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"""Tests for the Formatters."""
from math import pi
try:
import numpy
except:
numpy = None
import nose.tools as nt
from IPython.config import Config
from IPython.core.formatters import (
PlainTextFormatter, HTMLFormatter, PDFFormatter, _mod_name_key
)
from IPython.utils.io import capture_output
class A(object):
def __repr__(self):
return 'A()'
class B(A):
def __repr__(self):
return 'B()'
class C:
pass
class BadPretty(object):
_repr_pretty_ = None
class GoodPretty(object):
def _repr_pretty_(self, pp, cycle):
pp.text('foo')
def __repr__(self):
return 'GoodPretty()'
def foo_printer(obj, pp, cycle):
pp.text('foo')
def test_pretty():
f = PlainTextFormatter()
f.for_type(A, foo_printer)
nt.assert_equal(f(A()), 'foo')
nt.assert_equal(f(B()), 'foo')
nt.assert_equal(f(GoodPretty()), 'foo')
# Just don't raise an exception for the following:
f(BadPretty())
f.pprint = False
nt.assert_equal(f(A()), 'A()')
nt.assert_equal(f(B()), 'B()')
nt.assert_equal(f(GoodPretty()), 'GoodPretty()')
def test_deferred():
f = PlainTextFormatter()
def test_precision():
"""test various values for float_precision."""
f = PlainTextFormatter()
nt.assert_equal(f(pi), repr(pi))
f.float_precision = 0
if numpy:
po = numpy.get_printoptions()
nt.assert_equal(po['precision'], 0)
nt.assert_equal(f(pi), '3')
f.float_precision = 2
if numpy:
po = numpy.get_printoptions()
nt.assert_equal(po['precision'], 2)
nt.assert_equal(f(pi), '3.14')
f.float_precision = '%g'
if numpy:
po = numpy.get_printoptions()
nt.assert_equal(po['precision'], 2)
nt.assert_equal(f(pi), '3.14159')
f.float_precision = '%e'
nt.assert_equal(f(pi), '3.141593e+00')
f.float_precision = ''
if numpy:
po = numpy.get_printoptions()
nt.assert_equal(po['precision'], 8)
nt.assert_equal(f(pi), repr(pi))
def test_bad_precision():
"""test various invalid values for float_precision."""
f = PlainTextFormatter()
def set_fp(p):
f.float_precision=p
nt.assert_raises(ValueError, set_fp, '%')
nt.assert_raises(ValueError, set_fp, '%.3f%i')
nt.assert_raises(ValueError, set_fp, 'foo')
nt.assert_raises(ValueError, set_fp, -1)
def test_for_type():
f = PlainTextFormatter()
# initial return, None
nt.assert_is(f.for_type(C, foo_printer), None)
# no func queries
nt.assert_is(f.for_type(C), foo_printer)
# shouldn't change anything
nt.assert_is(f.for_type(C), foo_printer)
# None should do the same
nt.assert_is(f.for_type(C, None), foo_printer)
nt.assert_is(f.for_type(C, None), foo_printer)
def test_for_type_string():
f = PlainTextFormatter()
mod = C.__module__
type_str = '%s.%s' % (C.__module__, 'C')
# initial return, None
nt.assert_is(f.for_type(type_str, foo_printer), None)
# no func queries
nt.assert_is(f.for_type(type_str), foo_printer)
nt.assert_in(_mod_name_key(C), f.deferred_printers)
nt.assert_is(f.for_type(C), foo_printer)
nt.assert_not_in(_mod_name_key(C), f.deferred_printers)
nt.assert_in(C, f.type_printers)
def test_for_type_by_name():
f = PlainTextFormatter()
mod = C.__module__
# initial return, None
nt.assert_is(f.for_type_by_name(mod, 'C', foo_printer), None)
# no func queries
nt.assert_is(f.for_type_by_name(mod, 'C'), foo_printer)
# shouldn't change anything
nt.assert_is(f.for_type_by_name(mod, 'C'), foo_printer)
# None should do the same
nt.assert_is(f.for_type_by_name(mod, 'C', None), foo_printer)
nt.assert_is(f.for_type_by_name(mod, 'C', None), foo_printer)
def test_lookup():
f = PlainTextFormatter()
f.for_type(C, foo_printer)
nt.assert_is(f.lookup(C()), foo_printer)
with nt.assert_raises(KeyError):
f.lookup(A())
def test_lookup_string():
f = PlainTextFormatter()
type_str = '%s.%s' % (C.__module__, 'C')
f.for_type(type_str, foo_printer)
nt.assert_is(f.lookup(C()), foo_printer)
# should move from deferred to imported dict
nt.assert_not_in(_mod_name_key(C), f.deferred_printers)
nt.assert_in(C, f.type_printers)
def test_lookup_by_type():
f = PlainTextFormatter()
f.for_type(C, foo_printer)
nt.assert_is(f.lookup_by_type(C), foo_printer)
type_str = '%s.%s' % (C.__module__, 'C')
with nt.assert_raises(KeyError):
f.lookup_by_type(A)
