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main.go
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main.go
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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"go/ast"
"go/doc"
"go/format"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"unicode"
)
var (
flagDefaultContext bool
flagRenameNewTypeFunc bool
flagSkipErrorImplementStruct bool
flagCustomContext string
flagExportPath string
)
const help = `Export go packages to qlang modules.
Usage:
qexport [-contexts=""] [-defctx=false] [-convnew=true] [-skiperrimpl=true] [-outpath="./qlang"] packages
The packages for go package list or std for golang all standard packages.
`
func usage() {
fmt.Fprintln(os.Stderr, help)
flag.PrintDefaults()
}
func init() {
flag.StringVar(&flagCustomContext, "contexts", "", "optional comma-separated list of <goos>-<goarch>[-cgo] to override default contexts.")
flag.BoolVar(&flagDefaultContext, "defctx", false, "optional use default context for build, default use all contexts.")
flag.BoolVar(&flagRenameNewTypeFunc, "convnew", true, "optional convert NewType func to type func")
flag.BoolVar(&flagSkipErrorImplementStruct, "skiperrimpl", true, "optional skip error interface implement struct.")
flag.StringVar(&flagExportPath, "outpath", "./qlang", "optional set export root path")
}
var (
ac *ApiCheck
)
func main() {
flag.Parse()
args := flag.Args()
if len(args) == 0 {
usage()
return
}
if flagCustomContext != "" {
flagDefaultContext = false
setCustomContexts(flagCustomContext)
}
//load ApiCheck
ac = NewApiCheck()
err := ac.LoadBase("go1", "go1.1", "go1.2", "go1.3", "go1.4")
if err != nil {
log.Println(err)
}
err = ac.LoadApi("go1.5", "go1.6", "go1.7")
if err != nil {
log.Println(err)
}
var outpath string
if filepath.IsAbs(flagExportPath) {
outpath = flagExportPath
} else {
dir, err := os.Getwd()
if err != nil {
log.Fatalln(err)
}
outpath = filepath.Join(dir, flagExportPath)
}
var pkgs []string
if args[0] == "std" {
out, err := exec.Command("go", "list", "-e", args[0]).Output()
if err != nil {
log.Fatal(err)
}
pkgs = strings.Fields(string(out))
} else {
pkgs = args
}
var exportd []string
for _, pkg := range pkgs {
err := export(pkg, outpath, true)
if err != nil {
log.Printf("warning skip pkg %q, error %v.\n", pkg, err)
} else {
exportd = append(exportd, pkg)
}
}
for _, pkg := range exportd {
log.Printf("export pkg %q success.\n", pkg)
}
}
var (
uint64_const_keys = []string{
"crc64.ECMA",
"crc64.ISO",
"math.MaxUint64",
}
)
func isUint64Const(key string) bool {
for _, k := range uint64_const_keys {
if key == k {
return true
}
}
return false
}
func export(pkg string, outpath string, skipOSArch bool) error {
p, err := NewPackage(pkg, flagDefaultContext)
if err != nil {
return err
}
p.Parser()
bp := p.BuildPackage()
if bp == nil {
return errors.New("not find build")
}
pkgName := bp.Name
if bp.Name == "main" {
return errors.New("skip main pkg")
}
if pkg == "unsafe" {
return errors.New("skip unsafe pkg")
}
if p.CommonCount() == 0 {
return errors.New("empty common exports")
}
//skip internal
for _, path := range strings.Split(bp.ImportPath, "/") {
if path == "internal" {
return errors.New("skip internal pkg")
}
}
var buf bytes.Buffer
outf := func(format string, a ...interface{}) (err error) {
_, err = buf.WriteString(fmt.Sprintf(format, a...))
return
}
checkVer := func(key string) (string, bool) {
vers := ac.FincApis(bp.ImportPath + "." + key)
if len(vers) > 0 {
return vers[0], true
}
return "", false
}
// go ver map
verMap := make(map[string][]string)
outfv := func(ver string, k, v string) {
verMap[ver] = append(verMap[ver], fmt.Sprintf("Exports[%q]=%s", k, v))
}
var hasTypeExport bool
verHasTypeExport := make(map[string]bool)
//write exports
outf(`// Exports is the export table of this module.
