434 lines
11 KiB
JavaScript
434 lines
11 KiB
JavaScript
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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In the absence of any formal way to specify interfaces in JavaScript,
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here's a skeleton implementation of a playground transport.
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function Transport() {
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// Set up any transport state (eg, make a websocket connection).
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return {
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Run: function(body, output, options) {
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// Compile and run the program 'body' with 'options'.
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// Call the 'output' callback to display program output.
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return {
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Kill: function() {
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// Kill the running program.
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}
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};
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}
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};
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}
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// The output callback is called multiple times, and each time it is
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// passed an object of this form.
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var write = {
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Kind: 'string', // 'start', 'stdout', 'stderr', 'end'
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Body: 'string' // content of write or end status message
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}
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// The first call must be of Kind 'start' with no body.
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// Subsequent calls may be of Kind 'stdout' or 'stderr'
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// and must have a non-null Body string.
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// The final call should be of Kind 'end' with an optional
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// Body string, signifying a failure ("killed", for example).
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// The output callback must be of this form.
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// See PlaygroundOutput (below) for an implementation.
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function outputCallback(write) {
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}
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*/
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function HTTPTransport() {
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'use strict';
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// TODO(adg): support stderr
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function playback(output, events) {
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var timeout;
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output({Kind: 'start'});
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function next() {
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if (!events || events.length === 0) {
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output({Kind: 'end'});
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return;
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}
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var e = events.shift();
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if (e.Delay === 0) {
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output({Kind: 'stdout', Body: e.Message});
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next();
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return;
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}
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timeout = setTimeout(function() {
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output({Kind: 'stdout', Body: e.Message});
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next();
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}, e.Delay / 1000000);
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}
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next();
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return {
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Stop: function() {
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clearTimeout(timeout);
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}
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}
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}
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function error(output, msg) {
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output({Kind: 'start'});
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output({Kind: 'stderr', Body: msg});
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output({Kind: 'end'});
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}
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var seq = 0;
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return {
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Run: function(body, output, options) {
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seq++;
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var cur = seq;
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var playing;
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$.ajax('/compile', {
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type: 'POST',
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data: {'version': 2, 'body': body},
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dataType: 'json',
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success: function(data) {
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if (seq != cur) return;
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if (!data) return;
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if (playing != null) playing.Stop();
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if (data.Errors) {
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error(output, data.Errors);
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return;
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}
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playing = playback(output, data.Events);
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},
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error: function() {
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error(output, 'Error communicating with remote server.');
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}
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});
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return {
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Kill: function() {
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if (playing != null) playing.Stop();
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output({Kind: 'end', Body: 'killed'});
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}
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};
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}
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};
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}
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function SocketTransport() {
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'use strict';
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var id = 0;
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var outputs = {};
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var started = {};
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var websocket = new WebSocket('ws://' + window.location.host + '/socket');
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websocket.onclose = function() {
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console.log('websocket connection closed');
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}
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websocket.onmessage = function(e) {
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var m = JSON.parse(e.data);
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var output = outputs[m.Id];
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if (output === null)
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return;
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if (!started[m.Id]) {
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output({Kind: 'start'});
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started[m.Id] = true;
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}
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output({Kind: m.Kind, Body: m.Body});
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}
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function send(m) {
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websocket.send(JSON.stringify(m));
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}
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return {
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Run: function(body, output, options) {
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var thisID = id+'';
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id++;
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outputs[thisID] = output;
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send({Id: thisID, Kind: 'run', Body: body, Options: options});
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return {
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Kill: function() {
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send({Id: thisID, Kind: 'kill'});
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}
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};
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}
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};
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}
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function PlaygroundOutput(el) {
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'use strict';
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return function(write) {
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if (write.Kind == 'start') {
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el.innerHTML = '';
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return;
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}
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var cl = 'system';
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if (write.Kind == 'stdout' || write.Kind == 'stderr')
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cl = write.Kind;
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var m = write.Body;
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if (write.Kind == 'end')
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m = '\nProgram exited' + (m?(': '+m):'.');
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if (m.indexOf('IMAGE:') === 0) {
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// TODO(adg): buffer all writes before creating image
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var url = 'data:image/png;base64,' + m.substr(6);
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var img = document.createElement('img');
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img.src = url;
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el.appendChild(img);
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return;
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}
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// ^L clears the screen.
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var s = m.split('\x0c');
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if (s.length > 1) {
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el.innerHTML = '';
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m = s.pop();
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}
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m = m.replace(/&/g, '&');
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m = m.replace(/</g, '<');
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m = m.replace(/>/g, '>');
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var needScroll = (el.scrollTop + el.offsetHeight) == el.scrollHeight;
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var span = document.createElement('span');
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span.className = cl;
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span.innerHTML = m;
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el.appendChild(span);
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if (needScroll)
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el.scrollTop = el.scrollHeight - el.offsetHeight;
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}
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}
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(function() {
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function lineHighlight(error) {
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var regex = /prog.go:([0-9]+)/g;
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var r = regex.exec(error);
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while (r) {
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$(".lines div").eq(r[1]-1).addClass("lineerror");
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r = regex.exec(error);
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}
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}
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function highlightOutput(wrappedOutput) {
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return function(write) {
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if (write.Body) lineHighlight(write.Body);
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wrappedOutput(write);
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}
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}
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function lineClear() {
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$(".lineerror").removeClass("lineerror");
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}
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// opts is an object with these keys
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// codeEl - code editor element
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// outputEl - program output element
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// runEl - run button element
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// fmtEl - fmt button element (optional)
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// fmtImportEl - fmt "imports" checkbox element (optional)
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// shareEl - share button element (optional)
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// shareURLEl - share URL text input element (optional)
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// shareRedirect - base URL to redirect to on share (optional)
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// toysEl - toys select element (optional)
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// enableHistory - enable using HTML5 history API (optional)
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// transport - playground transport to use (default is HTTPTransport)
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function playground(opts) {
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var code = $(opts.codeEl);
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var transport = opts['transport'] || new HTTPTransport();
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var running;
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// autoindent helpers.
