// BuildJSDir builds the js file and returns the content.
// goPkgPath must be a package path eg. github.com/influx6/haiku-examples/app
func BuildJSDir(jsession *JSSession, dir, importpath, name string, js, jsmap *bytes.Buffer) error {
session, options := jsession.Session, jsession.Option
buildpkg, err := build.NewBuildContext(session.InstallSuffix(), options.BuildTags).ImportDir(dir, 0)
if err != nil {
return err
}
pkg := &build.PackageData{Package: buildpkg}
pkg.ImportPath = importpath
//build the package using the sessios
if err = session.BuildPackage(pkg); err != nil {
return err
}
//build up the source map also
smfilter := &compiler.SourceMapFilter{Writer: js}
smsrc := &sourcemap.Map{File: name + ".js"}
smfilter.MappingCallback = build.NewMappingCallback(smsrc, options.GOROOT, options.GOPATH)
deps, err := compiler.ImportDependencies(pkg.Archive, session.ImportContext.Import)
if err != nil {
return err
}
err = compiler.WriteProgramCode(deps, smfilter)
smsrc.WriteTo(jsmap)
js.WriteString("//# sourceMappingURL=" + name + ".map.js\n")
return nil
}
// Build creates a build and returns the first error happening. All errors are typed.
func (b *builder) Build() error {
if b.target == nil {
return ErrorMissingTarget{}
}
fileSet := token.NewFileSet()
files := []*ast.File{}
for name, reader := range b.files {
if reader == nil {
return ErrorParsing{name, "reader must not be nil"}
}
f, err := parser.ParseFile(fileSet, name, reader, 0)
if err != nil {
return ErrorParsing{name, err.Error()}
}
files = append(files, f)
}
s := build.NewSession(b.options)
archive, err := compiler.Compile(b.pkgName, files, fileSet, s.ImportContext, b.options.Minify)
if err != nil {
return ErrorCompiling(err.Error())
}
deps, err := compiler.ImportDependencies(archive, s.ImportContext.Import)
if err != nil {
return ErrorImportingDependencies(err.Error())
}
return compiler.WriteProgramCode(deps, &compiler.SourceMapFilter{Writer: b.target})
}
func Compile(ctx context.Context, source []byte, mapping bool) ([]byte, error) {
vos := vosctx.FromContext(ctx)
options := &build.Options{
GOROOT: vos.Getenv("GOROOT"),
GOPATH: vos.Getenv("GOPATH"),
CreateMapFile: mapping,
}
s := build.NewSession(options)
packages := make(map[string]*compiler.Archive)
importContext := &compiler.ImportContext{
Packages: s.Types,
Import: s.BuildImportPath,
}
fileSet := token.NewFileSet()
file, err := parser.ParseFile(fileSet, "prog.go", source, parser.ParseComments)
if err != nil {
return nil, kerr.Wrap("NCYFEKGCWX", err)
}
mainPkg, err := compiler.Compile("main", []*ast.File{file}, fileSet, importContext, false)
if err != nil {
return nil, kerr.Wrap("KPHUKOLTBX", err)
}
packages["main"] = mainPkg
bufCode := bytes.NewBuffer(nil)
filter := &compiler.SourceMapFilter{Writer: bufCode}
allPkgs, err := compiler.ImportDependencies(mainPkg, importContext.Import)
if err != nil {
return nil, kerr.Wrap("TIMQHFQTWL", err)
}
if mapping {
bufMap := bytes.NewBuffer(nil)
smap := &sourcemap.Map{File: "script.js"}
filter.MappingCallback = build.NewMappingCallback(smap, options.GOROOT, options.GOPATH, false)
if err := compiler.WriteProgramCode(allPkgs, filter); err != nil {
return nil, kerr.Wrap("YKQEKRKBPL", err)
}
if err := smap.WriteTo(bufMap); err != nil {
return nil, kerr.Wrap("VYQGYAAADG", err)
}
return bufMap.Bytes(), nil
}
if err := compiler.WriteProgramCode(allPkgs, filter); err != nil {
return nil, kerr.Wrap("DPPVHCOTBQ", err)
}
if _, err := bufCode.WriteString("//# sourceMappingURL=script.js.map\n"); err != nil {
return nil, kerr.Wrap("CXXKWQVGUI", err)
}
return bufCode.Bytes(), nil
}
// BuildJS builds the js file and returns the content.
