mirror of
https://github.com/MontFerret/ferret.git
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98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
package datetime
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import (
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"context"
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"github.com/MontFerret/ferret/pkg/runtime/core"
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"github.com/MontFerret/ferret/pkg/runtime/values"
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"github.com/MontFerret/ferret/pkg/runtime/values/types"
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)
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var (
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emptyDateTime values.DateTime
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emptyInt values.Int
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emptyString values.String
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)
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// DateAdd add amount given in unit to date.
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// @params date (DateTime) - source date.
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// @params amount (Int) - amount of units
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// @params unit (String) - unit.
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// @return (DateTime) - calculated date.
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// The following units are available:
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// * y, year, year
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// * m, month, months
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// * w, week, weeks
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// * d, day, days
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// * h, hour, hours
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// * i, minute, minutes
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// * s, second, seconds
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// * f, millisecond, milliseconds
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func DateAdd(_ context.Context, args ...core.Value) (core.Value, error) {
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date, amount, unit, err := getArgs(args)
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if err != nil {
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return values.None, err
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}
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u, err := UnitFromString(unit.String())
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if err != nil {
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return values.None, err
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}
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tm := AddUnit(date.Time, int(amount), u)
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return values.NewDateTime(tm), nil
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}
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// DateSubtract subtract amount given in unit to date.
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// @params date (DateTime) - source date.
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// @params amount (Int) - amount of units
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// @params unit (String) - unit.
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// @return (DateTime) - calculated date.
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// The following units are available:
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// * y, year, year
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// * m, month, months
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// * w, week, weeks
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// * d, day, days
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// * h, hour, hours
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// * i, minute, minutes
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// * s, second, seconds
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// * f, millisecond, milliseconds
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func DateSubtract(_ context.Context, args ...core.Value) (core.Value, error) {
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date, amount, unit, err := getArgs(args)
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if err != nil {
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return values.None, err
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}
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u, err := UnitFromString(unit.String())
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if err != nil {
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return values.None, err
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}
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tm := AddUnit(date.Time, -1*int(amount), u)
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return values.NewDateTime(tm), nil
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}
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func getArgs(args []core.Value) (values.DateTime, values.Int, values.String, error) {
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err := core.ValidateArgs(args, 3, 3)
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if err != nil {
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return emptyDateTime, emptyInt, emptyString, err
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}
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err = core.ValidateValueTypePairs(
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core.NewPairValueType(args[0], types.DateTime),
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core.NewPairValueType(args[1], types.Int),
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core.NewPairValueType(args[2], types.String),
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)
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if err != nil {
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return emptyDateTime, emptyInt, emptyString, err
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}
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date := args[0].(values.DateTime)
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amount := args[1].(values.Int)
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unit := args[2].(values.String)
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return date, amount, unit, nil
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}
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