88 lines
2.4 KiB
Python
88 lines
2.4 KiB
Python
# -*- coding: utf-8 -*-
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#######################################################################
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# Name: test_sequence_params
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# Purpose: Test Sequence expression parameters.
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# Author: Igor R. Dejanović <igor DOT dejanovic AT gmail DOT com>
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# Copyright: (c) 2014 Igor R. Dejanović <igor DOT dejanovic AT gmail DOT com>
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# License: MIT License
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#######################################################################
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from __future__ import unicode_literals
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import pytest
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from arpeggio import ParserPython, NoMatch, Sequence
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def test_skipws():
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"""
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skipws may be defined per Sequence.
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"""
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def grammar():
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return Sequence("one", "two", "three"), "four"
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parser = ParserPython(grammar)
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# By default, skipws is True and whitespaces will be skipped.
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parser.parse("one two three four")
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def grammar():
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return Sequence("one", "two", "three", skipws=False), "four"
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parser = ParserPython(grammar)
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# If we disable skipws for sequence only then whitespace
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# skipping should not be done inside sequence.
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with pytest.raises(NoMatch):
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parser.parse("one two three four")
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# But it will be done outside of it
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parser.parse("onetwothree four")
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def test_ws():
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"""
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ws can be changed per Sequence.
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"""
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def grammar():
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return Sequence("one", "two", "three"), "four"
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parser = ParserPython(grammar)
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# By default, ws consists of space, tab and newline
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# So this should parse.
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parser.parse("""one
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two three four""")
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def grammar():
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return Sequence("one", "two", "three", ws=' '), "four"
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parser = ParserPython(grammar)
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# If we change ws per sequence and set it to space only
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# given input will raise exception
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with pytest.raises(NoMatch):
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parser.parse("""one
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two three four""")
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# But ws will be default outside of sequence
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parser.parse("""one two three
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four""")
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# Test for ws with more than one char.
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def grammar():
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return Sequence("one", "two", "three", ws=' \t'), "four"
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parser = ParserPython(grammar)
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# If we change ws per sequence and set it to spaces and tabs
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# given input will raise exception
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with pytest.raises(NoMatch):
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parser.parse("one two \nthree \t four")
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# But ws will be default outside of sequence
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parser.parse("one two three \n\t four")
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# Inside sequence a spaces and tabs will be skipped
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parser.parse("one \t two\t three \nfour")
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