def _update_scalar(self, cur, new, path):
if self.delimiter is None or not isinstance(
new, (types.StringTypes, RefValue)):
# either there is no delimiter defined (and hence no references
# are being used), or the new value is not a string (and hence
# cannot be turned into a RefValue), and not a RefValue. We can
# shortcut and just return the new scalar
return new
elif isinstance(new, RefValue):
# the new value is (already) a RefValue, so we need not touch it
# at all
ret = new
else:
# the new value is a string, let's see if it contains references,
# by way of wrapping it in a RefValue and querying the result
ret = RefValue(new, self.delimiter)
if not ret.has_references():
# do not replace with RefValue instance if there are no
# references, i.e. discard the RefValue in ret, just return
# the new value
return new
# So we now have a RefValue. Let's, keep a reference to the instance
# we just created, in a dict indexed by the dictionary path, instead
# of just a list. The keys are required to resolve dependencies during
# interpolation
self._occurrences[path] = ret
return ret
def test_single_subst_end(self):
s = 'I like ' + _var('favcolour')
tv = RefValue(s)
self.assertTrue(tv.has_references())
self.assertEqual(tv.render(CONTEXT),
_poor_mans_template(s, 'favcolour',
CONTEXT['favcolour']))
def _update_scalar(self, cur, new, path):
if self.delimiter is None or not isinstance(new, (types.StringTypes,
RefValue)):
# either there is no delimiter defined (and hence no references
# are being used), or the new value is not a string (and hence
# cannot be turned into a RefValue), and not a RefValue. We can
# shortcut and just return the new scalar
return new
elif isinstance(new, RefValue):
# the new value is (already) a RefValue, so we need not touch it
# at all
ret = new
else:
# the new value is a string, let's see if it contains references,
# by way of wrapping it in a RefValue and querying the result
ret = RefValue(new, self.delimiter)
if not ret.has_references():
# do not replace with RefValue instance if there are no
# references, i.e. discard the RefValue in ret, just return
# the new value
return new
# So we now have a RefValue. Let's, keep a reference to the instance
# we just created, in a dict indexed by the dictionary path, instead
# of just a list. The keys are required to resolve dependencies during
# interpolation
self._occurrences[path] = ret
return ret
def test_single_subst_start(self):
s = _var('favcolour') + ' is my favourite colour'
tv = RefValue(s)
self.assertTrue(tv.has_references())
self.assertEqual(tv.render(CONTEXT),
_poor_mans_template(s, 'favcolour',
CONTEXT['favcolour']))
def test_multiple_subst(self):
greet = PARAMETER_INTERPOLATION_DELIMITER.join(('motd', 'greeting'))
s = _var(greet) + ' I like ' + _var('favcolour') + '!'
tv = RefValue(s)
self.assertTrue(tv.has_references())
want = _poor_mans_template(s, greet, CONTEXT['motd']['greeting'])
want = _poor_mans_template(want, 'favcolour', CONTEXT['favcolour'])
self.assertEqual(tv.render(CONTEXT), want)
def test_deep_subst_solo(self):
var = PARAMETER_INTERPOLATION_DELIMITER.join(('motd', 'greeting'))
s = _var(var)
tv = RefValue(s)
self.assertTrue(tv.has_references())
self.assertEqual(tv.render(CONTEXT),
_poor_mans_template(s, var,
CONTEXT['motd']['greeting']))
def _update_scalar(self, cur, new, path):
if self.delimiter is None or not isinstance(new, types.StringTypes):
return new
else:
ret = RefValue(new, self.delimiter)
if not ret.has_references():
# do not replace with RefValue instance if there are no
# references
return new
# finally, keep a reference to the RefValue instance we just
# created, in a dict indexed by the dictionary path, instead of
# just a list. The keys are required to resolve dependencies
# during interpolation
self._occurrences[path] = ret
return ret
def _update_scalar(self, cur, new, path):
if self.delimiter is None or not isinstance(new, types.StringTypes):
return new
else:
ret = RefValue(new, self.delimiter)
if not ret.has_references():
# do not replace with RefValue instance if there are no
# references
return new
# finally, keep a reference to the RefValue instance we just
# created, in a dict indexed by the dictionary path, instead of
# just a list. The keys are required to resolve dependencies
# during interpolation
self._occurrences[path] = ret
return ret
def _test_solo_ref(self, key):
s = _var(key)
tv = RefValue(s)
res = tv.render(CONTEXT)
self.assertTrue(tv.has_references())
self.assertEqual(res, CONTEXT[key])
def test_simple_string(self):
s = 'my cat likes to hide in boxes'
tv = RefValue(s)
self.assertFalse(tv.has_references())
self.assertEquals(tv.render(CONTEXT), s)
def test_incomplete_variable(self):
s = PARAMETER_INTERPOLATION_SENTINELS[0] + 'incomplete'
with self.assertRaises(IncompleteInterpolationError):
tv = RefValue(s)
def test_undefined_variable(self):
s = _var('no_such_variable')
tv = RefValue(s)
with self.assertRaises(UndefinedVariableError):
tv.render(CONTEXT)
