github.com/ari-anchor/sei-tendermint@v0.0.0-20230519144642-dc826b7b56bb/internal/pubsub/query/syntax/doc.go (about) 1 // Package syntax defines a scanner and parser for the Tendermint event filter 2 // query language. A query selects events by their types and attribute values. 3 // 4 // Grammar 5 // 6 // The grammar of the query language is defined by the following EBNF: 7 // 8 // query = conditions EOF 9 // conditions = condition {"AND" condition} 10 // condition = tag comparison 11 // comparison = equal / order / contains / "EXISTS" 12 // equal = "=" (date / number / time / value) 13 // order = cmp (date / number / time) 14 // contains = "CONTAINS" value 15 // cmp = "<" / "<=" / ">" / ">=" 16 // 17 // The lexical terms are defined here using RE2 regular expression notation: 18 // 19 // // The name of an event attribute (type.value) 20 // tag = #'\w+(\.\w+)*' 21 // 22 // // A datestamp (YYYY-MM-DD) 23 // date = #'DATE \d{4}-\d{2}-\d{2}' 24 // 25 // // A number with optional fractional parts (0, 10, 3.25) 26 // number = #'\d+(\.\d+)?' 27 // 28 // // An RFC3339 timestamp (2021-11-23T22:04:19-09:00) 29 // time = #'TIME \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}([-+]\d{2}:\d{2}|Z)' 30 // 31 // // A quoted literal string value ('a b c') 32 // value = #'\'[^\']*\'' 33 // 34 package syntax