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use rslint_rowan::{Language, SyntaxElement, SyntaxNode, SyntaxToken, TextRange};
use std::{collections::HashMap, ops::Range};
pub trait Span {
fn as_range(&self) -> Range<usize>;
fn as_text_range(&self) -> TextRange {
TextRange::new(
(self.as_range().start as u32).into(),
(self.as_range().end as u32).into(),
)
}
fn join<T: Span>(&self, other: T) -> Range<usize> {
self.as_range().start..other.as_range().end
}
fn between<T: Span>(&self, other: T) -> Range<usize> {
self.as_range().end..other.as_range().start
}
fn until<T: Span>(&self, other: T) -> Range<usize> {
self.as_range().start..other.as_range().start
}
fn sub_start(&self, amount: usize) -> Range<usize> {
let range = self.as_range();
range.start - amount..range.end
}
fn add_start(&self, amount: usize) -> Range<usize> {
let range = self.as_range();
range.start + amount..range.end
}
fn sub_end(&self, amount: usize) -> Range<usize> {
let range = self.as_range();
range.start..range.end - amount
}
fn add_end(&self, amount: usize) -> Range<usize> {
let range = self.as_range();
range.start..range.end + amount
}
}
impl<T: Span> Span for &T {
fn as_range(&self) -> Range<usize> {
(*self).as_range()
}
}
impl<T: Span> Span for &mut T {
fn as_range(&self) -> Range<usize> {
(**self).as_range()
}
}
impl<T: Clone> Span for Range<T>
where
T: Into<usize>,
{
fn as_range(&self) -> Range<usize> {
self.start.clone().into()..self.end.clone().into()
}
}
impl<T: Language> Span for SyntaxNode<T> {
fn as_range(&self) -> Range<usize> {
self.text_range().into()
}
}
impl<T: Language> Span for SyntaxToken<T> {
fn as_range(&self) -> Range<usize> {
self.text_range().into()
}
}
impl<T: Language> Span for SyntaxElement<T> {
fn as_range(&self) -> Range<usize> {
match self {
SyntaxElement::Node(n) => n.text_range(),
SyntaxElement::Token(t) => t.text_range(),
}
.into()
}
}
impl Span for TextRange {
fn as_range(&self) -> Range<usize> {
self.clone().into()
}
}
pub type FileId = usize;
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct FileSpan {
pub file: FileId,
pub range: Range<usize>,
}
impl FileSpan {
pub fn new(file: FileId, span: impl Span) -> Self {
Self {
file,
range: span.as_range(),
}
}
}
pub trait Files {
fn name(&self, id: FileId) -> Option<&str>;
fn source(&self, id: FileId) -> Option<&str>;
fn line_index(&self, file_id: FileId, byte_index: usize) -> Option<usize>;
fn line_range(&self, id: FileId, line_index: usize) -> Option<Range<usize>>;
}
#[derive(Clone, Debug)]
pub struct SimpleFile {
name: String,
source: String,
line_starts: Vec<usize>,
}
impl SimpleFile {
pub fn new(name: String, source: String) -> Self {
Self {
line_starts: line_starts(&source).collect(),
name,
source,
}
}
fn line_start(&self, line_index: usize) -> Option<usize> {
use std::cmp::Ordering;
match line_index.cmp(&self.line_starts.len()) {
Ordering::Less => self.line_starts.get(line_index).cloned(),
Ordering::Equal => Some(self.source.len()),
Ordering::Greater => None,
}
}
}
impl Files for SimpleFile {
fn name(&self, _id: FileId) -> Option<&str> {
Some(&self.name)
}
fn source(&self, _id: FileId) -> Option<&str> {
Some(&self.source)
}
fn line_index(&self, _file_id: FileId, byte_index: usize) -> Option<usize> {
Some(
self.line_starts
.binary_search(&byte_index)
.unwrap_or_else(|next_line| next_line - 1),
)
}
fn line_range(&self, _: FileId, line_index: usize) -> Option<Range<usize>> {
let line_start = self.line_start(line_index)?;
let next_line_start = self.line_start(line_index + 1)?;
Some(line_start..next_line_start)
}
}
#[derive(Clone, Debug, Default)]
pub struct SimpleFiles {
files: HashMap<FileId, SimpleFile>,
id: usize,
}
impl SimpleFiles {
pub fn new() -> Self {
Self::default()
}
pub fn add(&mut self, name: String, source: String) -> FileId {
let id = self.id;
self.id += 1;
self.files.insert(id, SimpleFile::new(name, source));
id
}
pub fn get(&self, id: FileId) -> Option<&SimpleFile> {
self.files.get(&id)
}
}
impl Files for SimpleFiles {
fn name(&self, id: FileId) -> Option<&str> {
self.files.get(&id)?.name(id)
}
fn source(&self, id: FileId) -> Option<&str> {
self.files.get(&id)?.source(id)
}
fn line_index(&self, id: FileId, byte_index: usize) -> Option<usize> {
self.files.get(&id)?.line_index(id, byte_index)
}
fn line_range(&self, file_id: FileId, line_index: usize) -> Option<Range<usize>> {
self.files.get(&file_id)?.line_range(file_id, line_index)
}
}
pub fn line_starts(source: &str) -> impl '_ + Iterator<Item = usize> {
std::iter::once(0).chain(
source
.match_indices(&['\n', '\r', '\u{2028}', '\u{2029}'][..])
.map(|(i, _)| i + 1),
)
}