/
generator.go
204 lines (178 loc) · 5.07 KB
/
generator.go
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package internal
import (
"bytes"
"fmt"
"go/ast"
"io"
"log"
"strings"
"golang.org/x/tools/imports"
)
type Generator struct {
buf bytes.Buffer
PackageName string
}
func NewGenerator() *Generator {
return &Generator{}
}
func (g *Generator) Printf(format string, args ...interface{}) {
fmt.Fprintf(&g.buf, format, args...)
}
func (g *Generator) Generate(it *InterfaceType, fs []FuncType) error {
g.PackageName = it.PackageName
g.appendHeader(it)
g.appendStructDefs(it)
g.appendMethod(fs)
return nil
}
func (g *Generator) GenerateMock(it *InterfaceType, targets []InterfaceType) error {
if g.PackageName == "" {
g.PackageName = it.PackageName
}
g.appendHeader(it)
g.appendImports(targets)
for _, i := range targets {
g.appendMockStruct(&i)
}
return nil
}
func (g *Generator) Out(w io.Writer, filename string) error {
src := g.buf.Bytes()
for i := 0; i < 2; i++ {
dist, err := imports.Process(filename, src, &imports.Options{Comments: true})
if err != nil {
return err
}
src = dist
}
if _, err := io.Copy(w, bytes.NewReader(src)); err != nil {
return err
}
return nil
}
func (g *Generator) appendHeader(it *InterfaceType) {
g.Printf("// Code generated by \"dicon\"; DO NOT EDIT.\n")
g.Printf("\n")
g.Printf("package %s\n", g.PackageName)
g.Printf("\n")
g.Printf("import (\n")
g.Printf("\"log\"\n")
g.Printf("\"github.com/pkg/errors\"\n")
g.Printf(")\n")
}
func (g *Generator) appendImports(targets []InterfaceType) {
g.Printf("import (\n")
defer g.Printf(")\n")
imported := make(map[string]struct{})
for _, target := range targets {
for _, dep := range target.DependPackages {
if _, ok := imported[dep.Path]; !ok {
g.Printf("%s %s\n", dep.Name, dep.Path)
imported[dep.Path] = struct{}{}
}
}
}
}
func (g *Generator) appendStructDefs(it *InterfaceType) {
g.Printf("type dicontainer struct {\n")
g.Printf("store map[string]interface{}\n")
g.Printf("}\n")
g.Printf("func NewDIContainer() %s {\n", it.Name)
g.Printf("return &dicontainer{\n")
g.Printf("store: map[string]interface{}{},\n")
g.Printf("}\n")
g.Printf("}\n")
g.Printf("\n")
}
func (g *Generator) appendMethod(funcs []FuncType) {
for _, f := range funcs {
g.Printf("func (d *dicontainer) %s()", f.Name)
if len(f.ReturnTypes) != 2 {
log.Fatalf("Must be (instance, error) signature but %v", f.ReturnTypes)
}
returnType := f.ReturnTypes[0]
g.Printf("(%s, error) {\n", returnType.ConvertName(g.PackageName))
g.Printf("if i, ok := d.store[\"%s\"]; ok {\n", f.Name)
g.Printf("instance, ok := i.(%s)\n", returnType.ConvertName(g.PackageName))
g.Printf("if !ok {\n")
g.Printf("return nil, fmt.Errorf(\"invalid instance is cached %%v\", instance)\n")
g.Printf("}\n")
g.Printf("return instance, nil\n")
g.Printf("}\n")
dep := make([]string, 0, len(f.ArgumentTypes))
for i, a := range f.ArgumentTypes {
g.Printf("dep%d, err := d.%s()\n", i, a.SimpleName())
g.Printf("if err != nil {\n")
g.Printf("return nil, errors.Wrap(err, \"resolve %s failed at DICON\")\n", a.SimpleName())
g.Printf("}\n")
dep = append(dep, fmt.Sprintf("dep%d", i))
}
g.Printf("instance, err := %sNew%s(%s)\n", g.relativePackageName(f.PackageName), f.Name, strings.Join(dep, ", "))
g.Printf("if err != nil {\n")
g.Printf("return nil, errors.Wrap(err, \"creation %s failed at DICON\")\n", f.Name)
g.Printf("}\n")
g.Printf("d.store[\"%s\"] = instance\n", f.Name)
g.Printf("return instance, nil\n")
g.Printf("}\n")
}
}
func (g *Generator) appendMockStruct(it *InterfaceType) {
g.Printf("type %sMock struct {\n", it.Name)
args := map[string][]string{}
returns := map[string][]string{}
for _, f := range it.Funcs {
var ags []string
for i, a := range f.ArgumentTypes {
ags = append(ags, fmt.Sprintf("a%d %s", i, a.ConvertName(g.PackageName)))
}
args[f.Name] = ags
var rets []string
for _, r := range f.ReturnTypes {
rets = append(rets, r.ConvertName(g.PackageName))
}
returns[f.Name] = rets
g.Printf("%sMock func(%s)", f.Name, strings.Join(ags, ","))
if len(rets) == 1 {
g.Printf("%s", strings.Join(rets, ","))
} else if len(rets) != 0 {
g.Printf("(%s)", strings.Join(rets, ","))
}
g.Printf("\n")
}
g.Printf("}\n")
g.Printf("\n")
g.Printf("func New%sMock() *%sMock {\n", it.Name, it.Name)
g.Printf("return &%sMock{}\n", it.Name)
g.Printf("}\n")
g.Printf("\n")
for _, f := range it.Funcs {
ags := args[f.Name]
rets := returns[f.Name]
g.Printf("func (mk *%sMock) %s(%s) ", it.Name, f.Name, strings.Join(ags, ","))
if len(rets) == 1 {
g.Printf("%s", rets[0])
} else if len(rets) != 0 {
g.Printf("(%s)", strings.Join(rets, ","))
}
g.Printf(" {\n")
var a []string
for i, at := range f.ArgumentTypes {
if _, ok := at.src.(*ast.Ellipsis); ok {
a = append(a, fmt.Sprintf("a%d...", i))
} else {
a = append(a, fmt.Sprintf("a%d", i))
}
}
if len(f.ReturnTypes) > 0 {
g.Printf("return ")
}
g.Printf("mk.%sMock(%s)\n", f.Name, strings.Join(a, ","))
g.Printf("}\n")
}
}
func (g *Generator) relativePackageName(packageName string) string {
if g.PackageName == packageName {
return ""
}
return packageName + "."
}