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use std::{borrow::Cow, fmt::Display};
use bstr::{BStr, BString};
use crate::parse::Event;
impl Event<'_> {
/// Serialize this type into a `BString` for convenience.
///
/// Note that `to_string()` can also be used, but might not be lossless.
#[must_use]
pub fn to_bstring(&self) -> BString {
let mut buf = Vec::new();
self.write_to(&mut buf).expect("io error impossible");
buf.into()
}
/// Turn ourselves into the text we represent, lossy.
///
/// Note that this will be partial in case of `ValueNotDone` which doesn't include the backslash, and `SectionHeader` will only
/// provide their name, lacking the sub-section name.
pub fn to_bstr_lossy(&self) -> &BStr {
match self {
Self::ValueNotDone(e) | Self::Whitespace(e) | Self::Newline(e) | Self::Value(e) | Self::ValueDone(e) => {
e.as_ref()
}
Self::KeyValueSeparator => "=".into(),
Self::SectionKey(k) => k.0.as_ref(),
Self::SectionHeader(h) => h.name.0.as_ref(),
Self::Comment(c) => c.text.as_ref(),
}
}
/// Stream ourselves to the given `out`, in order to reproduce this event mostly losslessly
/// as it was parsed.
pub fn write_to(&self, mut out: impl std::io::Write) -> std::io::Result<()> {
match self {
Self::ValueNotDone(e) => {
out.write_all(e.as_ref())?;
out.write_all(b"\\")
}
Self::Whitespace(e) | Self::Newline(e) | Self::Value(e) | Self::ValueDone(e) => out.write_all(e.as_ref()),
Self::KeyValueSeparator => out.write_all(b"="),
Self::SectionKey(k) => out.write_all(k.0.as_ref()),
Self::SectionHeader(h) => h.write_to(&mut out),
Self::Comment(c) => c.write_to(&mut out),
}
}
/// Turn this instance into a fully owned one with `'static` lifetime.
#[must_use]
pub fn to_owned(&self) -> Event<'static> {
match self {
Event::Comment(e) => Event::Comment(e.to_owned()),
Event::SectionHeader(e) => Event::SectionHeader(e.to_owned()),
Event::SectionKey(e) => Event::SectionKey(e.to_owned()),
Event::Value(e) => Event::Value(Cow::Owned(e.clone().into_owned())),
Event::ValueNotDone(e) => Event::ValueNotDone(Cow::Owned(e.clone().into_owned())),
Event::ValueDone(e) => Event::ValueDone(Cow::Owned(e.clone().into_owned())),
Event::Newline(e) => Event::Newline(Cow::Owned(e.clone().into_owned())),
Event::Whitespace(e) => Event::Whitespace(Cow::Owned(e.clone().into_owned())),
Event::KeyValueSeparator => Event::KeyValueSeparator,
}
}
}
impl Display for Event<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
Display::fmt(&self.to_bstring(), f)
}
}
impl From<Event<'_>> for BString {
fn from(event: Event<'_>) -> Self {
event.into()
}
}
impl From<&Event<'_>> for BString {
fn from(event: &Event<'_>) -> Self {
event.to_bstring()
}
}
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