mirror of
https://github.com/neilotoole/sq.git
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184 lines
3.1 KiB
ANTLR
184 lines
3.1 KiB
ANTLR
grammar SLQ;
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// "@mysql_db1 | .user, .address | join(.user.uid == .address.uid) | .[0:3] | .uid, .username, .country"
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stmtList
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: ';'* query ( ';'+ query )* ';'*
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;
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query: segment ('|' segment)* ;
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segment: (element) (',' element)* ;
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element: dsTblElement | dsElement | selElement | join | group | rowRange | fn | expr;
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cmpr: LT_EQ | LT | GT_EQ | GT | EQ | NEQ ;
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//whereExpr
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// : expr
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// ;
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fn: fnName '(' ( expr ( ',' expr )* | '*' )? ')';
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join
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: ('join'|'JOIN'|'j')
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'(' joinConstraint ')'
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;
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joinConstraint
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: SEL cmpr SEL // .user.uid == .address.userid
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| SEL // .uid
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;
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group
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: ('group'|'GROUP'|'g')
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'(' SEL (',' SEL)* ')'
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;
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selElement: SEL;
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dsTblElement: DATASOURCE SEL; // data source table element, e.g. @my1.user
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dsElement: DATASOURCE; // data source element, e.g. @my1
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// [] select all rows
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// [10] select row 10
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// [10:15] select rows 10 thru 15
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// [0:15] select rows 0 thru 15
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// [:15] same as above (0 thru 15)
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// [10:] select all rows from 10 onwards
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rowRange
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: '.['
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( NN COLON NN // [10:15]
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| NN COLON // [10:]
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| COLON NN // [:15]
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| NN // [10]
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)? ']'
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;
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fnName
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: 'sum' | 'SUM'
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| 'avg' | 'AVG'
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| 'count' | 'COUNT'
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| 'where' | 'WHERE'
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;
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expr
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: SEL
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| literal
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| unaryOperator expr
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| expr '||' expr
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| expr ( '*' | '/' | '%' ) expr
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| expr ( '+' | '-' ) expr
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| expr ( '<<' | '>>' | '&' ) expr
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| expr ( '<' | '<=' | '>' | '>=' ) expr
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| expr ( '==' | '!=' | ) expr
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| expr '&&' expr
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| fn
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// | fnName '(' ( expr ( ',' expr )* | '*' )? ')'
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;
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literal
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: NN
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| NUMBER
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| STRING
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| NULL
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;
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unaryOperator
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: '-'
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| '+'
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| '~'
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| '!'
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;
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ID: [a-zA-Z_][a-zA-Z0-9_]* ;
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WS : [ \t\r\n]+ -> skip ;
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LPAR : '(' ;
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RPAR: ')';
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LBRA: '[' ;
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RBRA: ']';
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COMMA: ',';
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PIPE: '|' ;
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COLON: ':';
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NULL: 'null' | 'NULL';
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NN: INTF; // NN: Natural Number {0,1,2,3, ...}
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NUMBER
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: NN
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| '-'? INTF '.' [0-9]+ EXP? // 1.35, 1.35E-9, 0.3, -4.5
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| '-'? INTF EXP // 1e10 -3e4
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| '-'? INTF // -3, 45
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;
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fragment INTF : '0' | [1-9] [0-9]* ; // no leading zeros
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fragment EXP : [Ee] [+\-]? INTF ; // \- since - means "range" inside [...]
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LT_EQ : '<=';
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LT : '<';
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GT_EQ : '>=';
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GT : '>';
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NEQ : '!=';
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EQ : '==';
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SEL: '.' ID ('.' ID)*; // SEL can be .THING or .THING.OTHERTHING etc.
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DATASOURCE: '@' ID; // DS (Data Source): @mydb1 or @postgres_db2 etc.
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STRING : '"' (ESC | ~["\\])* '"' ;
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fragment ESC : '\\' (["\\/bfnrt] | UNICODE) ;
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fragment UNICODE : 'u' HEX HEX HEX HEX ;
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fragment HEX : [0-9a-fA-F] ;
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//NUMERIC_LITERAL
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// : DIGIT+ ( '.' DIGIT* )? ( E [-+]? DIGIT+ )?
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// | '.' DIGIT+ ( E [-+]? DIGIT+ )?
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// ;
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fragment DIGIT : [0-9];
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fragment A : [aA];
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fragment B : [bB];
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fragment C : [cC];
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fragment D : [dD];
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fragment E : [eE];
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fragment F : [fF];
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fragment G : [gG];
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fragment H : [hH];
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fragment I : [iI];
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fragment J : [jJ];
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fragment K : [kK];
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fragment L : [lL];
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fragment M : [mM];
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fragment N : [nN];
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fragment O : [oO];
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fragment P : [pP];
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fragment Q : [qQ];
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fragment R : [rR];
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fragment S : [sS];
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fragment T : [tT];
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fragment U : [uU];
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fragment V : [vV];
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fragment W : [wW];
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fragment X : [xX];
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fragment Y : [yY];
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fragment Z : [zZ];
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LINECOMMENT: '//' .*? '\n' -> skip ; |