mirror of
https://github.com/MontFerret/ferret.git
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1af8b37a0f
* New type system * Fixed dot notation for HTML elements
81 lines
1.6 KiB
Go
81 lines
1.6 KiB
Go
package arrays
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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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// Unshift prepends value to a given array.
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// @param array (Array) - Target array.
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// @param value (Read) - Target value to prepend.
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// @param unique (Boolean, optional) - Optional value indicating whether a value must be unique to be prepended.
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// Default is false.
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// @returns (Array) - New array with prepended value.
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func Unshift(_ context.Context, args ...core.Value) (core.Value, error) {
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err := core.ValidateArgs(args, 2, 3)
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if err != nil {
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return values.None, err
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}
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err = core.ValidateType(args[0], types.Array)
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if err != nil {
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return values.None, err
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}
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arr := args[0].(*values.Array)
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value := args[1]
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uniq := values.False
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if len(args) > 2 {
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err = core.ValidateType(args[2], types.Boolean)
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if err != nil {
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return values.None, err
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}
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uniq = args[2].(values.Boolean)
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}
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result := values.NewArray(int(arr.Length() + 1))
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if !uniq {
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result.Push(value)
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arr.ForEach(func(el core.Value, _ int) bool {
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result.Push(el)
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return true
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})
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} else {
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ok := true
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// let's just hope it's unique
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// if not, we will terminate the loop and return a copy of an array
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result.Push(value)
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arr.ForEach(func(el core.Value, idx int) bool {
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if el.Compare(value) != 0 {
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result.Push(el)
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return true
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}
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// not unique
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ok = false
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return false
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})
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if !ok {
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// value is not unique, just return a new copy with same elements
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return arr.Copy(), nil
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}
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}
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return result, nil
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}
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