Use string scanner with baseparser #154

Job	Run time
Gem: 3.0 on ubuntu-latest	13s
Gem: head on ubuntu-latest	9s
Document	22s
Gem: 3.0 on macos-latest	21s
Gem: head on macos-latest	10s
Gem: 3.0 on windows-latest	1m 11s
Gem: head on windows-latest	1m 3s
ruby-versions / Generate Ruby versions	3s
Inplace: 2.5 on ubuntu-latest	21s
Inplace: 2.6 on ubuntu-latest	23s
Inplace: 2.7 on ubuntu-latest	24s
Inplace: 3.0 on ubuntu-latest	14s
Inplace: 3.1 on ubuntu-latest	16s
Inplace: 3.2 on ubuntu-latest	14s
Inplace: 3.3 on ubuntu-latest	14s
Inplace: head on ubuntu-latest	10s
Inplace: jruby on ubuntu-latest	44s
Inplace: jruby-head on ubuntu-latest	46s
Inplace: 2.5 on macos-latest	50s
Inplace: 2.6 on macos-latest	50s
Inplace: 2.7 on macos-latest	52s
Inplace: 3.0 on macos-latest	26s
Inplace: 3.1 on macos-latest	25s
Inplace: 3.2 on macos-latest	24s
Inplace: 3.3 on macos-latest	27s
Inplace: head on macos-latest	14s
Inplace: jruby on macos-latest	51s
Inplace: jruby-head on macos-latest	47s
Inplace: 2.5 on windows-latest	2m 17s
Inplace: 2.6 on windows-latest	2m 36s
Inplace: 2.7 on windows-latest	1m 59s
Inplace: 3.0 on windows-latest	1m 15s
Inplace: 3.1 on windows-latest	1m 49s
Inplace: 3.2 on windows-latest	1m 57s
Inplace: 3.3 on windows-latest	3m 26s
Inplace: head on windows-latest	1m 12s
Inplace: jruby on windows-latest	1m 40s
Inplace: jruby-head on windows-latest	1m 32s
	33m 7s

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