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|
use std::{borrow::Cow, fmt::Display};
use bstr::BStr;
use smallvec::SmallVec;
use crate::parse::{Event, Section};
///
pub mod header;
pub(crate) mod unvalidated;
/// A container for events, avoiding heap allocations in typical files.
pub type Events<'a> = SmallVec<[Event<'a>; 64]>;
/// A parsed section header, containing a name and optionally a subsection name.
#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub struct Header<'a> {
/// The name of the header.
pub(crate) name: Name<'a>,
/// The separator used to determine if the section contains a subsection.
/// This is either a period `.` or a string of whitespace. Note that
/// reconstruction of subsection format is dependent on this value. If this
/// is all whitespace, then the subsection name needs to be surrounded by
/// quotes to have perfect reconstruction.
pub(crate) separator: Option<Cow<'a, BStr>>,
pub(crate) subsection_name: Option<Cow<'a, BStr>>,
}
impl Section<'_> {
/// Turn this instance into a fully owned one with `'static` lifetime.
#[must_use]
pub fn to_owned(&self) -> Section<'static> {
Section {
header: self.header.to_owned(),
events: self.events.iter().map(Event::to_owned).collect(),
}
}
}
impl Display for Section<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.header)?;
for event in &self.events {
event.fmt(f)?;
}
Ok(())
}
}
mod types {
macro_rules! generate_case_insensitive {
($name:ident, $module:ident, $err_doc:literal, $validate:ident, $cow_inner_type:ty, $comment:literal) => {
///
pub mod $module {
/// The error returned when `TryFrom` is invoked to create an instance.
#[derive(Debug, thiserror::Error, Copy, Clone)]
#[error($err_doc)]
pub struct Error;
}
#[doc = $comment]
#[derive(Clone, Eq, Debug, Default)]
pub struct $name<'a>(pub(crate) std::borrow::Cow<'a, $cow_inner_type>);
impl<'a> $name<'a> {
pub(crate) fn from_str_unchecked(s: &'a str) -> Self {
$name(std::borrow::Cow::Borrowed(s.into()))
}
/// Turn this instance into a fully owned one with `'static` lifetime.
#[must_use]
pub fn to_owned(&self) -> $name<'static> {
$name(std::borrow::Cow::Owned(self.0.clone().into_owned()))
}
}
impl PartialEq for $name<'_> {
fn eq(&self, other: &Self) -> bool {
self.0.eq_ignore_ascii_case(&other.0)
}
}
impl std::fmt::Display for $name<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.0.fmt(f)
}
}
impl PartialOrd for $name<'_> {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
self.cmp(other).into()
}
}
impl Ord for $name<'_> {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
let a = self.0.iter().map(|c| c.to_ascii_lowercase());
let b = other.0.iter().map(|c| c.to_ascii_lowercase());
a.cmp(b)
}
}
impl std::hash::Hash for $name<'_> {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
for b in self.0.iter() {
b.to_ascii_lowercase().hash(state);
}
}
}
impl<'a> std::convert::TryFrom<&'a str> for $name<'a> {
type Error = $module::Error;
fn try_from(s: &'a str) -> Result<Self, Self::Error> {
Self::try_from(std::borrow::Cow::Borrowed(bstr::ByteSlice::as_bstr(s.as_bytes())))
}
}
impl<'a> std::convert::TryFrom<String> for $name<'a> {
type Error = $module::Error;
fn try_from(s: String) -> Result<Self, Self::Error> {
Self::try_from(std::borrow::Cow::Owned(bstr::BString::from(s)))
}
}
impl<'a> std::convert::TryFrom<std::borrow::Cow<'a, bstr::BStr>> for $name<'a> {
type Error = $module::Error;
fn try_from(s: std::borrow::Cow<'a, bstr::BStr>) -> Result<Self, Self::Error> {
if $validate(s.as_ref()) {
Ok(Self(s))
} else {
Err($module::Error)
}
}
}
impl<'a> std::ops::Deref for $name<'a> {
type Target = $cow_inner_type;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<'a> std::convert::AsRef<str> for $name<'a> {
fn as_ref(&self) -> &str {
std::str::from_utf8(self.0.as_ref()).expect("only valid UTF8 makes it through our validation")
}
}
};
}
fn is_valid_name(n: &bstr::BStr) -> bool {
!n.is_empty() && n.iter().all(|b| b.is_ascii_alphanumeric() || *b == b'-')
}
fn is_valid_key(n: &bstr::BStr) -> bool {
is_valid_name(n) && n[0].is_ascii_alphabetic()
}
generate_case_insensitive!(
Name,
name,
"Valid names consist of alphanumeric characters or dashes.",
is_valid_name,
bstr::BStr,
"Wrapper struct for section header names, like `remote`, since these are case-insensitive."
);
generate_case_insensitive!(
Key,
key,
"Valid keys consist alphanumeric characters or dashes, starting with an alphabetic character.",
is_valid_key,
bstr::BStr,
"Wrapper struct for key names, like `path` in `include.path`, since keys are case-insensitive."
);
}
pub use types::{key, name, Key, Name};
pub(crate) fn into_cow_bstr(c: Cow<'_, str>) -> Cow<'_, BStr> {
match c {
Cow::Borrowed(s) => Cow::Borrowed(s.into()),
Cow::Owned(s) => Cow::Owned(s.into()),
}
}
|
