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# -*- coding: utf-8 -*- 

 

u'''Errors, exceptions and exception chaining. 

 

Error, exception classes and functions to format PyGeodesy errors, 

including the setting of I{exception chaining} in Python 3+. 

 

By default, I{exception chaining} is turned I{off}. To enable 

I{exception chaining}, use command line option C{python -X dev} 

I{OR} set env var C{PYTHONDEVMODE} to C{1} or any non-empyty 

string I{OR} set env var C{PYGEODESY_EXCEPTION_CHAINING=std} 

or any other non-empty string. 

''' 

from pygeodesy.interns import MISSING, NN, _a_,_an_, _and_, \ 

_COLON_, _COMMA_, _COMMASPACE_, \ 

_datum_, _ellipsoidal_, _EQUAL_, \ 

_incompatible_, _invalid_, _len_, \ 

_name_, _no_, _not_, _or_, _SPACE_, \ 

_specified_, _UNDER_, _value_ 

from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS, \ 

_getenv, _PYTHON_X_DEV 

 

__all__ = _ALL_LAZY.errors # _ALL_DOCS('_InvalidError', '_IsnotError') 

__version__ = '22.04.09' 

 

_default_ = 'default' 

_kwargs_ = 'kwargs' 

_limiterrors = True # imported by .formy 

_multiple_ = 'multiple' 

_name_value_ = repr('name=value') 

_rangerrors = True # imported by .dms 

__vs__ = ' vs ' # _vsSPACED_ 

_with_ = 'with' 

 

try: 

_exception_chaining = None # not available 

_ = Exception().__cause__ # Python 3+ exception chaining 

 

if _PYTHON_X_DEV or _getenv('PYGEODESY_EXCEPTION_CHAINING', NN): # == _std_ 

_exception_chaining = True # turned on, std 

raise AttributeError # allow exception chaining 

 

_exception_chaining = False # turned off 

 

def _error_chain(inst, other=None): 

'''(INTERNAL) Set or avoid Python 3+ exception chaining. 

 

Setting C{inst.__cause__ = None} is equivalent to syntax 

C{raise Error(...) from None} to avoid exception chaining. 

 

@arg inst: An error instance (C{Exception}). 

@kwarg other: The previous error instance (C{Exception}) or 

C{None} to avoid exception chaining. 

 

@see: Alex Martelli, et.al., "Python in a Nutshell", 3rd Ed., page 163, 

O'Reilly, 2017, U{PEP-3134<https://www.Python.org/dev/peps/pep-3134>}, 

U{here <https://StackOverflow.com/questions/17091520/how-can-i-more- 

easily-suppress-previous-exceptions-when-i-raise-my-own-exception>} 

and U{here<https://StackOverflow.com/questions/1350671/ 

inner-exception-with-traceback-in-python>}. 

''' 

inst.__cause__ = other # None, no exception chaining 

return inst 

 

except AttributeError: # Python 2+ 

 

def _error_chain(inst, **unused): # PYCHOK expected 

return inst # no-op 

 

 

class _AssertionError(AssertionError): 

'''(INTERNAL) Format an C{AssertionError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(AssertionError, self, name_value, **txt_name_values) 

 

 

class _AttributeError(AttributeError): 

'''(INTERNAL) Format an C{AttributeError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(AttributeError, self, name_value, **txt_name_values) 

 

 

class _ImportError(ImportError): 

'''(INTERNAL) Format an C{ImportError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(ImportError, self, name_value, **txt_name_values) 

 

 

class _IndexError(IndexError): 

'''(INTERNAL) Format an C{IndexError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(IndexError, self, name_value, **txt_name_values) 

 

 

class _NameError(NameError): 

'''(INTERNAL) Format a C{NameError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(NameError, self, name_value, **txt_name_values) 

 

 

class _NotImplementedError(NotImplementedError): 

'''(INTERNAL) Format a C{NotImplementedError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(NotImplementedError, self, name_value, **txt_name_values) 

 

 

class _OverflowError(OverflowError): 

'''(INTERNAL) Format an C{OverflowError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # txt=_invalid_ 

_error_init(OverflowError, self, name_value, **txt_name_values) 

 

 

class _TypeError(TypeError): 

'''(INTERNAL) Format a C{TypeError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): 

_error_init(TypeError, self, name_value, fmt_name_value='type(%s) (%r)', 

**txt_name_values) 

 

 

class _TypesError(_TypeError): 

'''(INTERNAL) Format a C{TypeError} without exception chaining. 

