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34 lines
1.1 KiB
34 lines
1.1 KiB
// Package syntax defines a scanner and parser for the Tendermint event filter
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// query language. A query selects events by their types and attribute values.
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//
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// Grammar
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//
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// The grammar of the query language is defined by the following EBNF:
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//
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// query = conditions EOF
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// conditions = condition {"AND" condition}
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// condition = tag comparison
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// comparison = equal / order / contains / "EXISTS"
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// equal = "=" (date / number / time / value)
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// order = cmp (date / number / time)
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// contains = "CONTAINS" value
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// cmp = "<" / "<=" / ">" / ">="
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//
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// The lexical terms are defined here using RE2 regular expression notation:
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//
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// // The name of an event attribute (type.value)
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// tag = #'\w+(\.\w+)*'
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//
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// // A datestamp (YYYY-MM-DD)
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// date = #'DATE \d{4}-\d{2}-\d{2}'
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//
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// // A number with optional fractional parts (0, 10, 3.25)
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// number = #'\d+(\.\d+)?'
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//
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// // An RFC3339 timestamp (2021-11-23T22:04:19-09:00)
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// time = #'TIME \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}([-+]\d{2}:\d{2}|Z)'
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//
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// // A quoted literal string value ('a b c')
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// value = #'\'[^\']*\''
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//
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package syntax
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