//
var Exports = map[string]interface{}{
"_name": "%s",
`, pkg)
//const
if keys, _ := p.FilterCommon(Const); len(keys) > 0 {
outf("\n")
for _, v := range keys {
name := v
fn := pkgName + "." + v
if isUint64Const(fn) {
fn = "uint64(" + fn + ")"
}
if vers, ok := checkVer(v); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
}
//vars
if keys, m := p.FilterCommon(Var); len(keys) > 0 {
outf("\n")
skeys, _ := p.FilterCommon(Struct)
for _, v := range keys {
mv := m[v].(*doc.Value)
var isStructVar bool
if typ := p.simpleValueDeclType(mv.Decl); typ != "" {
for _, k := range skeys {
if typ == k {
isStructVar = true
log.Printf("warning convert struct var to ref %s %s (%s)\n", bp.ImportPath, v, typ)
}
}
}
name := v
fn := pkgName + "." + v
if isStructVar {
fn = "&" + fn
}
if vers, ok := checkVer(v); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
}
//funcs
if keys, _ := p.FilterCommon(Func); len(keys) > 0 {
outf("\n")
for _, v := range keys {
name := toLowerCaseStyle(v)
fn := pkgName + "." + v
if vers, ok := checkVer(v); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
}
//interface
if keys, m := p.FilterCommon(Interface); len(keys) > 0 {
outf("\n")
for _, v := range keys {
t, ok := m[v]
if !ok {
continue
}
dt, ok := t.(*doc.Type)
if !ok {
continue
}
// exported funcs
var funcsNew []string
var funcsOther []string
for _, f := range dt.Funcs {
if ast.IsExported(f.Name) {
if strings.HasPrefix(f.Name, "New"+v) {
funcsNew = append(funcsNew, f.Name)
} else {
funcsOther = append(funcsOther, f.Name)
}
}
}
for _, f := range funcsNew {
name := toLowerCaseStyle(f)
if flagRenameNewTypeFunc && len(funcsNew) == 1 {
name = toLowerCaseStyle(v)
if ast.IsExported(name) {
name = strings.ToLower(name)
log.Printf("waring convert %s to %s", bp.ImportPath+"."+f, name)
}
}
fn := pkgName + "." + f
if vers, ok := checkVer(f); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
for _, f := range funcsOther {
name := toLowerCaseStyle(f)
fn := pkgName + "." + f
if vers, ok := checkVer(f); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
}
}
//structs
if keys, m := p.FilterCommon(Struct); len(keys) > 0 {
outf("\n")
for _, v := range keys {
t, ok := m[v]
if !ok {
continue
}
dt, ok := t.(*doc.Type)
if !ok {
continue
}
// exported funcs
var funcsNew []string
var funcsOther []string
for _, f := range dt.Funcs {
if ast.IsExported(f.Name) {
if strings.HasPrefix(f.Name, "New"+v) {
funcsNew = append(funcsNew, f.Name)
} else {
funcsOther = append(funcsOther, f.Name)
}
}
}
// check error interface implement struct
if flagSkipErrorImplementStruct && strings.HasSuffix(v, "Error") {
check := func(name string) bool {
for _, f := range dt.Methods {
if f.Name == name {
return true
}
}
return false
}
if check("Error") {
log.Printf("warning skip struct %s, is error interface{} implement\n", bp.ImportPath+"."+v)
continue
}
}
//export type, qlang.NewType(reflect.TypeOf((*http.Client)(nil)).Elem())
//export type, qlang.StructOf((*strings.Reader)(nil))
if ast.IsExported(v) {
name := v
fn := fmt.Sprintf("qlang.StructOf((*%s.%s)(nil))", pkgName, v)
if vers, ok := checkVer(v); ok {
verHasTypeExport[vers] = true
outfv(vers, name, fn)
} else {
hasTypeExport = true
outf("\t%q:\t%s,\n", name, fn)
}
}
for _, f := range funcsNew {
name := toLowerCaseStyle(f)
if flagRenameNewTypeFunc && len(funcsNew) == 1 {
name = toLowerCaseStyle(v)
//NewRGBA => rgba
if ast.IsExported(name) {
name = strings.ToLower(name)
log.Printf("waring convert %s to %s", bp.ImportPath+"."+f, name)
}
}
fn := pkgName + "." + f
if vers, ok := checkVer(f); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
for _, f := range funcsOther {
name := toLowerCaseStyle(f)
fn := pkgName + "." + f
if vers, ok := checkVer(f); ok {
outfv(vers, name, fn)
} else {
outf("\t%q:\t%s,\n", name, fn)
}
}
}
}
// end exports
outf("}")
var head bytes.Buffer
outHeadf := func(format string, a ...interface{}) (err error) {
_, err = head.WriteString(fmt.Sprintf(format, a...))
return
}
//write package
outHeadf("package %s\n", pkgName)
if strings.Count(buf.String(), ",") > 1 {
//write imports
outHeadf("import (\n")
outHeadf("\t%q\n", pkg)
if hasTypeExport {
outHeadf("\n\t\"qlang.io/qlang.spec.v1\"\n")
}
outHeadf(")\n\n")
}
// format
data, err := format.Source(append(head.Bytes(), buf.Bytes()...))
if err != nil {
return err
}
// write file
root := filepath.Join(outpath, pkg)
err = os.MkdirAll(root, 0777)
if err != nil {
return err
}
file, err := os.Create(filepath.Join(root, pkgName+".go"))
if err != nil {
return err
}
defer file.Close()
file.Write(data)
// write version
for ver, lines := range verMap {
var buf bytes.Buffer
buf.WriteString(fmt.Sprintf("// +build %s\n\n", ver))
buf.WriteString(fmt.Sprintf("package %s\n\n", pkgName))
if verHasTypeExport[ver] {
buf.WriteString("import (\n")
buf.WriteString(fmt.Sprintf("\t%q\n\n", bp.ImportPath))
buf.WriteString(fmt.Sprintf("\t%q\n", "qlang.io/qlang.spec.v1"))
buf.WriteString(")\n")
} else {
buf.WriteString(fmt.Sprintf("import %q\n", bp.ImportPath))
}
buf.WriteString("func init() {\n\t")
buf.WriteString(strings.Join(lines, "\n\t"))
buf.WriteString("\n}")
data, err := format.Source(buf.Bytes())
if err != nil {
return err
}
file, err := os.Create(filepath.Join(root, pkgName+"-"+strings.Replace(ver, ".", "", 1)+".go"))
if err != nil {
return err
}
file.Write(data)
file.Close()
}
return nil
}
// convert to lower case style, Name => name, NAME => NAME
func toLowerCaseStyle(s string) string {
if len(s) <= 1 {
return s
}
if unicode.IsLower(rune(s[1])) {
return strings.ToLower(s[0:1]) + s[1:]
}
return s
}