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|
//! Bindings to libgit2's raw `git_strarray` type
use std::iter::FusedIterator;
use std::ops::Range;
use std::str;
use crate::raw;
use crate::util::Binding;
/// A string array structure used by libgit2
///
/// Some APIs return arrays of strings which originate from libgit2. This
/// wrapper type behaves a little like `Vec<&str>` but does so without copying
/// the underlying strings until necessary.
pub struct StringArray {
raw: raw::git_strarray,
}
/// A forward iterator over the strings of an array, casted to `&str`.
pub struct Iter<'a> {
range: Range<usize>,
arr: &'a StringArray,
}
/// A forward iterator over the strings of an array, casted to `&[u8]`.
pub struct IterBytes<'a> {
range: Range<usize>,
arr: &'a StringArray,
}
impl StringArray {
/// Returns None if the i'th string is not utf8 or if i is out of bounds.
pub fn get(&self, i: usize) -> Option<&str> {
self.get_bytes(i).and_then(|s| str::from_utf8(s).ok())
}
/// Returns None if `i` is out of bounds.
pub fn get_bytes(&self, i: usize) -> Option<&[u8]> {
if i < self.raw.count as usize {
unsafe {
let ptr = *self.raw.strings.add(i) as *const _;
Some(crate::opt_bytes(self, ptr).unwrap())
}
} else {
None
}
}
/// Returns an iterator over the strings contained within this array.
///
/// The iterator yields `Option<&str>` as it is unknown whether the contents
/// are utf-8 or not.
pub fn iter(&self) -> Iter<'_> {
Iter {
range: 0..self.len(),
arr: self,
}
}
/// Returns an iterator over the strings contained within this array,
/// yielding byte slices.
pub fn iter_bytes(&self) -> IterBytes<'_> {
IterBytes {
range: 0..self.len(),
arr: self,
}
}
/// Returns the number of strings in this array.
pub fn len(&self) -> usize {
self.raw.count as usize
}
/// Return `true` if this array is empty.
pub fn is_empty(&self) -> bool {
self.len() == 0
}
}
impl Binding for StringArray {
type Raw = raw::git_strarray;
unsafe fn from_raw(raw: raw::git_strarray) -> StringArray {
StringArray { raw }
}
fn raw(&self) -> raw::git_strarray {
self.raw
}
}
impl<'a> IntoIterator for &'a StringArray {
type Item = Option<&'a str>;
type IntoIter = Iter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<'a> Iterator for Iter<'a> {
type Item = Option<&'a str>;
fn next(&mut self) -> Option<Option<&'a str>> {
self.range.next().map(|i| self.arr.get(i))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.range.size_hint()
}
}
impl<'a> DoubleEndedIterator for Iter<'a> {
fn next_back(&mut self) -> Option<Option<&'a str>> {
self.range.next_back().map(|i| self.arr.get(i))
}
}
impl<'a> FusedIterator for Iter<'a> {}
impl<'a> ExactSizeIterator for Iter<'a> {}
impl<'a> Iterator for IterBytes<'a> {
type Item = &'a [u8];
fn next(&mut self) -> Option<&'a [u8]> {
self.range.next().and_then(|i| self.arr.get_bytes(i))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.range.size_hint()
}
}
impl<'a> DoubleEndedIterator for IterBytes<'a> {
fn next_back(&mut self) -> Option<&'a [u8]> {
self.range.next_back().and_then(|i| self.arr.get_bytes(i))
}
}
impl<'a> FusedIterator for IterBytes<'a> {}
impl<'a> ExactSizeIterator for IterBytes<'a> {}
impl Drop for StringArray {
fn drop(&mut self) {
unsafe { raw::git_strarray_free(&mut self.raw) }
}
}
|
