package policy import ( "github.com/alecthomas/participle" ) var parser *participle.Parser func init() { p, err := participle.Build(&query{}) if err != nil { panic(err) } parser = p } type query struct { Replicas []*replicaStmt `@@+` CBF uint32 `("CBF" @Int)?` Selectors []*selectorStmt `@@*` Filters []*filterStmt `@@*` } type replicaStmt struct { Count int `"REP" @Int` Selector string `("IN" @Ident)?` } type selectorStmt struct { Count uint32 `"SELECT" @Int` Bucket []string `("IN" @(("SAME" | "DISTINCT")? Ident))?` Filter string `"FROM" @(Ident | "*")` Name string `("AS" @Ident)?` } type filterStmt struct { Value *orChain `"FILTER" @@` Name string `"AS" @Ident` } type filterOrExpr struct { Reference string `"@"@Ident` Expr *simpleExpr `| @@` } type orChain struct { Clauses []*andChain `@@ ("OR" @@)*` } type andChain struct { Clauses []*filterOrExpr `@@ ("AND" @@)*` } type simpleExpr struct { Key string `@Ident` // We don't use literals here to improve error messages. Op string `@Ident` Value string `@(Ident | String | Int)` }