#!/usr/bin/env python2
#
# Copyright 2011-2016 Google Inc.
#
# 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.

import re
import unittest

import sre_yield


class AnchorTest(unittest.TestCase):
    """Test that allowed anchors in allowed positions work."""

    def testAnchorsCaret(self):
        parsed = sre_yield.Values('^[ab]')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsA(self):
        parsed = sre_yield.Values('\\A[ab]')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsMultiCaret(self):
        parsed = sre_yield.Values('^(\\b^([ab]))')
        self.assertEqual(['a', 'b'], list(parsed))

    def testParseErrorInMiddle(self):
        self.assertRaises(sre_yield.ParseError, sre_yield.Values, 'a\\bb')
        self.assertRaises(sre_yield.ParseError, sre_yield.Values, 'a^b')
        self.assertRaises(sre_yield.ParseError, sre_yield.Values, 'a$b')

    def testParseErrorNotBoundary(self):
        self.assertRaises(sre_yield.ParseError, sre_yield.Values, '\\Ba')
        self.assertRaises(sre_yield.ParseError, sre_yield.Values, 'a\\B')
        self.assertRaises(sre_yield.ParseError, sre_yield.Values, 'a\\Bb')

    def testAnchorsDollar(self):
        parsed = sre_yield.Values('[ab]$')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsZ(self):
        parsed = sre_yield.Values('[ab]\\Z')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsCombined(self):
        parsed = sre_yield.Values('^[ab]$')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsBoundary(self):
        parsed = sre_yield.Values('ab\\b')
        self.assertEqual(['ab'], list(parsed))
        parsed = sre_yield.Values('\\bab')
        self.assertEqual(['ab'], list(parsed))
        parsed = sre_yield.Values('\\bab\\b')
        self.assertEqual(['ab'], list(parsed))

    def testAnchorsRepeated(self):
        parsed = sre_yield.Values(r'^\b^[ab]')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsRepeated(self):
        parsed = sre_yield.Values(r'[ab]$\b$')
        self.assertEqual(['a', 'b'], list(parsed))

    def testAnchorsEmptyString(self):
        parsed = sre_yield.Values(r'^^^$\b$')
        self.assertEqual([''], list(parsed))


if __name__ == '__main__':
    unittest.main()
