# The contents of this file are subject to the Mozilla Public License
# (MPL) Version 1.1 (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.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS"
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
# the License for the specific language governing rights and
# limitations under the License.
#
# The Original Code is LEPL (http://www.acooke.org/lepl)
# The Initial Developer of the Original Code is Andrew Cooke.
# Portions created by the Initial Developer are Copyright (C) 2009-2010
# Andrew Cooke (andrew@acooke.org). All Rights Reserved.
#
# Alternatively, the contents of this file may be used under the terms
# of the LGPL license (the GNU Lesser General Public License,
# http://www.gnu.org/licenses/lgpl.html), in which case the provisions
# of the LGPL License are applicable instead of those above.
#
# If you wish to allow use of your version of this file only under the
# terms of the LGPL License and not to allow others to use your version
# of this file under the MPL, indicate your decision by deleting the
# provisions above and replace them with the notice and other provisions
# required by the LGPL License.  If you do not delete the provisions
# above, a recipient may use your version of this file under either the
# MPL or the LGPL License.

'''
Tests for the lepl.lexer.lines.stream module.
'''

#from logging import basicConfig, DEBUG
from unittest import TestCase

from lepl.lexer.matchers import Token
from lepl.matchers.core import Regexp, Literal, Any
from lepl.lexer.lines.matchers import Line, LineStart, LineEnd, NO_BLOCKS

class LineTest(TestCase):
    
    # no longer a bad config!
    def test_bad_config(self):
        #basicConfig(level=DEBUG)
        text = Token('[^\n\r]+')
        quoted = Regexp("'[^']'")
        line = Line(text(quoted))
        line.config.lines()
        parser = line.get_parse_string()
        assert parser("'a'") == ["'a'"]
            
    def test_line(self):
        #basicConfig(level=DEBUG)
        text = Token('[^\n\r]+')
        quoted = Regexp("'[^']'")
        line = Line(text(quoted))
        line.config.lines(block_start=0)
        parser = line.get_parse_string()
        assert parser("'a'") == ["'a'"]
        
    def test_offset(self):
        #basicConfig(level=DEBUG)
        text = Token('[^\n\r]+')
        line = Line(text(~Literal('aa') & Regexp('.*')))
        line.config.lines(block_start=0)
        parser = line.get_parse_string()
        assert parser('aabc') == ['bc']
        # what happens with an empty match?
        check = ~Literal('aa') & Regexp('.*')
        check.config.no_full_first_match()
        assert check.parse('aa') == ['']
        assert parser('aa') == ['']
        
#    def test_single_line(self):
#        #basicConfig(level=DEBUG)
#        line = DfaRegexp('(*SOL)[a-z]*(*EOL)')
#        line.config.lines()
#        parser = line.get_parse_string()
#        assert parser('abc') == ['abc']
        
    def test_tabs(self):
        '''
        Use block_policy here so that the regexp parser that excludes SOL
        and EOL is used; otherwise Any()[:] matches those and we end up
        with a single monster token.
        '''
        line = LineStart() & Token(Any()) & LineEnd()
        line.config.lines(tabsize=8, block_start=NO_BLOCKS, block_policy=0).trace_stack(True)
        result = line.parse('a')
        assert result == ['', 'a'], result
        result = line.parse('\ta')
        assert result == ['        ', 'a'], result
        line.config.lines(tabsize=None, block_start=NO_BLOCKS, block_policy=0)
        result = line.parse('\ta')
        assert result == ['\t', 'a'], result
        line.config.lines(block_policy=0, block_start=NO_BLOCKS)
        result = line.parse('\ta')
        assert result == ['        ', 'a'], result