fix parser errors and refactored error handling

[AlexHaxe]

No description provided.

[codecov-io]

Codecov Report

Merging #413 into dev will decrease coverage by 0.31%.
The diff coverage is 66.83%.

@@            Coverage Diff            @@
##             dev     #413      +/-   ##
=========================================
- Coverage   91.1%   90.79%   -0.32%     
=========================================
  Files        122      124       +2     
  Lines       8367     8492     +125     
  Branches     304      327      +23     
=========================================
+ Hits        7623     7710      +87     
- Misses       476      497      +21     
- Partials     268      285      +17

Impacted Files	Coverage Δ
src/checkstyle/token/walk/WalkFieldDef.hx	100% <ø> (ø)	⬆️
src/checkstyle/Checker.hx	88.06% <0%> (+3.3%)	⬆️
src/checkstyle/checks/block/RightCurlyCheck.hx	96.96% <0%> (-0.5%)	⬇️
src/checkstyle/checks/Check.hx	89.47% <0%> (+1.65%)	⬆️
src/checkstyle/checks/coding/ReturnCountCheck.hx	95.74% <0%> (-2.09%)	⬇️
src/checkstyle/token/walk/WalkTypeNameDef.hx	97.05% <100%> (+0.28%)	⬆️
src/checkstyle/token/walk/WalkStatement.hx	97.59% <100%> (+1.83%)	⬆️
src/checkstyle/token/walk/WalkBlock.hx	100% <100%> (ø)	⬆️
src/checkstyle/token/walk/WalkNew.hx	100% <100%> (ø)	⬆️
src/checkstyle/token/walk/WalkAt.hx	85.71% <41.66%> (-14.29%)	⬇️
... and 12 more

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