Use string scanner with baseparser #151

Job	Run time
Document	22s
Gem: 3.0 on ubuntu-latest	11s
Gem: head on ubuntu-latest	10s
Gem: 3.0 on macos-latest	22s
Gem: head on macos-latest	18s
Gem: 3.0 on windows-latest	1m 3s
Gem: head on windows-latest	1m 3s
ruby-versions / Generate Ruby versions	3s
Inplace: 2.5 on ubuntu-latest	23s
Inplace: 2.6 on ubuntu-latest	28s
Inplace: 2.7 on ubuntu-latest	25s
Inplace: 3.0 on ubuntu-latest	12s
Inplace: 3.1 on ubuntu-latest	12s
Inplace: 3.2 on ubuntu-latest	11s
Inplace: 3.3 on ubuntu-latest	11s
Inplace: head on ubuntu-latest	11s
Inplace: jruby on ubuntu-latest	43s
Inplace: jruby-head on ubuntu-latest	46s
Inplace: 2.5 on macos-latest	47s
Inplace: 2.6 on macos-latest	53s
Inplace: 2.7 on macos-latest	46s
Inplace: 3.0 on macos-latest	18s
Inplace: 3.1 on macos-latest	17s
Inplace: 3.2 on macos-latest	27s
Inplace: 3.3 on macos-latest	29s
Inplace: head on macos-latest	21s
Inplace: jruby on macos-latest	43s
Inplace: jruby-head on macos-latest	1m 6s
Inplace: 2.5 on windows-latest	3m 3s
Inplace: 2.6 on windows-latest	3m 0s
Inplace: 2.7 on windows-latest	1m 33s
Inplace: 3.0 on windows-latest	1m 26s
Inplace: 3.1 on windows-latest	1m 31s
Inplace: 3.2 on windows-latest	1m 46s
Inplace: 3.3 on windows-latest	1m 34s
Inplace: head on windows-latest	1m 15s
Inplace: jruby on windows-latest	1m 43s
Inplace: jruby-head on windows-latest	2m 9s
	32m 21s

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