50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
|
|
||
|
|
class XPathError(Exception):
|
||
|
|
"""Base exception class used for all XPath exceptions."""
|
||
|
|
|
||
|
|
class XPathNotImplementedError(XPathError):
|
||
|
|
"""Raised when an XPath expression contains a feature of XPath which
|
||
|
|
has not been implemented.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
class XPathParseError(XPathError):
|
||
|
|
"""Raised when an XPath expression could not be parsed."""
|
||
|
|
|
||
|
|
def __init__(self, expr, pos, message):
|
||
|
|
XPathError.__init__(self)
|
||
|
|
self.expr = expr
|
||
|
|
self.pos = pos
|
||
|
|
self.err = message
|
||
|
|
|
||
|
|
def __str__(self):
|
||
|
|
return ("Syntax error:\n" +
|
||
|
|
self.expr.replace("\n", " ") + "\n" +
|
||
|
|
("-" * self.pos) + "^")
|
||
|
|
|
||
|
|
class XPathTypeError(XPathError):
|
||
|
|
"""Raised when an XPath expression is found to contain a type error.
|
||
|
|
For example, the expression "string()/node()" contains a type error
|
||
|
|
because the "string()" function does not return a node-set.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
class XPathUnknownFunctionError(XPathError):
|
||
|
|
"""Raised when an XPath expression contains a function that has no
|
||
|
|
binding in the expression context.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
class XPathUnknownPrefixError(XPathError):
|
||
|
|
"""Raised when an XPath expression contains a QName with a namespace
|
||
|
|
prefix that has no corresponding namespace declaration in the expression
|
||
|
|
context.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
class XPathUnknownVariableError(XPathError):
|
||
|
|
"""Raised when an XPath expression contains a variable that has no
|
||
|
|
binding in the expression context.
|
||
|
|
|
||
|
|
"""
|