''' 

def __init__(self, name, value, *Types): 

t = _not_(_an(_or(*(t.__name__ for t in Types)))) 

_TypeError.__init__(self, name, value, txt=t) 

 

 

class _ValueError(ValueError): 

'''(INTERNAL) Format a C{ValueError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # name, value, txt=_invalid_ 

_error_init(ValueError, self, name_value, **txt_name_values) 

 

 

class _ZeroDivisionError(ZeroDivisionError): 

'''(INTERNAL) Format a C{ZeroDivisionError} without exception chaining. 

''' 

def __init__(self, *name_value, **txt_name_values): # name, value, txt=_invalid_ 

_error_init(ZeroDivisionError, self, name_value, **txt_name_values) 

 

 

class CrossError(_ValueError): 

'''Error raised for zero or near-zero vectorial cross products, 

occurring for coincident or colinear points, paths or bearings. 

''' 

pass 

 

 

class IntersectionError(_ValueError): # in .ellipsoidalBaseDI, .formy, ... 

'''Error raised for path or circle intersection issues. 

''' 

def __init__(self, *args, **kwds): # txt=_invalid_ 

'''New L{IntersectionError}. 

''' 

if args: 

_ValueError.__init__(self, _SPACE_(*args), **kwds) 

else: 

_ValueError.__init__(self, **kwds) 

 

 

class LenError(_ValueError): # in .ecef, .fmath, .heights, .iters, .named 

'''Error raised for mis-matching C{len} values. 

''' 

def __init__(self, where, **lens_txt): # txt=None 

'''New L{LenError}. 

 

@arg where: Object with C{.__name__} attribute 

(C{class}, C{method}, or C{function}). 

@kwarg lens_txt: Two or more C{name=len(name)} pairs 

(C{keyword arguments}). 

''' 

PAREN = _MODS.streprs.Fmt.PAREN 

x = _xkwds_pop(lens_txt, txt=_invalid_) 

ns, vs = zip(*sorted(lens_txt.items())) 

ns = _COMMASPACE_.join(ns) 

vs = __vs__.join(map(str, vs)) 

t = _SPACE_(PAREN(where.__name__, ns), _len_, vs) 

_ValueError.__init__(self, t, txt=x) 

 

 

class LimitError(_ValueError): 

'''Error raised for lat- or longitudinal deltas exceeding 

the B{C{limit}} in functions L{pygeodesy.equirectangular} and 

L{pygeodesy.equirectangular_} and several C{nearestOn*} and 

C{simplify*} functions or methods. 

''' 

pass 

 

 

class NumPyError(_ValueError): 

'''Error raised for C{NumPy} errors. 

''' 

pass 

 

 

class ParseError(_ValueError): # in .dms, .elevations, .utmupsBase 

'''Error parsing degrees, radians or several other formats. 

''' 

pass 

 

 

class PointsError(_ValueError): # in .clipy, .frechet, ... 

'''Error for an insufficient number of points. 

''' 

pass 

 

 

class RangeError(_ValueError): # in .dms, .ellipsoidalBase, .geoids, .units, .ups, .utm, .utmups 

'''Error raised for lat- or longitude values outside the B{C{clip}}, B{C{clipLat}}, 

B{C{clipLon}} or B{C{limit}} range in function L{pygeodesy.clipDegrees}, 

L{pygeodesy.clipRadians}, L{pygeodesy.parse3llh}, L{pygeodesy.parseDMS}, 

L{pygeodesy.parseDMS2} or L{pygeodesy.parseRad}. 