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function insertTabs(n) {
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// find the selection start and end
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var start = code[0].selectionStart;
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var end = code[0].selectionEnd;
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// split the textarea content into two, and insert n tabs
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var v = code[0].value;
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var u = v.substr(0, start);
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for (var i=0; i<n; i++) {
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u += "\t";
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}
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u += v.substr(end);
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// set revised content
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code[0].value = u;
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// reset caret position after inserted tabs
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code[0].selectionStart = start+n;
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code[0].selectionEnd = start+n;
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}
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function autoindent(el) {
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var curpos = el.selectionStart;
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var tabs = 0;
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while (curpos > 0) {
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curpos--;
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if (el.value[curpos] == "\t") {
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tabs++;
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} else if (tabs > 0 || el.value[curpos] == "\n") {
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break;
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}
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}
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setTimeout(function() {
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insertTabs(tabs);
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}, 1);
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}
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function keyHandler(e) {
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if (e.keyCode == 9 && !e.ctrlKey) { // tab (but not ctrl-tab)
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insertTabs(1);
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e.preventDefault();
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return false;
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}
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if (e.keyCode == 13) { // enter
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if (e.shiftKey) { // +shift
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run();
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e.preventDefault();
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return false;
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} if (e.ctrlKey) { // +control
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fmt();
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e.preventDefault();
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} else {
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autoindent(e.target);
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}
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}
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return true;
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}
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code.unbind('keydown').bind('keydown', keyHandler);
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var outdiv = $(opts.outputEl).empty();
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var output = $('<pre/>').appendTo(outdiv);
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function body() {
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return $(opts.codeEl).val();
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}
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function setBody(text) {
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$(opts.codeEl).val(text);
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}
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function origin(href) {
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return (""+href).split("/").slice(0, 3).join("/");
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}
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var pushedEmpty = (window.location.pathname == "/");
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function inputChanged() {
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if (pushedEmpty) {
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return;
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}
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pushedEmpty = true;
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$(opts.shareURLEl).hide();
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window.history.pushState(null, "", "/");
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}
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function popState(e) {
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if (e === null) {
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return;
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}
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if (e && e.state && e.state.code) {
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setBody(e.state.code);
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}
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}
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var rewriteHistory = false;
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if (window.history && window.history.pushState && window.addEventListener && opts.enableHistory) {
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rewriteHistory = true;
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code[0].addEventListener('input', inputChanged);
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window.addEventListener('popstate', popState);
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}
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function setError(error) {
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if (running) running.Kill();
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lineClear();
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lineHighlight(error);
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output.empty().addClass("error").text(error);
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}
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function loading() {
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lineClear();
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if (running) running.Kill();
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output.removeClass("error").text('Waiting for remote server...');
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}
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function run() {
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loading();
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running = transport.Run(body(), highlightOutput(PlaygroundOutput(output[0])));
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}
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function fmt() {
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loading();
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var data = {"body": body()};
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if ($(opts.fmtImportEl).is(":checked")) {
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data["imports"] = "true";
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}
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$.ajax("/fmt", {
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data: data,
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type: "POST",
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dataType: "json",
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success: function(data) {
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if (data.Error) {
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setError(data.Error);
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} else {
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setBody(data.Body);
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setError("");
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}
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}
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});
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}
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$(opts.runEl).click(run);
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$(opts.fmtEl).click(fmt);
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if (opts.shareEl !== null && (opts.shareURLEl !== null || opts.shareRedirect !== null)) {
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var shareURL;
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if (opts.shareURLEl) {
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shareURL = $(opts.shareURLEl).hide();
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}
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var sharing = false;
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$(opts.shareEl).click(function() {
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if (sharing) return;
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sharing = true;
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var sharingData = body();
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$.ajax("/share", {
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processData: false,
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data: sharingData,
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type: "POST",
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complete: function(xhr) {
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sharing = false;
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if (xhr.status != 200) {
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alert("Server error; try again.");
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return;
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}
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if (opts.shareRedirect) {
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window.location = opts.shareRedirect + xhr.responseText;
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}
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if (shareURL) {
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var path = "/p/" + xhr.responseText;
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var url = origin(window.location) + path;
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shareURL.show().val(url).focus().select();
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if (rewriteHistory) {
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var historyData = {"code": sharingData};
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window.history.pushState(historyData, "", path);
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pushedEmpty = false;
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}
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}
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}
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});
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});
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}
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if (opts.toysEl !== null) {
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$(opts.toysEl).bind('change', function() {
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var toy = $(this).val();
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$.ajax("/doc/play/"+toy, {
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processData: false,
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type: "GET",
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complete: function(xhr) {
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if (xhr.status != 200) {
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alert("Server error; try again.");
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return;
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}
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setBody(xhr.responseText);
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}
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});
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});
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}
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}
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window.playground = playground;
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})();
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