Fixed #2026 -- Added support for 'and' in template 'if' tags, added dozens of unit tests and updated docs. Thanks, ckknight
git-svn-id: http://code.djangoproject.com/svn/django/trunk@3108 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
parent
14c159d21d
commit
e5cd46d6d1
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@ -149,9 +149,10 @@ class IfEqualNode(Node):
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return self.nodelist_false.render(context)
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class IfNode(Node):
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def __init__(self, bool_exprs, nodelist_true, nodelist_false):
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def __init__(self, bool_exprs, nodelist_true, nodelist_false, link_type):
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self.bool_exprs = bool_exprs
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self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
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self.link_type = link_type
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def __repr__(self):
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return "<If node>"
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@ -171,6 +172,7 @@ class IfNode(Node):
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return nodes
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def render(self, context):
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if self.link_type == IfNode.LinkTypes.or_:
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for ifnot, bool_expr in self.bool_exprs:
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try:
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value = bool_expr.resolve(context)
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@ -179,6 +181,19 @@ class IfNode(Node):
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if (value and not ifnot) or (ifnot and not value):
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return self.nodelist_true.render(context)
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return self.nodelist_false.render(context)
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else:
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for ifnot, bool_expr in self.bool_exprs:
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try:
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value = bool_expr.resolve(context)
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except VariableDoesNotExist:
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value = None
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if not ((value and not ifnot) or (ifnot and not value)):
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return self.nodelist_false.render(context)
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return self.nodelist_true.render(context)
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class LinkTypes:
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and_ = 0,
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or_ = 1
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class RegroupNode(Node):
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def __init__(self, target, expression, var_name):
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@ -561,11 +576,22 @@ def do_if(parser, token):
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if not bits:
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raise TemplateSyntaxError, "'if' statement requires at least one argument"
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# bits now looks something like this: ['a', 'or', 'not', 'b', 'or', 'c.d']
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boolpairs = ' '.join(bits).split(' or ')
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bitstr = ' '.join(bits)
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boolpairs = bitstr.split(' and ')
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boolvars = []
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if len(boolpairs) == 1:
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link_type = IfNode.LinkTypes.or_
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boolpairs = bitstr.split(' or ')
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else:
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link_type = IfNode.LinkTypes.and_
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if ' or ' in bitstr:
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raise TemplateSyntaxError, "'if' tags can't mix 'and' and 'or'"
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for boolpair in boolpairs:
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if ' ' in boolpair:
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try:
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not_, boolvar = boolpair.split()
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except ValueError:
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raise TemplateSyntaxError, "'if' statement improperly formatted"
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if not_ != 'not':
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raise TemplateSyntaxError, "Expected 'not' in if statement"
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boolvars.append((True, parser.compile_filter(boolvar)))
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@ -578,7 +604,7 @@ def do_if(parser, token):
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parser.delete_first_token()
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else:
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nodelist_false = NodeList()
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return IfNode(boolvars, nodelist_true, nodelist_false)
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return IfNode(boolvars, nodelist_true, nodelist_false, link_type)
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do_if = register.tag("if", do_if)
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#@register.tag
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@ -454,8 +454,12 @@ displayed by the ``{{ athlete_list|length }}`` variable.
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As you can see, the ``if`` tag can take an option ``{% else %}`` clause that
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will be displayed if the test fails.
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``if`` tags may use ``or`` or ``not`` to test a number of variables or to negate
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a given variable::
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``if`` tags may use ``and``, ``or`` or ``not`` to test a number of variables or
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to negate a given variable::
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{% if athlete_list and coach_list %}
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Both athletes and coaches are available.
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{% endif %}
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{% if not athlete_list %}
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There are no athletes.
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@ -468,16 +472,24 @@ a given variable::
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{% if not athlete_list or coach_list %}
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There are no athletes or there are some coaches (OK, so
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writing English translations of boolean logic sounds
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stupid; it's not my fault).
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stupid; it's not our fault).
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{% endif %}
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For simplicity, ``if`` tags do not allow ``and`` clauses; use nested ``if``
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tags instead::
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{% if athlete_list and not coach_list %}
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There are some athletes and absolutely no coaches.