 

@see: Function L{pygeodesy.rangerrors}. 

''' 

pass 

 

 

class TriangleError(_ValueError): # in .resections, .vector2d 

'''Error raised for triangle, inter- or resection issues. 

''' 

pass 

 

 

class SciPyError(PointsError): 

'''Error raised for C{SciPy} errors. 

''' 

pass 

 

 

class SciPyWarning(PointsError): 

'''Error thrown for C{SciPy} warnings. 

 

To raise C{SciPy} warnings as L{SciPyWarning} exceptions, Python 

C{warnings} must be filtered as U{warnings.filterwarnings('error') 

<https://docs.Python.org/3/library/warnings.html#the-warnings-filter>} 

I{prior to} C{import scipy} OR by setting env var U{PYTHONWARNINGS 

<https://docs.Python.org/3/using/cmdline.html#envvar-PYTHONWARNINGS>} 

OR by invoking C{python} with command line option U{-W<https://docs. 

Python.org/3/using/cmdline.html#cmdoption-w>} set to C{-W error}. 

''' 

pass 

 

 

class TRFError(_ValueError): # in .ellipsoidalBase, .trf, .units 

'''Terrestrial Reference Frame (TRF), L{Epoch}, L{RefFrame} 

or L{RefFrame} conversion issue. 

''' 

pass 

 

 

class UnitError(_ValueError): # in .named, .units 

'''Default exception for L{units} issues. 

''' 

pass 

 

 

class VectorError(_ValueError): # in .nvectorBase, .vector3d, .vector3dBase 

'''L{Vector3d}, C{Cartesian*} or C{*Nvector} issues. 

''' 

pass 

 

 

def _an(noun): 

'''(INTERNAL) Prepend an article to a noun based 

on the pronounciation of the first letter. 

''' 

a = _an_ if noun[:1].lower() in 'aeinoux' else _a_ 

return _SPACE_(a, noun) 

 

 

def _and(*words): 

'''(INTERNAL) Join C{words} with C{", "} and C{" and "}. 

''' 

return _and_or(_and_, *words) 

 

 

def _and_or(last, *words): 

'''(INTERNAL) Join C{words} with C{", "} and C{B{last}}. 

''' 

t, w = NN, list(words) 

if w: 

t = w.pop() 

if w: 

w = _COMMASPACE_.join(w) 

t = _SPACE_(w, last, t) 

return t 

 

 

def crosserrors(raiser=None): 

'''Report or ignore vectorial cross product errors. 

 

@kwarg raiser: Use C{True} to throw or C{False} to ignore 

L{CrossError} exceptions. Use C{None} to 

leave the setting unchanged. 

 

@return: Previous setting (C{bool}). 

 

@see: Property C{Vector3d[Base].crosserrors}. 

''' 

B = _MODS.vector3dBase.Vector3dBase 

t = B._crosserrors # XXX class attr! 

if raiser in (True, False): 

B._crosserrors = raiser 

return t 

 

 

def _error_init(Error, inst, name_value, fmt_name_value='%s (%r)', 

txt=_invalid_, **name_values): # by .lazily 

'''(INTERNAL) Format an error text and initialize an C{Error} instance. 

 

@arg Error: The error super-class (C{Exception}). 

@arg inst: Sub-class instance to be initialized (C{_Exception}). 

@arg name_value: Either just a value or several name, value, ... 

positional arguments (C{str}, any C{type}), in 

particular for name conflicts with keyword 

arguments of C{error_init} or which can't be 

used as C{name=value} keyword arguments. 

@kwarg fmt_name_value: Format for (name, value) (C{str}). 

@kwarg txt: Optional explanation of the error (C{str}). 

@kwarg name_values: One or more C{B{name}=value} pairs overriding 

any B{C{name_value}} positional arguments. 

