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/**
* Handler for a Prolog assignment. Works with the corresponding prolog.html content.
*/
(function () {
/**
* Creates a new handler for the given Prolog assignment definition.
*
* @param {PrologTaskDef} info
* @returns {{destroy: Function, processServerHints: Function}}
*/
codeq.createPrologHandler = function (info) {
var jqDescription = $('#description'),
jqEditor = $('#code_editor'),
jqConsole = $('#console'),
jqHints = $('#info'),
editor = CodeMirror(jqEditor[0], { cursorHeight: 0.85, lineNumbers: true, matchBrackets: true }),
controller = jqConsole.console({
promptLabel: '?- ',
commandValidate: function (line) {
return !!line;
},
commandHandle: function (line) {
return [{msg:'Not implemented.', className:'console-response'}];
},
autofocus: false,
animateScroll: false,
promptHistory: false,
welcomeMessage: 'Prolog REPL.'
}),
/** Object.<string, HintDefinition> */ hintDefs = info.hint,
hintCounter = 0, // for generating unique class-names
hintCleaners = [],
clearHints = function () {
var i;
for (i = hintCleaners.length - 1; i >= 0; i--) {
hintCleaners[i]();
}
hintCleaners.length = 0;
hintCounter = 0;
},
addMark = function (start, end) {
var posStart = editor.posFromIndex(start),
posEnd = editor.posFromIndex(end),
doc = editor.getDoc(),
mark = doc.markText(posStart, posEnd, {className: 'editor-mark _emark_' + hintCounter}),
result = {start: posStart, end: posEnd, mark: mark, className: '_emark_' + hintCounter};
hintCleaners.push(function () { mark.clear(); mark = null; doc = null; result.mark = null; });
hintCounter++;
return result;
},
hintHandlers = {
'static': function (type, template, serverHint) {
codeq.log.debug('Processing static hint');
jqHints.append(template); // TODO: incorporate any serverHint.args
// no hint cleaner here, a static hint remains on the screen
},
'popup': function (type, template, serverHint) {
codeq.log.debug('Processing popup hint');
var mark = addMark(serverHint.start, serverHint.end), // add the mark
jqMark = jqEditor.find('.' + mark.className),
jqPopup = null,
onBlur = function () {
codeq.log.debug('Removing popup');
if (jqPopup) {
jqPopup.off('blur', onBlur);
jqPopup.remove();
jqPopup = null;
}
};
window.jqMark = jqMark; // TODO: DEBUG
jqMark.on('click', function () {
if (jqPopup) return;
codeq.log.debug('Showing popup');
var pos = mark.mark.find(), // results in {from: {line: number, ch: number}, to: {line: number, ch: number}}
left = pos.from.ch < pos.to.ch ? pos.from.ch : pos.to.ch,
down = pos.from.line < pos.to.line ? pos.to.line : pos.from.line;
jqPopup = $('<div style="position: absolute;" class="editor-popup ' + mark.className + '"></div>').html(template);
editor.addWidget({line: down, ch: left}, jqPopup[0], true);
jqPopup = jqEditor.find('.editor-popup.' + mark.className);
setTimeout(function () {jqPopup.trigger('focus'); jqPopup.on('click', onBlur);}, 50); // event handlers can be registered only when the DOM elements is part of the document
window.jqPopup = jqPopup; // TODO: DEBUG
});
hintCleaners.push(function () {
if (jqPopup) {
jqPopup.off('blur', onBlur);
jqPopup.remove();
jqPopup = null;
}
if (jqMark) {
jqMark = null;
}
mark = null;
});
},
'dropdown': function (type, template, serverHint) {
codeq.log.debug('Processing dropdown hint');
var completion = null, // the completion object, created in showHint()
close = function () {
if (completion) {
completion.close();
completion = null;
}
};
if ((editor.listSelections().length > 1) || editor.somethingSelected()) {
// showHint() doesn't work if a selection is active
}
editor.showHint({
hint: function () {
var hints = {
list: serverHint.choices,
from: editor.posFromIndex(serverHint.start),
to: editor.posFromIndex(serverHint.end)
};
completion = editor.state.completionActive;
return hints;
},
completeOnSingleClick: true,
completeSingle: false
});
hintCleaners.push(close);
}
};
editor.setValue('sister(X, Y) :-\n female(X),\n parent(Z, X),\n parent(Z, Y),\n X \\== Y.'); // demo
jqDescription.html(info.description);
return {
destroy: function () {
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
jqHints.empty(); // TODO: just make static references to these
jqDescription = null;
jqEditor = null;
jqConsole = null;
jqHints = null;
},
/**
* Processes and display appropriately the server hints.
* TODO: sort hints so static and popup hints come first, and a (single) drop-down hint last
*
* @param {ServerHint[]} serverHints an array of hints from the server
*/
processServerHints: function (serverHints) {
var n = serverHints.length,
/** number */ i,
/** ServerHint */ serverHint,
/** HintDefinition */ hintDef,
hintType, hintTemplate, t, fn;
clearHints();
for (i = 0; i < n; i++) {
serverHint = serverHints[i];
hintDef = hintDefs[serverHint.id];
if (!hintDef) {
codeq.log.error('Undefined hint: ' + serverHint.id);
continue;
}
t = typeof hintDef;
if (t === 'object') {
hintType = hintDef.type;
hintTemplate = hintDef.message;
}
else if (t === 'string') {
hintType = 'static';
hintTemplate = hintDef;
}
else {
codeq.log.error('Unsupported hint definition: ' + t);
continue;
}
fn = hintHandlers[hintType];
if (!fn) codeq.log.error('Unsupported hint type: ' + hintType);
else fn(hintType, hintTemplate, serverHint);
}
}
};
};
})();
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