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https://github.com/golang/go
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48418e5732
This change adds an option to run "go vet" for the playground program and display errors before any output. To enable this, the playground function has to be supplied with opts.enableVet set to true. Vet check is performed only for succesfully run programs, meaning that the "/compile" endpoint returned no errors. This change highlights lines printed to stderr as errors (in red). There is a corresponding change for the Playground: CL 100776. Updates golang/go#7597 Updates golang/go#24576 Change-Id: I8c0f8c1189c461338b5bce57777b12aecab268fb Reviewed-on: https://go-review.googlesource.com/107455 Run-TryBot: Yury Smolsky <yury@smolsky.by> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Andrew Bonventre <andybons@golang.org>
497 lines
13 KiB
JavaScript
497 lines
13 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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// HTTPTransport is the default transport.
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// enableVet enables running vet if a program was compiled and ran successfully.
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// If vet returned any errors, display them before the output of a program.
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function HTTPTransport(enableVet) {
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'use strict';
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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: e.Kind, 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: e.Kind, 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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$.ajax('/compile', {
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type: 'POST',
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data: {'version': 2, 'body': body},
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dataType: 'json',
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success: function(data) {
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if (seq != cur) return;
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if (!data) return;
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if (playing != null) playing.Stop();
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if (data.Errors) {
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error(output, data.Errors);
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return;
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}
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if (!enableVet) {
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playing = playback(output, data.Events);
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return;
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}
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$.ajax("/vet", {
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data: {"body": body},
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type: "POST",
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dataType: "json",
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success: function(dataVet) {
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if (dataVet.Errors) {
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// inject errors from the vet as the first event in the output
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data.Events.unshift({Message: 'Go vet exited.\n\n', Kind: 'system', Delay: 0});
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data.Events.unshift({Message: dataVet.Errors, Kind: 'stderr', Delay: 0});
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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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playing = playback(output, data.Events);
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}
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});
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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;
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if (window.location.protocol == "http:") {
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websocket = new WebSocket('ws://' + window.location.host + '/socket');
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} else if (window.location.protocol == "https:") {
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websocket = new WebSocket('wss://' + window.location.host + '/socket');
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}
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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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}
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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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// enableShortcuts - whether to enable shortcuts (Ctrl+S/Cmd+S to save) (default is false)
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// enableVet - enable running vet and displaying its errors
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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(opts['enableVet']);
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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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// NOTE(cbro): e is a jQuery event, not a DOM event.
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function handleSaveShortcut(e) {
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if (e.isDefaultPrevented()) return false;
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if (!e.metaKey && !e.ctrlKey) return false;
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if (e.key != "S" && e.key != "s") return false;
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e.preventDefault();
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// Share and save
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share(function(url) {
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window.location.href = url + ".go?download=true";
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});
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return true;
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}
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function keyHandler(e) {
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if (opts.enableShortcuts && handleSaveShortcut(e)) return;
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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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$.ajax("/fmt", {
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data: data,
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type: "POST",
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dataType: "json",
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success: function(data) {
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if (data.Error) {
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setError(data.Error);
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} else {
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setBody(data.Body);
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setError("");
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}
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}
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});
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}
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var shareURL; // jQuery element to show the shared URL.
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var sharing = false; // true if there is a pending request.
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var shareCallbacks = [];
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function share(opt_callback) {
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if (opt_callback) shareCallbacks.push(opt_callback);
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if (sharing) return;
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sharing = true;
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var sharingData = body();
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$.ajax("/share", {
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processData: false,
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data: sharingData,
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type: "POST",
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contentType: "text/plain; charset=utf-8",
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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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var path = "/p/" + xhr.responseText;
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var url = origin(window.location) + path;
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for (var i = 0; i < shareCallbacks.length; i++) {
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shareCallbacks[i](url);
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}
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shareCallbacks = [];
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if (shareURL) {
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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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$(opts.runEl).click(run);
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$(opts.fmtEl).click(fmt);
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if (opts.shareEl !== null && (opts.shareURLEl !== null || opts.shareRedirect !== null)) {
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if (opts.shareURLEl) {
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shareURL = $(opts.shareURLEl).hide();
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}
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$(opts.shareEl).click(function() {
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share();
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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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