parser library for Go (library)

 The goal of this package is to provide a simple, idiomatic and elegant way of
 defining parsers in Go.
 .
 Participle's method of defining grammars should be familiar to any Go
 programmer who has used the encoding/json package: struct field tags define
 what and how input is mapped to those same fields. This is not unusual for Go
 encoders, but is unusual for a parser.
 .
 Participle parsers are LL(k). Among other things, this means that they do not
 support left recursion.
 .
 The default value of K is 1 but this can be controlled with
 participle.UseLookahead(k).
 .
 Left recursion must be eliminated by restructuring your grammar.