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