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package openapi3gen
import (
"reflect"
"strings"
"unicode"
"unicode/utf8"
)
// theFieldInfo contains information about JSON serialization of a field.
type theFieldInfo struct {
HasJSONTag bool
TypeIsMarshaler bool
TypeIsUnmarshaler bool
JSONOmitEmpty bool
JSONString bool
Index []int
Type reflect.Type
JSONName string
}
func appendFields(fields []theFieldInfo, parentIndex []int, t reflect.Type) []theFieldInfo {
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
if t.Kind() != reflect.Struct {
return fields
}
// For each field
numField := t.NumField()
iteration:
for i := 0; i < numField; i++ {
f := t.Field(i)
index := make([]int, 0, len(parentIndex)+1)
index = append(index, parentIndex...)
index = append(index, i)
// See whether this is an embedded field
if f.Anonymous {
jsonTag := f.Tag.Get("json")
if jsonTag == "-" {
continue
}
if jsonTag == "" {
fields = appendFields(fields, index, f.Type)
continue iteration
}
}
// Ignore certain types
switch f.Type.Kind() {
case reflect.Func, reflect.Chan:
continue iteration
}
// Is it a private (lowercase) field?
firstRune, _ := utf8.DecodeRuneInString(f.Name)
if unicode.IsLower(firstRune) {
continue iteration
}
// Declare a field
field := theFieldInfo{
Index: index,
Type: f.Type,
JSONName: f.Name,
}
// Read "json" tag
jsonTag := f.Tag.Get("json")
// Handle "-"
if jsonTag == "-" {
continue
}
// Parse the tag
if jsonTag != "" {
field.HasJSONTag = true
for i, part := range strings.Split(jsonTag, ",") {
if i == 0 {
if part != "" {
field.JSONName = part
}
} else {
switch part {
case "omitempty":
field.JSONOmitEmpty = true
case "string":
field.JSONString = true
}
}
}
}
_, field.TypeIsMarshaler = field.Type.MethodByName("MarshalJSON")
_, field.TypeIsUnmarshaler = field.Type.MethodByName("UnmarshalJSON")
// Field is done
fields = append(fields, field)
}
return fields
}
type sortableFieldInfos []theFieldInfo
func (list sortableFieldInfos) Len() int {
return len(list)
}
func (list sortableFieldInfos) Less(i, j int) bool {
return list[i].JSONName < list[j].JSONName
}
func (list sortableFieldInfos) Swap(i, j int) {
a, b := list[i], list[j]
list[i], list[j] = b, a
}
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