get rid of control flows in parse input

[arjunsavel]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 28.43%. Comparing base (757be58) to head (6cbe1b3).
Report is 15 commits behind head on main.

Files	Patch %	Lines
src/scope/io.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   26.92%   28.43%   +1.50%     
==========================================
  Files          11       11              
  Lines         780      795      +15     
==========================================
+ Hits          210      226      +16     
+ Misses        570      569       -1     

Flag	Coverage Δ
unittests	28.43% <93.75%> (+1.50%)	⬆️

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