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Grm. Grammar ::= Header ";" Abstract ";" [Concrete] ;
Hdr. Header ::= "grammar" CId "(" [CId] ")" ;
Abs. Abstract ::= "abstract" "{" [AbsDef] "}" ;
Cnc. Concrete ::= "concrete" CId "{" [CncDef] "}" ;
Fun. AbsDef ::= CId ":" Type "=" Exp ;
--AFl. AbsDef ::= "%" CId "=" String ; -- flag
Lin. CncDef ::= CId "=" Term ;
--CFl. CncDef ::= "%" CId "=" String ; -- flag
Typ. Type ::= [CId] "->" CId ;
Tr. Exp ::= "(" Atom [Exp] ")" ;
AC. Atom ::= CId ;
AS. Atom ::= String ;
AI. Atom ::= Integer ;
AF. Atom ::= Double ;
AM. Atom ::= "?" ;
trA. Exp ::= Atom ;
define trA a = Tr a [] ;
R. Term ::= "[" [Term] "]" ; -- record/table
P. Term ::= "(" Term "!" Term ")" ; -- projection/selection
S. Term ::= "(" [Term] ")" ; -- sequence with ++
K. Term ::= Tokn ; -- token
V. Term ::= "$" Integer ; -- argument
C. Term ::= Integer ; -- parameter value/label
F. Term ::= CId ; -- global constant
FV. Term ::= "[|" [Term] "|]" ; -- free variation
W. Term ::= "(" String "+" Term ")" ; -- prefix + suffix table
RP. Term ::= "(" Term "@" Term ")"; -- record parameter alias
TM. Term ::= "?" ; -- lin of metavariable
L. Term ::= "(" CId "->" Term ")" ; -- lambda abstracted table
BV. Term ::= "#" CId ; -- lambda-bound variable
KS. Tokn ::= String ;
KP. Tokn ::= "[" "pre" [String] "[" [Variant] "]" "]" ;
Var. Variant ::= [String] "/" [String] ;
terminator Concrete ";" ;
terminator AbsDef ";" ;
terminator CncDef ";" ;
separator CId "," ;
separator Term "," ;
terminator Exp "" ;
terminator String "" ;
separator Variant "," ;
token CId (('_' | letter) (letter | digit | '\'' | '_')*) ;
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