On 16/08/2014, 7:32 PM, kevin2059 wrote: > HOW can I get a completely BNF description for R? I try to write a parser for R now. The R grammar is defined in the src/main/gram.y file (in Bison format). You can get that file from https://svn.r-project.org/R/trunk/src/main/gram.y. Duncan Murdoch