// goPkgPath must be a package path eg. github.com/influx6/haiku-examples/app
func BuildJS(jsession *JSSession, goPkgPath, name string, js, jsmap *bytes.Buffer) error {
session, options := jsession.Session, jsession.Option
//get the build path
buildpkg, err := build.Import(goPkgPath, 0, session.InstallSuffix(), options.BuildTags)
if err != nil {
return err
}
if buildpkg.Name != "main" {
return ErrNotMain
}
//build the package data for building
// pkg := &build.PackageData{Package: buildpkg}
//build the package using the sessios
if err = session.BuildPackage(buildpkg); err != nil {
return err
}
//build up the source map also
smfilter := &compiler.SourceMapFilter{Writer: js}
smsrc := &sourcemap.Map{File: name + ".js"}
smfilter.MappingCallback = build.NewMappingCallback(smsrc, options.GOROOT, options.GOPATH)
deps, err := compiler.ImportDependencies(buildpkg.Archive, session.ImportContext.Import)
if err != nil {
return err
}
err = compiler.WriteProgramCode(deps, smfilter)
smsrc.WriteTo(jsmap)
js.WriteString("//# sourceMappingURL=" + name + ".map.js\n")
return nil
}
func (s *Session) WriteCommandPackage(archive *compiler.Archive, pkgObj string) error {
if err := os.MkdirAll(filepath.Dir(pkgObj), 0777); err != nil {
return err
}
codeFile, err := os.Create(pkgObj)
if err != nil {
return err
}
defer codeFile.Close()
sourceMapFilter := &compiler.SourceMapFilter{Writer: codeFile}
if s.options.CreateMapFile {
m := &sourcemap.Map{File: filepath.Base(pkgObj)}
mapFile, err := os.Create(pkgObj + ".map")
if err != nil {
return err
}
defer func() {
m.WriteTo(mapFile)
mapFile.Close()
fmt.Fprintf(codeFile, "//# sourceMappingURL=%s.map\n", filepath.Base(pkgObj))
}()
sourceMapFilter.MappingCallback = NewMappingCallback(m, s.options.GOROOT, s.options.GOPATH)
}
deps, err := compiler.ImportDependencies(archive, func(path string) (*compiler.Archive, error) {
if archive, ok := s.Archives[path]; ok {
return archive, nil
}
_, archive, err := s.buildImportPathWithSrcDir(path, "")
return archive, err
})
if err != nil {
return err
}
return compiler.WriteProgramCode(deps, sourceMapFilter)
}
func (s *Session) WriteCommandPackage(pkg *PackageData, pkgObj string) error {
if !pkg.IsCommand() || pkg.UpToDate {
return nil
}
if err := os.MkdirAll(filepath.Dir(pkgObj), 0777); err != nil {
return err
}
codeFile, err := os.Create(pkgObj)
if err != nil {
return err
}
defer codeFile.Close()
sourceMapFilter := &compiler.SourceMapFilter{Writer: codeFile}
if s.options.CreateMapFile {
m := &sourcemap.Map{File: filepath.Base(pkgObj)}
mapFile, err := os.Create(pkgObj + ".map")
if err != nil {
return err
}
defer func() {
m.WriteTo(mapFile)
mapFile.Close()
fmt.Fprintf(codeFile, "//# sourceMappingURL=%s.map\n", filepath.Base(pkgObj))
}()
sourceMapFilter.MappingCallback = NewMappingCallback(m, s.options.GOROOT, s.options.GOPATH)
}
deps, err := compiler.ImportDependencies(pkg.Archive, s.BuildImportPath)
if err != nil {
return err
}
return compiler.WriteProgramCode(deps, sourceMapFilter)
}
func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) {
name := path.Join(fs.serveRoot, requestName[1:]) // requestName[0] == '/'
dir, file := path.Split(name)
base := path.Base(dir) // base is parent folder name, which becomes the output file name.
