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[nspcc-dev/neofs-node#116] policy: Move files from neofs-node repo

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Took from commit on neofs-node: f81ecbe8db17e63674a47b4b6d49575aced3c16d

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
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Angira Kekteeva 2021-05-20 22:35:03 +03:00
parent 07c8150071
commit 0eeddf6dfe
9 changed files with 1076 additions and 0 deletions
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pkg/policy/doc.go Normal file
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// Package policy provides facilities for creating policy from SQL-like language.
// eBNF grammar is provided in `grammar.ebnf` for illustration.
//
// Current limitations:
// 1. Grouping filter expressions in parenthesis is not supported right now.
// Requiring this will make query too verbose, making it optional makes
// our grammar not LL(1). This can be supported in future.
// 2. Filters must be defined before they are used.
// This requirement may be relaxed in future.
//
// Example query:
// REP 1 in SPB
// REP 2 in Americas
// CBF 4
// SELECT 1 Node IN City FROM SPBSSD AS SPB
// SELECT 2 Node IN SAME City FROM Americas AS Americas
// FILTER SSD EQ true AS IsSSD
// FILTER @IsSSD AND Country eq "RU" AND City eq "St.Petersburg" AS SPBSSD
// FILTER 'Continent' == 'North America' OR Continent == 'South America' AS Americas
package policy