Implement randomisation of choices

eos/base/election.py

@@ -15,6 +15,7 @@
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from eos.core.objects import *
+from eos.core.bigint import *
 from eos.base.workflow import *
 
 class Answer(EmbeddedObject):
@@ -110,11 +111,12 @@ class Result(EmbeddedObject):
 	pass
 
 class ListChoiceQuestion(Question):
-	_ver = StringField(default='0.4')
+	_ver = StringField(default='0.5')
 	
 	choices = EmbeddedObjectListField()
 	min_choices = IntField()
 	max_choices = IntField()
+	randomise_choices = BooleanField(default=False)
 	
 	def pretty_answer(self, answer):
 		if len(answer.choices) == 0:
@@ -137,6 +139,21 @@ class ListChoiceQuestion(Question):
 				flat_choices.append(choice)
 		return flat_choices
 	
+	def randomised_choices(self):
+		if not self.randomise_choices:
+			return self.choices
+		else:
+			# Clone list
+			output = EosList([x for x in self.choices])
+			# Fisher-Yates shuffle
+			i = len(output)
+			while i != 0:
+				rnd = BigInt.noncrypto_random(0, i - 1)
+				rnd = rnd.__int__()
+				i -= 1
+				output[rnd], output[i] = output[i], output[rnd]
+			return output
+
 class ApprovalAnswer(Answer):
 	choices = ListField(IntField())
 

eos/core/objects/__init__.py

@@ -83,6 +83,7 @@ class PrimitiveField(Field):
 DictField = PrimitiveField
 IntField = PrimitiveField
 StringField = PrimitiveField
+BooleanField = PrimitiveField
 
 class EmbeddedObjectField(Field):
 	def __init__(self, object_type=None, *args, **kwargs):

eosweb/core/main.py

@@ -129,7 +129,7 @@ def setup_test_election():
 			Choice(name='Joe Bloggs', party='Independent ACME')
 		]),
 		Choice(name='John Q. Public')
-	], min_choices=0, max_choices=3)
+	], min_choices=0, max_choices=3, randomise_choices=True)
 	election.questions.append(question)
 	
 	question = ApprovalQuestion(prompt='Chairman', choices=[Choice(name='John Doe'), Choice(name='Andrew Citizen')], min_choices=0, max_choices=1)

eosweb/core/static/nunjucks/question/approval/selections_make.html

@@ -22,11 +22,11 @@
 
 <div id="question-choices" class="ui form" style="margin-bottom: 1em;">
 	<div class="grouped fields">
-		{% for choice in election.questions.__getitem__(questionNum).choices.impl %}
+		{% for choice in election.questions.__getitem__(questionNum).randomised_choices().impl %}
 			<div class="field">
 				<div class="ui checkbox">
-					<input type="checkbox" id="question-choice-{{ loop.index0 }}" onchange="choicesChanged();">
-					<label for="question-choice-{{ loop.index0 }}">{{ choice.name }}{% if choice.party %} – {{ choice.party }}{% endif %}</label>
+					<input type="checkbox" id="question-choice-{{ election.questions.__getitem__(questionNum).choices.impl.indexOf(choice) }}" onchange="choicesChanged();">
+					<label for="question-choice-{{ election.questions.__getitem__(questionNum).choices.impl.indexOf(choice) }}">{{ choice.name }}{% if choice.party %} – {{ choice.party }}{% endif %}</label>
 				</div>
 			</div>
 		{% endfor %}

eosweb/core/static/nunjucks/question/preferential/selections_make.html

@@ -58,10 +58,10 @@
 	<div>Options not yet voted for:</div>
 	<div class="dragarea">
 		<div class="dragarea-hint"></div>
-		{% for choice in election.questions.__getitem__(questionNum).choices.impl %}
+		{% for choice in election.questions.__getitem__(questionNum).randomised_choices().impl %}
 			{% if choice.choices %}
 				{# Ticket #}
-				<div class="preferential-choice ticket" data-ticketno="{{ loop.index0 }}">
+				<div class="preferential-choice ticket">
 					<div class="number"></div>
 					<div class="content">
 						<div class="party-name">{{ choice.name }}</div>

eosweb/core/templates/question/approval/view.html

@@ -16,7 +16,7 @@
 	along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #}
 
-<p><small>Approval voting. Vote for between {{ question.min_choices }} and {{ question.max_choices }} choices.</small></p>
+<p><small>Approval voting. Vote for between {{ question.min_choices }} and {{ question.max_choices }} choices.{% if question.randomise_choices %} Order of choices is randomised.{% endif %}</small></p>
 
 <ul class="ui list">
 	{% for choice in question.choices %}

eosweb/core/templates/question/preferential/view.html

@@ -16,7 +16,7 @@
 	along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #}
 
-<p><small>Preferential voting. Vote for between {{ question.min_choices }} and {{ question.max_choices }} choices.</small></p>
+<p><small>Preferential voting. Vote for between {{ question.min_choices }} and {{ question.max_choices }} choices.{% if question.randomise_choices %} Order of choices is randomised.{% endif %}</small></p>
 
 <ul class="ui list">
 	{% for choice in question.choices %}