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def tokenize(line: str, retain_curlies = False) -> list[str]:
cur: str = ""
result: list[str] = []
is_py_expr = False
is_string = False
idx = 0
while idx < len(line):
c = line[idx]
if not is_py_expr and c == "$":
is_py_expr = True
if retain_curlies:
cur += "${"
idx += 1
elif is_py_expr and c == "$":
raise Exception("Unexpected start of python expr while already parsing a python expression:\n" + line)
elif not is_py_expr and c == "}":
raise Exception("Unexpected end of python expr while not parsing a python expression:\n" + line)
elif is_py_expr and c == "}":
is_py_expr = False
if retain_curlies:
cur += c
result.append(cur)
cur = ""
elif is_py_expr:
cur += c
elif not is_string and c == "\"":
cur += "\""
is_string = True
elif is_string and c == "\"":
cur += "\""
is_string = False
result.append(cur)
cur = ""
elif is_string:
cur += c
elif c == " " or c == "\t":
result.append(cur)
cur = ""
else:
cur += c
idx += 1
if len(cur) > 0:
result.append(cur)
return [r for r in result if r != ""]
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