| 1 | """ core/error.py """
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| 2 | from __future__ import print_function
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| 3 |
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| 4 | from _devbuild.gen.syntax_asdl import loc_e, loc_t, loc
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| 5 | from _devbuild.gen.value_asdl import (value, value_t, value_str)
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| 6 | from core import num
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| 7 | from mycpp.mylib import NewDict
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| 8 |
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| 9 | from typing import Dict, Union, NoReturn, TYPE_CHECKING
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| 10 |
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| 11 | # For storing errors in List[T]
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| 12 | if TYPE_CHECKING:
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| 13 | IOError_OSError = Union[IOError, OSError]
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| 14 |
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| 15 |
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| 16 | def _ValType(val):
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| 17 | # type: (value_t) -> str
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| 18 | """Duplicate ui.ValType for now"""
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| 19 | return value_str(val.tag(), dot=False)
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| 20 |
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| 21 |
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| 22 | class _ErrorWithLocation(Exception):
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| 23 | """A parse error that can be formatted.
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| 24 |
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| 25 | Formatting is in ui.PrintError.
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| 26 | """
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| 27 |
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| 28 | def __init__(self, msg, location):
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| 29 | # type: (str, loc_t) -> None
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| 30 |
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| 31 | self.msg = msg
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| 32 |
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| 33 | # Ensure that the location field is always populated
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| 34 | if location is None:
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| 35 | self.location = loc.Missing # type: loc_t
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| 36 | else:
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| 37 | self.location = location
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| 38 |
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| 39 | def HasLocation(self):
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| 40 | # type: () -> bool
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| 41 | return self.location.tag() != loc_e.Missing
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| 42 |
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| 43 | def UserErrorString(self):
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| 44 | # type: () -> str
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| 45 | return self.msg
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| 46 |
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| 47 | def __repr__(self):
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| 48 | # type: () -> str
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| 49 | return '<%s %r>' % (self.msg, self.location)
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| 50 |
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| 51 |
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| 52 | class Usage(_ErrorWithLocation):
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| 53 | """For flag parsing errors in builtins and main()
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| 54 |
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| 55 | Called by e_usage(). TODO: Should settle on a single interface that
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| 56 | can be translated. Sometimes we use 'raise error.Usage()'
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| 57 | """
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| 58 |
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| 59 | def __init__(self, msg, location):
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| 60 | # type: (str, loc_t) -> None
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| 61 | _ErrorWithLocation.__init__(self, msg, location)
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| 62 |
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| 63 |
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| 64 | class Parse(_ErrorWithLocation):
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| 65 | """Used in the parsers."""
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| 66 |
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| 67 | def __init__(self, msg, location):
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| 68 | # type: (str, loc_t) -> None
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| 69 | _ErrorWithLocation.__init__(self, msg, location)
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| 70 |
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| 71 |
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| 72 | class FailGlob(_ErrorWithLocation):
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| 73 | """Raised when a glob matches nothing when failglob is set.
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| 74 |
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| 75 | Meant to be caught.
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| 76 | """
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| 77 |
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| 78 | def __init__(self, msg, location):
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| 79 | # type: (str, loc_t) -> None
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| 80 | _ErrorWithLocation.__init__(self, msg, location)
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| 81 |
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| 82 |
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| 83 | class VarSubFailure(_ErrorWithLocation):
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| 84 | """Raised when a variable substitution fails. For example, this
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| 85 | is thrown with ${!ref} when the variable "ref" contains invalid
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| 86 | variable name such as ref="a b c".
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| 87 |
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| 88 | Meant to be caught.
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| 89 | """
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| 90 |
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| 91 | def __init__(self, msg, location):
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| 92 | # type: (str, loc_t) -> None
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| 93 | _ErrorWithLocation.__init__(self, msg, location)
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| 94 |
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| 95 |
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| 96 | class RedirectEval(_ErrorWithLocation):
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| 97 | """Used in the CommandEvaluator.
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| 98 |
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| 99 | A bad redirect causes the SimpleCommand to return with status 1. To
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| 100 | make it fatal, use set -o errexit.
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| 101 | """
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| 102 |
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| 103 | def __init__(self, msg, location):
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| 104 | # type: (str, loc_t) -> None
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| 105 | _ErrorWithLocation.__init__(self, msg, location)
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| 106 |
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| 107 |
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| 108 | class FatalRuntime(_ErrorWithLocation):
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| 109 | """An exception that propagates to the top level.
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| 110 |
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| 111 | Used in the evaluators, and also also used in test builtin for
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| 112 | invalid argument.
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| 113 | """
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| 114 |
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| 115 | def __init__(self, exit_status, msg, location):
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| 116 | # type: (int, str, loc_t) -> None
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| 117 | _ErrorWithLocation.__init__(self, msg, location)
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| 118 | self.exit_status = exit_status
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| 119 |
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| 120 | def ExitStatus(self):
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| 121 | # type: () -> int
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| 122 | return self.exit_status
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| 123 |
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| 124 |
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| 125 | class Strict(FatalRuntime):
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| 126 | """Depending on shell options, these errors may be caught and ignored.
