Add some methods + debug when missing key

[linuxpham]

[codecov[bot]]

Codecov Report

Attention: 40 lines in your changes are missing coverage. Please review.

Comparison is base (6dae91c) 97.11% compared to head (7a11a73) 93.22%. Report is 2 commits behind head on master.

:exclamation: Current head 7a11a73 differs from pull request most recent head cdd1437. Consider uploading reports for the commit cdd1437 to get more accurate results

Files	Patch %	Lines
parser.go	18.36%	40 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   97.11%   93.22%   -3.89%     
==========================================
  Files           9        9              
  Lines        1073     1122      +49     
==========================================
+ Hits         1042     1046       +4     
- Misses         22       65      +43     
- Partials        9       11       +2     

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