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/**
* Define a grammar called AAIDsl
*/
grammar AAIDsl;
aaiquery: dslStatement;
dslStatement: (queryStep) (traverseStep | unionTraverseStep)* limitStep*;
queryStep : (singleNodeStep |singleQueryStep | multiQueryStep);
unionQueryStep: LBRACKET dslStatement ( COMMA (dslStatement))* RBRACKET;
traverseStep: (TRAVERSE ( queryStep | unionQueryStep));
unionTraverseStep: TRAVERSE unionQueryStep;
singleNodeStep: NODE STORE? ;
singleQueryStep: NODE STORE? (filterStep | filterTraverseStep);
multiQueryStep: NODE STORE? (filterStep | filterTraverseStep) (filterStep)+;
filterStep: NOT? (LPAREN KEY COMMA KEY (COMMA KEY)*RPAREN);
filterTraverseStep: (LPAREN traverseStep* RPAREN);
limitStep: LIMIT NODE;
LIMIT: 'LIMIT';
NODE: ID;
KEY: ['] ID ['] ;
AND: [&];
STORE: [*];
OR: [|];
TRAVERSE: [>] ;
LPAREN: [(];
RPAREN: [)];
COMMA: [,] ;
EQUAL: [=];
LBRACKET: [[];
RBRACKET: [\]];
NOT: [!];
VALUE: DIGIT;
fragment LOWERCASE : [a-z] ;
fragment UPPERCASE : [A-Z] ;
fragment DIGIT : [0-9] ;
ID
: ( LOWERCASE | UPPERCASE | DIGIT) ( LOWERCASE | UPPERCASE | DIGIT | '-' |'.' |'_')*
;
WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
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