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ferret/pkg/stdlib/arrays/position.go
Tim Voronov 1af8b37a0f
New type system (#232)
* New type system

* Fixed dot notation for HTML elements
2019-02-13 12:31:18 -05:00

50 lines
1.1 KiB
Go

package arrays
import (
"context"
"github.com/MontFerret/ferret/pkg/runtime/core"
"github.com/MontFerret/ferret/pkg/runtime/values"
"github.com/MontFerret/ferret/pkg/runtime/values/types"
)
// Position returns a value indicating whether an element is contained in array. Optionally returns its position.
// @param array (Array) - The source array.
// @param value (Read) - The target value.
// @param returnIndex (Boolean, optional) - Read which indicates whether to return item's position.
func Position(_ context.Context, args ...core.Value) (core.Value, error) {
err := core.ValidateArgs(args, 2, 3)
if err != nil {
return values.None, err
}
err = core.ValidateType(args[0], types.Array)
if err != nil {
return values.None, err
}
arr := args[0].(*values.Array)
el := args[1]
retIdx := false
if len(args) > 2 {
err = core.ValidateType(args[2], types.Boolean)
if err != nil {
return values.None, err
}
retIdx = args[2].Compare(values.True) == 0
}
position := arr.IndexOf(el)
if !retIdx {
return values.NewBoolean(position > -1), nil
}
return position, nil
}