Brief

Library to scan doubly-bracketed values in form of [[...]]

1. from annotated production rules of parsergen's input:

   <Line> ::= <NewLexIds>              [[]]
   <Line> ::= <OperatorAssociation>    [[
       auto &c = $c;
       if (!c.testCond())
           return;
   
       $1.m_attr.disown(); // not a pointer
       c.incWeight();
   ]]

2. from option definitions of both parsergen and scannergen's inputs:

   %HEADERS_FOR_CPP     [[
   #include "ParserIdDef.h"
   
   // %HEADERS_FOR_SCANNER_CPP expanded BEGIN
   #include "BracketBalance.h"
   // %HEADERS_FOR_SCANNER_CPP expanded END
   ]]