mirror of
https://github.com/denoland/deno.git
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530 lines
13 KiB
Rust
530 lines
13 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::custom_error;
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use deno_core::error::AnyError;
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use dissimilar::diff;
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use dissimilar::Chunk;
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use std::collections::HashMap;
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use text_size::TextRange;
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use text_size::TextSize;
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use tower_lsp::jsonrpc;
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use tower_lsp::lsp_types as lsp;
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use tower_lsp::lsp_types::TextEdit;
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fn partition_point<T, P>(slice: &[T], mut predicate: P) -> usize
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where
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P: FnMut(&T) -> bool,
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{
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let mut left = 0;
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let mut right = slice.len() - 1;
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while left != right {
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let mid = left + (right - left) / 2;
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// SAFETY:
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// When left < right, left <= mid < right.
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// Therefore left always increases and right always decreases,
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// and either of them is selected.
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// In both cases left <= right is satisfied.
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// Therefore if left < right in a step,
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// left <= right is satisfied in the next step.
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// Therefore as long as left != right, 0 <= left < right < len is satisfied
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// and if this case 0 <= mid < len is satisfied too.
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let value = unsafe { slice.get_unchecked(mid) };
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if predicate(value) {
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left = mid + 1;
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} else {
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right = mid;
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}
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}
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left
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}
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#[derive(Debug, Clone, Eq, PartialEq, Hash)]
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pub struct Utf16Char {
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pub start: TextSize,
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pub end: TextSize,
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}
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impl Utf16Char {
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fn len(&self) -> TextSize {
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self.end - self.start
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}
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fn len_utf16(&self) -> usize {
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if self.len() == TextSize::from(4) {
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2
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} else {
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1
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}
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}
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}
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#[derive(Debug, Clone, Default, Eq, PartialEq)]
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pub struct LineIndex {
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utf8_offsets: Vec<TextSize>,
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utf16_lines: HashMap<u32, Vec<Utf16Char>>,
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utf16_offsets: Vec<TextSize>,
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}
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impl LineIndex {
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pub fn new(text: &str) -> LineIndex {
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let mut utf16_lines = HashMap::new();
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let mut utf16_chars = Vec::new();
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let mut utf8_offsets = vec![0.into()];
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let mut utf16_offsets = vec![0.into()];
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let mut curr_row = 0.into();
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let mut curr_col = 0.into();
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let mut curr_offset_u16 = 0.into();
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let mut line = 0;
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for c in text.chars() {
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let c_len = TextSize::of(c);
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curr_row += c_len;
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curr_offset_u16 += TextSize::from(c.len_utf16() as u32);
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if c == '\n' {
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utf8_offsets.push(curr_row);
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utf16_offsets.push(curr_offset_u16);
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if !utf16_chars.is_empty() {
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utf16_lines.insert(line, utf16_chars);
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utf16_chars = Vec::new();
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}
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curr_col = 0.into();
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line += 1;
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continue;
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}
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if !c.is_ascii() {
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utf16_chars.push(Utf16Char {
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start: curr_col,
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end: curr_col + c_len,
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});
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}
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curr_col += c_len;
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}
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// utf8_offsets and utf16_offsets length is equal to (# of lines + 1)
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utf8_offsets.push(curr_row);
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utf16_offsets.push(curr_offset_u16);
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if !utf16_chars.is_empty() {
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utf16_lines.insert(line, utf16_chars);
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}
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LineIndex {
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utf8_offsets,
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utf16_lines,
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utf16_offsets,
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}
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}
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/// Convert a u16 based range to a u8 TextRange.
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pub fn get_text_range(
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&self,
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range: lsp::Range,
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) -> Result<TextRange, AnyError> {
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let start = self.offset(range.start)?;
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let end = self.offset(range.end)?;
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Ok(TextRange::new(start, end))
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}
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/// Return a u8 offset based on a u16 position.
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pub fn offset(&self, position: lsp::Position) -> Result<TextSize, AnyError> {
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let col = self.utf16_to_utf8_col(position.line, position.character);
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if let Some(line_offset) = self.utf8_offsets.get(position.line as usize) {
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Ok(line_offset + col)
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} else {
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Err(custom_error("OutOfRange", "The position is out of range."))
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}
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}
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/// Convert an lsp Position into a tsc/TypeScript "position", which is really
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/// an u16 byte offset from the start of the string represented as an u32.
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pub fn offset_tsc(&self, position: lsp::Position) -> jsonrpc::Result<u32> {
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self
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.offset_utf16(position)
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.map(|ts| ts.into())
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.map_err(|err| jsonrpc::Error::invalid_params(err.to_string()))
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}
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fn offset_utf16(
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&self,
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position: lsp::Position,
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) -> Result<TextSize, AnyError> {
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if let Some(line_offset) = self.utf16_offsets.get(position.line as usize) {
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Ok(line_offset + TextSize::from(position.character))
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} else {
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Err(custom_error("OutOfRange", "The position is out of range."))
