Proposing a more flexible lexing framework

[mattulbrich]

Intended Change

The syntax highlighting framework in the issue dialog makes the cursor jump around a lot. It does not support KeY files for the moment.

Plan

• Make the "JavaDocument" language-independent
• Implement a corr. Java lexer
• Implement a corr. KeY parser
• Document the changes
• (optional) Make sure the realtime colour update works with the Java version since that may be configured at runtime

The code is there can be reused from other places.

Type of pull request

• Refactoring (behaviour should not change or only minimally change). Actually improvements in the error editor windows.
• New feature (non-breaking change which adds functionality)
• There are changes to the (Java) code
• There are minor improvements in the UI

Ensuring quality

• I made sure that introduced/changed code is well documented (javadoc and inline comments).
• I have tested the feature as follows: tried it out.

The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.19%. Comparing base (cfd8f0f) to head (393374a).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3537      +/-   ##
============================================
- Coverage     38.19%   38.19%   -0.01%     
+ Complexity    17228    17227       -1     
============================================
  Files          2111     2111              
  Lines        127642   127642              
  Branches      21463    21463              
============================================
- Hits          48750    48749       -1     
- Misses        72903    72904       +1     
  Partials       5989     5989              

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[wadoon]

There was a branch (weigl/editor or so), where I had robust editors on the RSyntaxArea component.

@mattulbrich Should/Does the highlighting respect the current JML active (conditional) tags?

[wadoon]

One thing I could find here:

https://git.key-project.org/key/key/-/merge_requests/341

I also found the integrative swing editor with support PSDBG on branch weigl/Scripts.