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use std::{borrow::Cow, ops::Deref};
use bstr::{BStr, BString, ByteSlice};
use smallvec::SmallVec;
use crate::{
file,
file::{Metadata, Section, SectionMut},
parse,
parse::{section, Event},
};
pub(crate) mod body;
pub use body::{Body, BodyIter};
use gix_features::threading::OwnShared;
use crate::file::{
write::{extract_newline, platform_newline},
SectionId,
};
impl<'a> Deref for Section<'a> {
type Target = Body<'a>;
fn deref(&self) -> &Self::Target {
&self.body
}
}
/// Instantiation and conversion
impl<'a> Section<'a> {
/// Create a new section with the given `name` and optional, `subsection`, `meta`-data and an empty body.
pub fn new(
name: impl Into<Cow<'a, str>>,
subsection: impl Into<Option<Cow<'a, BStr>>>,
meta: impl Into<OwnShared<file::Metadata>>,
) -> Result<Self, parse::section::header::Error> {
Ok(Section {
header: parse::section::Header::new(name, subsection)?,
body: Default::default(),
meta: meta.into(),
id: SectionId::default(),
})
}
}
/// Access
impl<'a> Section<'a> {
/// Return our header.
pub fn header(&self) -> §ion::Header<'a> {
&self.header
}
/// Return the unique `id` of the section, for use with the `*_by_id()` family of methods
/// in [gix_config::File][crate::File].
pub fn id(&self) -> SectionId {
self.id
}
/// Return our body, containing all keys and values.
pub fn body(&self) -> &Body<'a> {
&self.body
}
/// 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()
}
/// Stream ourselves to the given `out`, in order to reproduce this section mostly losslessly
/// as it was parsed.
pub fn write_to(&self, mut out: impl std::io::Write) -> std::io::Result<()> {
self.header.write_to(&mut out)?;
if self.body.0.is_empty() {
return Ok(());
}
let nl = self
.body
.as_ref()
.iter()
.find_map(extract_newline)
.unwrap_or_else(|| platform_newline());
if !self
.body
.as_ref()
.iter()
.take_while(|e| !matches!(e, Event::SectionKey(_)))
.any(|e| e.to_bstr_lossy().contains_str(nl))
{
out.write_all(nl)?;
}
let mut saw_newline_after_value = true;
let mut in_key_value_pair = false;
for (idx, event) in self.body.as_ref().iter().enumerate() {
match event {
Event::SectionKey(_) => {
if !saw_newline_after_value {
out.write_all(nl)?;
}
saw_newline_after_value = false;
in_key_value_pair = true;
}
Event::Newline(_) if !in_key_value_pair => {
saw_newline_after_value = true;
}
Event::Value(_) | Event::ValueDone(_) => {
in_key_value_pair = false;
}
_ => {}
}
event.write_to(&mut out)?;
if let Event::ValueNotDone(_) = event {
if self
.body
.0
.get(idx + 1)
.filter(|e| matches!(e, Event::Newline(_)))
.is_none()
{
out.write_all(nl)?;
}
}
}
Ok(())
}
/// Return additional information about this sections origin.
pub fn meta(&self) -> &Metadata {
&self.meta
}
/// Returns a mutable version of this section for adjustment of values.
pub fn to_mut(&mut self, newline: SmallVec<[u8; 2]>) -> SectionMut<'_, 'a> {
SectionMut::new(self, newline)
}
}
|
