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// Copyright 2020 NLP Odyssey Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package types
import (
"fmt"
"strings"
)
// ListAppender is implemented by any value that exhibits a list-like
// behaviour, allowing arbitrary values to be appended.
type ListAppender interface {
Append(v interface{})
}
// List represents a Python "list" (builtin type).
type List []interface{}
var _ ListAppender = &List{}
// NewList makes and returns a new empty List.
func NewList() *List {
l := make(List, 0, 4)
return &l
}
// NewListFromSlice makes and returns a new List initialized with the elements
// of the given slice.
//
// The new List is a simple type cast of the input slice; the slice is _not_
// copied.
func NewListFromSlice(slice []interface{}) *List {
l := List(slice)
return &l
}
// Append appends one element to the end of the List.
func (l *List) Append(v interface{}) {
*l = append(*l, v)
}
// Get returns the element of the List at the given index.
//
// It panics if the index is out of range.
func (l *List) Get(i int) interface{} {
return (*l)[i]
}
// Len returns the length of the List.
func (l *List) Len() int {
return len(*l)
}
func (*List) Call(args ...interface{}) (interface{}, error) {
if len(args) == 0 {
return NewList(), nil
}
if len(args) == 1 {
return args[0], nil
}
return nil, fmt.Errorf("List: invalid arguments: %#v", args)
}
func (l *List) String() string {
if l == nil {
return "nil"
}
o := new(strings.Builder)
o.WriteString("[")
for i, v := range *l {
if i > 0 {
o.WriteString(", ")
}
fmt.Fprintf(o, "%v", v)
}
o.WriteString("]")
return o.String()
}
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