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import dataclasses, re, typing
def _tokens(s: str, token: str) -> typing.List[int]:
backslash = False
tokens = []
for i, c in enumerate(s):
if not backslash:
if c == token:
tokens.append(i)
elif c == "\\":
backslash = True
else:
backslash = False
return tokens
class Sed(object):
type: str
def match(self, s: str) -> typing.Optional[str]:
return None
@dataclasses.dataclass
class SedReplace(Sed):
type: str
pattern: typing.Pattern
replace: str
count: int
def match(self, s):
replace_copy = self.replace
for token in reversed(_tokens(replace_copy, "&")):
replace_copy = replace_copy[:token]+r"\g<0>"+replace_copy[token+1:]
s = re.sub(self.pattern, replace_copy, s, self.count)
return s
@dataclasses.dataclass
class SedMatch(Sed):
type: str
pattern: typing.Pattern
def match(self, s):
match = self.pattern.search(s)
if match:
return match.group(0)
return None
def _sed_split(s: str) -> typing.List[str]:
tokens = _tokens(s, "/")
if tokens and (not tokens[-1] == (len(s)-1)):
tokens.append(len(s))
last = 0
out = []
for i in tokens:
out.append(s[last:i].replace("\\/", "/"))
last = i+1
return out
def _sed_flags(s: str) -> typing.Tuple[int, int]:
count = 1
re_flags = 0
if "g" in s:
count = 0
if "i" in s:
re_flags |= re.I
return count, re_flags
def parse(sed_s: str) -> typing.Optional[Sed]:
type, pattern, *args = _sed_split(sed_s)
if type == "s":
replace, *args = args
count, flags = _sed_flags((args or [""])[0])
pattern_re = re.compile(pattern, flags)
return SedReplace(type, pattern_re, replace, count)
elif type == "m":
count, flags = _sed_flags((args or [""])[0])
return SedMatch(type, re.compile(pattern, flags))
return None
def sed(sed_obj: Sed, s: str) -> typing.Optional[str]:
out = sed_obj.match(s)
return out
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