parse, setstream

simple primitive position, nextchar, skip, goto

terminal matchers char, eos, letter,

compount matchers MatcerSequence, MatcherOr, Repeater may, parallel, any, some, times, times_more, times_less, seplist, seplist_more, seplist_less

null word nullword

compare with definite clause grammar more intuitive, more efficient, more expressive., easier to be read and written

compare with antlr.

compare with lex/yacc

compare with pyparsing,spark,ply,lepl etc.

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