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README.md.tpl
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# Qualify!
[![Build Status](https://travis-ci.org/bsm/qualify.png?branch=master)](https://travis-ci.org/bsm/qualify)
[![GoDoc](https://godoc.org/github.com/bsm/qualify?status.png)](http://godoc.org/github.com/bsm/qualify)
[![Go Report Card](https://goreportcard.com/badge/github.com/bsm/qualify)](https://goreportcard.com/report/github.com/bsm/qualify)
[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
Library for fast rules evaluation for Go. Qualify is able to quickly match a fact against large number of pre-defined rules.
### Example:
```go
import (
"fmt"
"github.com/bsm/qualify"
)
// Fact is an example fact
type Fact struct {
Country string
Browser string
OS string
Attrs []int
}
// Enumeration of our fact features
const (
FieldCountry qualify.Field = iota
FieldBrowser
FieldOS
FieldAttrs
)
// factReader is a wrapper around facts to
// make them comply with qualify.Fact
type factReader struct {
Dict qualify.StrDict
Fact
}
func (r *factReader) AppendFieldValues(x []int, f qualify.Field) []int {
switch f {
case FieldCountry:
return r.Dict.Lookup(x, r.Country)
case FieldBrowser:
return r.Dict.Lookup(x, r.Browser)
case FieldOS:
return r.Dict.Lookup(x, r.OS)
case FieldAttrs:
return append(x, r.Attrs...)
}
return x
}
func main() {{ "ExampleQualifier" | code }}
```