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generate.go
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generate.go
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package codegen
import (
"errors"
"fmt"
"io/ioutil"
"path/filepath"
"runtime"
"strings"
"github.com/operandinc/gqlgen/codegen/config"
"github.com/operandinc/gqlgen/codegen/templates"
"github.com/vektah/gqlparser/v2/ast"
)
func GenerateCode(data *Data) error {
if !data.Config.Exec.IsDefined() {
return fmt.Errorf("missing exec config")
}
switch data.Config.Exec.Layout {
case config.ExecLayoutSingleFile:
return generateSingleFile(data)
case config.ExecLayoutFollowSchema:
return generatePerSchema(data)
}
return fmt.Errorf("unrecognized exec layout %s", data.Config.Exec.Layout)
}
func generateSingleFile(data *Data) error {
return templates.Render(templates.Options{
PackageName: data.Config.Exec.Package,
Filename: data.Config.Exec.Filename,
Data: data,
RegionTags: true,
GeneratedHeader: true,
Packages: data.Config.Packages,
})
}
func generatePerSchema(data *Data) error {
err := generateRootFile(data)
if err != nil {
return err
}
builds := map[string]*Data{}
err = addObjects(data, &builds)
if err != nil {
return err
}
err = addInputs(data, &builds)
if err != nil {
return err
}
err = addInterfaces(data, &builds)
if err != nil {
return err
}
err = addReferencedTypes(data, &builds)
if err != nil {
return err
}
for filename, build := range builds {
if filename == "" {
continue
}
dir := data.Config.Exec.DirName
path := filepath.Join(dir, filename)
err = templates.Render(templates.Options{
PackageName: data.Config.Exec.Package,
Filename: path,
Data: build,
RegionTags: true,
GeneratedHeader: true,
Packages: data.Config.Packages,
})
if err != nil {
return err
}
}
return nil
}
func filename(p *ast.Position, config *config.Config) string {
name := "common!"
if p != nil && p.Src != nil {
gqlname := filepath.Base(p.Src.Name)
ext := filepath.Ext(p.Src.Name)
name = strings.TrimSuffix(gqlname, ext)
}
filenameTempl := config.Exec.FilenameTemplate
if filenameTempl == "" {
filenameTempl = "{name}.generated.go"
}
return strings.ReplaceAll(filenameTempl, "{name}", name)
}
func addBuild(filename string, p *ast.Position, data *Data, builds *map[string]*Data) {
buildConfig := *data.Config
if p != nil {
buildConfig.Sources = []*ast.Source{p.Src}
}
(*builds)[filename] = &Data{
Config: &buildConfig,
QueryRoot: data.QueryRoot,
MutationRoot: data.MutationRoot,
SubscriptionRoot: data.SubscriptionRoot,
AllDirectives: data.AllDirectives,
}
}
// Root file contains top-level definitions that should not be duplicated across the generated
// files for each schema file.
func generateRootFile(data *Data) error {
dir := data.Config.Exec.DirName
path := filepath.Join(dir, "root_.generated.go")
_, thisFile, _, _ := runtime.Caller(0)
rootDir := filepath.Dir(thisFile)
templatePath := filepath.Join(rootDir, "root_.gotpl")
templateBytes, err := ioutil.ReadFile(templatePath)
if err != nil {
return err
}
template := string(templateBytes)
return templates.Render(templates.Options{
PackageName: data.Config.Exec.Package,
Template: template,
Filename: path,
Data: data,
RegionTags: false,
GeneratedHeader: true,
Packages: data.Config.Packages,
})
}
func addObjects(data *Data, builds *map[string]*Data) error {
for _, o := range data.Objects {
filename := filename(o.Position, data.Config)
if (*builds)[filename] == nil {
addBuild(filename, o.Position, data, builds)
}
(*builds)[filename].Objects = append((*builds)[filename].Objects, o)
}
return nil
}
func addInputs(data *Data, builds *map[string]*Data) error {
for _, in := range data.Inputs {
filename := filename(in.Position, data.Config)
if (*builds)[filename] == nil {
addBuild(filename, in.Position, data, builds)
}
(*builds)[filename].Inputs = append((*builds)[filename].Inputs, in)
}
return nil
}
func addInterfaces(data *Data, builds *map[string]*Data) error {
for k, inf := range data.Interfaces {
filename := filename(inf.Position, data.Config)
if (*builds)[filename] == nil {
addBuild(filename, inf.Position, data, builds)
}
build := (*builds)[filename]
if build.Interfaces == nil {
build.Interfaces = map[string]*Interface{}
}
if build.Interfaces[k] != nil {
return errors.New("conflicting interface keys")
}
build.Interfaces[k] = inf
}
return nil
}
func addReferencedTypes(data *Data, builds *map[string]*Data) error {
for k, rt := range data.ReferencedTypes {
filename := filename(rt.Definition.Position, data.Config)
if (*builds)[filename] == nil {
addBuild(filename, rt.Definition.Position, data, builds)
}
build := (*builds)[filename]
if build.ReferencedTypes == nil {
build.ReferencedTypes = map[string]*config.TypeReference{}
}
if build.ReferencedTypes[k] != nil {
return errors.New("conflicting referenced type keys")
}
build.ReferencedTypes[k] = rt
}
return nil
}