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ferret/pkg/stdlib/objects/keys.go

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package objects
import (
"context"
"sort"
"github.com/MontFerret/ferret/pkg/runtime/core"
"github.com/MontFerret/ferret/pkg/runtime/values"
"github.com/MontFerret/ferret/pkg/runtime/values/types"
)
2018-10-14 19:06:27 +02:00
// Keys returns string array of object's keys
// @params obj (Object) - The object whose keys you want to extract
// @params sort (Boolean, optional) - If sort is true, then the returned keys will be sorted.
// @returns (Array of String) - Array that contains object keys.
func Keys(_ context.Context, args ...core.Value) (core.Value, error) {
err := core.ValidateArgs(args, 1, 2)
if err != nil {
return values.None, err
}
err = core.ValidateType(args[0], types.Object)
if err != nil {
return values.None, err
}
obj := args[0].(*values.Object)
needSort := false
if len(args) == 2 {
err = core.ValidateType(args[1], types.Boolean)
if err != nil {
return values.None, err
}
needSort = bool(args[1].(values.Boolean))
}
keys := sort.StringSlice(obj.Keys())
keysArray := values.NewArray(len(keys))
if needSort {
keys.Sort()
}
for _, key := range keys {
keysArray.Push(values.NewString(key))
}
return keysArray, nil
}