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var _ = require('lodash');
function isQuizNode(node) {
return (/^[(\[][ x][)\]]/).test(node.text || node);
}
function isTableQuestion(nodes) {
var block = questionBlock(nodes);
return (
block.length === 1 &&
block[0].type === 'table' &&
_.all(block[0].cells[0].slice(1), isQuizNode)
);
}
function isListQuestion(nodes) {
var block = questionBlock(nodes);
// Counter of when we go in and out of lists
var inlist = 0;
// Number of lists we found
var lists = 0;
// Elements found outside a list
var outsiders = 0;
// Ensure that we have nothing except lists
_.each(block, function(node) {
if(node.type === 'list_start') {
inlist++;
} else if(node.type === 'list_end') {
inlist--;
lists++;
} else if(inlist === 0) {
// Found non list_start or list_end whilst outside a list
outsiders++;
}
});
return lists > 0 && outsiders === 0;
}
function isQuestion(nodes) {
return isListQuestion(nodes) || isTableQuestion(nodes);
}
// Remove (optional) paragraph header node and blockquote
function questionBlock(nodes) {
return nodes.slice(
nodes[0].type === 'paragraph' ? 1 : 0,
_.findIndex(nodes, { type: 'blockquote_start' })
);
}
function splitQuestions(nodes) {
// Represents nodes in current question
var buffer = [];
return _.reduce(nodes, function(accu, node) {
// Add node to buffer
buffer.push(node);
// Flush buffer once we hit the end of a question
if(node.type === 'blockquote_end') {
accu.push(buffer);
// Clear buffer
buffer = [];
}
return accu;
}, []);
}
function isQuiz(nodes) {
// Extract potential questions
var questions = splitQuestions(nodes);
// Nothing that looks like questions
if(questions.length === 0) {
return false;
}
// Ensure all questions are correctly structured
return _.all(questions, isQuestion);
}
module.exports = isQuiz;
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