+++ /dev/null
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
- "bytes"
- "flag"
- "io/ioutil"
- "log"
- "net/http"
- "os"
- "os/exec"
- "path/filepath"
- "regexp"
- "strconv"
- "text/template"
-)
-
-var (
- httpListen = flag.String("http", "127.0.0.1:3999", "host:port to listen on")
- htmlOutput = flag.Bool("html", false, "render program output as HTML")
-)
-
-var (
- // a source of numbers, for naming temporary files
- uniq = make(chan int)
-)
-
-func main() {
- flag.Parse()
-
- // source of unique numbers
- go func() {
- for i := 0; ; i++ {
- uniq <- i
- }
- }()
-
- http.HandleFunc("/", FrontPage)
- http.HandleFunc("/compile", Compile)
- log.Fatal(http.ListenAndServe(*httpListen, nil))
-}
-
-// FrontPage is an HTTP handler that renders the goplay interface.
-// If a filename is supplied in the path component of the URI,
-// its contents will be put in the interface's text area.
-// Otherwise, the default "hello, world" program is displayed.
-func FrontPage(w http.ResponseWriter, req *http.Request) {
- data, err := ioutil.ReadFile(req.URL.Path[1:])
- if err != nil {
- data = helloWorld
- }
- frontPage.Execute(w, data)
-}
-
-// Compile is an HTTP handler that reads Go source code from the request,
-// runs the program (returning any errors),
-// and sends the program's output as the HTTP response.
-func Compile(w http.ResponseWriter, req *http.Request) {
- out, err := compile(req)
- if err != nil {
- error_(w, out, err)
- return
- }
-
- // write the output of x as the http response
- if *htmlOutput {
- w.Write(out)
- } else {
- output.Execute(w, out)
- }
-}
-
-var (
- commentRe = regexp.MustCompile(`(?m)^#.*\n`)
- tmpdir string
-)
-
-func init() {
- // find real temporary directory (for rewriting filename in output)
- var err error
- tmpdir, err = filepath.EvalSymlinks(os.TempDir())
- if err != nil {
- log.Fatal(err)
- }
-}
-
-func compile(req *http.Request) (out []byte, err error) {
- // x is the base name for .go, .6, executable files
- x := filepath.Join(tmpdir, "compile"+strconv.Itoa(<-uniq))
- src := x + ".go"
-
- // rewrite filename in error output
- defer func() {
- if err != nil {
- // drop messages from the go tool like '# _/compile0'
- out = commentRe.ReplaceAll(out, nil)
- }
- out = bytes.Replace(out, []byte(src+":"), []byte("main.go:"), -1)
- }()
-
- // write body to x.go
- body := new(bytes.Buffer)
- if _, err = body.ReadFrom(req.Body); err != nil {
- return
- }
- defer os.Remove(src)
- if err = ioutil.WriteFile(src, body.Bytes(), 0666); err != nil {
- return
- }
-
- // go run x.go
- dir, file := filepath.Split(src)
- out, err = run(dir, "go", "run", file)
- if err != nil {
- return
- }
- return out, nil
-}
-
-// error writes compile, link, or runtime errors to the HTTP connection.
-// The JavaScript interface uses the 404 status code to identify the error.
-func error_(w http.ResponseWriter, out []byte, err error) {
- w.WriteHeader(404)
- if out != nil {
- output.Execute(w, out)
- } else {
- output.Execute(w, err.Error())
- }
-}
-
-// run executes the specified command and returns its output and an error.
-func run(dir string, args ...string) ([]byte, error) {
- var buf bytes.Buffer
- cmd := exec.Command(args[0], args[1:]...)
- cmd.Dir = dir
- cmd.Stdout = &buf
- cmd.Stderr = cmd.Stdout
- err := cmd.Run()
- return buf.Bytes(), err
-}
-
-var frontPage = template.Must(template.New("frontPage").Parse(frontPageText)) // HTML template
-var output = template.Must(template.New("output").Parse(outputText)) // HTML template
-
-var outputText = `<pre>{{printf "%s" . |html}}</pre>`
-
-var frontPageText = `<!doctype html>
-<html>
-<head>
-<style>
-pre, textarea {
- font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace;
- font-size: 100%;
-}
-.hints {
- font-size: 0.8em;
- text-align: right;
-}
-#edit, #output, #errors { width: 100%; text-align: left; }
-#edit { height: 500px; }
-#output { color: #00c; }
-#errors { color: #c00; }
-</style>
-<script>
-
-function insertTabs(n) {
- // find the selection start and end
- var cont = document.getElementById("edit");
- var start = cont.selectionStart;
- var end = cont.selectionEnd;
- // split the textarea content into two, and insert n tabs
- var v = cont.value;
- var u = v.substr(0, start);
- for (var i=0; i<n; i++) {
- u += "\t";
- }
- u += v.substr(end);
- // set revised content
- cont.value = u;
- // reset caret position after inserted tabs
- cont.selectionStart = start+n;
- cont.selectionEnd = start+n;
-}
-
-function autoindent(el) {
- var curpos = el.selectionStart;
- var tabs = 0;
- while (curpos > 0) {
- curpos--;
- if (el.value[curpos] == "\t") {
- tabs++;
- } else if (tabs > 0 || el.value[curpos] == "\n") {
- break;
- }
- }
- setTimeout(function() {
- insertTabs(tabs);
- }, 1);
-}
-
-function preventDefault(e) {
- if (e.preventDefault) {
- e.preventDefault();
- } else {
- e.cancelBubble = true;
- }
-}
-
-function keyHandler(event) {
- var e = window.event || event;
- if (e.keyCode == 9) { // tab
- insertTabs(1);
- preventDefault(e);
- return false;
- }
- if (e.keyCode == 13) { // enter
- if (e.shiftKey) { // +shift
- compile(e.target);
- preventDefault(e);
- return false;
- } else {
- autoindent(e.target);
- }
- }
- return true;
-}
-
-var xmlreq;
-
-function autocompile() {
- if(!document.getElementById("autocompile").checked) {
- return;
- }
- compile();
-}
-
-function compile() {
- var prog = document.getElementById("edit").value;
- var req = new XMLHttpRequest();
- xmlreq = req;
- req.onreadystatechange = compileUpdate;
- req.open("POST", "/compile", true);
- req.setRequestHeader("Content-Type", "text/plain; charset=utf-8");
- req.send(prog);
-}
-
-function compileUpdate() {
- var req = xmlreq;
- if(!req || req.readyState != 4) {
- return;
- }
- if(req.status == 200) {
- document.getElementById("output").innerHTML = req.responseText;
- document.getElementById("errors").innerHTML = "";
- } else {
- document.getElementById("errors").innerHTML = req.responseText;
- document.getElementById("output").innerHTML = "";
- }
-}
-</script>
-</head>
-<body>
-<table width="100%"><tr><td width="60%" valign="top">
-<textarea autofocus="true" id="edit" spellcheck="false" onkeydown="keyHandler(event);" onkeyup="autocompile();">{{printf "%s" . |html}}</textarea>
-<div class="hints">
-(Shift-Enter to compile and run.)
-<input type="checkbox" id="autocompile" value="checked" /> Compile and run after each keystroke
-</div>
-<td width="3%">
-<td width="27%" align="right" valign="top">
-<div id="output"></div>
-</table>
-<div id="errors"></div>
-</body>
-</html>
-`
-
-var helloWorld = []byte(`package main
-
-import "fmt"
-
-func main() {
- fmt.Println("hello, world")
-}
-`)