def if_(condition, if_true, if_false=''):
condition = bool(
False if not condition or isinstance(condition, six.string_types) and
(condition in ('0', 'false', 'undefined'
) or _variable_re.match(condition)) else condition)
return if_true.__class__(if_true) if condition else if_true.__class__(
if_false)
def evaluate_expression(self, expr, divide=False):
if not isinstance(expr, six.string_types):
raise TypeError("Expected string, got %r" % (expr, ))
if expr in ast_cache:
ast = ast_cache[expr]
elif _variable_re.match(expr):
# Short-circuit for variable names
ast = Variable(expr)
else:
try:
P = SassExpression(SassExpressionScanner())
P.reset(expr)
ast = P.goal()
except SyntaxError:
if config.DEBUG:
raise
return None
except Exception:
# TODO hoist me up since the rule is gone
#log.exception("Exception raised: %s in `%s' (%s)", e, expr, rule.file_and_line)
if config.DEBUG:
raise
return None
else:
ast_cache[expr] = ast
return ast.evaluate(self, divide=divide)
def _type_of(obj): # -> bool, number, string, color, list
if isinstance(obj, BooleanValue):
return StringValue('bool')
if isinstance(obj, NumberValue):
return StringValue('number')
if isinstance(obj, ColorValue):
return StringValue('color')
if isinstance(obj, ListValue):
return StringValue('list')
if isinstance(obj, basestring) and _variable_re.match(obj):
return StringValue('undefined')
return StringValue('string')
def eval_expr(expr, rule, library, raw=False):
# print >>sys.stderr, '>>',expr,'<<'
results = None
if not isinstance(expr, basestring):
results = expr
if results is None:
if _variable_re.match(expr):
expr = normalize_var(expr)
if expr in rule.context:
chkd = {}
while expr in rule.context and expr not in chkd:
chkd[expr] = 1
_expr = rule.context[expr]
if _expr == expr:
break
expr = _expr
if not isinstance(expr, basestring):
results = expr
if results is None:
if expr in expr_cache:
results = expr_cache[expr]
else:
try:
P = Calculator(CalculatorScanner(), library)
P.reset(expr)
results = P.goal(rule)
except SyntaxError:
if config.DEBUG:
raise
except Exception, e:
log.exception("Exception raised: %s in `%s' (%s)", e, expr, rule.file_and_line)
if config.DEBUG:
raise
# TODO this is a clumsy hack for nondeterministic functions;
# something better (and per-compiler rather than global) would be
# nice
if '$' not in expr and '(' not in expr:
expr_cache[expr] = results
def if_(condition, if_true, if_false=''):
condition = bool(False if not condition or isinstance(condition, six.string_types) and (condition in ('0', 'false', 'undefined') or _variable_re.match(condition)) else condition)
return if_true.__class__(if_true) if condition else if_true.__class__(if_false)
