52 lines
1.1 KiB
EBNF
52 lines
1.1 KiB
EBNF
Policy ::=
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RepStmt, [RepStmt],
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CbtStmt?,
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[SelectStmt],
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[FilterStmt],
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;
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RepStmt ::=
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'REP', Number1, (* number of object replicas *)
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('AS', Ident)? (* optional selector name *)
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;
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CbtStmt ::= 'CBF', Number1 (* container backup factor *)
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;
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SelectStmt ::=
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'SELECT', Number1, (* number of nodes to select without container backup factor *)
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('IN', Clause?, Ident)?, (* bucket name *)
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FROM, (Ident | '*'), (* filter reference or whole netmap *)
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('AS', Ident)? (* optional selector name *)
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;
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Clause ::=
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'SAME' (* nodes from the same bucket *)
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| 'DISTINCT' (* nodes from distinct buckets *)
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;
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FilterStmt ::=
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'FILTER', AndChain, ['OR', AndChain],
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'AS', Ident (* obligatory filter name *)
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;
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AndChain ::=
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Expr, ['AND', Expr]
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;
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Expr ::=
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'@' Ident (* filter reference *)
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| Ident, Op, Value (* attribute filter *)
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;
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Op ::= 'EQ' | 'NE' | 'GE' | 'GT' | 'LT' | 'LE'
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;
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Value ::= Ident | Number | String
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;
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Number1 ::= Digit1 [Digit];
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Number ::= Digit [Digit];
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Digit1 ::= '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' ;
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Digit ::= '0' | Digit1;
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