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#!/usr/bin/env python
# encoding: utf-8
# esmre_tests.py - tests for esmre module
# Copyright (C) 2007-2008 Tideway Systems Limited.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
# USA
import unittest
import esmre
class HintExtractionTests(unittest.TestCase):
def checkHints(self, expected_hints, regex):
self.assertEqual(set(expected_hints), set(esmre.hints(regex)))
def testSimpleString(self):
self.checkHints(["yarr"], r"yarr")
def testSkipsOptionalCharacter(self):
self.checkHints(["dubloon"], r"dubloons?")
def testStartsNewStringAfterOptionalCharacter(self):
self.checkHints(["ship", "shape"], r"ship ?shape")
def testSkipsOptionalRepeatedCharacter(self):
self.checkHints(["bristol", "fasion"], r"bristol *fasion")
def testIncludesRepeatedCharacterButStartsNewHint(self):
self.checkHints(["ava", "st me harties"], r"ava+st me harties")
def testSkipsGroupsWithAlternation(self):
self.checkHints(
["Hoist the ", ", ye ", "!"],
r"Hoist the (mizzen mast|main brace), "
r"ye (landlubbers|scurvy dogs)!",
)
def testSkipsAny(self):
self.checkHints(
["After 10 paces, ", " marks the spot"],
r"After 10 paces, . marks the spot",
)
def testSkipsOneOrMoreAny(self):
self.checkHints(["Hard to ", "!"], r"Hard to .+!")
def testSkipsNestedGroups(self):
self.checkHints(
["Squark!", " Pieces of ", "!"], r"Squark!( Pieces of (.+)!)"
)
def testSkipsCharacterClass(self):
self.checkHints(["r"], r"[ya]a*r+")
def testRightBracketDoesNotCloseGroupIfInClass(self):
self.checkHints([":=", "X"], r":=([)D])X")
def testSkipsBackslashMetacharacters(self):
self.checkHints(["Cap'n", " ", " Beard"], r"Cap'n\b ([\S] Beard)")
def testBackslashBracketDoesNotCloseGroup(self):
self.checkHints([":=", "X"], r":=(\)|D)X")
def testBackslashSquareBracketDoesNotCloseClass(self):
self.checkHints([":=", "X"], r":=[)D\]]X")
def testSkipsMetacharactersAfterGroups(self):
self.checkHints(
["Yo ", "ho ", " and a bottle of rum"],
r"Yo (ho )+ and a bottle of rum",
)
def testSkipsRepetionBraces(self):
self.checkHints(["A", ", me harties"], r"Ar{2-10}, me harties")
def testAlternationCausesEmptyResult(self):
self.checkHints([], r"rum|grog")
def testSkipMatchBeginning(self):
self.checkHints(["The black perl"], r"^The black perl")
def testSkipMatchEnd(self):
self.checkHints(["Davey Jones' Locker"], r"Davey Jones' Locker$")
def testOnlyGroupGivesEmptyResult(self):
self.checkHints([], r"(rum|grog)")
def testGetsHintsFromGroups(self):
self.checkHints(["/"], r"([0-3][0-9]/[0-1][0-9]/[1-2][0-9]{3})")
def testSkipsOptionalGroups(self):
self.checkHints(["Shiver me timbers!"], r"Shiver me timbers!( Arrr!)?")
def testSkipsMostExtensionGroups(self):
for regex in [
# set flag
r"(?i)(?L)(?m)(?s)(?u)(?x)",
# non-grouping paren
r"(?:foo)",
# previous named group
r"(?P=foo)",
# comment
r"(?#foo)",
# lookahead
r"(?=foo)",
# negative lookahead
r"(?!foo)",
# lookbehind
r"(?<=foo)",
# negative lookbehind
r"(?<!foo)",
# conditional match
r"(?(1)foo|bar)",
]:
self.checkHints([], regex)
def testGetsHintsFromNamedGroup(self):
self.checkHints(
["/"], r"(?P<date>[0-3][0-9]/[0-1][0-9]/[1-2][0-9]{3})"
)
class ShortlistTests(unittest.TestCase):
def checkShortlist(self, expected_shortlist, hints):
self.assertEqual(expected_shortlist, esmre.shortlist(hints))
def testShortlistIsEmptyForEmptyCandidates(self):
self.checkShortlist([], [])
def testShortlistIsOnlyCandidate(self):
self.checkShortlist(["Blue Beard"], ["Blue Beard"])
def testShorlistSelectsLongestCandidate(self):
self.checkShortlist(["Black Beard"], ["Black Beard", "Blue Beard"])
def testShorlistSelectsLongestCandidateAtEnd(self):
self.checkShortlist(
["Yellow Beard"], ["Black Beard", "Blue Beard", "Yellow Beard"]
)
class IndexTests(unittest.TestCase):
def setUp(self):
self.index = esmre.Index()
self.index.enter(r"Major-General\W*$", "savoy opera")
self.index.enter(r"\bway\W+haye?\b", "sea shanty")
def testSingleQuery(self):
self.assertEqual(
["savoy opera"],
self.index.query("I am the very model of a modern Major-General."),
)
def testCannotEnterAfterQuery(self):
self.index.query("blah")
self.assertRaises(TypeError, self.index.enter, "foo", "bar")
def testCaseInsensitive(self):
self.assertEqual(
["sea shanty"], self.index.query("Way, hay up she rises,")
)
self.assertEqual(
["sea shanty"],
self.index.query("To my way haye, blow the man down,"),
)
def testAlwaysReportsOpjectForHintlessExpressions(self):
self.index.enter(r"(\d+\s)*(paces|yards)", "distance")
self.assertTrue("distance" in self.index.query("'til morning"))
if __name__ == "__main__":
unittest.main()
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