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use crate::{Span, Statement};
use std::ops::{Deref, DerefMut, RangeBounds};
/// A code block is a vector of statements, with maybe a vector of spans.
#[derive(Debug, Clone, Default)]
#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
#[cfg_attr(feature = "serialize", serde(transparent))]
#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
pub struct Block {
body: Vec<Statement>,
#[cfg_attr(feature = "serialize", serde(skip))]
span_info: Vec<Span>,
}
impl Block {
pub const fn new() -> Self {
Self {
body: Vec::new(),
span_info: Vec::new(),
}
}
pub fn from_vec(body: Vec<Statement>) -> Self {
let span_info = std::iter::repeat(Span::default())
.take(body.len())
.collect();
Self { body, span_info }
}
pub fn with_capacity(capacity: usize) -> Self {
Self {
body: Vec::with_capacity(capacity),
span_info: Vec::with_capacity(capacity),
}
}
#[allow(unused_variables)]
pub fn push(&mut self, end: Statement, span: Span) {
self.body.push(end);
self.span_info.push(span);
}
pub fn extend(&mut self, item: Option<(Statement, Span)>) {
if let Some((end, span)) = item {
self.push(end, span)
}
}
pub fn extend_block(&mut self, other: Self) {
self.span_info.extend(other.span_info);
self.body.extend(other.body);
}
pub fn append(&mut self, other: &mut Self) {
self.span_info.append(&mut other.span_info);
self.body.append(&mut other.body);
}
pub fn cull<R: RangeBounds<usize> + Clone>(&mut self, range: R) {
self.span_info.drain(range.clone());
self.body.drain(range);
}
pub fn splice<R: RangeBounds<usize> + Clone>(&mut self, range: R, other: Self) {
self.span_info.splice(range.clone(), other.span_info);
self.body.splice(range, other.body);
}
pub fn span_into_iter(self) -> impl Iterator<Item = (Statement, Span)> {
let Block { body, span_info } = self;
body.into_iter().zip(span_info)
}
pub fn span_iter(&self) -> impl Iterator<Item = (&Statement, &Span)> {
let span_iter = self.span_info.iter();
self.body.iter().zip(span_iter)
}
pub fn span_iter_mut(&mut self) -> impl Iterator<Item = (&mut Statement, Option<&mut Span>)> {
let span_iter = self.span_info.iter_mut().map(Some);
self.body.iter_mut().zip(span_iter)
}
pub fn is_empty(&self) -> bool {
self.body.is_empty()
}
pub fn len(&self) -> usize {
self.body.len()
}
}
impl Deref for Block {
type Target = [Statement];
fn deref(&self) -> &[Statement] {
&self.body
}
}
impl DerefMut for Block {
fn deref_mut(&mut self) -> &mut [Statement] {
&mut self.body
}
}
impl<'a> IntoIterator for &'a Block {
type Item = &'a Statement;
type IntoIter = std::slice::Iter<'a, Statement>;
fn into_iter(self) -> std::slice::Iter<'a, Statement> {
self.iter()
}
}
#[cfg(feature = "deserialize")]
impl<'de> serde::Deserialize<'de> for Block {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
Ok(Self::from_vec(Vec::deserialize(deserializer)?))
}
}
impl From<Vec<Statement>> for Block {
fn from(body: Vec<Statement>) -> Self {
Self::from_vec(body)
}
}