''' 

if name_values: 

t = _or(*sorted(fmt_name_value % t for t in name_values.items())) 

elif len(name_value) > 1: 

t = _or(*sorted(fmt_name_value % t for t in zip(name_value[0::2], 

name_value[1::2]))) 

elif name_value: 

t = str(name_value[0]) 

else: 

t = _SPACE_(_name_value_, str(MISSING)) 

 

if txt is not None: 

c = _COMMA_ if _COLON_ in t else _COLON_ 

x = str(txt) or _invalid_ 

t = NN(t, c, _SPACE_, x) 

# else: 

# x = NN # XXX or t? 

Error.__init__(inst, t) 

# inst.__x_txt__ = x # hold explanation 

_error_chain(inst) # no Python 3+ exception chaining 

_error_under(inst) 

 

 

def _error_under(inst): 

'''(INTERNAL) Remove leading underscore from instance' class name. 

''' 

n = inst.__class__.__name__ 

if n.startswith(_UNDER_): 

inst.__class__.__name__ = n.lstrip(_UNDER_) 

return inst 

 

 

def exception_chaining(error=None): 

'''Get the previous exception's or exception chaining setting. 

 

@kwarg error: An error instance (C{Exception}) or C{None}. 

 

@return: If C{B{error} is None}, return C{True} if exception 

chaining is enabled for PyGeodesy errors, C{False} 

if turned off and C{None} if not available. If 

B{C{error}} is not C{None}, return the previous, 

chained error or C{None} otherwise. 

 

@note: Set env var C{PYGEODESY_EXCEPTION_CHAINING} to any 

non-empty value prior to C{import pygeodesy} to 

enable exception chaining for C{pygeodesy} errors. 

''' 

return _exception_chaining if error is None else \ 

getattr(error, '__cause__', None) 

 

 

def _incompatible(this): 

'''(INTERNAL) Format an incompatible text. 

''' 

return _SPACE_(_incompatible_, _with_, this) 

 

 

def _InvalidError(Error=_ValueError, **txt_name_values): # txt=_invalid_, name=value [, ...] 

'''(INTERNAL) Create an C{Error} instance. 

 

@kwarg Error: The error class or sub-class (C{Exception}). 

@kwarg txt_name_values: One or more C{B{name}=value} pairs 

and optionally, a C{B{txt}=...} 

keyword argument to override the 

default C{B{txt}='invalid'} 

 

@return: An B{C{Error}} instance. 

''' 

try: 

e = Error(**txt_name_values) 

except TypeError: # std *Error takes no keyword arguments 

e = _ValueError(**txt_name_values) 

e = Error(str(e)) 

_error_chain(e) 

_error_under(e) 

return e 

 

 

def _IsnotError(*nouns, **name_value_Error): # name=value [, Error=TypeError] 

'''Create a C{TypeError} for an invalid C{name=value} type. 

 

@arg nouns: One or more expected class or type names, 

usually nouns (C{str}). 

@kwarg name_value_Error: One C{B{name}=value} pair and 

optionally, an C{B{Error}=...} 

keyword argument to override 

the default C{B{Error}=TypeError}. 

 

@return: A C{TypeError} or an B{C{Error}} instance. 

''' 

Error = _xkwds_pop(name_value_Error, Error=TypeError) 

n, v = _xkwds_popitem(name_value_Error) if name_value_Error else ( 

_name_value_, MISSING) # XXX else tuple(...) 

v = _MODS.streprs.Fmt.PAREN(repr(v)) 

t = _or(*nouns) or _specified_ 

if len(nouns) > 1: 

t = _an(t) 

e = Error(_SPACE_(n, v, _not_, t)) 

_error_chain(e) 

_error_under(e) 

return e 

 

 

def limiterrors(raiser=None): 

'''Get/set the throwing of L{LimitError}s. 

 

@kwarg raiser: Choose C{True} to raise or C{False} to 

ignore L{LimitError} exceptions. Use 

C{None} to leave the setting unchanged. 

 

@return: Previous setting (C{bool}). 

