43 lines
979 B
Go
43 lines
979 B
Go
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package rql
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import (
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"github.com/alecthomas/participle/v2"
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"github.com/alecthomas/participle/v2/lexer"
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)
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var (
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rqlLexer = lexer.MustSimple([]lexer.SimpleRule{
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{Name: "whitespace", Pattern: `\s+`},
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{Name: "String", Pattern: `"[^"]*"`},
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{Name: "Ident", Pattern: `[a-zA-Z_][a-zA-Z_0-9]*`},
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{Name: "Punct", Pattern: `[-[!@#$%^&*()+_={};':",.<>?/]|]`},
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})
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rqlParser = participle.MustBuild[Query](
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participle.Lexer(rqlLexer),
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participle.Unquote("String"),
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participle.UseLookahead(2),
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)
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)
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func Parse(query string) (*Query, error) {
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return rqlParser.ParseString("", query)
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}
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type Operator string
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type Values struct {
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Single *string `parser:"@String"`
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List []string `parser:"| ( '[' @String (',' @String)* ']' )"`
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}
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type Predicate struct {
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Key string `parser:"@Ident '.'"`
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Operator Operator `parser:"@('eq'|'lt'|'lte'|'gt'|'gte'|'like'|'in')"`
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Values Values `parser:"'=' @@"`
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}
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type Query struct {
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Predicates []*Predicate `parser:"@@*"`
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}
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