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/**
* Handler for a Prolog assignment. Works with the corresponding prolog.html content.
*/
(function () {
// a constant
var firstCharacterPos = {'line': 0, 'ch': 0};
var makePrologTerminalHandler = function (jqConsole, editor, problem_id, activityHandler) {
var promptMode = true, // default: query composition; alternative: query result browsing
manualStop = false, // if the user stopped showing next answers (false) or if there are no more answers (true)
terminal = codeq.makeConsole(jqConsole, {
'greeting': 'CodeQ Prolog terminal proxy'
}),
tcs = function terminalCommandSuccess (data) {
var t, lines, i;
if (data.code === 0) {
t = data.terminal;
terminal.append(t.messages.join('\n'), 'output');
promptMode = !t.have_more;
}
else {
terminal.append(data.message, 'error');
promptMode = true;
}
if (promptMode) {
terminal.setLineBuffered();
terminal.append(manualStop ? '?- ' : '.\n?- ', 'output');
}
},
tcf = function terminalCommandFailed (error) {
promptMode = true;
terminal.setLineBuffered();
terminal.append(error + '\n', 'error');
terminal.append('?- ', 'output');
};
terminal.onKeypress = function (c) {
if (promptMode) return c; // query composition: return the character unchanged
switch (c) {
case ' ':
case ';':
case '\n':
return ';'; // show next answer on space, semicolon or enter
default:
return '.'; // everything else: stop searching for answers
}
};
terminal.onInput = function (command) {
if (promptMode) {
promptMode = false;
manualStop = false;
terminal.setNotBuffered();
return codeq.comms.sendQuery({
'problem_id': problem_id,
'step': 'run',
'program': editor.getDoc().getValue(),
'query': command,
'trace': activityHandler.addAndPurge({'typ': 'slv', 'qry': command})
}, problem_id).then(tcs, tcf);
}
else {
terminal.append('\n', 'input');
if (command == ';') {
// show next answer
return codeq.comms.sendQuery({
'problem_id': problem_id,
'step': 'next',
'trace': activityHandler.addAndPurge({'typ': 'nxt'})
}, problem_id).then(tcs, tcf);
}
else {
// stop searching for answers
manualStop = true;
return codeq.comms.sendQuery({
'problem_id': problem_id,
'step': 'end',
'trace': activityHandler.addAndPurge({'typ': 'stp'})
}, problem_id).then(tcs, tcf);
}
}
};
terminal.leftmostCol = 3;
terminal.append('?- ', 'output');
return terminal;
};
var makeActivityHandler = function (editor, problem_id) {
var lastActivityMillis = Date.now(),
deltaActivityMillis = function deltaActivityMillisFunc () {
var now = Date.now(),
dt = now - lastActivityMillis;
lastActivityMillis = now;
return dt;
},
queue = [],
ts = null,
timer = function () {
var promise;
ts = null;
if (queue.length === 0) return Q(true);
promise = codeq.comms.sendActivity(queue, editor.getDoc().getValue(), problem_id);
queue.length = 0;
return promise;
},
flush = function () {
clearTimeout(ts);
return timer();
};
return {
'queueTrace': function (trace) {
trace['dt'] = deltaActivityMillis();
queue.push(trace);
if (ts === null) ts = setTimeout(timer, 10000); // flush every 10 seconds
return this;
},
'flush': flush,
'addAndPurge': function (trace) {
var accumulatedTrace = queue;
queue = [];
trace['dt'] = deltaActivityMillis();
accumulatedTrace.push(trace);
if (ts !== null) {
clearTimeout(ts);
ts = null;
}
return accumulatedTrace;
}
};
};
/**
* Creates a new handler for the given Prolog assignment definition.
*
* @param {PrologTaskDef} info
* @returns {{destroy: Function, processServerHints: Function}}
*/
codeq.createPrologHandler = function (info) {
var problem = info.problem,
jqDescription = $('#description'),
jqEditor = $('#code_editor'),
jqConsole = $('#console'),
jqHints = $('#info'),
editor = CodeMirror(jqEditor[0], { cursorHeight: 0.85, lineNumbers: true, matchBrackets: true }),
activityHandler = makeActivityHandler(editor, problem.id),
terminal = makePrologTerminalHandler(jqConsole, editor, problem.id, activityHandler),
hinter = codeq.makeHinter(jqHints, jqEditor, editor, problem.hint);
editor.setValue(info.solution);
$('#title').text(problem.slug);
jqDescription.html(problem.description);
editor.on('change', function (instance, changeObj) {
var doc = editor.getDoc(),
pos = codeq.codePointCount(doc.getRange(firstCharacterPos, changeObj.from));
if (changeObj.removed) {
activityHandler.queueTrace({'typ': 'rm', 'off': pos, 'len': codeq.codePointCount(changeObj.removed.join(''))});
}
if (changeObj.text) {
activityHandler.queueTrace({'typ': 'ins', 'off': pos, 'txt': changeObj.text});
}
});
$('#btn_code_hint').on('click', function () {
terminal.append('hint.\n', 'input');
terminal.inputDisable();
var doc = editor.getDoc();
codeq.comms.sendHint({
'language': 'prolog',
'program': editor.getDoc().getValue(),
'problem_id': problem.id
})
.then(
function hintSuccess(data) {
if (data.code === 0)
hinter.handle(data.hints);
else
terminal.append(data.message + '\n', 'error');
},
function hintFailed (error) {
terminal.append(error + '\n', 'error');
}
)
.fin(function () {
terminal.inputEnable();
terminal.append('?- ', 'output');
})
.done();
});
$('#btn_code_test').on('click', function () {
terminal.append('test.\n', 'input');
terminal.inputDisable();
var doc = editor.getDoc();
codeq.comms.sendTest({
'language': 'prolog',
'program': editor.getDoc().getValue(),
'problem_id': problem.id
})
.then(
function testSuccess(data) {
if (data.code === 0)
hinter.handle(data.hints);
else
terminal.append(data.message + '\n', 'error');
},
function testFailed (error) {
terminal.append(error + '\n', 'error');
}
)
.fin(function () {
terminal.inputEnable();
terminal.append('?- ', 'output');
})
.done();
});
return {
destroy: function () {
hinter.destroy();
terminal.destroy();
jqDescription.empty();
jqEditor.empty(); // TODO: perhaps you do not want to "free" the editor, just empty it
jqConsole.empty(); // TODO: the same with the console
jqDescription = null;
jqEditor = null;
jqConsole = null;
jqHints = null;
}
};
};
})();
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