isPkg := file == base+".js"
isMap := file == base+".js.map"
isIndex := file == "index.html"
if isPkg || isMap || isIndex {
// If we're going to be serving our special files, make sure there's a Go command in this folder.
s := gbuild.NewSession(fs.options)
pkg, err := gbuild.Import(path.Dir(name), 0, s.InstallSuffix(), fs.options.BuildTags)
if err != nil || pkg.Name != "main" {
isPkg = false
isMap = false
isIndex = false
}
switch {
case isPkg:
buf := bytes.NewBuffer(nil)
browserErrors := bytes.NewBuffer(nil)
exitCode := handleError(func() error {
archive, err := s.BuildPackage(pkg)
if err != nil {
return err
}
sourceMapFilter := &compiler.SourceMapFilter{Writer: buf}
m := &sourcemap.Map{File: base + ".js"}
sourceMapFilter.MappingCallback = gbuild.NewMappingCallback(m, fs.options.GOROOT, fs.options.GOPATH)
deps, err := compiler.ImportDependencies(archive, s.BuildImportPath)
if err != nil {
return err
}
if err := compiler.WriteProgramCode(deps, sourceMapFilter); err != nil {
return err
}
mapBuf := bytes.NewBuffer(nil)
m.WriteTo(mapBuf)
buf.WriteString("//# sourceMappingURL=" + base + ".js.map\n")
fs.sourceMaps[name+".map"] = mapBuf.Bytes()
return nil
}, fs.options, browserErrors)
if exitCode != 0 {
buf = browserErrors
}
return newFakeFile(base+".js", buf.Bytes()), nil
case isMap:
if content, ok := fs.sourceMaps[name]; ok {
return newFakeFile(base+".js.map", content), nil
}
}
}
for _, d := range fs.dirs {
dir := http.Dir(filepath.Join(d, "src"))
f, err := dir.Open(name)
if err == nil {
return f, nil
}
// source maps are served outside of serveRoot
f, err = dir.Open(requestName)
if err == nil {
return f, nil
}
}
if isIndex {
// If there was no index.html file in any dirs, supply our own.
return newFakeFile("index.html", []byte(`<html><head><meta charset="utf-8"><script src="`+base+`.js"></script></head></html>`)), nil
}
return nil, os.ErrNotExist
}
func (fs serveCommandFileSystem) Open(name string) (http.File, error) {
for _, d := range fs.dirs {
file, err := http.Dir(filepath.Join(d, "src")).Open(name)
if err == nil {
return file, nil
}
}
if strings.HasSuffix(name, "/main.js.map") {
if content, ok := fs.sourceMaps[name]; ok {
return newFakeFile("main.js.map", content), nil
}
}
isIndex := strings.HasSuffix(name, "/index.html")
isMain := strings.HasSuffix(name, "/main.js")
if isIndex || isMain {
s := gbuild.NewSession(fs.options)
buildPkg, err := gbuild.Import(path.Dir(name[1:]), 0, s.InstallSuffix(), fs.options.BuildTags)
if err != nil || buildPkg.Name != "main" {
return nil, os.ErrNotExist
}
if isIndex {
return newFakeFile("index.html", []byte(`<html><head><meta charset="utf-8"><script src="main.js"></script></head></html>`)), nil
}
if isMain {
buf := bytes.NewBuffer(nil)
browserErrors := bytes.NewBuffer(nil)
exitCode := handleError(func() error {
pkg := &gbuild.PackageData{Package: buildPkg}
if err := s.BuildPackage(pkg); err != nil {
return err
}
sourceMapFilter := &compiler.SourceMapFilter{Writer: buf}
m := &sourcemap.Map{File: "main.js"}
sourceMapFilter.MappingCallback = gbuild.NewMappingCallback(m, fs.options.GOROOT, fs.options.GOPATH)
deps, err := compiler.ImportDependencies(pkg.Archive, s.ImportContext.Import)
if err != nil {
return err
}
if err := compiler.WriteProgramCode(deps, sourceMapFilter); err != nil {
return err
}
mapBuf := bytes.NewBuffer(nil)
m.WriteTo(mapBuf)
buf.WriteString("//# sourceMappingURL=main.js.map\n")
fs.sourceMaps[name+".map"] = mapBuf.Bytes()
return nil
}, fs.options, browserErrors)
if exitCode != 0 {
buf = browserErrors
}
return newFakeFile("main.js", buf.Bytes()), nil
}
}
return nil, os.ErrNotExist
}
func main() {
var location = dom.GetWindow().Top().Location() // We might be inside an iframe, but want to use the location of topmost window.
