# ====================================================================
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
# ====================================================================

from unittest import TestCase, main
from lucene import *


class StopAnalyzerTestCase(TestCase):
    """
    Unit tests ported from Java Lucene
    """

    def setUp(self):

        self.stop = StopAnalyzer(Version.LUCENE_CURRENT)
        self.invalidTokens = StopAnalyzer.ENGLISH_STOP_WORDS_SET

    def testDefaults(self):

        self.assert_(self.stop is not None)
        reader = StringReader("This is a test of the english stop analyzer")
        stream = self.stop.tokenStream("test", reader)
        self.assert_(stream is not None)

        termAtt = stream.getAttribute(TermAttribute.class_)
    
        while stream.incrementToken():
            self.assert_(termAtt.term() not in self.invalidTokens)

    def testStopList(self):

        stopWords = ["good", "test", "analyzer"]
        stopWordsSet = HashSet()
        for stopWord in stopWords:
            stopWordsSet.add(stopWord)

        newStop = StopAnalyzer(Version.LUCENE_24, stopWordsSet)
        reader = StringReader("This is a good test of the english stop analyzer")
        stream = newStop.tokenStream("test", reader)
        self.assert_(stream is not None)

        termAtt = stream.getAttribute(TermAttribute.class_)
        posIncrAtt = stream.addAttribute(PositionIncrementAttribute.class_)
    
        while stream.incrementToken():
            text = termAtt.term()
            self.assert_(text not in stopWordsSet)
            # by default stop tokenizer does not apply increments.
            self.assertEqual(1, posIncrAtt.getPositionIncrement())

    def testStopListPositions(self):
        
        stopWords = ["good", "test", "analyzer"]
        stopWordsSet = HashSet()
        for stopWord in stopWords:
            stopWordsSet.add(stopWord)

        newStop = StopAnalyzer(Version.LUCENE_CURRENT, stopWordsSet)
        reader = StringReader("This is a good test of the english stop analyzer with positions")
        expectedIncr = [ 1,   1, 1,          3, 1,  1,      1,            2,   1]
        stream = newStop.tokenStream("test", reader)
        self.assert_(stream is not None)

        i = 0
        termAtt = stream.getAttribute(TermAttribute.class_)
        posIncrAtt = stream.addAttribute(PositionIncrementAttribute.class_)

        while stream.incrementToken():
            text = termAtt.term()
            self.assert_(text not in stopWordsSet)
            self.assertEqual(expectedIncr[i],
                             posIncrAtt.getPositionIncrement())
            i += 1


if __name__ == "__main__":
    import sys, lucene
    lucene.initVM()
    if '-loop' in sys.argv:
        sys.argv.remove('-loop')
        while True:
            try:
                main()
            except:
                pass
    else:
         main()