21 lines
861 B
Go
21 lines
861 B
Go
// 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
|