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// Copyright 2021 CUE Authors
//
// 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 pbinternal
import (
"strings"
"unicode"
"unicode/utf8"
"cuelang.org/go/cue"
)
type CompositeType int
const (
Normal CompositeType = iota
List
Map
)
type ValueType int
const (
Unknown ValueType = iota
Message
Int
Float
String
Bytes
Bool
)
type Info struct {
Name string
CUEName string
Attr cue.Attribute
Value cue.Value
CompositeType CompositeType
ValueType ValueType
Type string
IsEnum bool
// For maps only
KeyType ValueType // only for maps
KeyTypeString string
}
func FromIter(i *cue.Iterator) (info Info, err error) {
return FromValue(i.Selector().Unquoted(), i.Value())
}
func FromValue(name string, v cue.Value) (info Info, err error) {
a := v.Attribute("protobuf")
info.Name = name
info.CUEName = name
if a.Err() == nil {
info.Attr = a
s, ok, err := a.Lookup(1, "name")
if err != nil {
return info, err
}
if ok {
info.Name = strings.TrimSpace(s)
}
info.Type, err = a.String(1)
if err != nil {
return info, err
}
}
switch v.IncompleteKind() {
case cue.ListKind:
info.CompositeType = List
e, _ := v.Elem()
if e.Exists() {
v = e
} else {
for i, _ := v.List(); i.Next(); {
v = i.Value()
break
}
}
case cue.StructKind:
if strings.HasPrefix(info.Type, "map[") {
a := strings.SplitN(info.Type[len("map["):], "]", 2)
info.KeyTypeString = strings.TrimSpace(a[0])
switch info.KeyTypeString {
case "string":
info.KeyType = String
case "bytes":
info.KeyType = Bytes
case "double", "float":
info.KeyType = Float
case "bool":
info.KeyType = Bool
default:
info.KeyType = Int // Assuming
}
info.CompositeType = Map
v, _ = v.Elem()
}
}
info.Value = v
switch v.IncompleteKind() {
case cue.StructKind:
info.ValueType = Message
case cue.StringKind:
info.ValueType = String
case cue.BytesKind:
info.ValueType = Bytes
case cue.BoolKind:
info.ValueType = Bool
case cue.IntKind:
info.ValueType = Int
r, _ := utf8.DecodeRuneInString(info.Type)
info.IsEnum = unicode.In(r, unicode.Upper)
case cue.FloatKind, cue.NumberKind:
info.ValueType = Float
}
return info, nil
}
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