codeReady := make(chan struct{}) // Used to synchronize when "code" value is ready.
app := angularjs.NewModule("playground", nil, nil)
app.NewController("PlaygroundCtrl", func(scope *angularjs.Scope) {
if strings.HasPrefix(location.Hash, "#/") {
id := location.Hash[2:]
req := xhr.NewRequest("GET", "http://"+snippetStoreHost+"/p/"+id)
req.ResponseType = xhr.ArrayBuffer
go func() {
err := req.Send(nil)
if err != nil || req.Status != 200 {
scope.Apply(func() {
scope.Set("output", []Line{Line{"type": "err", "content": `failed to load snippet "` + id + `"`}})
})
return
}
data := js.Global.Get("Uint8Array").New(req.Response).Interface().([]byte)
scope.Apply(func() {
scope.Set("code", string(data))
close(codeReady)
})
}()
} else {
scope.Set("code", "package main\n\nimport (\n\t\"fmt\"\n\t\"github.com/gopherjs/gopherjs/js\"\n)\n\nfunc main() {\n\tfmt.Println(\"Hello, playground\")\n\tjs.Global.Call(\"alert\", \"Hello, JavaScript\")\n\tprintln(\"Hello, JS console\")\n}\n")
close(codeReady)
}
scope.Set("shareUrl", "")
scope.Set("showShareUrl", false)
packages := make(map[string]*compiler.Archive)
var pkgsToLoad map[string]struct{}
importContext := compiler.NewImportContext(func(path string) (*compiler.Archive, error) {
if pkg, found := packages[path]; found {
return pkg, nil
}
pkgsToLoad[path] = struct{}{}
return &compiler.Archive{}, nil
})
fileSet := token.NewFileSet()
pkgsReceived := 0
setupEnvironment(scope)
codeArea := angularjs.ElementById("code")
codeArea.On("input", func(e *angularjs.Event) {
scope.Set("showShareUrl", false)
location.Hash = ""
})
codeArea.On("keydown", func(e *angularjs.Event) {
toInsert := ""
switch e.KeyCode {
case '\t':
toInsert = "\t"
case '\r':
toInsert = "\n"
start := codeArea.Prop("selectionStart").Int()
code := scope.Get("code").String()
i := strings.LastIndex(code[:start], "\n") + 1
for i < start {
c := code[i]
if c != ' ' && c != '\t' {
break
}
toInsert += string(c)
i++
}
}
if toInsert != "" {
scope.Set("showShareUrl", false)
location.Hash = ""
start := codeArea.Prop("selectionStart").Int()
end := codeArea.Prop("selectionEnd").Int()
code := scope.Get("code").String()
scope.Apply(func() {
scope.Set("code", code[:start]+toInsert+code[end:])
})
codeArea.SetProp("selectionStart", start+len(toInsert))
codeArea.SetProp("selectionEnd", start+len(toInsert))
e.PreventDefault()
}
})
var run func(bool)
run = func(loadOnly bool) {
output = nil
scope.Set("output", output)
pkgsToLoad = make(map[string]struct{})
file, err := parser.ParseFile(fileSet, "prog.go", []byte(scope.Get("code").String()), parser.ParseComments)
if err != nil {
if list, ok := err.(scanner.ErrorList); ok {
for _, entry := range list {
output = append(output, Line{"type": "err", "content": entry.Error()})
}
scope.Set("output", output)
return
}
scope.Set("output", []Line{Line{"type": "err", "content": err.Error()}})
return
}
mainPkg, err := compiler.Compile("main", []*ast.File{file}, fileSet, importContext, false)
packages["main"] = mainPkg
if err != nil && len(pkgsToLoad) == 0 {
if list, ok := err.(compiler.ErrorList); ok {
var output []Line
for _, entry := range list {
output = append(output, Line{"type": "err", "content": entry.Error()})
}
scope.Set("output", output)
return
}