def test_lookup_by_type_string():
f = PlainTextFormatter()
type_str = '%s.%s' % (C.__module__, 'C')
f.for_type(type_str, foo_printer)
# verify insertion
nt.assert_in(_mod_name_key(C), f.deferred_printers)
nt.assert_not_in(C, f.type_printers)
nt.assert_is(f.lookup_by_type(type_str), foo_printer)
# lookup by string doesn't cause import
nt.assert_in(_mod_name_key(C), f.deferred_printers)
nt.assert_not_in(C, f.type_printers)
nt.assert_is(f.lookup_by_type(C), foo_printer)
# should move from deferred to imported dict
nt.assert_not_in(_mod_name_key(C), f.deferred_printers)
nt.assert_in(C, f.type_printers)
def test_in_formatter():
f = PlainTextFormatter()
f.for_type(C, foo_printer)
type_str = '%s.%s' % (C.__module__, 'C')
nt.assert_in(C, f)
nt.assert_in(type_str, f)
def test_string_in_formatter():
f = PlainTextFormatter()
type_str = '%s.%s' % (C.__module__, 'C')
f.for_type(type_str, foo_printer)
nt.assert_in(type_str, f)
nt.assert_in(C, f)
def test_pop():
f = PlainTextFormatter()
f.for_type(C, foo_printer)
nt.assert_is(f.lookup_by_type(C), foo_printer)
nt.assert_is(f.pop(C, None), foo_printer)
f.for_type(C, foo_printer)
nt.assert_is(f.pop(C), foo_printer)
with nt.assert_raises(KeyError):
f.lookup_by_type(C)
with nt.assert_raises(KeyError):
f.pop(C)
with nt.assert_raises(KeyError):
f.pop(A)
nt.assert_is(f.pop(A, None), None)
def test_pop_string():
f = PlainTextFormatter()
type_str = '%s.%s' % (C.__module__, 'C')
with nt.assert_raises(KeyError):
f.pop(type_str)
f.for_type(type_str, foo_printer)
f.pop(type_str)
with nt.assert_raises(KeyError):
f.lookup_by_type(C)
with nt.assert_raises(KeyError):
f.pop(type_str)
f.for_type(C, foo_printer)
nt.assert_is(f.pop(type_str, None), foo_printer)
with nt.assert_raises(KeyError):
f.lookup_by_type(C)
with nt.assert_raises(KeyError):
f.pop(type_str)
nt.assert_is(f.pop(type_str, None), None)
def test_warn_error_method():
f = HTMLFormatter()
class BadHTML(object):
def _repr_html_(self):
return 1/0
bad = BadHTML()
with capture_output() as captured:
result = f(bad)
nt.assert_is(result, None)
nt.assert_in("FormatterWarning", captured.stderr)
nt.assert_in("text/html", captured.stderr)
nt.assert_in("zero", captured.stderr)
def test_nowarn_notimplemented():
f = HTMLFormatter()
class HTMLNotImplemented(object):
def _repr_html_(self):
raise NotImplementedError
return 1/0
h = HTMLNotImplemented()
with capture_output() as captured:
result = f(h)
nt.assert_is(result, None)
nt.assert_not_in("FormatterWarning", captured.stderr)
def test_warn_error_for_type():
f = HTMLFormatter()
f.for_type(int, lambda i: name_error)
with capture_output() as captured:
result = f(5)
nt.assert_is(result, None)
nt.assert_in("FormatterWarning", captured.stderr)
nt.assert_in("text/html", captured.stderr)
nt.assert_in("name_error", captured.stderr)
def test_warn_error_pretty_method():
f = PlainTextFormatter()
class BadPretty(object):
def _repr_pretty_(self):
return "hello"
bad = BadPretty()
with capture_output() as captured:
result = f(bad)
nt.assert_is(result, None)
nt.assert_in("FormatterWarning", captured.stderr)
nt.assert_in("text/plain", captured.stderr)
nt.assert_in("argument", captured.stderr)
class MakePDF(object):
def _repr_pdf_(self):
return 'PDF'
def test_pdf_formatter():
pdf = MakePDF()
f = PDFFormatter()
nt.assert_equal(f(pdf), 'PDF')
def test_print_method_bound():
f = HTMLFormatter()
class MyHTML(object):
def _repr_html_(self):
return "hello"
with capture_output() as captured:
result = f(MyHTML)
nt.assert_is(result, None)
nt.assert_not_in("FormatterWarning", captured.stderr)
with capture_output() as captured:
result = f(MyHTML())
nt.assert_equal(result, "hello")
nt.assert_equal(captured.stderr, "")
def test_format_config():
"""config objects don't pretend to support fancy reprs with lazy attrs"""
f = HTMLFormatter()
cfg = Config()
with capture_output() as captured:
result = f(cfg)
nt.assert_is(result, None)
nt.assert_equal(captured.stderr, "")
with capture_output() as captured:
result = f(Config)
nt.assert_is(result, None)
nt.assert_equal(captured.stderr, "")
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