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{% endif %}
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``if`` tags don't allow ``and`` and ``or`` clauses within the same tag, because
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the order of logic would be ambiguous. For example, this is invalid::
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{% if athlete_list and coach_list or cheerleader_list %}
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If you need to combine ``and`` and ``or`` to do advanced logic, just use nested
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``if`` tags. For example::
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{% if athlete_list %}
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{% if coach_list %}
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Number of athletes: {{ athlete_list|length }}.
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Number of coaches: {{ coach_list|length }}.
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{% if coach_list or cheerleader_list %}
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We have athletes, and either coaches or cheerleaders!
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{% endif %}
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{% endif %}
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@ -193,13 +193,11 @@ TEMPLATE_TESTS = {
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'exception04': ("{% extends 'inheritance17' %}{% block first %}{% echo 400 %}5678{% endblock %}", {}, template.TemplateSyntaxError),
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### FILTER TAG ############################################################
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#'filterXX': ('', {}, ''),
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'filter01': ('{% filter upper %}{% endfilter %}', {}, ''),
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'filter02': ('{% filter upper %}django{% endfilter %}', {}, 'DJANGO'),
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'filter03': ('{% filter upper|lower %}django{% endfilter %}', {}, 'django'),
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### FIRSTOF TAG ###########################################################
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#'firstofXX': ('', {}, ''),
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'firstof01': ('{% firstof a b c %}', {'a':0,'b':0,'c':0}, ''),
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'firstof02': ('{% firstof a b c %}', {'a':1,'b':0,'c':0}, '1'),
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'firstof03': ('{% firstof a b c %}', {'a':0,'b':2,'c':0}, '2'),
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@ -220,8 +218,79 @@ TEMPLATE_TESTS = {
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'if-tag02': ("{% if foo %}yes{% else %}no{% endif %}", {"foo": False}, "no"),
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'if-tag03': ("{% if foo %}yes{% else %}no{% endif %}", {}, "no"),
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# AND
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'if-tag-and01': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'yes'),
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'if-tag-and02': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'no'),
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'if-tag-and03': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'no'),
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'if-tag-and04': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'no'),
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'if-tag-and05': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'foo': False}, 'no'),
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'if-tag-and06': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'bar': False}, 'no'),
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'if-tag-and07': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'foo': True}, 'no'),
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'if-tag-and08': ("{% if foo and bar %}yes{% else %}no{% endif %}", {'bar': True}, 'no'),
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# OR
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'if-tag-or01': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'yes'),
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'if-tag-or02': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'yes'),
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'if-tag-or03': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'yes'),
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'if-tag-or04': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'no'),
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'if-tag-or05': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'foo': False}, 'no'),
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'if-tag-or06': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'bar': False}, 'no'),
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'if-tag-or07': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'foo': True}, 'yes'),
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'if-tag-or08': ("{% if foo or bar %}yes{% else %}no{% endif %}", {'bar': True}, 'yes'),
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# TODO: multiple ORs
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# NOT
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'if-tag-not01': ("{% if not foo %}no{% else %}yes{% endif %}", {'foo': True}, 'yes'),
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'if-tag-not02': ("{% if not %}yes{% else %}no{% endif %}", {'foo': True}, 'no'),
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'if-tag-not03': ("{% if not %}yes{% else %}no{% endif %}", {'not': True}, 'yes'),
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'if-tag-not04': ("{% if not not %}no{% else %}yes{% endif %}", {'not': True}, 'yes'),
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'if-tag-not05': ("{% if not not %}no{% else %}yes{% endif %}", {}, 'no'),
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'if-tag-not06': ("{% if foo and not bar %}yes{% else %}no{% endif %}", {}, 'no'),
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'if-tag-not07': ("{% if foo and not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'no'),
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'if-tag-not08': ("{% if foo and not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'yes'),
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'if-tag-not09': ("{% if foo and not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'no'),
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'if-tag-not10': ("{% if foo and not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'no'),
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'if-tag-not11': ("{% if not foo and bar %}yes{% else %}no{% endif %}", {}, 'no'),
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'if-tag-not12': ("{% if not foo and bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'no'),
