AcceptLanguage.go

package http

import (
	"strconv"
	"strings"
)

// AcceptedLanguage struct
// Language and q-factor weighting
type AcceptedLanguage struct {
	Lang string
	Q    float64
}

// ParseAcceptLanguage (acceptLanguage)
// Use to parse browser 'Accept-Language' header including accepted language and q-factor weighting
// e. g. 'fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5'
func ParseAcceptLanguage(acceptLanguage string) []AcceptedLanguage {
	var (
		langs             string
		langQ             []string
		acceptedLanguages []AcceptedLanguage
	)

	for _, langs = range strings.Split(acceptLanguage, ",") {
		langQ = strings.Split(strings.Trim(langs, " "), ";")
		if len(langQ) == 1 {
			acceptedLanguages = append(acceptedLanguages, AcceptedLanguage{Lang: strings.ToLower(langQ[0]), Q: 1.0})
		} else {
			var (
				err error
				q   float64
			)

			if q, err = strconv.ParseFloat(strings.Split(langQ[1], "=")[1], 64); err != nil {
				q = 0.0
			}
			acceptedLanguages = append(acceptedLanguages, AcceptedLanguage{Lang: strings.ToLower(langQ[0]), Q: q})
		}
	}

	return acceptedLanguages
}