3e0f9b8a
 Francisco Coelho
back to work?
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Id ::= [a-z] [A-Za-z0-9_]*
Variable ::= [A-Z] [A-Za-z0-9_]*
StringConstant ::= \"([^\"] | \\\")\"
SymbolicConstant ::= [a-z] [A-Za-z0-9_]*
AnonymousVariable ::= "_"
Number ::= 0 | [1-9][0-9]*
VariableTerm ::= Variable | AnonymousVariable
GroundTerm ::= SymbolicConstant | StringConstant | "-"? Number
BasicTerm ::= GroundTerm | VariableTerm
BasicTerms ::= BasicTerm ("," BasicTerm)*
ArithOp ::= "+" | "-" | "*" | "/"
Term ::= Id ("(" Terms? ")")?
| Number
| StringConstant
| Variable
| AnonymousVariable
| "(" Term ")"
| "-" Term
| Term ArithOp Term
Terms ::= Term ("," Term)*
BinOp ::= "<" | "<=" | "=" | "!=" | ">" | ">="
BuiltinAtom ::= Term BinOp Term
ClassicalLiteral ::= "-"? SymbolicConstant ("(" Terms? ")")?
NafLiteral ::= "not"? ClassicalLiteral | BuiltinAtom
NafLiterals ::= NafLiteral ("," NafLiteral)*
WeightAtLevel ::= Term ("@" Term)? ("," Terms)?
AggregateFunction ::= "#count" | "#sum" | "#max" | "#min"
AggregateElement ::= BasicTerms? (":" NafLiterals?)?
AggregateElements ::= AggregateElement (";" AggregateElement)*
Aggregate ::= (Term BinOp)? AggregateFunction "{" AggregateElements? "}" (BinOp Term)?
ChoiceElement ::= ClassicalLiteral (":" NafLiterals?)?
ChoiceElements ::= ChoiceElement (";" ChoiceElement)*
Choice ::= (Term BinOp)? "{" ChoiceElements? "}" (BinOp Term)?
Disjunction ::= ClassicalLiteral ("|" ClassicalLiteral)*
Body ::= (Body ",")? (NafLiteral | "not"? Aggregate)
Head ::= Disjunction | Choice
Statement ::= ":-" Body? "."
| Head (":-" Body?)? "."
| ":~" Body? "." "[" WeightAtLevel "]"
Query ::= ClassicalAtom "?"
Statements ::= Statement+
Program ::= Statements? Query?
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