Code Coverage for nltk.parse.util
Partially Tested Functions
"""
Utility functions for parsers.
"""
from featurechart import load_earley
class TestGrammar(object):
"""
Unit tests for CFG.
"""
def __init__(self, grammar, suite, accept=None, reject=None):
self.test_grammar = grammar
self.cp = load_earley(grammar, trace=0)
self.suite = suite
self._accept = accept
self._reject = reject
def run(self, show_trees=False):
"""
Sentences in the test suite are divided into two classes:
- grammatical (C{accept}) and
- ungrammatical (C{reject}).
If a sentence should parse accordng to the grammar, the value of
C{trees} will be a non-empty list. If a sentence should be rejected
according to the grammar, then the value of C{trees} will be C{None}.
"""
for test in self.suite:
print test['doc'] + ":",
for key in ['accept', 'reject']:
for sent in test[key]:
tokens = sent.split()
trees = self.cp.parse(tokens)
if show_trees and trees:
print
print sent
for tree in trees:
print tree
if key=='accept':
if trees == []:
raise ValueError, "Sentence '%s' failed to parse'" % sent
else:
accepted = True
else:
if trees:
raise ValueError, "Sentence '%s' received a parse'" % sent
else:
rejected = True
if accepted and rejected:
print "All tests passed!"