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| 127 |
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| 128 | For example, if options like these are ON:
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| 129 |
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| 130 | set -o strict_arith
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| 131 | set -o strict_word_eval
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| 132 |
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| 133 | then we re-raise the error so it's caught by the top level. Otherwise
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| 134 | we catch it and return a dummy value like '' or -1 (i.e. what bash commonly
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| 135 | does.)
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| 136 |
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| 137 | TODO: Have levels, like:
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| 138 |
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| 139 | OILS_STRICT_PRINT=2 # print warnings at level 2 and above
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| 140 | OILS_STRICT_DIE=1 # abort the program at level 1 and above
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| 141 | """
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| 142 |
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| 143 | def __init__(self, msg, location):
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| 144 | # type: (str, loc_t) -> None
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| 145 | FatalRuntime.__init__(self, 1, msg, location)
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| 146 |
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| 147 |
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| 148 | class ErrExit(FatalRuntime):
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| 149 | """For set -e.
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| 150 |
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| 151 | Travels between WordEvaluator and CommandEvaluator.
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| 152 | """
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| 153 |
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| 154 | def __init__(self, exit_status, msg, location, show_code=False):
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| 155 | # type: (int, str, loc_t, bool) -> None
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| 156 | FatalRuntime.__init__(self, exit_status, msg, location)
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| 157 | self.show_code = show_code
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| 158 |
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| 159 |
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| 160 | class Expr(FatalRuntime):
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| 161 | """e.g. KeyError, IndexError, ZeroDivisionError."""
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| 162 |
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| 163 | def __init__(self, msg, location):
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| 164 | # type: (str, loc_t) -> None
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| 165 |
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| 166 | # Unique status of 3 for expression errors -- for both the caught and
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| 167 | # uncaught case.
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| 168 | #
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| 169 | # Caught: try sets _status register to 3
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| 170 | # Uncaught: shell exits with status 3
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| 171 | FatalRuntime.__init__(self, 3, msg, location)
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| 172 |
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| 173 |
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| 174 | class Structured(FatalRuntime):
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| 175 | """An error that can be exposed via the _error Dict.
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| 176 |
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| 177 | Including:
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| 178 | - Errors raised by the 'error' builtin
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| 179 | - J8 encode and decode errors.
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| 180 | """
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| 181 |
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| 182 | def __init__(self, status, msg, location, properties=None):
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| 183 | # type: (int, str, loc_t, Dict[str, value_t]) -> None
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| 184 | FatalRuntime.__init__(self, status, msg, location)
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| 185 | self.properties = properties
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| 186 |
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| 187 | def ToDict(self):
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| 188 | # type: () -> value.Dict
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| 189 |
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| 190 | d = NewDict() # type: Dict[str, value_t]
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| 191 |
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| 192 | # The _error Dict order is odd -- the optional properties come BEFORE
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| 193 | # required fields. We always want the required fields to be present so
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| 194 | # it makes sense.
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| 195 | if self.properties is not None:
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| 196 | d.update(self.properties)
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| 197 |
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| 198 | # _error.code is better than _error.status
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| 199 | d['code'] = num.ToBig(self.ExitStatus())
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| 200 | d['message'] = value.Str(self.msg)
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| 201 |
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| 202 | return value.Dict(d)
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| 203 |
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| 204 |
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| 205 | class AssertionErr(Expr):
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| 206 | """An assertion."""
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| 207 |
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| 208 | def __init__(self, msg, location):
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| 209 | # type: (str, loc_t) -> None
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| 210 | Expr.__init__(self, msg, location)
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| 211 |
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| 212 |
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| 213 | class TypeErrVerbose(Expr):
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| 214 | """e.g. ~ on a bool or float, 'not' on an int."""
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| 215 |
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| 216 | def __init__(self, msg, location):
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| 217 | # type: (str, loc_t) -> None
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| 218 | Expr.__init__(self, msg, location)
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| 219 |
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| 220 |
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| 221 | class TypeErr(TypeErrVerbose):
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| 222 |
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| 223 | def __init__(self, actual_val, msg, location):
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| 224 | # type: (value_t, str, loc_t) -> None
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| 225 | TypeErrVerbose.__init__(self,
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| 226 | "%s, got %s" % (msg, _ValType(actual_val)),
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| 227 | location)
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| 228 |
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| 229 |
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| 230 | class Runtime(Exception):
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| 231 | """An error that's meant to be caught, i.e. it's non-fatal.
