redbot/cogs/trivia/schema.py
import itertools
import math
import re
from typing import Any, NoReturn
from schema import And, Const, Optional, Schema, SchemaError, SchemaMissingKeyError, Use
from redbot.core.i18n import Translator
__all__ = ("TRIVIA_LIST_SCHEMA", "format_schema_error")
T_ = Translator("Trivia", __file__)
KEY_ERROR_MSG_RE = re.compile(r"Key '(.+)' error:")
class SchemaErrorMessage(str):
def format(self, *args: Any, **kwargs: Any) -> str:
return T_(str(self))
def int_or_float(value: Any) -> float:
if not isinstance(value, (float, int)) or not math.isfinite(value):
raise TypeError("Value needs to be an integer or a finite float.")
return float(value)
def not_str(value: Any) -> float:
if isinstance(value, str):
raise TypeError("Value needs to not be a string.")
return value
_ = SchemaErrorMessage
NO_QUESTIONS_ERROR_MSG = _("The trivia list does not contain any questions.")
ALWAYS_MATCH = Optional(Use(lambda x: x))
MATCH_ALL_BUT_STR = Optional(Use(not_str))
TRIVIA_LIST_SCHEMA = Schema(
{
Optional("$schema"): And(str, error=_("{key} key must be a text value.")),
Optional("AUTHOR"): And(
str,
lambda text: 1 <= len(text) <= 1000,
error=_("{key} key must be a text value not longer than 1000 characters."),
),
Optional("DESCRIPTION"): And(
str,
lambda text: 1 <= len(text) <= 200,
error=_("{key} key must be a text value not longer than 200 characters."),
),
Optional("CONFIG"): And(
{
Optional("max_score"): And(
int,
lambda n: n >= 1,
error=_("{key} key in {parent_key} must be a positive integer."),
),
Optional("timeout"): And(
Use(int_or_float),
lambda n: n > 0.0,
error=_("{key} key in {parent_key} must be a positive number."),
),
Optional("delay"): And(
Use(int_or_float),
lambda n: n >= 4.0,
error=_(
"{key} key in {parent_key} must be a positive number"
" greater than or equal to 4."
),
),
Optional("bot_plays"): Const(
bool, error=_("{key} key in {parent_key} must be either true or false.")
),
Optional("reveal_answer"): Const(
bool, error=_("{key} key in {parent_key} must be either true or false.")
),
Optional("payout_multiplier"): And(
Use(int_or_float),
lambda n: n >= 0.0,
error=_("{key} key in {parent_key} must be a non-negative number."),
),
Optional("use_spoilers"): Const(
bool, error=_("{key} key in {parent_key} must be either true or false.")
),
# This matches any extra key and always fails validation
# for the purpose of better error messages.
ALWAYS_MATCH: And(
lambda __: False,
error=_("{key} is not a key that can be specified in {parent_key}."),
),
},
error=_("{key} should be a 'key: value' mapping."),
),
str: And(
[str, int, bool, float],
error=_("Value of question {key} is not a list of text values (answers)."),
),
# This matches any extra key and always fails validation
# for the purpose of better error messages.
MATCH_ALL_BUT_STR: And(
lambda __: False,
error=_("A key of question {key} is not a text value."),
),
},
error=_("A trivia list should be a 'key: value' mapping."),
)
def format_schema_error(exc: SchemaError) -> str:
if isinstance(exc, SchemaMissingKeyError):
return NO_QUESTIONS_ERROR_MSG.format()
# dict.fromkeys is used for de-duplication with order preservation
errors = {idx: msg for idx, msg in enumerate(exc.errors) if msg is not None}
if not errors:
return str(exc)
error_idx, error_msg_fmt = errors.popitem()
autos = dict.fromkeys(msg for msg in itertools.islice(exc.autos, error_idx) if msg is not None)
keys = [match[1] for msg in autos if (match := KEY_ERROR_MSG_RE.fullmatch(msg)) is not None]
key_count = len(keys)
if key_count == 2:
key = keys[-1]
parent_key = keys[-2]
elif key_count == 1:
key = keys[-1]
# should only happen for messages where this field isn't used
parent_key = "UNKNOWN"
else:
# should only happen for messages where neither of the fields are used
key = parent_key = "UNKNOWN"
return error_msg_fmt.format(key=repr(key), parent_key=repr(parent_key))