86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
from __future__ import annotations
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from collections.abc import Sequence
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from string import ascii_letters, digits, hexdigits
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from urllib.parse import quote as encode_uri_component
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ASCII_LETTERS_AND_DIGITS = ascii_letters + digits
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ENCODE_DEFAULT_CHARS = ";/?:@&=+$,-_.!~*'()#"
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ENCODE_COMPONENT_CHARS = "-_.!~*'()"
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encode_cache: dict[str, list[str]] = {}
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# Create a lookup array where anything but characters in `chars` string
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# and alphanumeric chars is percent-encoded.
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def get_encode_cache(exclude: str) -> Sequence[str]:
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if exclude in encode_cache:
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return encode_cache[exclude]
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cache: list[str] = []
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encode_cache[exclude] = cache
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for i in range(128):
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ch = chr(i)
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if ch in ASCII_LETTERS_AND_DIGITS:
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# always allow unencoded alphanumeric characters
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cache.append(ch)
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else:
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cache.append("%" + ("0" + hex(i)[2:].upper())[-2:])
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for i in range(len(exclude)):
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cache[ord(exclude[i])] = exclude[i]
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return cache
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# Encode unsafe characters with percent-encoding, skipping already
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# encoded sequences.
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#
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# - string - string to encode
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# - exclude - list of characters to ignore (in addition to a-zA-Z0-9)
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# - keepEscaped - don't encode '%' in a correct escape sequence (default: true)
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def encode(
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string: str, exclude: str = ENCODE_DEFAULT_CHARS, *, keep_escaped: bool = True
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) -> str:
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result = ""
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cache = get_encode_cache(exclude)
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l = len(string) # noqa: E741
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i = 0
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while i < l:
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code = ord(string[i])
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# %
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if keep_escaped and code == 0x25 and i + 2 < l:
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if all(c in hexdigits for c in string[i + 1 : i + 3]):
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result += string[i : i + 3]
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i += 2
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i += 1 # JS for loop statement3
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continue
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if code < 128:
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result += cache[code]
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i += 1 # JS for loop statement3
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continue
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if code >= 0xD800 and code <= 0xDFFF:
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if code >= 0xD800 and code <= 0xDBFF and i + 1 < l:
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next_code = ord(string[i + 1])
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if next_code >= 0xDC00 and next_code <= 0xDFFF:
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result += encode_uri_component(string[i] + string[i + 1])
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i += 1
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i += 1 # JS for loop statement3
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continue
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result += "%EF%BF%BD"
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i += 1 # JS for loop statement3
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continue
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result += encode_uri_component(string[i])
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i += 1 # JS for loop statement3
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return result
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