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43 lines
800 B
43 lines
800 B
package common
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import (
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"encoding/hex"
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"fmt"
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"strings"
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)
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// Like fmt.Sprintf, but skips formatting if args are empty.
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var Fmt = func(format string, a ...interface{}) string {
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if len(a) == 0 {
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return format
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} else {
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return fmt.Sprintf(format, a...)
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}
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}
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// IsHex returns true for non-empty hex-string prefixed with "0x"
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func IsHex(s string) bool {
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if len(s) > 2 && strings.EqualFold(s[:2], "0x") {
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_, err := hex.DecodeString(s[2:])
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return err == nil
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}
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return false
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}
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// StripHex returns hex string without leading "0x"
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func StripHex(s string) string {
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if IsHex(s) {
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return s[2:]
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}
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return s
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}
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// StringInSlice returns true if a is found the list.
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func StringInSlice(a string, list []string) bool {
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for _, b := range list {
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if b == a {
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return true
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}
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}
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return false
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}
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