StdStamps & backward compatibility

[Zinn]

My question is: Should BlackBox 1.7 backward compatible to BlackBox 1.6 or not?

Robert has improved the module StdStamps. And we had the following disscussion.

Helmut:
Deleting the backward compatibility makes this module StdStamps much easier.

We do not need the procedure HasWideChars and simplify the logic
                i := 0;
                WHILE (i < v.nentries)
                & ~((v.history.comment # NIL) & HasWideChars(v.history.comment)) DO INC(i) END;
                IF i < v.nentries THEN version := thisVersion ELSE version := 2 END;
                wr.WriteVersion(version);
to
                wr.WriteVersion(ThisVersion);

and simplify the logic
                 IF version = thisVersion THEN
                     wr.WriteString(v.history.comment^)
                 ELSE
                     wr.WriteXString(v.history.comment^)
                 END
to
                 wr.WriteString(v.history.comment^)

But then you can't load an edit module with old versions of BB, because it can't read the new format.
The current logic of StdStamps is: If the comments use Unicode write the new format otherwise write the old format.
We have the same problem with StdLinks and StdFolds. When we use Unicode there then the old BB can't open the document file.
Russian people will use Unicode (Cyrillic letters) in Stamps, Folds, Links and Identifier. And those modules are not useable with the old versions of BB.
Anyway, the best way is to leave it as it is currently. We can simplify the logic of StdStamps, StdLinks and StdFolds in the future.

Robert:
I disagree. We should decide what is more important: Compatibility with BBox 1.6 or Unicode. I understand why Unicode is necessary at 1.7, so back compatibility is lost.

Now it is simple. The new module always writes version 3 & Unicode, and does not need HasWideChars .
It can read both version 2 (ASCII) & 3 (Unicode).
The code is much simplified.
It is also simple to explain what happens in the Docu file. It is easy for users to understand what the code does.
-----------------------------------------------------------------------------------------------------------------------------------------------

Remember my question is: Should BlackBox 1.7 backward compatible to BlackBox 1.6 or not?

[Josef Templ]

> Remember my question is: Should BlackBox 1.7 backward compatible to BlackBox 1.6 or not?

It MUST be compatible in the sense that old documents can be loaded into the new version.

That is exactly the reason for the version field in an elem.
You may introduce a new version code with improved features, but you are NOT allowed to
change an existing version in a way that makes it incompatible with existing documents.

Compatibility with old documents is much more important than saving a few lines of code.

- Josef

[Robert]

Compatibility with old documents is much more important than saving a few lines of code.

That is not the issue here. Old Stamps can definitely be properly read by the new code.


The issue is can old BlackBox 1.6 code properly read new Stamps - it can read and save them as Aliens.

There are three options:

- Yes, but then you can't use 16 bit characters in comments.

- No, but 16-bit comments are always supported.

- Sometimes. Yes if no comments contain 16 bit characters, no otherwise.


I personally think the last option is the worst as it is complicated and unpredictable.

[cfbsoftware]

That is not the issue here. Old Stamps can definitely be properly read by the new code.

In that case they are 'backward compatible'. I do not believe there is any need for 'forward compatibility'. If it comes at no cost all well and good but otherwise it should not even be a consideration.

[Robert]

Is this accepted terminology:
- Backward compatibility: Old documents & new code
- Forward compatibility: New documents & old code?

If so, we should rename this topic StdStamps & forward compatibility.
It is certainly less confusing to have two different names for these two different ideas.


Is this accepted policy for forward compatibility?

Chris wrote:
If it comes at no cost all well and good but otherwise it should not even be a consideration.

Helmut: If we go for the StdStamps option:
- Backward compatibility - yes
- Forward compatibility - no
- Simplicity - yes
it might be better to use the same policy for the other Modules you mentioned (Folds & Links). (I haven't looked at them in detail myself.)

[Robert]

I attach a proposal for updating the Module StdStamps, and hope it can be considered for the new Centre release.

This module has back compatibility with BlackBox 1.6, but not forwards compatibility as these terms are defined above.

Comments in the Stamps support 16-bit characters.

I would describe the changes as 90% bug fix, and 10% new feature. The bugs were described in correspondence in the BlackBox email list (Archives dated Jan & Feb 2015).
The change comments in the Mod file give additional information.


This version of the Module has been carefully checked by Helmut, whom I thank for making constructive comments.

The coding below contains 3 files; the Mod, Docu, & Rsrc. I am happy to provide them in alternative formats, but probably would need extensive assistance to put them in the repository correctly!

Code: Select all

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