tools for the most simple parts of the PEG definition.

None of these components a priori generate parsers.

The following components are defined here:

Range           <- Char '-' Char / Char
Char            <- '\' [abefnrtv'"[]\]
                 / '\' [0-3][0-7][0-7]
                 / '\' [0-7][0-7]?
                 / '\' '-'
                 / !'\' .
Spacing         <- ( Space / Comment )*
Comment         <- '#' ( !EndOfLine . )* EndOfLine
Space           <- ' ' / '	' / EndOfLine
EndOfLine       <- '
' / '
' / '
'
EndOfFile       <- !.