refactor: Change the receiving parameter to pointer type

Author: kuafuRace

boundary_unit_test.go

@@ -8,54 +8,66 @@ import (
 
 // Lunar converts Carbon instance to Lunar instance.
 // 将 Carbon 实例转化为 Lunar 实例
-func (c Carbon) Lunar() (l lunar.Lunar) {
-	if c.Error != nil {
+func (c *Carbon) Lunar() *lunar.Lunar {
+	l := new(lunar.Lunar)
+	if c.IsNil() {
+		return nil
+	}
+	if c.HasError() {
 		l.Error = c.Error
-		return
+		return l
 	}
 	return lunar.FromGregorian(c.StdTime()).ToLunar()
 }
 
 // CreateFromLunar creates a Carbon instance from Lunar date and time.
 // 从 农历日期 创建 Carbon 实例
-func CreateFromLunar(year, month, day, hour, minute, second int, isLeapMonth bool) Carbon {
+func CreateFromLunar(year, month, day, hour, minute, second int, isLeapMonth bool) *Carbon {
+	l := lunar.FromLunar(year, month, day, hour, minute, second, isLeapMonth)
+	if !l.IsValid() {
+		return nil
+	}
 	t := lunar.FromLunar(year, month, day, hour, minute, second, isLeapMonth).ToGregorian().Time
 	return CreateFromStdTime(t)
 }
 
 // Julian converts Carbon instance to Julian instance.
 // 将 Carbon 实例转化为 Julian 实例
-func (c Carbon) Julian() (j julian.Julian) {
-	if c.Error != nil {
-		return
+func (c *Carbon) Julian() *julian.Julian {
+	j := new(julian.Julian)
+	if c.IsInvalid() {
+		return j
 	}
 	return julian.FromGregorian(c.StdTime()).ToJulian()
 }
 
 // CreateFromJulian creates a Carbon instance from Julian Day or Modified Julian Day.
 // 从 儒略日/简化儒略日 创建 Carbon 实例
-func CreateFromJulian(f float64) Carbon {
+func CreateFromJulian(f float64) *Carbon {
+	g := julian.FromJulian(f).ToGregorian()
+	if !g.IsValid() {
+		return nil
+	}
 	t := julian.FromJulian(f).ToGregorian().Time
 	return CreateFromStdTime(t)
 }
 
 // Persian converts Carbon instance to Persian instance.
 // 将 Carbon 实例转化为 Persian 实例
-func (c Carbon) Persian() (p persian.Persian) {
-	if c.Error != nil {
-		return
+func (c *Carbon) Persian() *persian.Persian {
+	p := new(persian.Persian)
+	if c.IsInvalid() {
+		return p
 	}
 	return persian.FromGregorian(c.StdTime()).ToPersian()
 }
 
 // CreateFromPersian creates a Carbon instance from Persian date and time.
 // 从 波斯日期 创建 Carbon 实例
-func CreateFromPersian(year, month, day, hour, minute, second int) (c Carbon) {
+func CreateFromPersian(year, month, day, hour, minute, second int) *Carbon {
 	p := persian.FromPersian(year, month, day, hour, minute, second)
-	if p.Error != nil {
-		c.Error = p.Error
-		return
+	if p == nil || p.Error != nil {
+		return nil
 	}
-	t := p.ToGregorian().Time
-	return CreateFromStdTime(t)
+	return CreateFromStdTime(p.ToGregorian().Time)
 }