frostfs-sdk-go/netmap/parser/Query.g4

54 lines
1.5 KiB
Text
Raw Normal View History

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