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109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
package timeconv
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import (
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"fmt"
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"math"
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"regexp"
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"strconv"
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"strings"
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)
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// MillisPerSecond is the number of millseconds per second.
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const MillisPerSecond int64 = 1000
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// MillisPerMinute is the number of millseconds per minute.
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const MillisPerMinute int64 = MillisPerSecond * 60
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// MillisPerHour is the number of millseconds per hour.
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const MillisPerHour int64 = MillisPerMinute * 60
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// MillisPerDay is the number of millseconds per day.
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const MillisPerDay int64 = MillisPerHour * 24
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// MillisPerWeek is the number of millseconds per week.
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const MillisPerWeek int64 = MillisPerDay * 7
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// MillisPerYear is the approximate number of millseconds per year.
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const MillisPerYear int64 = MillisPerDay*365 + int64((float64(MillisPerDay) * 0.25))
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// ParseMilliseconds parses a string containing a number plus
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// a unit of measure for time and returns the number of milliseconds
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// it represents.
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//
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// Example:
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// * "1 second" returns 1000
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// * "1 minute" returns 60000
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// * "1 hour" returns 3600000
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//
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// See config.UnitsToMillis for a list of supported units of measure.
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func ParseMilliseconds(str string) (int64, error) {
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s := strings.TrimSpace(str)
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reg := regexp.MustCompile("([0-9\\.\\-+]*)(.*)")
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matches := reg.FindStringSubmatch(s)
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if matches == nil || len(matches) < 1 || matches[1] == "" {
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return 0, fmt.Errorf("invalid syntax - '%s'", s)
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}
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digits := matches[1]
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units := "ms"
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if len(matches) > 1 && matches[2] != "" {
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units = matches[2]
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}
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fDigits, err := strconv.ParseFloat(digits, 64)
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if err != nil {
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return 0, err
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}
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msPerUnit, err := UnitsToMillis(units)
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if err != nil {
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return 0, err
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}
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// Check for overflow.
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fms := float64(msPerUnit) * fDigits
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if fms > math.MaxInt64 || fms < math.MinInt64 {
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return 0, fmt.Errorf("out of range - '%s' overflows", s)
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}
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ms := int64(fms)
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return ms, nil
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}
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// UnitsToMillis returns the number of milliseconds represented by the specified unit of measure.
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//
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// Example:
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// * "second" returns 1000 <br/>
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// * "minute" returns 60000 <br/>
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// * "hour" returns 3600000 <br/>
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//
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// Supported units of measure:
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// * "milliseconds", "millis", "ms", "millisecond"
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// * "seconds", "sec", "s", "second"
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// * "minutes", "mins", "min", "m", "minute"
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// * "hours", "h", "hour"
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// * "days", "d", "day"
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// * "weeks", "w", "week"
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// * "years", "y", "year"
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func UnitsToMillis(units string) (ms int64, err error) {
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u := strings.TrimSpace(units)
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u = strings.ToLower(u)
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switch u {
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case "milliseconds", "millisecond", "millis", "ms":
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ms = 1
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case "seconds", "second", "sec", "s":
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ms = MillisPerSecond
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case "minutes", "minute", "mins", "min", "m":
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ms = MillisPerMinute
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case "hours", "hour", "h":
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ms = MillisPerHour
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case "days", "day", "d":
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ms = MillisPerDay
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case "weeks", "week", "w":
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ms = MillisPerWeek
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case "years", "year", "y":
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ms = MillisPerYear
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default:
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err = fmt.Errorf("invalid syntax - '%s' not a supported unit of measure", u)
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}
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return
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}
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