# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
#
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# modification, are permitted provided that the following conditions
# are met:
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
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#
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"""Unit tests for common.py."""

import unittest

from common import CarriageReturnProcessor


# FIXME: The unit tests for the cpp, text, and common processors should
#        share supporting test code. This can include, for example, the
#        mock style error handling code and the code to check that all
#        of a processor's categories are covered by the unit tests.
#        Such shared code can be located in a shared test file, perhaps
#        even this file.
class CarriageReturnProcessorTest(unittest.TestCase):

    """Tests check_no_carriage_return()."""

    _category = "whitespace/carriage_return"
    _confidence = 1
    _expected_message = ("One or more unexpected \\r (^M) found; "
                         "better to use only a \\n")

    def setUp(self):
        self._style_errors = [] # The list of accumulated style errors.

    def _mock_style_error_handler(self, line_number, category, confidence,
                                  message):
        """Append the error information to the list of style errors."""
        error = (line_number, category, confidence, message)
        self._style_errors.append(error)

    def assert_carriage_return(self, input_lines, expected_lines, error_lines):
        """Process the given line and assert that the result is correct."""
        handle_style_error = self._mock_style_error_handler

        processor = CarriageReturnProcessor(handle_style_error)
        output_lines = processor.process(input_lines)

        # Check both the return value and error messages.
        self.assertEquals(output_lines, expected_lines)

        expected_errors = [(line_number, self._category, self._confidence,
                            self._expected_message)
                           for line_number in error_lines]
        self.assertEquals(self._style_errors, expected_errors)

    def test_ends_with_carriage(self):
        self.assert_carriage_return(["carriage return\r"],
                                    ["carriage return"],
                                    [1])

    def test_ends_with_nothing(self):
        self.assert_carriage_return(["no carriage return"],
                                    ["no carriage return"],
                                    [])

    def test_ends_with_newline(self):
        self.assert_carriage_return(["no carriage return\n"],
                                    ["no carriage return\n"],
                                    [])

    def test_carriage_in_middle(self):
        # The CarriageReturnProcessor checks only the final character
        # of each line.
        self.assert_carriage_return(["carriage\r in a string"],
                                    ["carriage\r in a string"],
                                    [])

    def test_multiple_errors(self):
        self.assert_carriage_return(["line1", "line2\r", "line3\r"],
                                    ["line1", "line2", "line3"],
                                    [2, 3])
