Hide keyboard shortcuts

Hot-keys on this page

r m x p   toggle line displays

j k   next/prev highlighted chunk

0   (zero) top of page

1   (one) first highlighted chunk

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

# This file is part of pex_exceptions. 

# 

# Developed for the LSST Data Management System. 

# This product includes software developed by the LSST Project 

# (https://www.lsst.org). 

# See the COPYRIGHT file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the GNU General Public License 

# along with this program. If not, see <https://www.gnu.org/licenses/>. 

 

__all__ = ["register", "ExceptionMeta", "Exception", "LogicError", 

"DomainError", "InvalidParameterError", "LengthError", 

"OutOfRangeError", "RuntimeError", "RangeError", "OverflowError", 

"UnderflowError", "NotFoundError", "IoError", "TypeError", 

"translate", "declare"] 

 

import warnings 

import builtins 

 

from . import exceptions 

 

registry = {} 

 

 

def register(cls): 

"""A Python decorator that adds a Python exception wrapper to the registry that maps C++ Exceptions 

to their Python wrapper classes. 

""" 

registry[cls.WrappedClass] = cls 

return cls 

 

 

class ExceptionMeta(type): 

"""A metaclass for custom exception wrappers, which adds lookup of class attributes 

by delegating to the Swig-generated wrapper. 

""" 

 

def __getattr__(cls, name): 

return getattr(cls.WrappedClass, name) 

 

 

@register 

class Exception(builtins.Exception, metaclass=ExceptionMeta): 

"""The base class for Python-wrapped LSST C++ exceptions. 

""" 

 

# wrappers.py is an implementation detail, not a public namespace, so we pretend this is defined 

# in the package for pretty-printing purposes 

__module__ = "lsst.pex.exceptions" 

 

WrappedClass = exceptions.Exception 

 

def __init__(self, arg, *args, **kwds): 

if isinstance(arg, exceptions.Exception): 

cpp = arg 

message = cpp.what() 

else: 

message = arg 

cpp = self.WrappedClass(message, *args, **kwds) 

super(Exception, self).__init__(message) 

self.cpp = cpp 

 

def __getattr__(self, name): 

return getattr(self.cpp, name) 

 

def __repr__(self): 

return "%s('%s')" % (type(self).__name__, self.cpp.what()) 

 

def __str__(self): 

return self.cpp.asString() 

 

 

@register 

class LogicError(Exception): 

WrappedClass = exceptions.LogicError 

 

 

@register 

class DomainError(LogicError): 

WrappedClass = exceptions.DomainError 

 

 

@register 

class InvalidParameterError(LogicError): 

WrappedClass = exceptions.InvalidParameterError 

 

 

@register 

class LengthError(LogicError): 

WrappedClass = exceptions.LengthError 

 

 

@register 

class OutOfRangeError(LogicError): 

WrappedClass = exceptions.OutOfRangeError 

 

 

@register 

class RuntimeError(Exception, builtins.RuntimeError): 

WrappedClass = exceptions.RuntimeError 

 

 

@register 

class RangeError(RuntimeError): 

WrappedClass = exceptions.RangeError 

 

 

@register 

class OverflowError(RuntimeError, builtins.OverflowError): 

WrappedClass = exceptions.OverflowError 

 

 

@register 

class UnderflowError(RuntimeError, builtins.ArithmeticError): 

WrappedClass = exceptions.UnderflowError 

 

 

@register 

class NotFoundError(Exception, builtins.LookupError): 

WrappedClass = exceptions.NotFoundError 

 

 

@register 

class IoError(RuntimeError, builtins.IOError): 

WrappedClass = exceptions.IoError 

 

 

@register 

class TypeError(LogicError, builtins.TypeError): 

WrappedClass = exceptions.TypeError 

 

 

def translate(cpp): 

"""Translate a C++ Exception instance to Python and return it.""" 

PyType = registry.get(type(cpp), None) 

if PyType is None: 

warnings.warn("Could not find appropriate Python type for C++ Exception") 

PyType = Exception 

return PyType(cpp) 

 

 

def declare(module, exception_name, base, wrapped_class): 

"""Declare a new exception.""" 

setattr(module, exception_name, register(ExceptionMeta(exception_name, (base, ), 

dict(WrappedClass=wrapped_class))))