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| 232 |
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| 233 | Thrown by core/state.py and caught by builtins
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| 234 | """
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| 235 |
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| 236 | def __init__(self, msg):
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| 237 | # type: (str) -> None
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| 238 | self.msg = msg
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| 239 |
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| 240 | def UserErrorString(self):
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| 241 | # type: () -> str
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| 242 | return self.msg
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| 243 |
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| 244 |
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| 245 | class Decode(Exception):
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| 246 | """
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| 247 | List of J8 errors:
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| 248 | - message isn't UTF-8 - Id.Lit_Chars - need loc
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| 249 | - Invalid token Id.Unkown_Tok - need loc
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| 250 | - Unclosed double quote string -- need loc
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| 251 | - Parse error, e.g. [}{]
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| 252 |
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| 253 | - Invalid escapes:
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| 254 | - b"" and u"" don't accept \\u1234
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| 255 | - u"" doesn't accept \\yff
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| 256 | - "" doesn't accept \\yff or \\u{123456}
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| 257 | """
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| 258 |
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| 259 | def __init__(self, msg, s, start_pos, end_pos, line_num):
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| 260 | # type: (str, str, int, int, int) -> None
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| 261 | self.msg = msg
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| 262 | self.s = s # string being decoded
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| 263 | self.start_pos = start_pos
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| 264 | self.end_pos = end_pos
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| 265 | self.line_num = line_num
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| 266 |
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| 267 | def Message(self):
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| 268 | # type: () -> str
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| 269 |
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| 270 | # Show 10 chars of context for now
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| 271 | start = max(0, self.start_pos - 4)
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| 272 | end = min(len(self.s), self.end_pos + 4)
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| 273 |
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| 274 | part = self.s[start:end]
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| 275 | return self.msg + ' (line %d, offset %d-%d: %r)' % (
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| 276 | self.line_num, self.start_pos, self.end_pos, part)
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| 277 |
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| 278 | def __str__(self):
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| 279 | # type: () -> str
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| 280 | return self.Message()
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| 281 |
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| 282 |
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| 283 | class Encode(Exception):
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| 284 | """
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| 285 | List of J8 encode errors:
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| 286 | - object cycle
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| 287 | - unprintable object like Eggex
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| 288 | When encoding JSON:
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| 289 | - binary data that can't be represented in JSON
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| 290 | - if using Unicode replacement char, then it won't fail
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| 291 | """
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| 292 |
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| 293 | def __init__(self, msg):
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| 294 | # type: (str) -> None
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| 295 | self.msg = msg
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| 296 |
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| 297 | def Message(self):
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| 298 | # type: () -> str
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| 299 | return self.msg
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| 300 |
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| 301 |
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| 302 | def e_usage(msg, location):
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| 303 | # type: (str, loc_t) -> NoReturn
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| 304 | """Convenience wrapper for arg parsing / validation errors.
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| 305 |
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| 306 | Usually causes a builtin to fail with status 2, but the script can continue
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| 307 | if 'set +o errexit'. Main programs like bin/ysh also use this.
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| 308 |
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| 309 | Caught by
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| 310 |
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| 311 | - RunAssignBuiltin and RunBuiltin, with optional LOCATION INFO
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| 312 | - various main() programs, without location info
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| 313 |
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| 314 | Probably should separate these two cases?
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| 315 |
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| 316 | - builtins pass Token() or loc::Missing()
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| 317 | - tool interfaces don't pass any location info
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| 318 | """
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| 319 | raise Usage(msg, location)
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| 320 |
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| 321 |
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| 322 | def e_strict(msg, location):
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| 323 | # type: (str, loc_t) -> NoReturn
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| 324 | """Convenience wrapper for strictness errors.
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| 325 |
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| 326 | Like e_die(), except the script MAY continue executing after these errors.
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| 327 |
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| 328 | TODO: This could have a level too?
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| 329 | """
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| 330 | raise Strict(msg, location)
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| 331 |
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| 332 |
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| 333 | def p_die(msg, location):
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| 334 | # type: (str, loc_t) -> NoReturn
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| 335 | """Convenience wrapper for parse errors.
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| 336 |
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| 337 | Exits with status 2. See core/main_loop.py.
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| 338 | """
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| 339 | raise Parse(msg, location)
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| 340 |
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| 341 |
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| 342 | def e_die(msg, location=None):
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| 343 | # type: (str, loc_t) -> NoReturn
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| 344 | """Convenience wrapper for fatal runtime errors.
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| 345 |
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| 346 | Usually exits with status 1. See osh/cmd_eval.py.
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| 347 | """
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| 348 | raise FatalRuntime(1, msg, location)
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| 349 |
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| 350 |
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| 351 | def e_die_status(status, msg, location=None):
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| 352 | # type: (int, str, loc_t) -> NoReturn
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| 353 | """Wrapper for C++ semantics.
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| 354 |
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| 355 | Note that it doesn't take positional args, so you should use %
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| 356 | formatting.
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| 357 | """
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| 358 | raise FatalRuntime(status, msg, location)
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