#!/usr/bin/env python
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"""Unittest for helpers module."""

import unittest

from gflags import _helpers


class FlagSuggestionTest(unittest.TestCase):

  def setUp(self):
    self.longopts = [
        'fsplit-ivs-in-unroller=',
        'fsplit-wide-types=',
        'fstack-protector=',
        'fstack-protector-all=',
        'fstrict-aliasing=',
        'fstrict-overflow=',
        'fthread-jumps=',
        'ftracer',
        'ftree-bit-ccp',
        'ftree-builtin-call-dce',
        'ftree-ccp',
        'ftree-ch']

  def testDamerauLevenshteinId(self):
    self.assertEquals(0, _helpers._DamerauLevenshtein('asdf', 'asdf'))

  def testDamerauLevenshteinEmpty(self):
    self.assertEquals(5, _helpers._DamerauLevenshtein('', 'kites'))
    self.assertEquals(6, _helpers._DamerauLevenshtein('kitten', ''))

  def testDamerauLevenshteinCommutative(self):
    self.assertEquals(2, _helpers._DamerauLevenshtein('kitten', 'kites'))
    self.assertEquals(2, _helpers._DamerauLevenshtein('kites', 'kitten'))

  def testDamerauLevenshteinTransposition(self):
    self.assertEquals(1, _helpers._DamerauLevenshtein('kitten', 'ktiten'))

  def testMispelledSuggestions(self):
    suggestions = _helpers.GetFlagSuggestions('fstack_protector_all',
                                              self.longopts)
    self.assertEquals(['fstack-protector-all'], suggestions)

  def testAmbiguousPrefixSuggestion(self):
    suggestions = _helpers.GetFlagSuggestions('fstack', self.longopts)
    self.assertEquals(['fstack-protector', 'fstack-protector-all'], suggestions)

  def testMisspelledAmbiguousPrefixSuggestion(self):
    suggestions = _helpers.GetFlagSuggestions('stack', self.longopts)
    self.assertEquals(['fstack-protector', 'fstack-protector-all'], suggestions)

  def testCrazySuggestion(self):
    suggestions = _helpers.GetFlagSuggestions('asdfasdgasdfa', self.longopts)
    self.assertEquals([], suggestions)


def main():
  unittest.main()


if __name__ == '__main__':
  main()
