How to use the mako.exceptions.CompileException function in Mako

undeclared_identifiers.union(
                                code.undeclared_identifiers)
                        expr.append('(%s)' % m.group(1))
                    else:
                        if x:
                            expr.append(repr(x))
                self.parsed_attributes[key] = " + ".join(expr) or repr('')
            elif key in nonexpressions:
                if re.search(r'\${.+?}', self.attributes[key]):
                    raise exceptions.CompileException(
                        "Attibute '%s' in tag '%s' does not allow embedded "
                        "expressions" % (key, self.keyword),
                        **self.exception_kwargs)
                self.parsed_attributes[key] = repr(self.attributes[key])
            else:
                raise exceptions.CompileException(
                    "Invalid attribute for tag '%s': '%s'" %
                    (self.keyword, key),
                    **self.exception_kwargs)
        self.expression_undeclared_identifiers = undeclared_identifiers

def visitDefOrBase(s, node):
                        if node.is_anonymous:
                            raise exceptions.CompileException(
                                "Can't put anonymous blocks inside "
                                "<%namespace>",
                                **node.exception_kwargs
                            )
                        self.write_inline_def(node, identifiers, nested=False)
                        export.append(node.funcname)
                vis = NSDefVisitor()

**self.exception_kwargs)
                        # we aren't discarding "declared_identifiers" here,
                        # which we do so that list comprehension-declared
                        # variables aren't counted.   As yet can't find a
                        # condition that requires it here.
                        undeclared_identifiers = \
                            undeclared_identifiers.union(
                                    code.undeclared_identifiers)
                        expr.append('(%s)' % m.group(1))
                    else:
                        if x:
                            expr.append(repr(x))
                self.parsed_attributes[key] = " + ".join(expr) or repr('')
            elif key in nonexpressions:
                if re.search(r'\${.+?}', self.attributes[key]):
                    raise exceptions.CompileException(
                           "Attibute '%s' in tag '%s' does not allow embedded "
                           "expressions"  % (key, self.keyword),
                           **self.exception_kwargs)
                self.parsed_attributes[key] = repr(self.attributes[key])
            else:
                raise exceptions.CompileException(
                                    "Invalid attribute for tag '%s': '%s'" %
                                    (self.keyword, key),
                                    **self.exception_kwargs)
        self.expression_undeclared_identifiers = undeclared_identifiers

def __init__(self, keyword, attributes, **kwargs):
        super(NamespaceTag, self).__init__(
            keyword, attributes,
            ('file',),
            ('name', 'inheritable',
             'import', 'module'),
            (), **kwargs)

        self.name = attributes.get('name', '__anon_%s' % hex(abs(id(self))))
        if 'name' not in attributes and 'import' not in attributes:
            raise exceptions.CompileException(
                "'name' and/or 'import' attributes are required "
                "for <%namespace>",
                **self.exception_kwargs)
        if 'file' in attributes and 'module' in attributes:
            raise exceptions.CompileException(
                "<%namespace> may only have one of 'file' or 'module'",
                **self.exception_kwargs
            )

def _check_name_exists(self, collection, node):
        existing = collection.get(node.funcname)
        collection[node.funcname] = node
        if existing is not None and \
            existing is not node and \
            (node.is_block or existing.is_block):
            raise exceptions.CompileException(
                    "%%def or %%block named '%s' already "
                    "exists in this template." %
                    node.funcname, **node.exception_kwargs)

def __init__(self, keyword, attributes, **kwargs):
        super(NamespaceTag, self).__init__(
            keyword,
            attributes,
            ("file",),
            ("name", "inheritable", "import", "module"),
            (),
            **kwargs
        )

        self.name = attributes.get("name", "__anon_%s" % hex(abs(id(self))))
        if "name" not in attributes and "import" not in attributes:
            raise exceptions.CompileException(
                "'name' and/or 'import' attributes are required "
                "for <%namespace>",
                **self.exception_kwargs
            )
        if "file" in attributes and "module" in attributes:
            raise exceptions.CompileException(
                "<%namespace> may only have one of 'file' or 'module'",
                **self.exception_kwargs
            )

"Found utf-8 BOM in file, with conflicting "
                                "magic encoding comment of '%s'" % m.group(1), 
                                text.decode('utf-8', 'ignore'), 
                                0, 0, filename)
        else:
            m = self._coding_re.match(text.decode('utf-8', 'ignore'))
            if m:
                parsed_encoding = m.group(1)
            else:
                parsed_encoding = known_encoding or 'ascii'

        if decode_raw:
            try:
                text = text.decode(parsed_encoding)
            except UnicodeDecodeError, e:
                raise exceptions.CompileException(
                                "Unicode decode operation of encoding '%s' failed" %
                                parsed_encoding, 
                                text.decode('utf-8', 'ignore'), 
                                0, 0, filename)

        return parsed_encoding, text

def visitDefOrBase(s, node):
                        if node.is_anonymous:
                            raise exceptions.CompileException(
                                "Can't put anonymous blocks inside "
                                "<%namespace>",
                                **node.exception_kwargs
                            )
                        self.write_inline_def(node, identifiers, nested=False)
                        export.append(node.funcname)