''' 

global _limiterrors 

t = _limiterrors 

if raiser in (True, False): 

_limiterrors = raiser 

return t 

 

 

def _or(*words): 

'''(INTERNAL) Join C{words} with C{", "} and C{" or "}. 

''' 

return _and_or(_or_, *words) 

 

 

def _parseX(parser, *args, **name_values_Error): # name=value[, ..., Error=ParseError] 

'''(INTERNAL) Invoke a parser and handle exceptions. 

 

@arg parser: The parser (C{callable}). 

@arg args: Any parser positional arguments (any C{type}s). 

@kwarg name_values_Error: One or more C{B{name}=value} pairs 

and optionally, an C{B{Error}=...} 

keyword argument to override the 

default C{B{Error}=ParseError}. 

 

@return: Parser result. 

 

@raise ParseError: Or the specified C{B{Error}=...}. 

 

@raise RangeError: If that error occurred. 

''' 

try: 

return parser(*args) 

 

except RangeError as x: 

E, t = type(x), str(x) 

except (AttributeError, IndexError, TypeError, ValueError) as x: 

E, t = ParseError, str(x) 

raise _InvalidError(**_xkwds(name_values_Error, Error=E, txt=t)) 

 

 

def rangerrors(raiser=None): 

'''Get/set the throwing of L{RangeError}s. 

 

@kwarg raiser: Choose C{True} to raise or C{False} to ignore 

L{RangeError} exceptions. Use C{None} to leave 

the setting unchanged. 

 

@return: Previous setting (C{bool}). 

''' 

global _rangerrors 

t = _rangerrors 

if raiser in (True, False): 

_rangerrors = raiser 

return t 

 

 

def _SciPyIssue(x, *extras): # PYCHOK no cover 

if isinstance(x, (RuntimeWarning, UserWarning)): 

X = SciPyWarning 

else: 

X = SciPyError # PYCHOK not really 

t = _SPACE_(str(x).strip(), *extras) 

return _error_chain(X(t), other=x) 

 

 

def _xdatum(datum1, datum2, Error=None): 

'''(INTERNAL) Check for datum or ellipsoid mis-match. 

''' 

if Error: 

E1, E2 = datum1.ellipsoid, datum2.ellipsoid 

if E1 != E2: 

raise Error(E2.named2, txt=_incompatible(E1.named2)) 

elif datum1 != datum2: 

t = _SPACE_(_datum_, repr(datum1.name), _not_, repr(datum2.name)) 

raise _AssertionError(t) 

 

 

def _xellipsoidal(**name_value): 

'''(INTERNAL) Check an I{ellipsoidal} item. 

 

@return: The B{C{value}} if ellipsoidal. 

 

@raise TypeError: Not ellipsoidal B{C{value}}. 

''' 

try: 

for n, v in name_value.items(): 

if v.isEllipsoidal: 

return v 

break 

else: 

n = v = MISSING 

except AttributeError: 

pass 

raise _TypeError(n, v, txt=_not_(_ellipsoidal_)) 

 

 

# map certain C{Exception} classes to the C{_Error} 

_X2Error = {AssertionError: _AssertionError, 

AttributeError: _AttributeError, 

ImportError: _ImportError, 

IndexError: _IndexError, 

NameError: _NameError, 

NotImplementedError: _NotImplementedError, 

OverflowError: _OverflowError, 

TypeError: _TypeError, 

ValueError: _ValueError, 

ZeroDivisionError: _ZeroDivisionError} 

_xErrors = _TypeError, _TypeError, _ValueError 

 

 

def _xError(x, *args, **kwds): 

'''(INTERNAL) Embellish an exception. 

 

@arg x: The exception instance (usually, C{_Error}). 

@arg args: Embelishments (C{any}). 

@arg kwds: Embelishments (C{any}). 

