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Avoid importing holoviews when nbsmoke is imported. #36

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Dec 18, 2019
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Avoid importing holoviews when nbsmoke is imported. #36

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1b38862
Try delaying hv import (just deepening the hackery, since we plan to …
ceball Dec 17, 2019
a27e6fd
Remove unused import.
ceball Dec 17, 2019
6a583b9
Right way to get message from exception? (py2 and 3)
ceball Dec 17, 2019
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12 changes: 4 additions & 8 deletions nbsmoke/lint/magics/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,9 +30,6 @@
from . import holoviews_support
from . import builtins_support

# as noted in that file, shouldn't be there but should just be replaced iwth something better anyway
_Unavailable = holoviews_support._Unavailable

# TODO: still nede to investigate the following line magics (and what
# does ipython convert do to them?):
#
Expand Down Expand Up @@ -170,11 +167,10 @@ def _get_parser(line): # yuck
return parsers[None](line) # default/no magic

def _call_a_handler(handlers, magic):
handler = handlers[magic.name]
if isinstance(handler, _Unavailable):
# this is a bit rubbish. and how to reconstruct original error?
raise Exception("nbsmoke can't process the following '%s' magic without additional dependencies:\n %s\n. Error was:\n %s"%(magic.name, magic.line, handler.e.msg))
return handler(magic)
try:
return handlers[magic.name](magic)
except ImportError as e:
raise ImportError("nbsmoke can't process the following '%s' magic without additional dependencies:\n %s\n. Error was:\n %s"%(magic.name, magic.line, e))

def _process_magics(magic, other_magic_handlers, ignored_magics, blacklisted_magics, simple_magics=None):
if simple_magics is None:
Expand Down
177 changes: 88 additions & 89 deletions nbsmoke/lint/magics/holoviews_support.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,103 +6,102 @@

from itertools import groupby

# placeholder for unavailable imports - should do something better (also, not specific to hv)
class _Unavailable:
def __init__(self,e):
self.e = e
IGNORED_LINE_MAGICS = ['output']
IGNORED_CELL_MAGICS = ['output']

try:
from holoviews.util.parser import OptsSpec
except ImportError as e:
OptsSpec = _Unavailable(e)
import numpy # noqa: Some bad numpy/pytest interaction. Without importing numpy here (so it happens when nbsmoke is imported, i.e. at plugin load time,
# we get the traceback in https://github.com/numpy/numpy/issues/14012 (no idea if same cause)
except ImportError:
pass

IGNORED_LINE_MAGICS = ['output']
IGNORED_CELL_MAGICS = ['output']
def _make_optsspec():
from holoviews.util.parser import OptsSpec

class NbSmokeOptsSpec(OptsSpec):

@classmethod
def _hvparse(cls, line, ns={}):
"""
Parse an options specification, returning a dictionary with
path keys and {'plot':<options>, 'style':<options>} values.
"""
parses = [p for p in cls.opts_spec.scanString(line)]
if len(parses) != 1:
raise SyntaxError("Invalid specification syntax.")
else:
e = parses[0][2]
processed = line[:e]
if (processed.strip() != line.strip()):
raise SyntaxError("Failed to parse remainder of string: %r" % line[e:])

grouped_paths = cls._group_paths_without_options(cls.opts_spec.parseString(line))
things = []
for pathspecs, group in grouped_paths:

# normalization = cls.process_normalization(group)
# if normalization is not None:
# options['norm'] = normalization

if 'plot_options' in group:
plotopts = group['plot_options'][0]
opts = cls.todict(plotopts, 'brackets', ns=ns)
things+=opts

if 'style_options' in group:
styleopts = group['style_options'][0]
opts = cls.todict(styleopts, 'parens', ns=ns)
things+=opts

return things

@classmethod
def _hvtodict(cls, parseresult, mode='parens', ns={}):
"""
Helper function to return dictionary given the parse results
from a pyparsing.nestedExpr object (containing keywords).

