/
utils_parameters.go
229 lines (181 loc) · 4.07 KB
/
utils_parameters.go
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package transformers
import (
"context"
"go/ast"
"reflect"
"strconv"
"strings"
"sync"
contextx "github.com/go-courier/x/context"
reflectx "github.com/go-courier/x/reflect"
typesx "github.com/go-courier/x/types"
)
type Parameter struct {
In string
Name string
Field typesx.StructField
Type typesx.Type
Tags map[string]Tag
Loc []int
}
func (p *Parameter) FieldValue(structReflectValue reflect.Value) reflect.Value {
structReflectValue = reflectx.Indirect(structReflectValue)
n := len(p.Loc)
fieldValue := structReflectValue
for i := 0; i < n; i++ {
loc := p.Loc[i]
fieldValue = fieldValue.Field(loc)
// last loc should keep ptr value
if i < n-1 {
for fieldValue.Kind() == reflect.Ptr {
// notice the ptr struct ensure only for Ptr Anonymous Field
if fieldValue.IsNil() {
fieldValue.Set(reflectx.New(fieldValue.Type()))
}
fieldValue = fieldValue.Elem()
}
}
}
return fieldValue
}
type Tag string
func (t Tag) Name() string {
s := string(t)
if i := strings.Index(s, ","); i >= 0 {
if i == 0 {
return ""
}
return s[0:i]
}
return s
}
func (t Tag) HasFlag(flag string) bool {
if i := strings.Index(string(t), flag); i > 0 {
return true
}
return false
}
type ParameterValue struct {
Parameter
Value reflect.Value
}
type GroupedParameters = map[string][]Parameter
type contextKeyGroupedParametersSet struct{}
var defaultGroupedParametersSet = &sync.Map{}
func GroupedParametersSetFromContext(ctx context.Context) *sync.Map {
if m, ok := ctx.Value(contextKeyGroupedParametersSet{}).(*sync.Map); ok {
return m
}
return defaultGroupedParametersSet
}
func WithGroupedParametersSet(ctx context.Context, m *sync.Map) context.Context {
return contextx.WithValue(ctx, contextKeyGroupedParametersSet{}, m)
}
func EachParameter(ctx context.Context, tpe typesx.Type, each func(p *Parameter) bool) {
var walk func(tpe typesx.Type, parents ...int)
walk = func(tpe typesx.Type, parents ...int) {
for i := 0; i < tpe.NumField(); i++ {
f := tpe.Field(i)
if !ast.IsExported(f.Name()) {
continue
}
loc := append(parents, i)
tags := ParseTags(string(f.Tag()))
tagIn, hasIn := tags["in"]
displayName := f.Name()
tagName, hasName := tags["name"]
if hasName {
if name := tagName.Name(); name == "-" {
// skip name:"-"
continue
} else {
if name != "" {
displayName = name
}
}
}
if f.Anonymous() && (!hasIn && !hasName) {
fieldType := f.Type()
_, ok := typesx.EncodingTextMarshalerTypeReplacer(fieldType)
if !ok {
for fieldType.Kind() == reflect.Ptr {
fieldType = fieldType.Elem()
}
if fieldType.Kind() == reflect.Struct {
walk(fieldType, loc...)
continue
}
}
}
p := &Parameter{}
p.Field = f
p.Type = f.Type()
p.Tags = tags
p.In = tagIn.Name()
p.Name = displayName
p.Loc = append([]int{}, loc...)
if !each(p) {
break
}
}
}
walk(tpe)
}
func CollectGroupedParameters(ctx context.Context, tpe typesx.Type) GroupedParameters {
if tpe.Kind() != reflect.Struct {
return nil
}
m := GroupedParametersSetFromContext(ctx)
if tp, ok := m.Load(tpe); ok {
return tp.(GroupedParameters)
}
gp := GroupedParameters{}
defer func() {
m.Store(tpe, gp)
}()
EachParameter(ctx, tpe, func(p *Parameter) bool {
gp[p.In] = append(gp[p.In], *p)
return true
})
return gp
}
func ParseTags(tag string) map[string]Tag {
tagFlags := map[string]Tag{}
for tag != "" {
i := 0
for i < len(tag) && tag[i] == ' ' {
i++
}
tag = tag[i:]
if tag == "" {
break
}
i = 0
for i < len(tag) && tag[i] > ' ' && tag[i] != ':' && tag[i] != '"' && tag[i] != 0x7f {
i++
}
if i == 0 || i+1 >= len(tag) || tag[i] != ':' || tag[i+1] != '"' {
break
}
name := string(tag[:i])
tag = tag[i+1:]
i = 1
for i < len(tag) && tag[i] != '"' {
if tag[i] == '\\' {
i++
}
i++
}
if i >= len(tag) {
break
}
qvalue := tag[:i+1]
tag = tag[i+1:]
value, err := strconv.Unquote(qvalue)
if err != nil {
break
}
tagFlags[name] = Tag(value)
}
return tagFlags
}