64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
package txt
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import (
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"strings"
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)
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// Empty checks whether a string represents an empty, unset, or undefined value.
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func Empty(s string) bool {
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if s == "" {
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return true
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} else if s = strings.Trim(s, "%* "); s == "" || s == "0" || s == "-1" || DateTimeDefault(s) {
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return true
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} else if s = strings.ToLower(s); s == "nil" || s == "null" || s == "none" || s == "nan" {
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return true
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}
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return false
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}
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// NotEmpty tests if a string does not represent an empty/invalid value.
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func NotEmpty(s string) bool {
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return !Empty(s)
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}
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// EmptyDateTime tests if the string is empty or matches an unknown time pattern.
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func EmptyDateTime(s string) bool {
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switch s {
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case "", "-", ":", "z", "Z", "nil", "null", "none", "nan", "NaN":
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return true
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case "0", "00", "0000", "0000:00:00", "00:00:00", "0000-00-00", "00-00-00":
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return true
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case " : : : : ", " - - - - ", " - - : : ":
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// Exif default.
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return true
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case "0000:00:00 00:00:00", "0000-00-00 00-00-00", "0000-00-00 00:00:00":
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return true
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case "0001:01:01 00:00:00", "0001-01-01 00-00-00", "0001-01-01 00:00:00":
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// Go default.
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return true
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case "0001:01:01 00:00:00 +0000 UTC", "0001-01-01 00-00-00 +0000 UTC", "0001-01-01 00:00:00 +0000 UTC":
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// Go default with time zone.
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return true
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default:
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return false
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}
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}
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// DateTimeDefault tests if the datetime string is not empty and not a default value.
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func DateTimeDefault(s string) bool {
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switch s {
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case "1970-01-01", "1970-01-01 00:00:00", "1970:01:01 00:00:00":
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// Unix epoch.
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return true
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case "1980-01-01", "1980-01-01 00:00:00", "1980:01:01 00:00:00":
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// Windows default.
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return true
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case "2002-12-08 12:00:00", "2002:12:08 12:00:00":
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// Android Bug: https://issuetracker.google.com/issues/36967504
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return true
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default:
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return EmptyDateTime(s)
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}
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}
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