>>
>>>
>>> It seems that the debugger displays the strings in the form of Ada 
>>> string literals, which are enclosed in quotes (") and within which 
>>> each quote character has to be duplicated (to show that it is not 
>>> the terminating quote). So the duplication of the quotes is nothing 
>>> to worry about. If you were to print out the strings (with 
>>> Ada.Text_IO) they should appear just as in the input, with only the 
>>> original quote characters.
>>>
>>> However, your example also shows some extra blank spaces in the 
>>> debugger output, for example:
>>>
>>> Input   : Line 1 abcdef9876543210
>>> Debugger: "Line 1 abcdef 9876543210"
>>>
>>>
>>>
>> Not only that but also some of the  last characters disappear in line 
>> 2 the 10 and in line 3 3210
>
>
> My guess is that these differences are bugs in the debugger's display 
> of strings with embedded quote characters. For Line 1, which has no 
> embedded quotes, the full string is displayed (though with an inserted 
> blank). For Line 2, with two embedded quotes, two of the last 
> characters are not displayed. For Line 3, with four embedded quotes, 
> four of the last characters are not displayed. It seems that the 
> debugger does not realize that doubling the quote characters makes the 
> displayed string longer...
>
> Try to print the strings with Ada.Text_IO instead, that should give 
> the right result. In other words, your code reading the strings works, 
> but the debugger is probably buggy. (One reason why I avoid debuggers 
> whenever I can.)
>
That is also my guess but I like to use the debugger because You stop 
running the program anywhere you want and check all parameters you think 
are nice to know. Now you have to add a lot of code and still see that 
you need tyo know another parameter and run the program over and over 
again each time with other code added.