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/**
* Define a parser grammar called AAIDsl
*/
grammar AAIDsl;
aaiquery: startStatement limit?;
startStatement: (vertex|unionVertex ) (traversal)* ;
nestedStatement: (traversal)+ ;
vertex: label store? (filter)?;
//traversal: ( vertex|unionVertex edge);
traversal: (edge* (vertex|unionVertex));
filter: (selectFilter)* (propertyFilter)* whereFilter*;
propertyFilter: (not? '(' key (',' (key | num | bool))* ')');
selectFilter: ( '{' key (',' key)* '}');
bool: BOOL;
whereFilter: (not? '(' nestedStatement ')' );
//unionVertex: '[' ( nestedStatement ( comma (nestedStatement))*) ']' store?;
unionVertex: '[' ( (edgeFilter)* nestedStatement ( comma ( (edgeFilter)* nestedStatement))*) ']' store?;
comma: ',';
edge: ( TRAVERSE|DIRTRAVERSE) (edgeFilter)?;
edgeFilter: '(' key (',' key )* ')';
num: NUM;
limit: LIMIT num;
label: (ID | NUM )+;
key: KEY;
store: STORE | selectFilter;
not: NOT;
BOOL: 'true'|'TRUE'|'false'|'FALSE';
LIMIT: 'LIMIT'|'limit';
NUM: (DIGIT)+;
/*NODE: (ID | NUM )+;*/
fragment ESCAPED_QUOTE : '\\' '\'';
KEY : '\'' (ESCAPED_QUOTE | ~[\r\n] )*? '\'';
AND: [&];
STORE: [*];
OR: [|];
DIRTRAVERSE: '>>' | '<<' ;
TRAVERSE: '>' ;
EQUAL: [=];
NOT: [!];
fragment LOWERCASE : [a-z] ;
fragment UPPERCASE : [A-Z] ;
fragment DIGIT : [0-9] ;
fragment ESC : '\\' . ;
fragment ID_SPECIALS: [-:_];
ID
: ( LOWERCASE | UPPERCASE | DIGIT | ID_SPECIALS)
;
WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
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