func NewSession(options *Options) *Session {
if options.GOROOT == "" {
options.GOROOT = build.Default.GOROOT
}
if options.GOPATH == "" {
options.GOPATH = build.Default.GOPATH
}
options.Verbose = options.Verbose || options.Watch
s := &Session{
options: options,
Packages: make(map[string]*PackageData),
}
s.ImportContext = compiler.NewImportContext(s.ImportPackage)
if options.Watch {
if out, err := exec.Command("ulimit", "-n").Output(); err == nil {
if n, err := strconv.Atoi(strings.TrimSpace(string(out))); err == nil && n < 1024 {
fmt.Printf("Warning: The maximum number of open file descriptors is very low (%d). Change it with 'ulimit -n 8192'.\n", n)
}
}
var err error
s.Watcher, err = fsnotify.NewWatcher()
if err != nil {
panic(err)
}
}
return s
}
func NewSession(options *Options) *Session {
if options.GOROOT == "" {
options.GOROOT = build.Default.GOROOT
}
if options.GOPATH == "" {
options.GOPATH = build.Default.GOPATH
}
options.Verbose = options.Verbose || options.Watch
s := &Session{
options: options,
Packages: make(map[string]*PackageData),
}
s.ImportContext = compiler.NewImportContext(s.ImportPackage)
if options.Watch {
var err error
s.Watcher, err = fsnotify.NewWatcher()
if err != nil {
panic(err)
}
}
return s
}
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))
})
}()
}
})
})
}
func control(scope *angularjs.Scope) {
scope.Set("code", initCode)
// scope.Set("showGenerated", false)
// scope.Set("generated", `(generated code will be shown here after clicking "Run")`)
packages := make(map[string]*compiler.Archive)
var pkgsToLoad []string
importContext := compiler.NewImportContext(
func(path string) (*compiler.Archive, error) {
if pkg, found := packages[path]; found {
return pkg, nil
}
pkgsToLoad = append(pkgsToLoad, path)
return &compiler.Archive{}, nil
},
)
fileSet := token.NewFileSet()
pkgsReceived := 0
setupEnvironment(scope)
var run func(bool)
run = func(loadOnly bool) {
output = nil
scope.Set("output", output)
pkgsToLoad = nil
file, err := parser.ParseFile(fileSet, "prog.go",
getCode(), parser.ParseComments,
)
if err != nil {
if list, ok := err.(scanner.ErrorList); ok {
for _, entry := range list {
output = append(output, errErrLine(entry))
}
scope.Set("output", output)
return
}
scope.Set("output", []Line{errErrLine(err)})
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 {
output := make([]Line, 0)
for _, entry := range list {
output = append(output, errErrLine(entry))
}
scope.Set("output", output)
return
}
scope.Set("output", []Line{errErrLine(err)})
return
}
var allPkgs []*compiler.Archive
if len(pkgsToLoad) == 0 {
for _, depPath := range mainPkg.Dependencies {
dep, _ := importContext.Import(string(depPath))
allPkgs = append(allPkgs, dep)
}
allPkgs = append(allPkgs, mainPkg)
}
if len(pkgsToLoad) != 0 {
pkgsReceived = 0
for _, p := range pkgsToLoad {
path := p
req := js.Global.Get("XMLHttpRequest").New()
req.Call("open", "GET", "pkg/"+path+".a", true)
req.Set("responseType", "arraybuffer")
req.Set("onload", func() {
if req.Get("status").Int() != 200 {
f := func() {
emsg := fmt.Sprintf("cannot load package \"%s\"", path)
scope.Set("output", []Line{errLine(emsg)})
}
scope.Apply(f)
return
}
data := js.Global.Get("Uint8Array").New(req.Get("response")).Interface().([]byte)
packages[path], err = compiler.UnmarshalArchive(
path+".a", path, []byte(data), importContext,
)
if err != nil {
scope.Apply(func() {
scope.Set("output", []Line{errErrLine(err)})
})
return
}
pkgsReceived++
if pkgsReceived == len(pkgsToLoad) {
run(loadOnly)
}
})
req.Call("send")
}
return
}
if loadOnly {
return
}
mainPkgCode := bytes.NewBuffer(nil)
compiler.WritePkgCode(packages["main"], false,
&compiler.SourceMapFilter{Writer: mainPkgCode},
)
// scope.Set("generated", mainPkgCode.String())
jsCode := bytes.NewBuffer(nil)
jsCode.WriteString("try{\n")
compiler.WriteProgramCode(allPkgs, importContext,
&compiler.SourceMapFilter{Writer: jsCode},
)
jsCode.WriteString("} catch (err) {\ngoPanicHandler(err.message);\n}\n")
js.Global.Call("eval", js.InternalObject(jsCode.String()))
}
scope.Set("run", run)
run(true)
scope.Set("format", func() {
out, err := format.Source(getCode())
if err != nil {
scope.Set("output", []Line{errErrLine(err)})
return
}
setCode(string(out))
scope.Set("output", []Line{})
})
}