packer-cn/vendor/github.com/deepmap/oapi-codegen/pkg/runtime/bindstring.go

144 lines
4.2 KiB
Go

// Copyright 2019 DeepMap, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package runtime
import (
"errors"
"fmt"
"reflect"
"strconv"
"time"
"github.com/deepmap/oapi-codegen/pkg/types"
)
// This function takes a string, and attempts to assign it to the destination
// interface via whatever type conversion is necessary. We have to do this
// via reflection instead of a much simpler type switch so that we can handle
// type aliases. This function was the easy way out, the better way, since we
// know the destination type each place that we use this, is to generate code
// to read each specific type.
func BindStringToObject(src string, dst interface{}) error {
var err error
v := reflect.ValueOf(dst)
t := reflect.TypeOf(dst)
// We need to dereference pointers
if t.Kind() == reflect.Ptr {
v = reflect.Indirect(v)
t = v.Type()
}
// The resulting type must be settable. reflect will catch issues like
// passing the destination by value.
if !v.CanSet() {
return errors.New("destination is not settable")
}
switch t.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
var val int64
val, err = strconv.ParseInt(src, 10, 64)
if err == nil {
v.SetInt(val)
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
var val uint64
val, err = strconv.ParseUint(src, 10, 64)
if err == nil {
v.SetUint(val)
}
case reflect.String:
v.SetString(src)
err = nil
case reflect.Float64, reflect.Float32:
var val float64
val, err = strconv.ParseFloat(src, 64)
if err == nil {
v.SetFloat(val)
}
case reflect.Bool:
var val bool
val, err = strconv.ParseBool(src)
if err == nil {
v.SetBool(val)
}
case reflect.Struct:
// if this is not of type Time or of type Date look to see if this is of type Binder.
if dstType, ok := dst.(Binder); ok {
return dstType.Bind(src)
}
if t.ConvertibleTo(reflect.TypeOf(time.Time{})) {
// Don't fail on empty string.
if src == "" {
return nil
}
// Time is a special case of a struct that we handle
parsedTime, err := time.Parse(time.RFC3339Nano, src)
if err != nil {
parsedTime, err = time.Parse(types.DateFormat, src)
if err != nil {
return fmt.Errorf("error parsing '%s' as RFC3339 or 2006-01-02 time: %s", src, err)
}
}
// So, assigning this gets a little fun. We have a value to the
// dereference destination. We can't do a conversion to
// time.Time because the result isn't assignable, so we need to
// convert pointers.
if t != reflect.TypeOf(time.Time{}) {
vPtr := v.Addr()
vtPtr := vPtr.Convert(reflect.TypeOf(&time.Time{}))
v = reflect.Indirect(vtPtr)
}
v.Set(reflect.ValueOf(parsedTime))
return nil
}
if t.ConvertibleTo(reflect.TypeOf(types.Date{})) {
// Don't fail on empty string.
if src == "" {
return nil
}
parsedTime, err := time.Parse(types.DateFormat, src)
if err != nil {
return fmt.Errorf("error parsing '%s' as date: %s", src, err)
}
parsedDate := types.Date{Time: parsedTime}
// We have to do the same dance here to assign, just like with times
// above.
if t != reflect.TypeOf(types.Date{}) {
vPtr := v.Addr()
vtPtr := vPtr.Convert(reflect.TypeOf(&types.Date{}))
v = reflect.Indirect(vtPtr)
}
v.Set(reflect.ValueOf(parsedDate))
return nil
}
// We fall through to the error case below if we haven't handled the
// destination type above.
fallthrough
default:
// We've got a bunch of types unimplemented, don't fail silently.
err = fmt.Errorf("can not bind to destination of type: %s", t.Kind())
}
if err != nil {
return fmt.Errorf("error binding string parameter: %s", err)
}
return nil
}