use std::borrow::Cow; use bstr::BStr; use crate::{    file,    file::{mutable::section::SectionMut, Index, Size},    lookup,    parse::section,}; /// An intermediate representation of a mutable value obtained from a [`File`][crate::File].#[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]pub struct ValueMut<'borrow, 'lookup, 'event> {    pub(crate) section: SectionMut<'borrow, 'event>,    pub(crate) key: section::Key<'lookup>,    pub(crate) index: Index,    pub(crate) size: Size,} impl<'borrow, 'lookup, 'event> ValueMut<'borrow, 'lookup, 'event> {    /// Returns the actual value. This is computed each time this is called    /// requiring an allocation for multi-line values.    pub fn get(&self) -> Result<Cow<'_, BStr>, lookup::existing::Error> {        self.section.get(&self.key, self.index, self.index + self.size)    }     /// Update the value to the provided one. This modifies the value such that    /// the Value event(s) are replaced with a single new event containing the    /// new value.    pub fn set_string(&mut self, input: impl AsRef<str>) {        self.set(input.as_ref());    }     /// Update the value to the provided one. This modifies the value such that    /// the Value event(s) are replaced with a single new event containing the    /// new value.    pub fn set<'a>(&mut self, input: impl Into<&'a BStr>) {        if self.size.0 > 0 {            self.section.delete(self.index, self.index + self.size);        }        self.size = self.section.set_internal(self.index, self.key.to_owned(), input.into());    }     /// Removes the value. Does nothing when called multiple times in    /// succession.    pub fn delete(&mut self) {        if self.size.0 > 0 {            self.section.delete(self.index, self.index + self.size);            self.size = Size(0);        }    }     /// Return the section containing the value.    pub fn section(&self) -> &file::Section<'event> {        &self.section    }     /// Convert this value into its owning mutable section.    pub fn into_section_mut(self) -> file::SectionMut<'borrow, 'event> {        self.section    }}