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//eol  '+' lf  '+' tab
El ::= CompositeExpression  ( CompositeExpression  )*
CompositeExpression ::=  ( "${" Value '}'  | "#{" Value '}'  )
Value ::= Expression  ( '?' Expression ':' Expression  )?
Expression ::= SimpleExpression  ( RelOp SimpleExpression  )?
SimpleExpression ::=  ( UnaryOp  )? Term  ( AddOp Term  )*
Term ::= Factor  ( MulOp Factor  )*
Factor ::= Number  | String  | "true"  | "false"  |  ( "null"  | "nil"  )  |  ( '!'  | "not"  ) Factor  | '(' Expression ')'  | Designator  ( Parameters  )?
Designator ::=  ( '.' Identifier  | '[' Expression ']'  )*
Parameters ::= '('  ( Expression  ( ',' Expression  )*  )? ')'
Number ::= Int  | HexInt  | Float
AddOp ::= '+'  | '-'  |  ( "or"  | "||"  )
UnaryOp ::= '-'  | "empty"
MulOp ::=  ( "and"  | "&&"  )  | '*'  | '/'  | "div"  |  ( '%'  | "mod"  )
RelOp ::=  ( '>'  | "gt"  )  |  ( '<'  | "lt"  )  |  ( ">="  | "ge"  )  |  ( "<="  | "le"  )  |  ( '='  | "=="  | "eq"  )  |  ( "!="  | "<>"  | "ne"  )

eol ::= '\r'
lf ::= '\n'
tab ::= '\t'
char ::= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
letter ::= "_"  '+' char
digit ::= "0123456789"
hexDigit ::= digit  '+' "ABCDEF"  '+' "abcdef"
noQuote ::= ANY  '-' "'"  '-' eol
noApos ::= ANY  '-' '"'  '-' eol
noBrackets ::= ANY  '-' "${"  '-' "#{"
apos ::= '"'
quote ::= "'"
Identifier  ::= letter  ( letter  | digit  )*
Int  ::= digit  ( digit  )*
HexInt  ::= '0'  ( 'x'  | 'X'  ) hexDigit  ( hexDigit  )*
Float  ::= digit  ( digit  )* '.'  ( digit  )*  (  ( 'E'  | 'e'  )  ( '+'  | '-'  )? digit  ( digit  )*  )?
String  ::=  ( '"'  ( '\' '0'  ( 'x'  | 'X'  ) hexDigit  ( hexDigit  )?  | '\'  ( 't'  | 'b'  | 'n'  | 'r'  | 'f'  | "'"  | '"'  | '\'  )  | noApos  ) '"'  )  |  ( "'"  ( '\' '0'  ( 'x'  | 'X'  ) hexDigit  ( hexDigit  )?  | "'"  ( 't'  | 'b'  | 'n'  | 'r'  | 'f'  | "'"  | '"'  | '\'  )  | noQuote  ) "'"  )