use std::{borrow::Cow, convert::TryFrom, fmt::Display}; use bstr::{BStr, BString, ByteSlice}; use crate::{value, Boolean}; fn bool_err(input: impl Into<BString>) -> value::Error {    value::Error::new(        "Booleans need to be 'no', 'off', 'false', '' or 'yes', 'on', 'true' or any number",        input,    )} impl TryFrom<&BStr> for Boolean {    type Error = value::Error;     fn try_from(value: &BStr) -> Result<Self, Self::Error> {        if parse_true(value) {            Ok(Boolean(true))        } else if parse_false(value) {            Ok(Boolean(false))        } else {            use std::str::FromStr;            if let Some(integer) = value.to_str().ok().and_then(|s| i64::from_str(s).ok()) {                Ok(Boolean(integer != 0))            } else {                Err(bool_err(value))            }        }    }} impl Boolean {    /// Return true if the boolean is a true value.    ///    /// Note that the inner value is accessible directly as well.    pub fn is_true(self) -> bool {        self.0    }} impl TryFrom<Cow<'_, BStr>> for Boolean {    type Error = value::Error;    fn try_from(c: Cow<'_, BStr>) -> Result<Self, Self::Error> {        Self::try_from(c.as_ref())    }} impl Display for Boolean {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        self.0.fmt(f)    }} impl From<Boolean> for bool {    fn from(b: Boolean) -> Self {        b.0    }} #[cfg(feature = "serde")]impl serde::Serialize for Boolean {    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>    where        S: serde::Serializer,    {        serializer.serialize_bool(self.0)    }} fn parse_true(value: &BStr) -> bool {    value.eq_ignore_ascii_case(b"yes")        || value.eq_ignore_ascii_case(b"on")        || value.eq_ignore_ascii_case(b"true")        || value.is_empty()} fn parse_false(value: &BStr) -> bool {    value.eq_ignore_ascii_case(b"no") || value.eq_ignore_ascii_case(b"off") || value.eq_ignore_ascii_case(b"false")}