scope.Set("output", []Line{Line{"type": "err", "content": err.Error()}})
return
}
var allPkgs []*compiler.Archive
if len(pkgsToLoad) == 0 {
allPkgs, _ = compiler.ImportDependencies(mainPkg, importContext.Import)
}
if len(pkgsToLoad) != 0 {
pkgsReceived = 0
for path := range pkgsToLoad {
req := xhr.NewRequest("GET", "pkg/"+path+".a.js")
req.ResponseType = xhr.ArrayBuffer
go func(path string) {
err := req.Send(nil)
if err != nil || req.Status != 200 {
scope.Apply(func() {
scope.Set("output", []Line{Line{"type": "err", "content": `failed to load package "` + path + `"`}})
})
return
}
data := js.Global.Get("Uint8Array").New(req.Response).Interface().([]byte)
packages[path], err = compiler.ReadArchive(path+".a", path, bytes.NewReader(data), importContext.Packages)
if err != nil {
scope.Apply(func() {
scope.Set("output", []Line{Line{"type": "err", "content": err.Error()}})
})
return
}
pkgsReceived++
if pkgsReceived == len(pkgsToLoad) {
run(loadOnly)
}
}(path)
}
return
}
if loadOnly {
return
}
jsCode := bytes.NewBuffer(nil)
jsCode.WriteString("try{\n")
compiler.WriteProgramCode(allPkgs, &compiler.SourceMapFilter{Writer: jsCode})
jsCode.WriteString("} catch (err) {\ngoPanicHandler(err.message);\n}\n")
js.Global.Set("$checkForDeadlock", true)
js.Global.Call("eval", js.InternalObject(jsCode.String()))
}
scope.Set("run", run)
go func() {
<-codeReady // Wait for "code" value to be ready.
run(true)
}()
scope.Set("format", func() {
out, err := format.Source([]byte(scope.Get("code").String()))
if err != nil {
scope.Set("output", []Line{Line{"type": "err", "content": err.Error()}})
return
}
scope.Set("code", string(out))
scope.Set("output", []Line{})
})
scope.Set("share", func() {
req := xhr.NewRequest("POST", "http://"+snippetStoreHost+"/share")
req.ResponseType = xhr.ArrayBuffer
go func() {
err := req.Send([]byte(scope.Get("code").String())) // Send as binary.
if err != nil || req.Status != 200 {
scope.Apply(func() {
scope.Set("output", []Line{Line{"type": "err", "content": `failed to share snippet`}})
})
return
}
data := js.Global.Get("Uint8Array").New(req.Response).Interface().([]byte)
scope.Apply(func() {
id := string(data)
location.Hash = "#/" + id
scope.Set("shareUrl", location.String())
scope.Set("showShareUrl", true)
// TODO: Do this better using AngularJS.
// Perhaps using http://stackoverflow.com/questions/14833326/how-to-set-focus-on-input-field/18295416.
go func() {
time.Sleep(time.Millisecond)
dom.GetWindow().Document().GetElementByID("share-url").(*dom.HTMLInputElement).Select()
}()
})
}()
})
// Start watching for hashchange events, and reload snippet if it happens.
dom.GetWindow().Top().AddEventListener("hashchange", false, func(event dom.Event) {
event.PreventDefault()
if strings.HasPrefix(location.Hash, "#/") {
id := location.Hash[2:]
req := xhr.NewRequest("GET", "http://"+snippetStoreHost+"/p/"+id)
req.ResponseType = xhr.ArrayBuffer
go func() {
err := req.Send(nil)
if err != nil || req.Status != 200 {
scope.Apply(func() {
scope.Set("output", []Line{Line{"type": "err", "content": `failed to load snippet "` + id + `"`}})
})
return
}
data := js.Global.Get("Uint8Array").New(req.Response).Interface().([]byte)
scope.Apply(func() {
scope.Set("code", string(data))
})
}()
}
})
})
}