Refactor this shit

web/ssparser.js

@@ -0,0 +1,96 @@
+function parseLine(line) {
+
+	// replace newline markers with html newlines
+	var els = line.replace(/⎊/g, '<br>').split('\t')
+
+	var q = {}
+
+	if (els[0] != '') {
+		if (	els[0] == 'ChooseOne' ||
+				els[0] == 'ChooseAny' ||
+				els[0] == 'Text') {
+			q.type = els[0]
+		} else {
+			alert('Invalid type given on one line')
+			return null
+		}
+	} else {
+		alert('No type given on one line')
+		return null
+	}
+
+	if (els[1]) {
+		q.question = els[1]
+	} else {
+		alert('No question given on one line')
+		return null
+	}
+
+	// Split choices into array
+	// Choices for text questions are labels
+	// No choices (empty string) are okay for text questions
+	// Also filter out empty lines because some people can't use spreadsheets
+	if (els[2] || (q.type == 'Text' && els[2] == '')) {
+		q.choices = els[2].split('<br>').filter(el => el != "")
+	} else {
+		alert('No choices given at question "'
+			+ q.question + '"')
+		return null
+	}
+
+	// If multiple answers are allowed, they are newline-separated
+	// Also filter out empty lines because some people can't use spreadsheets
+	if (els[3] && els[3] != '') {
+		q.answers = els[3].split('<br>').filter(el => el != "")
+	} else {
+		alert('No answers given at question "'
+			+ q.question + '"')
+		return null
+	}
+
+	// Optional parameters
+	q.explanation	= els[4] || '[No explanation provided]'
+	q.author		= els[5] || '[No author provided]'
+	q.picture		= els[6] || null
+
+	return q
+
+}
+
+
+function parseSpreadsheet() {
+
+	console.log('Parsing spreadsheet data')
+
+	var textEl = document.getElementById('questions')
+
+	/* MAGIC:
+	 *	1. Find quoted multiline cells (<tab>"a<newline>b"<tab>)
+	 *	2. Replace all newlines inside with a special char so the cell won't be
+	 *		split later (<tab>"a<specialchar>b"<tab>)
+	 *	3. Replace escaped quotes ("a ""b"" c") with single ones ("a "b" c")
+	 *	4. Remove the outer quotes and tabs (a<specialchar>b)
+	 *	5. Replace all tabs inside with spaces
+	 *	6. Re-add outer tabs (<tab>a<specialchar>b<tab>)
+	 */
+
+	var text = textEl.value.replace(/\t"([^"\n]|"")+\n([^"]|"")*"/g,
+		m => m.replace(/\n/g, '⎊')
+			  .replace(/""/g, '"')
+			  .replace(/^\t"(.*)"$/, '$1')
+			  .replace(/\t/g, ' ')
+			  .replace(/^(.*)$/g, '\t$1')
+	)
+
+	state.questions = text.split('\n').map(parseLine)
+
+	if (state.questions.some(el => el == null)) {
+		alert('Erroneous data. Please check and re-enter.')
+		return {success: false}
+	}
+
+	localStorage.setItem('state', JSON.stringify(state))
+
+	return {success: true}
+
+}