--entrypoints CommandLine, Tree ;

CLine.   CommandLine ::= [Pipe] ;
CEmpty.  CommandLine ::= ;
PComm.   Pipe        ::= [Command] ;
Comm.    Command     ::= Ident [Option] Argument ;
CNoarg.  Command     ::= Ident [Option] ;
OOpt.    Option      ::= "-" Ident ;
OFlag.   Option      ::= "-" Ident "=" Value ;
VId.     Value       ::= Ident ;
VInt.    Value       ::= Integer ;
ATree.   Argument    ::= Tree ;

TApp.    Tree1       ::= Ident [Tree2] ;
TAbs.    Tree        ::= "\\" [Ident] "->" Tree ;
TId.     Tree2       ::= Ident ;
TInt.    Tree2       ::= Integer ; 
TStr.    Tree2       ::= String ; 
TFloat.  Tree2       ::= Double ; 

coercions Tree 2 ;

separator nonempty Pipe ";" ;
separator nonempty Command "|" ;
terminator Option "" ;
terminator nonempty Tree2 "" ;
terminator nonempty Ident "," ;