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package money |
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import ( |
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"strconv" |
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"strings" |
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) |
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// Currency represents the currency information for formatting |
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type Currency struct { |
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code string |
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decimalDelimiter string |
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thousandDelimiter string |
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exponent int |
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symbol string |
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template string |
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} |
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// https://en.wikipedia.org/wiki/ISO_4217 |
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// USD creates and returns a new Currency instance for USD |
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func USD() *Currency { |
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return &Currency{code: "USD", decimalDelimiter: ".", thousandDelimiter: ",", exponent: 2, symbol: "$", template: "$1"} |
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} |
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// EUR creates and returns a new Currency instance for EUR |
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func EUR() *Currency { |
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return &Currency{code: "EUR", decimalDelimiter: ",", thousandDelimiter: ".", exponent: 2, symbol: "€", template: "$1"} |
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} |
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// Add creates and returns a new Currency instance |
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func Add(code string, decimalDelimiter string, thousandDelimiter string, exponent int, symbol string, template string) *Currency { |
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return &Currency{ |
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code: code, |
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decimalDelimiter: decimalDelimiter, |
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thousandDelimiter: thousandDelimiter, |
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exponent: exponent, |
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symbol: symbol, |
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template: template, |
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} |
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} |
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// Format returns a formatted string for the given amount value |
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func (c *Currency) Format(amount int64) string { |
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positiveAmount := amount |
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if amount < 0 { |
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positiveAmount = amount * -1 |
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} |
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result := strconv.FormatInt(positiveAmount, 10) |
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if len(result) <= c.exponent { |
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result = strings.Repeat("0", c.exponent-len(result)+1) + result |
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} |
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if c.thousandDelimiter != "" { |
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for i := len(result) - c.exponent - 3; i > 0; i -= 3 { |
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result = result[:i] + c.thousandDelimiter + result[i:] |
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} |
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} |
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if c.exponent > 0 { |
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result = result[:len(result)-c.exponent] + c.decimalDelimiter + result[len(result)-c.exponent:] |
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} |
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result = strings.Replace(c.template, "1", result, 1) |
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result = strings.Replace(result, "$", c.symbol, 1) |
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// Add minus sign for negative amount |
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if amount < 0 { |
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result = "-" + result |
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} |
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return result |
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} |
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func (c *Currency) equals(currency *Currency) bool { |
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return c.code == currency.code |
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} |
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mc388 /
go-money
