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binding.go
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binding.go
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package binding
import (
"bufio"
"bytes"
"fmt"
"os"
"path/filepath"
"reflect"
"runtime"
"sort"
"strings"
"github.com/wailsapp/wails/v2/internal/typescriptify"
"github.com/leaanthony/slicer"
"github.com/wailsapp/wails/v2/internal/logger"
)
type Bindings struct {
db *DB
logger logger.CustomLogger
exemptions slicer.StringSlicer
structsToGenerateTS map[string]map[string]interface{}
enumsToGenerateTS map[string]map[string]interface{}
tsPrefix string
tsSuffix string
tsInterface bool
obfuscate bool
}
// NewBindings returns a new Bindings object
func NewBindings(logger *logger.Logger, structPointersToBind []interface{}, exemptions []interface{}, obfuscate bool, enumsToBind []interface{}) *Bindings {
result := &Bindings{
db: newDB(),
logger: logger.CustomLogger("Bindings"),
structsToGenerateTS: make(map[string]map[string]interface{}),
enumsToGenerateTS: make(map[string]map[string]interface{}),
obfuscate: obfuscate,
}
for _, exemption := range exemptions {
if exemption == nil {
continue
}
name := runtime.FuncForPC(reflect.ValueOf(exemption).Pointer()).Name()
// Yuk yuk yuk! Is there a better way?
name = strings.TrimSuffix(name, "-fm")
result.exemptions.Add(name)
}
for _, enum := range enumsToBind {
result.AddEnumToGenerateTS(enum)
}
// Add the structs to bind
for _, ptr := range structPointersToBind {
err := result.Add(ptr)
if err != nil {
logger.Fatal("Error during binding: " + err.Error())
}
}
return result
}
// Add the given struct methods to the Bindings
func (b *Bindings) Add(structPtr interface{}) error {
methods, err := b.getMethods(structPtr)
if err != nil {
return fmt.Errorf("cannot bind value to app: %s", err.Error())
}
for _, method := range methods {
splitName := strings.Split(method.Name, ".")
packageName := splitName[0]
structName := splitName[1]
methodName := splitName[2]
// Add it as a regular method
b.db.AddMethod(packageName, structName, methodName, method)
}
return nil
}
func (b *Bindings) DB() *DB {
return b.db
}
func (b *Bindings) ToJSON() (string, error) {
return b.db.ToJSON()
}
func (b *Bindings) GenerateModels() ([]byte, error) {
models := map[string]string{}
var seen slicer.StringSlicer
var seenEnumsPackages slicer.StringSlicer
allStructNames := b.getAllStructNames()
allStructNames.Sort()
allEnumNames := b.getAllEnumNames()
allEnumNames.Sort()
for packageName, structsToGenerate := range b.structsToGenerateTS {
thisPackageCode := ""
w := typescriptify.New()
w.WithPrefix(b.tsPrefix)
w.WithSuffix(b.tsSuffix)
w.WithInterface(b.tsInterface)
w.Namespace = packageName
w.WithBackupDir("")
w.KnownStructs = allStructNames
w.KnownEnums = allEnumNames
// sort the structs
var structNames []string
for structName := range structsToGenerate {
structNames = append(structNames, structName)
}
sort.Strings(structNames)
for _, structName := range structNames {
fqstructname := packageName + "." + structName
if seen.Contains(fqstructname) {
continue
}
structInterface := structsToGenerate[structName]
w.Add(structInterface)
}
// if we have enums for this package, add them as well
var enums, enumsExist = b.enumsToGenerateTS[packageName]
if enumsExist {
for enumName, enum := range enums {
fqemumname := packageName + "." + enumName
if seen.Contains(fqemumname) {
continue
}
w.AddEnum(enum)
}
seenEnumsPackages.Add(packageName)
}
str, err := w.Convert(nil)
if err != nil {
return nil, err
}
thisPackageCode += str
seen.AddSlice(w.GetGeneratedStructs())
models[packageName] = thisPackageCode
}
// Add outstanding enums to the models that were not in packages with structs
for packageName, enumsToGenerate := range b.enumsToGenerateTS {
if seenEnumsPackages.Contains(packageName) {
continue
}
thisPackageCode := ""
w := typescriptify.New()
w.WithPrefix(b.tsPrefix)
w.WithSuffix(b.tsSuffix)
w.WithInterface(b.tsInterface)
w.Namespace = packageName
w.WithBackupDir("")
for enumName, enum := range enumsToGenerate {
fqemumname := packageName + "." + enumName
if seen.Contains(fqemumname) {
continue
}
w.AddEnum(enum)
}
str, err := w.Convert(nil)
if err != nil {
return nil, err
}
thisPackageCode += str
models[packageName] = thisPackageCode
}
// Sort the package names first to make the output deterministic
sortedPackageNames := make([]string, 0)
for packageName := range models {
sortedPackageNames = append(sortedPackageNames, packageName)
}
sort.Strings(sortedPackageNames)