''' 

X = x.__class__ 

t = str(x) 

try: # C{_Error} style 

return X(txt=t, *args, **kwds) 

except TypeError: # no keyword arguments 

pass 

# not an C{_Error}, format as C{_Error} 

t = str(_ValueError(txt=t, *args, **kwds)) 

return x if _exception_chaining else X(t) 

 

 

def _xError2(x): # in .fsums 

'''(INTERNAL) Map an exception to 2-tuple (C{_Error} class, error C{txt}). 

 

@arg x: The exception instance (usually, C{Exception}). 

''' 

X = x.__class__ 

E = _X2Error.get(X, X) 

if E is X and not isinstance(x, _xErrors): 

E = _NotImplementedError 

t = repr(x) 

else: 

t = str(x) 

return E, t 

 

 

try: 

_ = {}.__or__ # {} | {} # Python 3.9+ 

 

def _xkwds(kwds, **dflts): 

'''(INTERNAL) Override C{dflts} with specified C{kwds}. 

''' 

return (dflts | kwds) if kwds else dflts 

 

except AttributeError: 

 

from copy import copy as _copy 

 

def _xkwds(kwds, **dflts): # PYCHOK expected 

'''(INTERNAL) Override C{dflts} with specified C{kwds}. 

''' 

d = dflts 

if kwds: 

d = _copy(d) 

d.update(kwds) 

return d 

 

 

def _xkwds_Error(where, kwds, name_txt, txt=_default_): 

# Helper for _xkwds_get, _xkwds_pop and _xkwds_popitem below 

pairs = _MODS.streprs.pairs 

f = _COMMASPACE_.join(pairs(kwds) + pairs(name_txt)) 

f = _MODS.streprs.Fmt.PAREN(where.__name__, f) 

t = _multiple_ if name_txt else _no_ 

t = _SPACE_(t, _EQUAL_(_name_, txt), _kwargs_) 

return _AssertionError(f, txt=t) 

 

 

def _xkwds_get(kwds, **name_default): 

'''(INTERNAL) Get a C{kwds} value by C{name}, or the C{default}. 

''' 

if len(name_default) == 1: 

for n, d in name_default.items(): 

return kwds.get(n, d) 

 

raise _xkwds_Error(_xkwds_get, kwds, name_default) 

 

 

def _xkwds_get_(kwds, **names_defaults): 

'''(INTERNAL) Yield each C{kwds} value by C{name} or its C{default} 

in I{alphabetically sorted} order. 

''' 

for n, d in sorted(names_defaults.items()): 

yield kwds.get(n, d) 

 

 

def _xkwds_not(*args, **kwds): 

'''(INTERNAL) Return C{kwds} with a value not in C{args}. 

''' 

return dict((n, v) for n, v in kwds.items() if v not in args) 

 

 

def _xkwds_pop(kwds, **name_default): 

'''(INTERNAL) Pop a C{kwds} value by C{name}, or the C{default}. 

''' 

if len(name_default) == 1: 

return kwds.pop(*name_default.popitem()) 

 

raise _xkwds_Error(_xkwds_pop, kwds, name_default) 

 

 

def _xkwds_popitem(name_value): 

'''(INTERNAL) Return exactly one C{(name, value)} item. 

''' 

if len(name_value) == 1: # XXX TypeError 

return name_value.popitem() # XXX AttributeError 

 

raise _xkwds_Error(_xkwds_popitem, (), name_value, txt=_value_) 

 

# **) MIT License 

# 

# Copyright (C) 2016-2022 -- mrJean1 at Gmail -- All Rights Reserved. 

# 

# Permission is hereby granted, free of charge, to any person obtaining a 

# copy of this software and associated documentation files (the "Software"), 

# to deal in the Software without restriction, including without limitation 

# the rights to use, copy, modify, merge, publish, distribute, sublicense, 

# and/or sell copies of the Software, and to permit persons to whom the 

# Software is furnished to do so, subject to the following conditions: 

# 

# The above copyright notice and this permission notice shall be included 

# in all copies or substantial portions of the Software. 

# 

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 

# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 

# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 

# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 

# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 

# OTHER DEALINGS IN THE SOFTWARE.