simplify lexer

[ichiban]

No description provided.

[codecov-commenter]

Codecov Report

Merging #143 (4cd1660) into main (d807577) will increase coverage by 1.28%.
The diff coverage is 99.46%.

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   92.19%   93.47%   +1.28%     
==========================================
  Files          18       18              
  Lines        5126     5092      -34     
==========================================
+ Hits         4726     4760      +34     
+ Misses        349      284      -65     
+ Partials       51       48       -3     

Impacted Files	Coverage Δ
engine/parser.go	94.71% <66.66%> (ø)
engine/lexer.go	100.00% <100.00%> (+12.12%)	⬆️

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