45 lines
919 B
Go
45 lines
919 B
Go
package phonenumber
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import (
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"errors"
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"strings"
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)
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// Number takes a number and validates it
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func Number(num string) (string, error) {
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num = strings.Map(func(r rune) rune {
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if r >= '0' && r <= '9' {
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return r
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}
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return -1
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}, num)
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// A number can be 11 digits long, if it starts with a 1
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// but ignore that one.
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if len(num) == 11 && num[0] == '1' {
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num = num[1:]
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}
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if len(num) != 10 {
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return "", errors.New("Invalid Number")
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}
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return num, nil
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}
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// AreaCode takes a number, validates it, and returns the area code
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func AreaCode(num string) (string, error) {
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num, err := Number(num)
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if err != nil {
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return "", err
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}
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return num[:3], nil
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}
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// Format takes a number, validates it and returns it in the format
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// (nnn) nnn-nnnn
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func Format(num string) (string, error) {
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num, err := Number(num)
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if err != nil {
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return "", err
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}
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return "(" + num[:3] + ") " + num[3:6] + "-" + num[6:], nil
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}
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