def test_任意文字パース():
s = parser.Source("あいうえお")
p1 = parser.anyChar()
p2 = parser.anyChar()
assert p1(s) == "あ"
assert p2(s) == "い"
def test_文字列の途中でeofは受理しない():
s = parser.Source("あいうえお")
p = parser.eof()
with pytest.raises(parser.ParserError,
match=r"Parse Error: unexpected EOF at line 1"):
result = p(s)
def test_連結パーサ():
s = parser.Source("1234")
p1 = parser.char("1")
p2 = parser.char("2")
assert (p1 >> p2)(s) == "12"
def test_選択パーサ():
s = parser.Source("1234")
# try backtrack
p1 = parser.string("13")
p2 = parser.string("12")
assert (p1 | p2)(s) == "12"
def test_指定文字パース():
s = parser.Source("123")
p1 = parser.char("1")
p2 = parser.char("2")
assert p1(s) == "1"
assert p2(s) == "2"
def test_オプションパーサ():
s = parser.Source("あいうえお")
p1 = parser.char("あ")
p2 = parser.char("う").option()
p3 = parser.char("い")
p4 = parser.char("う").option()
assert (p1 >> p2 >> p3 >> p4)(s) == "あいう"
def test_括弧の釣り合いを受理するパーサ():
s = parser.Source("((()))")
"""
parens ::= "(" parens? ")"
"""
def balanced_parens():
def parse(s):
r1 = parser.char("(")(s)
r2 = balanced_parens().option()(s)
r3 = parser.char(")")(s)
return r1 + r2 + r3
return parser.Parser(parse)
assert balanced_parens()(s) == "((()))"
def test_スペース():
import string
s = parser.Source(string.whitespace)
p1 = parser.whitespace().many1()
assert p1(s) == string.whitespace
def test_文字列の最後を受理するパーサ():
s = parser.Source("あいうえお")
p1 = parser.string("あいうえお")
p2 = parser.eof()
assert (p1 >> p2)(s) == "あいうえお"
def test_繰り返しパーサ():
s = parser.Source("123a")
p1 = parser.digit().many()
p2 = parser.alpha()
assert (p1 >> p2)(s) == "123a"
def test_回数繰り返しパーサ():
s = parser.Source("abcd")
p = parser.alpha().replicate(3)
assert p(s) == "abc"