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money.go
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money.go
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package money
import (
"errors"
"fmt"
)
type Money struct {
amountCents int64
currency Currency
}
const (
ErrInvalidAmountStr = "invalid amount string"
ErrTypeConversion = "type conversion error"
ErrInvalidCurrency = "invalid currency"
)
type Currency string
const (
USD Currency = "USD"
EUR Currency = "EUR"
CNY Currency = "CNY"
)
// NewFromString
// @Description: NewFromString creates a new Money instance from a string.
// @Param amount
// @Param currency
func NewFromString(amount string, currency ...Currency) (*Money, error) {
// validate input
if !IsValidStrAmount(amount) {
return nil, errors.New(ErrInvalidAmountStr)
}
// get instance
m := acquireMoney()
// currency
if len(currency) > 0 {
if !isValidCurrency(string(currency[0])) {
return nil, errors.New(ErrInvalidCurrency)
}
m.currency = currency[0]
} else {
m.currency = USD
}
var err error
m.amountCents, err = parseStrToCentsInt(amount)
if err != nil {
return nil, err
}
// return
return m, nil
}
// MustFromString
// @Description: MustFromString is a helper function that wraps NewFromString and panics if an error is returned.
// @Param amount
// @Param currency
func MustFromString(amount string, currency ...Currency) *Money {
m, err := NewFromString(amount, currency...)
if err != nil {
panic(err)
}
return m
}
// AddStr
// @Description: AddStr adds a string amount to the Money instance.
// @Param str
func (m *Money) AddStr(str string) *Money {
// validate input
if !IsValidStrAmount(str) {
panic(ErrInvalidAmountStr)
}
// parse
amount, err := parseStrToCentsInt(str)
if err != nil {
panic(err)
}
// add
m.amountCents += amount
// return
return m
}
// Add
// @Description: Add adds a Money instance to the Money instance.
// @Param money
func (m *Money) Add(money *Money) *Money {
// add
m.amountCents += money.amountCents
// return
return m
}
// AddCentsInt
// @Description: AddCentsInt adds a cents int to the Money instance.
// @Param c
func (m *Money) AddCentsInt(c int) *Money {
// add
m.amountCents += int64(c)
// return
return m
}
// AddDollarInt
// @Description: AddDollarInt adds a dollar int to the Money instance.
// @Param d
func (m *Money) AddDollarInt(d int) *Money {
// add
m.amountCents += int64(d * 100)
// return
return m
}
// SubStr
// @Description: SubStr subtracts a string amount from the Money instance.
// @Param str
func (m *Money) SubStr(str string) *Money {
// validate input
if !IsValidStrAmount(str) {
panic(ErrInvalidAmountStr)
}
// parse
amount, err := parseStrToCentsInt(str)
if err != nil {
panic(err)
}
// sub
m.amountCents -= amount
// return
return m
}
// Sub
// @Description: Sub subtracts a Money instance from the Money instance.
// @Param money
func (m *Money) Sub(money *Money) *Money {
// sub
m.amountCents -= money.amountCents
// return
return m
}
// SubCentsInt
// @Description: SubCentsInt subtracts a cents int from the Money instance.
// @Param c
func (m *Money) SubCentsInt(c int) *Money {
// sub
m.amountCents -= int64(c)
// return
return m
}
// SubDollarInt
// @Description: SubDollarInt subtracts a dollar int from the Money instance.
// @Param d
func (m *Money) SubDollarInt(d int) *Money {
// sub
m.amountCents -= int64(d * 100)
// return
return m
}
// Mul
// @Description: Mul multiplies the total amount by a number.
// @Param n
func (m *Money) Mul(n int) *Money {
m.amountCents *= int64(n)
return m
}
// Div
// @Description: Div divides the total amount by a number.
// @Param n
func (m *Money) Div(n int) *Money {
m.amountCents /= int64(n)
return m
}
func (m *Money) ToString() string {
defer releaseMoney(m)
return fmt.Sprintf("%.2f", float64(m.amountCents)/100)
}
func (m *Money) ToStringCurrency() string {
defer releaseMoney(m)
return fmt.Sprintf("%s %.2f", m.currency, float64(m.amountCents)/100)
}
func (m *Money) ToCentsInt() int64 {
defer releaseMoney(m)
result := m.amountCents
return result
}