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|
grammar ExprGrammar;
options {
language = Java;
}
COMPAREOP : '==' | '!=' | '>' | '<' | '>=' | '<=';
RELOP : 'and' | 'or';
ADDOP : '+' | '-';
MULTOP : '/' | '*';
NUMBER : ('0'..'9')+;
STRING : '\'' ~[\']* '\'';
IDENTIFIER : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_'|'-')*;
// CONTEXT_VAR : '$' IDENTIFIER;
WS: [ \n\t\r]+ -> skip;
constant : NUMBER | STRING ;
variableLead : ('$')? variableTerm ;
variableTerm : IDENTIFIER ('[' expr ']')? ;
variable : variableLead ('.' variableTerm)* ('.')?;
// variable : CONTEXT_VAR ( '[' expr ']' )? ('.' IDENTIFIER )? ;
atom : constant | variable;
expr : atom
| parenExpr
| multExpr
| addExpr
| compareExpr
| relExpr
| funcExpr;
parenExpr : '(' expr ')';
term : atom | parenExpr | funcExpr;
multExpr : term (MULTOP term)*;
addExpr : multExpr (ADDOP multExpr)*;
compareExpr : addExpr COMPAREOP addExpr;
relExpr : compareExpr (RELOP expr)*;
funcExpr : IDENTIFIER '(' expr (',' expr)* ')';
|
