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test_context.py
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test_context.py
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"""
JSON-LD Context Spec
"""
from __future__ import unicode_literals
from rdflib_jsonld.context import Context, Term
from rdflib_jsonld import errors
# exception utility (see also nose.tools.raises)
from functools import wraps
def _expect_exception(expected_error):
def _try_wrapper(f):
@wraps(f)
def _try():
try:
f()
assert e == expected_error
except Exception as e:
success = e == expected_error
else:
success = False
assert success, "Expected %r" % expected_error
return _try
return _try_wrapper
def test_create_context():
ctx = Context()
ctx.add_term('label', 'http://example.org/ns/label')
term = ctx.terms.get('label')
assert term.name == 'label'
assert ctx.find_term('http://example.org/ns/label') is term
def test_select_term_based_on_value_characteristics():
ctx = Context()
ctx.add_term('updated', 'http://example.org/ns/updated')
ctx.add_term('updatedDate', 'http://example.org/ns/updated',
coercion='http://www.w3.org/2001/XMLSchema#date')
assert ctx.find_term('http://example.org/ns/updated').name == 'updated'
assert ctx.find_term('http://example.org/ns/updated',
coercion='http://www.w3.org/2001/XMLSchema#date').name == 'updatedDate'
#ctx.find_term('http://example.org/ns/title_sv', language='sv')
#ctx.find_term('http://example.org/ns/authorList', container='@set')
#ctx.find_term('http://example.org/ns/creator', reverse=True)
def test_getting_keyword_values_from_nodes():
ctx = Context()
assert ctx.get_id({'@id': 'urn:x:1'}) == 'urn:x:1'
assert ctx.get_language({'@language': 'en'}) == 'en'
def test_parsing_a_context_expands_prefixes():
ctx = Context({
'@vocab': 'http://example.org/ns/',
'x': 'http://example.org/ns/',
'label': 'x:label',
'x:updated': {'@type': 'x:date'}})
term = ctx.terms.get('label')
assert term.id == 'http://example.org/ns/label'
term = ctx.terms.get('x:updated')
assert term.id == 'http://example.org/ns/updated'
assert term.type == 'http://example.org/ns/date'
# test_expanding_terms():
assert ctx.expand('term') == 'http://example.org/ns/term'
assert ctx.expand('x:term') == 'http://example.org/ns/term'
# test_shrinking_iris():
assert ctx.shrink_iri('http://example.org/ns/term') == 'x:term'
assert ctx.to_symbol('http://example.org/ns/term') == 'term'
def test_resolving_iris():
ctx = Context({'@base': 'http://example.org/path/leaf'})
assert ctx.resolve('/') == 'http://example.org/'
assert ctx.resolve('/trail') == 'http://example.org/trail'
assert ctx.resolve('../') == 'http://example.org/'
assert ctx.resolve('../../') == 'http://example.org/'
def test_accessing_keyword_values_by_alias():
ctx = Context({'iri': '@id', 'lang': '@language'})
assert ctx.get_id({'iri': 'urn:x:1'}) == 'urn:x:1'
assert ctx.get_language({'lang': 'en'}) == 'en'
# test_standard_keywords_still_work():
assert ctx.get_id({'@id': 'urn:x:1'}) == 'urn:x:1'
# test_representing_keywords_by_alias():
assert ctx.id_key == 'iri'
assert ctx.lang_key == 'lang'
def test_creating_a_subcontext():
ctx = Context()
ctx4 = ctx.subcontext({'lang': '@language'})
assert ctx4.get_language({'lang': 'en'}) == 'en'
# Mock external sources loading
from rdflib_jsonld import context
_source_to_sjon = context.source_to_json
SOURCES = {}
context.source_to_json = SOURCES.get
def test_loading_contexts():
# Given context data:
source1 = "http://example.org/base.jsonld"
source2 = "http://example.org/context.jsonld"
SOURCES[source1] = {'@context': {"@vocab": "http://example.org/vocab/"}}
SOURCES[source2] = {'@context': [source1, {"n": "name"}]}
# Create a context:
ctx = Context(source2)
assert ctx.expand('n') == 'http://example.org/vocab/name'
# Context can be a list:
ctx = Context([source2])
assert ctx.expand('n') == 'http://example.org/vocab/name'
def test_use_base_in_local_context():
ctx = Context({'@base': "/local"})
assert ctx.base == '/local'
def test_override_base():
ctx = Context(base="http://example.org/app/data/item",
source={'@base': "http://example.org/"})
assert ctx.base == "http://example.org/"
def test_set_null_base():
ctx = Context(base="http://example.org/app/data/item",
source={'@base': None})
assert ctx.base is None
assert ctx.resolve_iri("../other") == "../other"
def test_ignore_base_remote_context():
ctx_url = "http://example.org/remote-base.jsonld"
SOURCES[ctx_url] = {'@context': {'@base': "/remote"}}
ctx = Context(ctx_url)
assert ctx.base == None
@_expect_exception(errors.RECURSIVE_CONTEXT_INCLUSION)
def test_recursive_context_inclusion_error():
ctx_url = "http://example.org/recursive.jsonld"
SOURCES[ctx_url] = {'@context': ctx_url}
ctx = Context(ctx_url)
@_expect_exception(errors.INVALID_REMOTE_CONTEXT)
def test_invalid_remote_context():
ctx_url = "http://example.org/recursive.jsonld"
SOURCES[ctx_url] = {"key": "value"}
ctx = Context(ctx_url)