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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
}
}
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