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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package schema
import (
"reflect"
"strconv"
)
// List returns a Checker that accepts a slice value with values
// that are processed with the elem checker. If any element of the
// provided slice value fails to be processed, processing will stop
// and return with the obtained error.
//
// The coerced output value has type []interface{}.
func List(elem Checker) Checker {
return listC{elem}
}
type listC struct {
elem Checker
}
func (c listC) Coerce(v interface{}, path []string) (interface{}, error) {
rv := reflect.ValueOf(v)
if rv.Kind() != reflect.Slice {
return nil, error_{"list", v, path}
}
path = append(path, "[", "?", "]")
l := rv.Len()
out := make([]interface{}, 0, l)
for i := 0; i != l; i++ {
path[len(path)-2] = strconv.Itoa(i)
elem, err := c.elem.Coerce(rv.Index(i).Interface(), path)
if err != nil {
return nil, err
}
out = append(out, elem)
}
return out, nil
}
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