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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package schema
import (
"reflect"
"strconv"
)
// Bool returns a Checker that accepts boolean values only.
func Bool() Checker {
return boolC{}
}
type boolC struct{}
func (c boolC) Coerce(v interface{}, path []string) (interface{}, error) {
if v != nil {
switch reflect.TypeOf(v).Kind() {
case reflect.Bool:
return v, nil
case reflect.String:
val, err := strconv.ParseBool(reflect.ValueOf(v).String())
if err == nil {
return val, nil
}
}
}
return nil, error_{"bool", v, path}
}
// Int returns a Checker that accepts any integer value, and returns
// the same value consistently typed as an int64.
func Int() Checker {
return intC{}
}
type intC struct{}
func (c intC) Coerce(v interface{}, path []string) (interface{}, error) {
if v == nil {
return nil, error_{"int", v, path}
}
switch reflect.TypeOf(v).Kind() {
case reflect.Int:
case reflect.Int8:
case reflect.Int16:
case reflect.Int32:
case reflect.Int64:
case reflect.String:
val, err := strconv.ParseInt(reflect.ValueOf(v).String(), 0, 64)
if err == nil {
return val, nil
} else {
return nil, error_{"int", v, path}
}
default:
return nil, error_{"int", v, path}
}
return reflect.ValueOf(v).Int(), nil
}
// Uint returns a Checker that accepts any integer or unsigned value, and
// returns the same value consistently typed as an uint64. If the integer
// value is negative an error is raised.
func Uint() Checker {
return uintC{}
}
type uintC struct{}
func (c uintC) Coerce(v interface{}, path []string) (interface{}, error) {
if v == nil {
return nil, error_{"uint", v, path}
}
switch reflect.TypeOf(v).Kind() {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return reflect.ValueOf(v).Uint(), nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
val := reflect.ValueOf(v).Int()
if val < 0 {
return nil, error_{"uint", v, path}
}
// All positive int64 values fit into uint64.
return uint64(val), nil
case reflect.String:
val, err := strconv.ParseUint(reflect.ValueOf(v).String(), 0, 64)
if err == nil {
return val, nil
} else {
return nil, error_{"uint", v, path}
}
default:
return nil, error_{"uint", v, path}
}
}
// ForceInt returns a Checker that accepts any integer or float value, and
// returns the same value consistently typed as an int. This is required
// in order to handle the interface{}/float64 type conversion performed by
// the JSON serializer used as part of the API infrastructure.
func ForceInt() Checker {
return forceIntC{}
}
type forceIntC struct{}
func (c forceIntC) Coerce(v interface{}, path []string) (interface{}, error) {
if v != nil {
switch vv := reflect.TypeOf(v); vv.Kind() {
case reflect.String:
vstr := reflect.ValueOf(v).String()
intValue, err := strconv.ParseInt(vstr, 0, 64)
if err == nil {
return int(intValue), nil
}
floatValue, err := strconv.ParseFloat(vstr, 64)
if err == nil {
return int(floatValue), nil
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return int(reflect.ValueOf(v).Int()), nil
case reflect.Float32, reflect.Float64:
return int(reflect.ValueOf(v).Float()), nil
}
}
return nil, error_{"number", v, path}
}
// ForceUint returns a Checker that accepts any integer or float value, and
// returns the same value consistently typed as an uint64. This is required
// in order to handle the interface{}/float64 type conversion performed by
// the JSON serializer used as part of the API infrastructure. If the integer
// value is negative an error is raised.
func ForceUint() Checker {
return forceUintC{}
}
type forceUintC struct{}
func (c forceUintC) Coerce(v interface{}, path []string) (interface{}, error) {
if v != nil {
switch vv := reflect.TypeOf(v); vv.Kind() {
case reflect.String:
vstr := reflect.ValueOf(v).String()
intValue, err := strconv.ParseUint(vstr, 0, 64)
if err == nil {
return intValue, nil
}
floatValue, err := strconv.ParseFloat(vstr, 64)
if err == nil {
if floatValue < 0 {
return nil, error_{"uint", v, path}
}
return uint64(floatValue), nil
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return reflect.ValueOf(v).Uint(), nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
val := reflect.ValueOf(v).Int()
if val < 0 {
return nil, error_{"uint", v, path}
}
// All positive int64 values fit into uint64.
return uint64(val), nil
case reflect.Float32, reflect.Float64:
val := reflect.ValueOf(v).Float()
if val < 0 {
return nil, error_{"uint", v, path}
}
return uint64(val), nil
}
}
return nil, error_{"uint", v, path}
}
// Float returns a Checker that accepts any float value, and returns
// the same value consistently typed as a float64.
func Float() Checker {
return floatC{}
}
type floatC struct{}
func (c floatC) Coerce(v interface{}, path []string) (interface{}, error) {
if v == nil {
return nil, error_{"float", v, path}
}
switch reflect.TypeOf(v).Kind() {
case reflect.Float32, reflect.Float64:
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
default:
return nil, error_{"float", v, path}
}
var floatValue float64
return reflect.ValueOf(v).Convert( reflect.TypeOf(floatValue) ).Float() , nil
}
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