def mk_first_match_rule(c):
if c == empty:
cls = FirstEqualRule
elif is_iterable(c):
if len(c) == 1:
cls = FirstEqualRule
else:
cls = FirstEqualAnyRule
elif callable(c):
cls = FirstEqualPredRule
c = match_first_predicate(c)
else:
raise Err("Don't know how to make match from {}", c)
return cls(c)
def match_iterable(name, pat, conv, options):
if not cor.is_iterable(pat):
raise Err("Don't know what to do with {}", seq)
seq = [x for x in pat] if isinstance(pat, str) else pat
@rule(name, options)
def fn(src, pos):
try:
v = src[pos]
except IndexError as e:
v = empty
if v in seq:
v = conv(v)
return (1, v) if v != nomatch else _nomatch_res
else:
return _nomatch_res
return fn
def mk_rule(src):
if isinstance(src, Rule):
return src
if is_iterable(src):
return mk_first_match_rule(src)
raise Err("Can't make rule from {}", src)
def __radd__(self, other):
if not is_str(other) and is_iterable(other):
return other.__add__((self,))
return mk_rule_seq(other, self, self._next_child_name)
