G2++ Tutorial - G2++(3C++)

Language Syntax

The set of possible G2 records is expressed by the following (non context-free) grammar:

   record     => group nl
   group      => name value
   	  name value nl indent group
   
   value      => ht string nl
   	  nl indent group
   	  nl indent array
   array      => index value
   	  index value nl indent array

where

ht is an ASCII tab character (011)
nl is an ASCII newline character (012)
name is any valid C++ identifier
index is a non-negative integer
string is any sequence of printable ASCII characters, as defined by the UNIX isprint(3) function.
indent is one or more tabs, the exact number depending on the depth of recursion in the definition.

The highest level name begins at the left margin (indentation level zero). Values (other than simple strings, which are separated from their names by tab) are indented one level more deeply than their parent groups. Note that two consecutive newlines always terminate a G2 record.