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"""
Aho-Corasick string search algorithm.
Author : Wojciech Muła, wojciech_mula@poczta.onet.pl
WWW : http://0x80.pl
License : public domain
"""
import unittest
from pyahocorasick import Trie
class TestTrie(unittest.TestCase):
def testEmptyTrieShouldNotContainsAnyWords(self):
t = Trie()
self.assertEqual(len(t), 0)
def testAddedWordShouldBeCountedAndAvailableForRetrieval(self):
t = Trie()
t.add_word('python', 'value')
self.assertEqual(len(t), 1)
self.assertEqual(t.get('python'), 'value')
def testAddingExistingWordShouldReplaceAssociatedValue(self):
t = Trie()
t.add_word('python', 'value')
self.assertEqual(len(t), 1)
self.assertEqual(t.get('python'), 'value')
t.add_word('python', 'other')
self.assertEqual(len(t), 1)
self.assertEqual(t.get('python'), 'other')
def testGetUnknowWordWithoutDefaultValueShouldRaiseException(self):
t = Trie()
with self.assertRaises(KeyError):
t.get('python')
def testGetUnknowWordWithDefaultValueShouldReturnDefault(self):
t = Trie()
self.assertEqual(t.get('python', 'default'), 'default')
def testExistShouldDetectAddedWords(self):
t = Trie()
t.add_word('python', 'value')
t.add_word('ada', 'value')
self.assertTrue(t.exists('python'))
self.assertTrue(t.exists('ada'))
def testExistShouldReturnFailOnUnknownWord(self):
t = Trie()
t.add_word('python', 'value')
self.assertFalse(t.exists('ada'))
def testMatchShouldDetecAllPrefixesIncludingWord(self):
t = Trie()
t.add_word('python', 'value')
t.add_word('ada', 'value')
self.assertTrue(t.match('a'))
self.assertTrue(t.match('ad'))
self.assertTrue(t.match('ada'))
self.assertTrue(t.match('p'))
self.assertTrue(t.match('py'))
self.assertTrue(t.match('pyt'))
self.assertTrue(t.match('pyth'))
self.assertTrue(t.match('pytho'))
self.assertTrue(t.match('python'))
def testItemsShouldReturnAllItemsAlreadyAddedToTheTrie(self):
t = Trie()
t.add_word('python', 1)
t.add_word('ada', 2)
t.add_word('perl', 3)
t.add_word('pascal', 4)
t.add_word('php', 5)
result = list(t.items())
self.assertEquals(len(result), 5)
self.assertIn(('python', 1), result)
self.assertIn(('ada', 2), result)
self.assertIn(('perl', 3), result)
self.assertIn(('pascal', 4), result)
self.assertIn(('php', 5), result)
def testKeysShouldReturnAllKeysAlreadyAddedToTheTrie(self):
t = Trie()
t.add_word('python', 1)
t.add_word('ada', 2)
t.add_word('perl', 3)
t.add_word('pascal', 4)
t.add_word('php', 5)
result = list(t.keys())
self.assertEquals(len(result), 5)
self.assertIn('python',result)
self.assertIn('ada', result)
self.assertIn('perl', result)
self.assertIn('pascal',result)
self.assertIn('php', result)
def testValuesShouldReturnAllValuesAlreadyAddedToTheTrie(self):
t = Trie()
t.add_word('python', 1)
t.add_word('ada', 2)
t.add_word('perl', 3)
t.add_word('pascal', 4)
t.add_word('php', 5)
result = list(t.values())
self.assertEquals(len(result), 5)
self.assertIn(1, result)
self.assertIn(2, result)
self.assertIn(3, result)
self.assertIn(4, result)
self.assertIn(5, result)
def testClearShouldRemoveEveryting(self):
t = Trie()
t.add_word('python', 1)
t.add_word('ada', 2)
t.add_word('perl', 3)
t.add_word('pascal', 4)
t.add_word('php', 5)
self.assertEqual(len(t), 5)
self.assertEqual(len(list(t.items())), 5)
t.clear()
self.assertEqual(len(t), 0)
self.assertEqual(len(list(t.items())), 0)
def testIterShouldMatchAllStrings(self):
def get_test_automaton():
words = "he her hers his she hi him man himan".split()
t = Trie();
for w in words:
t.add_word(w, w)
t.make_automaton()
return t
test_string = "he she himan"
t = get_test_automaton()
result = list(t.iter(test_string))
# there are 5 matching positions
self.assertEquals(len(result), 5)
# result should have be valid, i.e. returned position and substring
# must match substring from test string
for end_index, strings in result:
for s in strings:
n = len(s)
self.assertEqual(s, test_string[end_index - n + 1 : end_index + 1])
def testFindAllShouldGetTheSameDataAsIter(self):
def get_test_automaton():
words = "he her hers his she hi him man himan".split()
t = Trie();
for w in words:
t.add_word(w, w)
t.make_automaton()
return t
find_all_arguments = []
def find_all_callback(end_index, strings):
find_all_arguments.append((end_index, strings))
t = get_test_automaton()
test_string = "he she himan"
t.find_all(test_string, find_all_callback)
result_items = list(t.iter(test_string))
self.assertEquals(find_all_arguments, result_items)
if __name__ == '__main__':
unittest.main()
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