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'if-tag-not13': ("{% if not foo and bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'no'),
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'if-tag-not14': ("{% if not foo and bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'yes'),
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'if-tag-not15': ("{% if not foo and bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'no'),
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'if-tag-not16': ("{% if foo or not bar %}yes{% else %}no{% endif %}", {}, 'yes'),
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'if-tag-not17': ("{% if foo or not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'yes'),
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'if-tag-not18': ("{% if foo or not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'yes'),
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'if-tag-not19': ("{% if foo or not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'no'),
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'if-tag-not20': ("{% if foo or not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'yes'),
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'if-tag-not21': ("{% if not foo or bar %}yes{% else %}no{% endif %}", {}, 'yes'),
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'if-tag-not22': ("{% if not foo or bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'yes'),
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'if-tag-not23': ("{% if not foo or bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'no'),
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'if-tag-not24': ("{% if not foo or bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'yes'),
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'if-tag-not25': ("{% if not foo or bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'yes'),
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'if-tag-not26': ("{% if not foo and not bar %}yes{% else %}no{% endif %}", {}, 'yes'),
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'if-tag-not27': ("{% if not foo and not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'no'),
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'if-tag-not28': ("{% if not foo and not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'no'),
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'if-tag-not29': ("{% if not foo and not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'no'),
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'if-tag-not30': ("{% if not foo and not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'yes'),
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'if-tag-not31': ("{% if not foo or not bar %}yes{% else %}no{% endif %}", {}, 'yes'),
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'if-tag-not32': ("{% if not foo or not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': True}, 'no'),
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'if-tag-not33': ("{% if not foo or not bar %}yes{% else %}no{% endif %}", {'foo': True, 'bar': False}, 'yes'),
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'if-tag-not34': ("{% if not foo or not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': True}, 'yes'),
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'if-tag-not35': ("{% if not foo or not bar %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, 'yes'),
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# AND and OR raises a TemplateSyntaxError
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'if-tag-error01': ("{% if foo or bar and baz %}yes{% else %}no{% endif %}", {'foo': False, 'bar': False}, template.TemplateSyntaxError),
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'if-tag-error02': ("{% if foo and %}yes{% else %}no{% endif %}", {'foo': True}, template.TemplateSyntaxError),
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'if-tag-error03': ("{% if foo or %}yes{% else %}no{% endif %}", {'foo': True}, template.TemplateSyntaxError),
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'if-tag-error04': ("{% if not foo and %}yes{% else %}no{% endif %}", {'foo': True}, template.TemplateSyntaxError),
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'if-tag-error05': ("{% if not foo or %}yes{% else %}no{% endif %}", {'foo': True}, template.TemplateSyntaxError),
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### IFCHANGED TAG #########################################################
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#'ifchangedXX': ('', {}, ''),
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'ifchanged01': ('{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}{% endfor %}', { 'num': (1,2,3) }, '123'),
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'ifchanged02': ('{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}{% endfor %}', { 'num': (1,1,3) }, '13'),
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'ifchanged03': ('{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}{% endfor %}', { 'num': (1,1,1) }, '1'),
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@ -388,7 +457,6 @@ TEMPLATE_TESTS = {
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"""),
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### REGROUP TAG ###########################################################
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#'regroupXX': ('', {}, ''),
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'regroup01': ('{% regroup data by bar as grouped %}' + \
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'{% for group in grouped %}' + \
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'{{ group.grouper }}:' + \
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@ -414,7 +482,6 @@ TEMPLATE_TESTS = {
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{}, ''),
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### TEMPLATETAG TAG #######################################################
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#'templatetagXX': ('', {}, ''),
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'templatetag01': ('{% templatetag openblock %}', {}, '{%'),
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'templatetag02': ('{% templatetag closeblock %}', {}, '%}'),
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'templatetag03': ('{% templatetag openvariable %}', {}, '{{'),
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@ -423,7 +490,6 @@ TEMPLATE_TESTS = {
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'templatetag06': ('{% templatetag foo %}', {}, template.TemplateSyntaxError),
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### WIDTHRATIO TAG ########################################################
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#'widthratioXX': ('', {}, ''),
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'widthratio01': ('{% widthratio a b 0 %}', {'a':50,'b':100}, '0'),
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'widthratio02': ('{% widthratio a b 100 %}', {'a':0,'b':0}, ''),
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'widthratio03': ('{% widthratio a b 100 %}', {'a':0,'b':100}, '0'),
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