ferret/pkg/stdlib/collections/length.go

package collections

import (
	"context"
	"github.com/MontFerret/ferret/pkg/runtime/collections"
	"github.com/MontFerret/ferret/pkg/runtime/core"
	"github.com/MontFerret/ferret/pkg/runtime/values"
)

func Length(_ context.Context, inputs ...core.Value) (core.Value, error) {
	err := core.ValidateArgs(inputs, 1, 1)

	if err != nil {
		return values.None, err
	}

	value := inputs[0]
	err = core.ValidateType(
		value,
		core.StringType,
		core.ArrayType,
		core.ObjectType,
		core.HTMLElementType,
		core.HTMLDocumentType,
		core.BinaryType,
	)

	if err != nil {
		return values.None, err
	}

	return value.(collections.Collection).Length(), nil
}