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use std::{borrow::Cow, iter::FusedIterator, ops::Range};
use bstr::{BStr, BString, ByteVec};
use crate::{
parse::{section::Key, Event},
value::{normalize, normalize_bstr, normalize_bstring},
};
/// A opaque type that represents a section body.
#[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Clone, Debug, Default)]
pub struct Body<'event>(pub(crate) crate::parse::section::Events<'event>);
/// Access
impl<'event> Body<'event> {
/// Retrieves the last matching value in a section with the given key, if present.
///
/// Note that we consider values without key separator `=` non-existing.
#[must_use]
pub fn value(&self, key: impl AsRef<str>) -> Option<Cow<'_, BStr>> {
self.value_implicit(key).flatten()
}
/// Retrieves the last matching value in a section with the given key, if present, and indicates an implicit value with `Some(None)`,
/// and a non-existing one as `None`
#[must_use]
pub fn value_implicit(&self, key: impl AsRef<str>) -> Option<Option<Cow<'_, BStr>>> {
let key = Key::from_str_unchecked(key.as_ref());
let (_key_range, range) = self.key_and_value_range_by(&key)?;
let range = match range {
None => return Some(None),
Some(range) => range,
};
let mut concatenated = BString::default();
for event in &self.0[range] {
match event {
Event::Value(v) => {
return Some(Some(normalize_bstr(v.as_ref())));
}
Event::ValueNotDone(v) => {
concatenated.push_str(v.as_ref());
}
Event::ValueDone(v) => {
concatenated.push_str(v.as_ref());
return Some(Some(normalize_bstring(concatenated)));
}
_ => (),
}
}
None
}
/// Retrieves all values that have the provided key name. This may return
/// an empty vec, which implies there were no values with the provided key.
#[must_use]
pub fn values(&self, key: impl AsRef<str>) -> Vec<Cow<'_, BStr>> {
let key = &Key::from_str_unchecked(key.as_ref());
let mut values = Vec::new();
let mut expect_value = false;
let mut concatenated_value = BString::default();
for event in &self.0 {
match event {
Event::SectionKey(event_key) if event_key == key => expect_value = true,
Event::Value(v) if expect_value => {
expect_value = false;
values.push(normalize_bstr(v.as_ref()));
}
Event::ValueNotDone(v) if expect_value => {
concatenated_value.push_str(v.as_ref());
}
Event::ValueDone(v) if expect_value => {
expect_value = false;
concatenated_value.push_str(v.as_ref());
values.push(normalize_bstring(std::mem::take(&mut concatenated_value)));
}
_ => (),
}
}
values
}
/// Returns an iterator visiting all keys in order.
pub fn keys(&self) -> impl Iterator<Item = &Key<'event>> {
self.0.iter().filter_map(|e| match e {
Event::SectionKey(k) => Some(k),
_ => None,
})
}
/// Returns true if the section contains the provided key.
#[must_use]
pub fn contains_key(&self, key: impl AsRef<str>) -> bool {
let key = &Key::from_str_unchecked(key.as_ref());
self.0.iter().any(|e| {
matches!(e,
Event::SectionKey(k) if k == key
)
})
}
/// Returns the number of values in the section.
#[must_use]
pub fn num_values(&self) -> usize {
self.0.iter().filter(|e| matches!(e, Event::SectionKey(_))).count()
}
/// Returns if the section is empty.
/// Note that this may count whitespace, see [`num_values()`][Self::num_values()] for
/// another way to determine semantic emptiness.
#[must_use]
pub fn is_void(&self) -> bool {
self.0.is_empty()
}
}
impl<'event> Body<'event> {
pub(crate) fn as_ref(&self) -> &[Event<'_>] {
&self.0
}
/// Returns the the range containing the value events for the `key`, with value range being `None` if there is no key-value separator
/// and only a 'fake' Value event with an empty string in side.
/// If the value is not found, `None` is returned.
pub(crate) fn key_and_value_range_by(&self, key: &Key<'_>) -> Option<(Range<usize>, Option<Range<usize>>)> {
let mut value_range = Range::default();
let mut key_start = None;
for (i, e) in self.0.iter().enumerate().rev() {
match e {
Event::SectionKey(k) => {
if k == key {
key_start = Some(i);
break;
}
value_range = Range::default();
}
Event::Value(_) => {
(value_range.start, value_range.end) = (i, i);
}
Event::ValueNotDone(_) | Event::ValueDone(_) => {
if value_range.end == 0 {
value_range.end = i
} else {
value_range.start = i
};
}
_ => (),
}
}
key_start.map(|key_start| {
// value end needs to be offset by one so that the last value's index
// is included in the range
let value_range = value_range.start..value_range.end + 1;
let key_range = key_start..value_range.end;
(key_range, (value_range.start != key_start + 1).then_some(value_range))
})
}
}
/// An owning iterator of a section body. Created by [`Body::into_iter`], yielding
/// un-normalized (`key`, `value`) pairs.
// TODO: tests
pub struct BodyIter<'event>(smallvec::IntoIter<[Event<'event>; 64]>);
impl<'event> IntoIterator for Body<'event> {
type Item = (Key<'event>, Cow<'event, BStr>);
type IntoIter = BodyIter<'event>;
fn into_iter(self) -> Self::IntoIter {
BodyIter(self.0.into_iter())
}
}
impl<'event> Iterator for BodyIter<'event> {
type Item = (Key<'event>, Cow<'event, BStr>);
fn next(&mut self) -> Option<Self::Item> {
let mut key = None;
let mut partial_value = BString::default();
let mut value = None;
for event in self.0.by_ref() {
match event {
Event::SectionKey(k) => key = Some(k),
Event::Value(v) => {
value = Some(v);
break;
}
Event::ValueNotDone(v) => partial_value.push_str(v.as_ref()),
Event::ValueDone(v) => {
partial_value.push_str(v.as_ref());
value = Some(partial_value.into());
break;
}
_ => (),
}
}
key.zip(value.map(normalize))
}
}
impl FusedIterator for BodyIter<'_> {}
|
