123 lines
3.5 KiB
Rust
123 lines
3.5 KiB
Rust
use std::{
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fmt, ops,
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};
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use {
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SyntaxNodeRef, TextRange, TextUnit,
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text_utils::{intersect, contains_offset_nonstrict},
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};
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#[derive(Clone)]
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pub struct SyntaxText<'a> {
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node: SyntaxNodeRef<'a>,
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range: TextRange,
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}
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impl<'a> SyntaxText<'a> {
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pub(crate) fn new(node: SyntaxNodeRef<'a>) -> SyntaxText<'a> {
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SyntaxText {
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node,
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range: node.range()
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}
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}
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pub fn chunks(&self) -> impl Iterator<Item=&'a str> {
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let range = self.range;
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self.node
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.descendants()
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.filter_map(move |node| {
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let text = node.leaf_text()?;
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let range = intersect(range, node.range())?;
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let range = range - node.range().start();
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Some(&text[range])
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})
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}
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pub fn push_to(&self, buf: &mut String) {
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self.chunks().for_each(|it| buf.push_str(it));
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}
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pub fn to_string(&self) -> String {
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self.chunks().collect()
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}
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pub fn contains(&self, c: char) -> bool {
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self.chunks().any(|it| it.contains(c))
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}
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pub fn find(&self, c: char) -> Option<TextUnit> {
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let mut acc: TextUnit = 0.into();
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for chunk in self.chunks() {
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if let Some(pos) = chunk.find(c) {
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let pos: TextUnit = (pos as u32).into();
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return Some(acc + pos);
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}
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acc += TextUnit::of_str(chunk);
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}
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None
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}
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pub fn len(&self) -> TextUnit {
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self.range.len()
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}
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pub fn slice(&self, range: impl SyntaxTextSlice) -> SyntaxText<'a> {
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let range = range.restrict(self.range)
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.unwrap_or_else(|| {
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panic!("invalid slice, range: {:?}, slice: {:?}", self.range, range)
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});
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SyntaxText { node: self.node, range }
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}
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pub fn char_at(&self, offset: TextUnit) -> Option<char> {
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let mut start: TextUnit = 0.into();
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for chunk in self.chunks() {
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let end = start + TextUnit::of_str(chunk);
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if start <= offset && offset < end {
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let off: usize = u32::from(offset - start) as usize;
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return Some(chunk[off..].chars().next().unwrap());
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}
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start = end;
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}
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None
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}
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}
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impl<'a> fmt::Debug for SyntaxText<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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fmt::Debug::fmt(&self.to_string(), f)
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}
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}
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impl<'a> fmt::Display for SyntaxText<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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fmt::Display::fmt(&self.to_string(), f)
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}
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}
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pub trait SyntaxTextSlice: fmt::Debug {
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fn restrict(&self, range: TextRange) -> Option<TextRange>;
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}
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impl SyntaxTextSlice for TextRange {
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fn restrict(&self, range: TextRange) -> Option<TextRange> {
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intersect(*self, range)
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}
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}
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impl SyntaxTextSlice for ops::RangeTo<TextUnit> {
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fn restrict(&self, range: TextRange) -> Option<TextRange> {
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if !contains_offset_nonstrict(range, self.end) {
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return None;
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}
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Some(TextRange::from_to(range.start(), self.end))
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}
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}
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impl SyntaxTextSlice for ops::RangeFrom<TextUnit> {
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fn restrict(&self, range: TextRange) -> Option<TextRange> {
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if !contains_offset_nonstrict(range, self.start) {
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return None;
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}
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Some(TextRange::from_to(self.start, range.end()))
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}
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}
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impl SyntaxTextSlice for ops::Range<TextUnit> {
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fn restrict(&self, range: TextRange) -> Option<TextRange> {
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TextRange::from_to(self.start, self.end).restrict(range)
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}
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}
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