Coverage for pyTooling/Warning/__init__.py: 80%

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8# ==================================================================================================================== # 

9# Authors: # 

10# Patrick Lehmann # 

11# # 

12# License: # 

13# ==================================================================================================================== # 

14# Copyright 2025-2025 Patrick Lehmann - Bötzingen, Germany # 

15# # 

16# Licensed under the Apache License, Version 2.0 (the "License"); # 

17# you may not use this file except in compliance with the License. # 

18# You may obtain a copy of the License at # 

19# # 

20# http://www.apache.org/licenses/LICENSE-2.0 # 

21# # 

22# Unless required by applicable law or agreed to in writing, software # 

23# distributed under the License is distributed on an "AS IS" BASIS, # 

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25# See the License for the specific language governing permissions and # 

26# limitations under the License. # 

27# # 

28# SPDX-License-Identifier: Apache-2.0 # 

29# ==================================================================================================================== # 

30# 

31""" 

32A solution to send warnings like exceptions to a handler in the upper part of the call-stack. 

33 

34.. hint:: See :ref:`high-level help <WARNING>` for explanations and usage examples. 

35""" 

36from sys import version_info 

37from threading import local 

38from types import TracebackType 

39from typing import List, Callable, Optional as Nullable, Type 

40 

41try: 

42 from pyTooling.Decorators import export, readonly 

43 from pyTooling.Common import getFullyQualifiedName 

44 from pyTooling.Exceptions import ExceptionBase 

45except ModuleNotFoundError: # pragma: no cover 

46 print("[pyTooling.Common] Could not import from 'pyTooling.*'!") 

47 

48 try: 

49 from Decorators import export, readonly 

50 from Common import getFullyQualifiedName 

51 from Exceptions import ExceptionBase 

52 except ModuleNotFoundError as ex: # pragma: no cover 

53 print("[pyTooling.Common] Could not import directly!") 

54 raise ex 

55 

56 

57_threadLocalData = local() 

58 

59 

60@export 

61class UnhandledWarningException(ExceptionBase): 

62 pass 

63 

64 

65@export 

66class WarningCollector: 

67 """ 

68 A context manager to collect warnings within the call hierarchy. 

69 """ 

70 _parent: Nullable["WarningCollector"] #: Parent WarningCollector 

71 _warnings: List[Exception] #: List of collected warnings. 

72 _handler: Nullable[Callable[[Exception], bool]] #: Optional handler function, which is called per collected warning. 

73 

74 def __init__(self, warnings: Nullable[List[Exception]] = None, handler: Nullable[Callable[[Exception], bool]] = None) -> None: 

75 """ 

76 Initializes a warning collector. 

77 

78 :param warnings: An optional reference to a list of warnings, which can be modified (appended) by this warning 

79 collector. If ``None``, an internal list is created and can be referenced by the collector's 

80 instance. 

81 :param handler: An optional handler function, which processes the current warning and decides if a warning should 

82 be reraised as an exception. 

83 :raises TypeError: If optional parameter 'warnings' is not of type list. 

84 :raises TypeError: If optional parameter 'handler' is not a callable. 

85 """ 

86 if warnings is None: 

87 warnings = [] 

88 elif not isinstance(warnings, list): 88 ↛ 89line 88 didn't jump to line 89 because the condition on line 88 was never true

89 ex = TypeError(f"Parameter 'warnings' is not list.") 

90 ex.add_note(f"Got type '{getFullyQualifiedName(warnings)}'.") 

91 raise ex 

92 

93 if handler is not None and not isinstance(handler, Callable): 93 ↛ 94line 93 didn't jump to line 94 because the condition on line 93 was never true

94 ex = TypeError(f"Parameter 'handler' is not callable.") 

95 ex.add_note(f"Got type '{getFullyQualifiedName(handler)}'.") 

96 raise ex 

97 

98 self._parent = None 

99 self._warnings = warnings 

100 self._handler = handler 

101 

102 def __enter__(self) -> 'WarningCollector': # -> Self: needs Python 3.11 

103 """ 

104 Enter the warning collector context. 

105 

106 :returns: The warning collector instance. 

107 """ 

108 global _threadLocalData 

109 

110 try: 

111 self.Parent = _threadLocalData.warningCollector 

112 except AttributeError: 

113 pass 

114 

115 _threadLocalData.warningCollector = self 

116 

117 return self 

118 

119 def __exit__( 

120 self, 

121 exc_type: Nullable[Type[BaseException]] = None, 

122 exc_val: Nullable[BaseException] = None, 

123 exc_tb: Nullable[TracebackType] = None 

124 ) -> Nullable[bool]: 

125 """ 

126 Exit the warning collector context. 

127 

128 :param exc_type: Exception type 

129 :param exc_val: Exception instance 

130 :param exc_tb: Exception's traceback. 

131 """ 

132 global _threadLocalData 

133 

134 _threadLocalData.warningCollector = self._parent 

135 

136 @property 

137 def Parent(self) -> Nullable["WarningCollector"]: 

138 return self._parent 

139 

140 @Parent.setter 

141 def Parent(self, value: "WarningCollector") -> None: 

142 self._parent = value 

143 

144 @readonly 

145 def Warnings(self) -> List[Exception]: 

146 """ 

147 Read-only property to access the list of collected warnings. 

148 

149 :returns: A list of collected warnings. 

150 """ 

151 return self._warnings 

152 

153 def AddWarning(self, warning: Exception) -> bool: 

154 """ 

155 Add a warning to the list of warnings managed by this warning collector. 

156 

157 :param warning: The warning to add to the collectors internal warning list. 

158 :returns: Return ``True`` if the warning collector has a local handler callback and this handler returned 

159 ``True``; otherwise ``False``. 

160 :raises ValueError: If parameter ``warning`` is None. 

161 :raises TypeError: If parameter ``warning`` is not of type :class:`Warning`. 

162 """ 

163 if self._warnings is None: 163 ↛ 164line 163 didn't jump to line 164 because the condition on line 163 was never true

164 raise ValueError("Parameter 'warning' is None.") 

165 elif self._warnings is None or not isinstance(warning, Exception): 165 ↛ 166line 165 didn't jump to line 166 because the condition on line 165 was never true

166 ex = TypeError(f"Parameter 'warning' is not of type 'Warning'.") 

167 ex.add_note(f"Got type '{getFullyQualifiedName(warning)}'.") 

168 raise ex 

169 

170 self._warnings.append(warning) 

171 

172 if self._handler is not None: 

173 return self._handler(warning) 

174 

175 return False 

176 

177 @classmethod 

178 def Raise(cls, warning: Exception) -> None: 

179 """ 

180 Walk the callstack frame by frame upwards and search for the first warning collector. 

181 

182 :param warning: Warning to send upwards in the call stack. 

183 :raises Exception: If warning should be converted to an exception. 

184 :raises Exception: If the call-stack walk couldn't find a warning collector. 

185 """ 

186 global _threadLocalData 

187 try: 

188 warningCollector = _threadLocalData.warningCollector 

189 if warningCollector.AddWarning(warning): 

190 raise Exception(f"Warning: {warning}") from warning 

191 except AttributeError: 

192 raise UnhandledWarningException(f"Unhandled warning: {warning}") from warning