def test_take():
mg = _metagrammar()
gstring = """
paren = "(" <(~")" Any)+>:tag ")" -> tag
""".strip()
rg = mg.parse(gstring, context=p.parser_context())
paren = rg.ruledict["paren"]
out, i = paren.accept("(hi)", 0, p.parser_context())
assert out == "hi"
def test_action():
mg = _metagrammar()
gstring = """
x = !(None)
""".strip()
rg = mg.parse(gstring, context=p.parser_context())
x = rg.ruledict["x"]
assert type(x) is p.Do
assert x.source == "None"
def test_metaparse_regex():
mg = _metagrammar()
print(mg.ruledict)
assert "ws" in mg.context
gstring = p.Document("""
x = /foo(?P<num>[0-9]+)/
""".strip())
rg = mg.parse(gstring, context=p.parser_context())
assert len(rg.ruledict) == 1
rule = rg.ruledict["x"]
assert type(rule) is p.Regex
assert rule.match == "foo(?P<num>[0-9]+)"
xc = p.ParserContext()
out, i = rule.accept("foo123", 0, xc)
assert xc["num"] == "123"
assert out == "foo123"
assert i == 6
def test_repeat():
mg = _metagrammar()
gstring = """
y = 'b'{3}
z = 'z'{4,}
x = 'a'{2,5}
""".strip()
rg = mg.parse(gstring, context=p.parser_context())
x = rg.ruledict["x"]
assert type(x) is p.Repeat
assert x.mintimes == 2
assert x.maxtimes == 5
y = rg.ruledict["y"]
assert type(y) is p.Repeat
assert y.mintimes == 3
assert y.maxtimes == 3
z = rg.ruledict["z"]
assert type(z) is p.Repeat
assert z.mintimes == 4
assert z.maxtimes is None