Created
January 2, 2010 05:57
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A Javascript REPL/console thing
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| <html> | |
| <head> | |
| <title>Javascript REPL</title> | |
| <script type="text/javascript"> | |
| function $(i){return document.getElementById(i);} | |
| </script> | |
| </head> | |
| <body> | |
| <pre><span id="repl"></span><span style="font-size:12px;">█</span></pre> | |
| <script type="text/javascript"> | |
| // Some constants | |
| var KEY_BACKSPACE = 8; | |
| var KEY_RETURN = 13; | |
| var KEY_UP = 38; | |
| var KEY_DOWN = 40; | |
| var repl = { | |
| version: "1.0" | |
| } | |
| repl.screen = { | |
| div: $("repl"), | |
| print: function(i) { | |
| repl.screen.div.innerHTML += i; | |
| }, | |
| println: function(i) { | |
| repl.screen.div.innerHTML += i + "\n"; | |
| }, | |
| backspace: function() { | |
| if (repl.command.text.length == 0) | |
| return; | |
| v = repl.screen.div.innerHTML; | |
| repl.screen.div.innerHTML = v.substring(0,v.length-1); | |
| repl.command.text = repl.command.text.substring(0,repl.command.text.length-1); | |
| }, | |
| clearline: function() { | |
| while (repl.command.text.length > 0) | |
| repl.screen.backspace(); | |
| } | |
| } | |
| repl.command = { | |
| text: '', | |
| history: [], | |
| historypos: 0, | |
| list: { | |
| "eval": function(str) { | |
| repl.screen.println(eval(str)); | |
| }, | |
| "set": function(str) { | |
| var parted = str.split(' '); | |
| repl.env[parted.shift()] = parted.join(' '); | |
| }, | |
| "env": function(str) { | |
| repl.screen.println(repl.env[str]); | |
| }, | |
| "command": function(str) { | |
| var parted = str.split(' '); | |
| var name = parted.shift(); | |
| eval('repl.command.list["' + name + '"] = function(args){' + | |
| parted.join(' ') + '}'); | |
| return name; | |
| }, | |
| "get": function(url) { | |
| if (url.indexOf(':') == -1) | |
| url = "http://"+url; | |
| repl.screen.println("Getting '"+url+"'"); | |
| try { | |
| var req = new XMLHttpRequest(); | |
| req.open('GET',url,false); req.send(null); | |
| if (req.status == 200) { | |
| repl.screen.println(req.responseText); | |
| } else { repl.screen.println("Error encountered: "+req.status); } | |
| } catch(e) { | |
| repl.screen.println("Error encountered: "+e); return; | |
| } | |
| }, | |
| "help": function(args) { | |
| repl.screen.println("jsrepl commands:\n"); | |
| place = 0; | |
| for (var i in repl.command.list) { | |
| if (place == 3) { | |
| place = 0; repl.screen.print("\n"); | |
| } | |
| repl.screen.print(i); | |
| var diff = 15 - i.length; | |
| for (var j = 0; j < diff; j++) { | |
| repl.screen.print(' '); | |
| } | |
| place += 1; | |
| } | |
| repl.screen.print("\n"); | |
| } | |
| }, | |
| launch: function() { | |
| repl.command.history.push(repl.command.text); | |
| input = repl.command.text; | |
| repl.command.text = ''; | |
| if (input[0] == '`') { | |
| repl.screen.println(eval(input.replace('`',''))); return; | |
| } | |
| cmd = input.split(' '); | |
| repl.command.run(cmd.shift(),cmd.join(' ')); | |
| }, | |
| run: function(cmd,args) { | |
| if (args == null) args = []; | |
| if (repl.command.list[cmd] == null) { | |
| repl.screen.println("No such command '"+cmd+"'"); | |
| return; | |
| } | |
| repl.command.list[cmd](args); | |
| }, | |
| pre_prompt: function() { | |
| document.body.style.background = repl.env.background; | |
| document.body.style.color = repl.env.foreground; | |
| } | |
| } | |
| repl.env = { | |
| user: "user", | |
| background: "#fff", | |
| foreground: "#000" | |
| } | |
| repl.input = { | |
| keyboard_event: function(evt) { | |
| if (evt.keyCode) { | |
| var keyCode = evt.keyCode; | |
| if (keyCode == KEY_BACKSPACE) { | |
| repl.screen.backspace(); | |
| } else if (keyCode == KEY_RETURN) { | |
| repl.screen.print("\n"); | |
| repl.command.launch(); | |
| repl.command.pre_prompt(); | |
| repl.screen.print(repl.env.user+"@jsrepl$ "); | |
| } else if (keyCode == KEY_UP) { | |
| return; // XXX: It doesn't work. Fuck JS. | |
| repl.screen.clearline(); | |
| if (repl.command.history.length < (-repl.command.historypos)+1) | |
| return; | |
| repl.command.historypos -= 1; | |
| repl.command.text = repl.command.history.slice(repl.command.historypos,1)[0]; | |
| repl.screen.print(repl.command.text); | |
| } else if (keyCode == KEY_DOWN) { | |
| return; // XXX: It doesn't work. Fuck JS. | |
| repl.screen.clearline(); | |
| if (repl.command.historypos == -1) | |
| return; | |
| repl.command.historypos += 1; | |
| repl.command.text = repl.command.history.slice(repl.command.historypos,1)[0]; | |
| repl.screen.print(repl.command.text); | |
| } | |
| } else { | |
| kchar = String.fromCharCode(evt.charCode); | |
| repl.screen.print(kchar); | |
| repl.command.text += kchar; | |
| } | |
| } | |
| } | |
| document.onkeypress = repl.input.keyboard_event; | |
| repl.screen.println("Javascript REPL version "+repl.version+"\n"); | |
| repl.screen.print("user@jsrepl$ "); | |
| </script> | |
| </body> | |
| </html> |
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