148 lines
5.5 KiB
Python
148 lines
5.5 KiB
Python
"""Tests of the builder registry."""
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import unittest
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import warnings
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from bs4 import BeautifulSoup
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from bs4.builder import (
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builder_registry as registry,
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HTMLParserTreeBuilder,
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TreeBuilderRegistry,
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)
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try:
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from bs4.builder import HTML5TreeBuilder
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HTML5LIB_PRESENT = True
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except ImportError:
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HTML5LIB_PRESENT = False
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try:
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from bs4.builder import (
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LXMLTreeBuilderForXML,
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LXMLTreeBuilder,
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)
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LXML_PRESENT = True
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except ImportError:
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LXML_PRESENT = False
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class BuiltInRegistryTest(unittest.TestCase):
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"""Test the built-in registry with the default builders registered."""
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def test_combination(self):
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if LXML_PRESENT:
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self.assertEqual(registry.lookup('fast', 'html'),
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LXMLTreeBuilder)
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if LXML_PRESENT:
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self.assertEqual(registry.lookup('permissive', 'xml'),
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LXMLTreeBuilderForXML)
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self.assertEqual(registry.lookup('strict', 'html'),
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HTMLParserTreeBuilder)
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if HTML5LIB_PRESENT:
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self.assertEqual(registry.lookup('html5lib', 'html'),
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HTML5TreeBuilder)
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def test_lookup_by_markup_type(self):
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if LXML_PRESENT:
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self.assertEqual(registry.lookup('html'), LXMLTreeBuilder)
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self.assertEqual(registry.lookup('xml'), LXMLTreeBuilderForXML)
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else:
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self.assertEqual(registry.lookup('xml'), None)
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if HTML5LIB_PRESENT:
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self.assertEqual(registry.lookup('html'), HTML5TreeBuilder)
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else:
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self.assertEqual(registry.lookup('html'), HTMLParserTreeBuilder)
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def test_named_library(self):
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if LXML_PRESENT:
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self.assertEqual(registry.lookup('lxml', 'xml'),
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LXMLTreeBuilderForXML)
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self.assertEqual(registry.lookup('lxml', 'html'),
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LXMLTreeBuilder)
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if HTML5LIB_PRESENT:
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self.assertEqual(registry.lookup('html5lib'),
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HTML5TreeBuilder)
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self.assertEqual(registry.lookup('html.parser'),
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HTMLParserTreeBuilder)
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def test_beautifulsoup_constructor_does_lookup(self):
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with warnings.catch_warnings(record=True) as w:
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# This will create a warning about not explicitly
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# specifying a parser, but we'll ignore it.
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# You can pass in a string.
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BeautifulSoup("", features="html")
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# Or a list of strings.
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BeautifulSoup("", features=["html", "fast"])
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# You'll get an exception if BS can't find an appropriate
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# builder.
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self.assertRaises(ValueError, BeautifulSoup,
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"", features="no-such-feature")
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class RegistryTest(unittest.TestCase):
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"""Test the TreeBuilderRegistry class in general."""
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def setUp(self):
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self.registry = TreeBuilderRegistry()
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def builder_for_features(self, *feature_list):
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cls = type('Builder_' + '_'.join(feature_list),
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(object,), {'features' : feature_list})
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self.registry.register(cls)
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return cls
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def test_register_with_no_features(self):
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builder = self.builder_for_features()
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# Since the builder advertises no features, you can't find it
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# by looking up features.
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self.assertEqual(self.registry.lookup('foo'), None)
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# But you can find it by doing a lookup with no features, if
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# this happens to be the only registered builder.
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self.assertEqual(self.registry.lookup(), builder)
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def test_register_with_features_makes_lookup_succeed(self):
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builder = self.builder_for_features('foo', 'bar')
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self.assertEqual(self.registry.lookup('foo'), builder)
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self.assertEqual(self.registry.lookup('bar'), builder)
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def test_lookup_fails_when_no_builder_implements_feature(self):
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builder = self.builder_for_features('foo', 'bar')
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self.assertEqual(self.registry.lookup('baz'), None)
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def test_lookup_gets_most_recent_registration_when_no_feature_specified(self):
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builder1 = self.builder_for_features('foo')
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builder2 = self.builder_for_features('bar')
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self.assertEqual(self.registry.lookup(), builder2)
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def test_lookup_fails_when_no_tree_builders_registered(self):
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self.assertEqual(self.registry.lookup(), None)
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def test_lookup_gets_most_recent_builder_supporting_all_features(self):
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has_one = self.builder_for_features('foo')
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has_the_other = self.builder_for_features('bar')
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has_both_early = self.builder_for_features('foo', 'bar', 'baz')
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has_both_late = self.builder_for_features('foo', 'bar', 'quux')
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lacks_one = self.builder_for_features('bar')
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has_the_other = self.builder_for_features('foo')
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# There are two builders featuring 'foo' and 'bar', but
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# the one that also features 'quux' was registered later.
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self.assertEqual(self.registry.lookup('foo', 'bar'),
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has_both_late)
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# There is only one builder featuring 'foo', 'bar', and 'baz'.
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self.assertEqual(self.registry.lookup('foo', 'bar', 'baz'),
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has_both_early)
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def test_lookup_fails_when_cannot_reconcile_requested_features(self):
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builder1 = self.builder_for_features('foo', 'bar')
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builder2 = self.builder_for_features('foo', 'baz')
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self.assertEqual(self.registry.lookup('bar', 'baz'), None)
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