The ns is a dynamic namespace (typically the IPython Notebook
namespace) used to update the class-level namespace.
"""
grouped = []
things = []
tokens = cls.collect_tokens(parseresult, mode)
# Group tokens without '=' and append to last token containing '='
for group in groupby(tokens, lambda el: '=' in el):
(val, items) = group
if val is True:
grouped += list(items)
if val is False:
elements =list(items)
# Assume anything before ) or } can be joined with commas
# (e.g tuples with spaces in them)
joiner=',' if any(((')' in el) or ('}' in el))
for el in elements) else ''
grouped[-1] += joiner + joiner.join(elements)

for keyword in grouped:
# Tuple ('a', 3) becomes (,'a',3) and '(,' is never valid
# Same for some of the other joining errors corrected here
for (fst,snd) in [('(,', '('), ('{,', '{'), ('=,','='),
(',:',':'), (':,', ':'), (',,', ','),
(',.', '.')]:
keyword = keyword.replace(fst, snd)

things.append('dict(%s)' % keyword)

return things

return NbSmokeOptsSpec


def opts_handler(magic):
"""Given an opts magic, return line of python suitable for pyflakes."""
string_of_magic_args = magic.python
return " ; ".join(OptsSpec.parse(string_of_magic_args)) + " # noqa: here to use names for original %s magic: %s"%(magic.__class__.__name__, magic.python)

NbSmokeOptsSpec = _make_optsspec()
string_of_magic_args = magic.python
return " ; ".join(NbSmokeOptsSpec.parse(string_of_magic_args)) + " # noqa: here to use names for original %s magic: %s"%(magic.__class__.__name__, magic.python)

if isinstance(OptsSpec, _Unavailable):
opts_handler = OptsSpec # noqa: opts_handler unusable

cell_magic_handlers = {'opts': opts_handler}
line_magic_handlers = {'opts': opts_handler}


def _hvparse(cls, line, ns={}):
"""
Parse an options specification, returning a dictionary with
path keys and {'plot':<options>, 'style':<options>} values.
"""
parses = [p for p in cls.opts_spec.scanString(line)]
if len(parses) != 1:
raise SyntaxError("Invalid specification syntax.")
else:
e = parses[0][2]
processed = line[:e]
if (processed.strip() != line.strip()):
raise SyntaxError("Failed to parse remainder of string: %r" % line[e:])

grouped_paths = cls._group_paths_without_options(cls.opts_spec.parseString(line))
things = []
for pathspecs, group in grouped_paths:

# normalization = cls.process_normalization(group)
# if normalization is not None:
# options['norm'] = normalization

if 'plot_options' in group:
plotopts = group['plot_options'][0]
opts = cls.todict(plotopts, 'brackets', ns=ns)
things+=opts

if 'style_options' in group:
styleopts = group['style_options'][0]
opts = cls.todict(styleopts, 'parens', ns=ns)
things+=opts

return things


def _hvtodict(cls, parseresult, mode='parens', ns={}):
"""
Helper function to return dictionary given the parse results
from a pyparsing.nestedExpr object (containing keywords).

The ns is a dynamic namespace (typically the IPython Notebook
namespace) used to update the class-level namespace.
"""
grouped = []
things = []
tokens = cls.collect_tokens(parseresult, mode)
# Group tokens without '=' and append to last token containing '='
for group in groupby(tokens, lambda el: '=' in el):
(val, items) = group
if val is True:
grouped += list(items)
if val is False:
elements =list(items)
# Assume anything before ) or } can be joined with commas
# (e.g tuples with spaces in them)
joiner=',' if any(((')' in el) or ('}' in el))
for el in elements) else ''
grouped[-1] += joiner + joiner.join(elements)

for keyword in grouped:
# Tuple ('a', 3) becomes (,'a',3) and '(,' is never valid
# Same for some of the other joining errors corrected here
for (fst,snd) in [('(,', '('), ('{,', '{'), ('=,','='),
(',:',':'), (':,', ':'), (',,', ','),
(',.', '.')]:
keyword = keyword.replace(fst, snd)

things.append('dict(%s)' % keyword)

return things

if OptsSpec is not None:
OptsSpec.parse = classmethod(_hvparse)
OptsSpec.todict = classmethod(_hvtodict)
9 changes: 5 additions & 4 deletions tests/test_lint_magics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -428,15 +428,16 @@ def test_optional_import_warn(testdir):
testdir.makefile('.ipynb', testing123=nb_optional_dep)
###
# what a hack
def not_clever_magics_handler(magic):
raise ImportError("Amazing dependency is missing")
import nbsmoke.lint.magics as M
from collections import namedtuple
M.other_line_magic_handlers['clever_magic'] = M._Unavailable(namedtuple("SomeError", "msg")("A terrible error."))
M.other_line_magic_handlers['clever_magic'] = not_clever_magics_handler
###
result = testdir.runpytest(*lint_args)
assert result.ret == 1
result.stdout.re_match_lines_random(
[".*Exception: nbsmoke can't process the following 'clever_magic' magic without additional dependencies.*",
".*A terrible error.*"])
[".*ImportError: nbsmoke can't process the following 'clever_magic' magic without additional dependencies.*",
".*Amazing dependency is missing.*"])


def test_lint_line_magics_indent(testdir):
Expand Down