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import sys
import traceback
class SassError(Exception):
"""Error class that wraps another exception and attempts to bolt on some
useful context.
"""
def __init__(self, exc, rule=None, expression=None):
self.exc = exc
self.rule = rule
self.expression = expression
_, _, self.original_traceback = sys.exc_info()
def set_rule(self, rule):
"""Set the current rule.
If this error already has a rule, it's left alone; this is because
exceptions propagate outwards and so the first rule seen is the
"innermost".
"""
if not self.rule:
self.rule = rule
def format_prefix(self):
# TODO pointer, yadda
# TODO newlines, yadda
if self.rule:
return "Error parsing block:\n" + " " + self.rule.unparsed_contents
else:
return "Unknown error"
def __str__(self):
prefix = self.format_prefix()
ret = [prefix, "\n\n"]
if self.rule:
ret.extend(("From ", self.rule.file_and_line, "\n\n"))
ret.append("Traceback:\n")
ret.extend(traceback.format_tb(self.original_traceback))
ret.extend((type(self.exc).__name__, ": ", str(self.exc), "\n"))
return ''.join(ret)
class SassParseError(SassError):
"""Error raised when parsing a Sass expression fails."""
def format_prefix(self):
# TODO pointer
# TODO deal with newlines, etc
return """Error parsing expression:\n %s""" % (self.expression,)
class SassEvaluationError(SassError):
"""Error raised when evaluating a parsed expression fails."""
def format_prefix(self):
# TODO pointer
# TODO ast needs to know where each node came from for that to work :(
# TODO deal with newlines, etc
return """Error evaluating expression:\n %s""" % (self.expression,)
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