46 lines
1.3 KiB
ANTLR
46 lines
1.3 KiB
ANTLR
parser grammar Query;
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options {
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tokenVocab = QueryLexer;
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}
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policy: repStmt+ cbfStmt? selectStmt* filterStmt* EOF;
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repStmt:
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REP Count = NUMBER1 // number of object replicas
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(IN Selector = ident)?; // optional selector name
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cbfStmt: CBF BackupFactor = NUMBER1; // container backup factor
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selectStmt:
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SELECT Count = NUMBER1 // number of nodes to select without container backup factor *)
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(IN clause? Bucket = ident)? // bucket name
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FROM Filter = identWC // filter reference or whole netmap
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(AS Name = ident)? // optional selector name
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;
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clause: CLAUSE_SAME | CLAUSE_DISTINCT; // nodes from distinct buckets
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filterExpr:
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F1 = filterExpr Op = AND_OP F2 = filterExpr
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| F1 = filterExpr Op = OR_OP F2 = filterExpr
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| '(' Inner = filterExpr ')'
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| expr
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;
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filterStmt:
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FILTER Expr = filterExpr
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AS Name = ident // obligatory filter name
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;
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expr:
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AT Filter = ident // reference to named filter
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| Key = filterKey SIMPLE_OP Value = filterValue // attribute comparison
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;
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filterKey : ident | STRING;
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filterValue : ident | number | STRING;
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number : ZERO | NUMBER1;
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keyword : REP | IN | AS | SELECT | FROM | FILTER;
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ident : keyword | IDENT;
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identWC : ident | WILDCARD;
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