var modelsData bytes.Buffer
for _, packageName := range sortedPackageNames {
modelData := models[packageName]
if strings.TrimSpace(modelData) == "" {
continue
}
modelsData.WriteString("export namespace " + packageName + " {\n")
sc := bufio.NewScanner(strings.NewReader(modelData))
for sc.Scan() {
modelsData.WriteString("\t" + sc.Text() + "\n")
}
modelsData.WriteString("\n}\n\n")
}
return modelsData.Bytes(), nil
}
func (b *Bindings) WriteModels(modelsDir string) error {
modelsData, err := b.GenerateModels()
if err != nil {
return err
}
// Don't write if we don't have anything
if len(modelsData) == 0 {
return nil
}
filename := filepath.Join(modelsDir, "models.ts")
err = os.WriteFile(filename, modelsData, 0o755)
if err != nil {
return err
}
return nil
}
func (b *Bindings) AddEnumToGenerateTS(e interface{}) {
enumType := reflect.TypeOf(e)
var packageName string
var enumName string
// enums should be represented as array of all possible values
if hasElements(enumType) {
enum := enumType.Elem()
// simple enum represented by struct with Value/TSName fields
if enum.Kind() == reflect.Struct {
_, tsNamePresented := enum.FieldByName("TSName")
enumT, valuePresented := enum.FieldByName("Value")
if tsNamePresented && valuePresented {
packageName = getPackageName(enumT.Type.String())
enumName = enumT.Type.Name()
} else {
return
}
// otherwise expecting implementation with TSName() https://github.com/tkrajina/typescriptify-golang-structs#enums-with-tsname
} else {
packageName = getPackageName(enumType.Elem().String())
enumName = enumType.Elem().Name()
}
if b.enumsToGenerateTS[packageName] == nil {
b.enumsToGenerateTS[packageName] = make(map[string]interface{})
}
if b.enumsToGenerateTS[packageName][enumName] != nil {
return
}
b.enumsToGenerateTS[packageName][enumName] = e
}
}
func (b *Bindings) AddStructToGenerateTS(packageName string, structName string, s interface{}) {
if b.structsToGenerateTS[packageName] == nil {
b.structsToGenerateTS[packageName] = make(map[string]interface{})
}
if b.structsToGenerateTS[packageName][structName] != nil {
return
}
b.structsToGenerateTS[packageName][structName] = s
// Iterate this struct and add any struct field references
structType := reflect.TypeOf(s)
if hasElements(structType) {
structType = structType.Elem()
}
for i := 0; i < structType.NumField(); i++ {
field := structType.Field(i)
if field.Anonymous {
continue
}
kind := field.Type.Kind()
if kind == reflect.Struct {
if !field.IsExported() {
continue
}
fqname := field.Type.String()
sNameSplit := strings.Split(fqname, ".")
if len(sNameSplit) < 2 {
continue
}
sName := sNameSplit[1]
pName := getPackageName(fqname)
a := reflect.New(field.Type)
if b.hasExportedJSONFields(field.Type) {
s := reflect.Indirect(a).Interface()
b.AddStructToGenerateTS(pName, sName, s)
}
} else if hasElements(field.Type) && field.Type.Elem().Kind() == reflect.Struct {
if !field.IsExported() {
continue
}
fqname := field.Type.Elem().String()
sNameSplit := strings.Split(fqname, ".")
if len(sNameSplit) < 2 {
continue
}
sName := sNameSplit[1]
pName := getPackageName(fqname)
typ := field.Type.Elem()
a := reflect.New(typ)
if b.hasExportedJSONFields(typ) {
s := reflect.Indirect(a).Interface()
b.AddStructToGenerateTS(pName, sName, s)
}
}
}
}
func (b *Bindings) SetTsPrefix(prefix string) *Bindings {
b.tsPrefix = prefix
return b
}
func (b *Bindings) SetTsSuffix(postfix string) *Bindings {
b.tsSuffix = postfix
return b
}
func (b *Bindings) SetOutputType(outputType string) *Bindings {
if outputType == "interfaces" {
b.tsInterface = true
}
return b
}
func (b *Bindings) getAllStructNames() *slicer.StringSlicer {
var result slicer.StringSlicer
for packageName, structsToGenerate := range b.structsToGenerateTS {
for structName := range structsToGenerate {
result.Add(packageName + "." + structName)
}
}
return &result
}
func (b *Bindings) getAllEnumNames() *slicer.StringSlicer {
var result slicer.StringSlicer
for packageName, enumsToGenerate := range b.enumsToGenerateTS {
for enumName := range enumsToGenerate {
result.Add(packageName + "." + enumName)
}
}
return &result
}
func (b *Bindings) hasExportedJSONFields(typeOf reflect.Type) bool {
for i := 0; i < typeOf.NumField(); i++ {
jsonFieldName := ""
f := typeOf.Field(i)
jsonTag := f.Tag.Get("json")
if len(jsonTag) == 0 {
continue
}
jsonTagParts := strings.Split(jsonTag, ",")
if len(jsonTagParts) > 0 {
jsonFieldName = jsonTagParts[0]
}
for _, t := range jsonTagParts {
if t == "-" {
continue
}
}
if jsonFieldName != "" {
return true
}
}
return false
}