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# String encodings and numeric representations
import binascii
import re
from typing import (
Any,
AnyStr,
)
from eth_typing import (
HexStr,
)
from .types import (
is_string,
is_text,
)
_HEX_REGEXP = re.compile("(0[xX])?[0-9a-fA-F]*")
def decode_hex(value: str) -> bytes:
if not is_text(value):
raise TypeError("Value must be an instance of str")
non_prefixed = remove_0x_prefix(HexStr(value))
# unhexlify will only accept bytes type someday
ascii_hex = non_prefixed.encode("ascii")
return binascii.unhexlify(ascii_hex)
def encode_hex(value: AnyStr) -> HexStr:
if not is_string(value):
raise TypeError("Value must be an instance of str or unicode")
elif isinstance(value, (bytes, bytearray)):
ascii_bytes = value
else:
ascii_bytes = value.encode("ascii")
binary_hex = binascii.hexlify(ascii_bytes)
return add_0x_prefix(HexStr(binary_hex.decode("ascii")))
def is_0x_prefixed(value: str) -> bool:
if not is_text(value):
raise TypeError(
f"is_0x_prefixed requires text typed arguments. Got: {repr(value)}"
)
return value.startswith(("0x", "0X"))
def remove_0x_prefix(value: HexStr) -> HexStr:
if is_0x_prefixed(value):
return HexStr(value[2:])
return value
def add_0x_prefix(value: HexStr) -> HexStr:
if is_0x_prefixed(value):
return value
return HexStr("0x" + value)
def is_hexstr(value: Any) -> bool:
if not is_text(value) or not value:
return False
return _HEX_REGEXP.fullmatch(value) is not None
def is_hex(value: Any) -> bool:
if not is_text(value):
raise TypeError(f"is_hex requires text typed arguments. Got: {repr(value)}")
if not value:
return False
return _HEX_REGEXP.fullmatch(value) is not None
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