Initial commit (code only without large binaries)

EdgeCommon/pkg/langs/lang.go

@@ -0,0 +1,84 @@
+// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package langs
+
+import (
+	"errors"
+	"fmt"
+	"github.com/TeaOSLab/EdgeCommon/pkg/configutils"
+	"strings"
+)
+
+const varPrefix = "lang."
+
+type LangCode = string
+
+type Lang struct {
+	code string
+
+	messageMap map[MessageCode]string // message code => message text
+}
+
+func NewLang(code string) *Lang {
+	return &Lang{
+		code:       code,
+		messageMap: map[MessageCode]string{},
+	}
+}
+
+func (this *Lang) Set(messageCode MessageCode, messageText string) {
+	this.messageMap[messageCode] = messageText
+}
+
+func (this *Lang) Has(messageCode MessageCode) bool {
+	_, ok := this.messageMap[messageCode]
+	return ok
+}
+
+// Get 读取单条消息
+// get single message with message code
+func (this *Lang) Get(messageCode MessageCode) string {
+	return this.messageMap[messageCode]
+}
+
+// GetAll 读取所有消息
+// get all messages
+func (this *Lang) GetAll() map[MessageCode]string {
+	return this.messageMap
+}
+
+// Compile variable to literal strings
+func (this *Lang) Compile() error {
+	for code, oldMessage := range this.messageMap {
+		message, err := this.get(code, 0)
+		if err != nil {
+			return fmt.Errorf("compile '%s': '%s' failed: %w", string(code), oldMessage, err)
+		}
+		this.messageMap[code] = message
+	}
+	return nil
+}
+
+func (this *Lang) get(messageCode MessageCode, loopIndex int) (string, error) {
+	if loopIndex >= 8 /** max recurse **/ {
+		return "", errors.New("too many recurse")
+	}
+	loopIndex++
+
+	message, ok := this.messageMap[messageCode]
+	if len(message) == 0 {
+		if !ok && loopIndex > 1 {
+			// recover as variable
+			return "${" + varPrefix + string(messageCode) + "}", errors.New("can not find message for code '" + string(messageCode) + "'")
+		}
+		return "", nil
+	}
+
+	return configutils.ParseVariablesError(message, func(varName string) (value string, err error) {
+		if !strings.HasPrefix(varName, varPrefix) {
+			return "${" + varName + "}", nil
+		}
+
+		return this.get(MessageCode(varName[len(varPrefix):]), loopIndex)
+	})
+}