Improve performance of StructuredParser::parse() method

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#476

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (0ba4748) to head (426f4ac).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #478      +/-   ##
============================================
- Coverage     96.67%   96.66%   -0.02%     
+ Complexity      407      402       -5     
============================================
  Files            66       66              
  Lines          1202     1198       -4     
============================================
- Hits           1162     1158       -4     
  Misses           40       40              

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