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}
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}
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/// Returns a u16 position based on a u16 offset, which TypeScript offsets are
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/// returned as u16.
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pub fn position_tsc(&self, offset: TextSize) -> lsp::Position {
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let line = partition_point(&self.utf16_offsets, |&it| it <= offset) - 1;
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let line_start_offset = self.utf16_offsets[line];
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let col = offset - line_start_offset;
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lsp::Position {
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line: line as u32,
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character: col.into(),
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}
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}
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/// Returns a u16 position based on a u8 offset.
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pub fn position_utf16(&self, offset: TextSize) -> lsp::Position {
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let line = partition_point(&self.utf16_offsets, |&it| it <= offset) - 1;
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let line_start_offset = self.utf16_offsets[line];
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let col = offset - line_start_offset;
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lsp::Position {
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line: line as u32,
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character: col.into(),
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}
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}
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pub fn text_content_length_utf16(&self) -> TextSize {
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*self.utf16_offsets.last().unwrap()
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}
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fn utf16_to_utf8_col(&self, line: u32, mut col: u32) -> TextSize {
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if let Some(utf16_chars) = self.utf16_lines.get(&line) {
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for c in utf16_chars {
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if col > u32::from(c.start) {
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col += u32::from(c.len()) - c.len_utf16() as u32;
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} else {
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break;
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}
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}
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}
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col.into()
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}
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}
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/// Compare two strings and return a vector of text edit records which are
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/// supported by the Language Server Protocol.
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pub fn get_edits(a: &str, b: &str, line_index: &LineIndex) -> Vec<TextEdit> {
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if a == b {
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return vec![];
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}
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let chunks = diff(a, b);
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let mut text_edits = Vec::<TextEdit>::new();
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let mut iter = chunks.iter().peekable();
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let mut a_pos = TextSize::from(0);
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loop {
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let chunk = iter.next();
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match chunk {
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None => break,
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Some(Chunk::Equal(e)) => {
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a_pos += TextSize::from(e.encode_utf16().count() as u32);
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}
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Some(Chunk::Delete(d)) => {
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let start = line_index.position_utf16(a_pos);
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a_pos += TextSize::from(d.encode_utf16().count() as u32);
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let end = line_index.position_utf16(a_pos);
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let range = lsp::Range { start, end };
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match iter.peek() {
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Some(Chunk::Insert(i)) => {
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iter.next();
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text_edits.push(TextEdit {
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range,
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new_text: i.to_string(),
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});
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}
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_ => text_edits.push(TextEdit {
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range,
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new_text: "".to_string(),
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}),
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}
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}
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Some(Chunk::Insert(i)) => {
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let pos = line_index.position_utf16(a_pos);
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let range = lsp::Range {
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start: pos,
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end: pos,
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};
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text_edits.push(TextEdit {
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range,
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new_text: i.to_string(),
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});
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}
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}
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}
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text_edits
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_line_index() {
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let text = "hello\nworld";
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let index = LineIndex::new(text);
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assert_eq!(
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index.position_utf16(0.into()),
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lsp::Position {
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line: 0,
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character: 0
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}
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);
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assert_eq!(
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index.position_utf16(1.into()),
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lsp::Position {
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line: 0,
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character: 1
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}
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);
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assert_eq!(
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index.position_utf16(5.into()),
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lsp::Position {
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line: 0,
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character: 5
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}
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);
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assert_eq!(
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index.position_utf16(6.into()),
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lsp::Position {
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line: 1,
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character: 0
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}
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);
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assert_eq!(
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index.position_utf16(7.into()),
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lsp::Position {
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line: 1,
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character: 1
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}
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);
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assert_eq!(
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index.position_utf16(8.into()),
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lsp::Position {
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line: 1,
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character: 2
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}
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);
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assert_eq!(
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index.position_utf16(10.into()),
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lsp::Position {
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line: 1,
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character: 4
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}
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);
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assert_eq!(
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index.position_utf16(11.into()),
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lsp::Position {
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line: 1,
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character: 5
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}
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);
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assert_eq!(
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index.position_utf16(12.into()),
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lsp::Position {
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line: 1,
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character: 6
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}
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);
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let text = "\nhello\nworld";
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let index = LineIndex::new(text);
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assert_eq!(
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index.position_utf16(0.into()),
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lsp::Position {
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line: 0,
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character: 0
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}
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);
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assert_eq!(
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index.position_utf16(1.into()),
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lsp::Position {
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line: 1,
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character: 0
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}
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);
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assert_eq!(
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index.position_utf16(2.into()),
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lsp::Position {
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line: 1,
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character: 1
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}
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);
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assert_eq!(
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index.position_utf16(6.into()),
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lsp::Position {
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line: 1,
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character: 5
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}
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);
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assert_eq!(
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index.position_utf16(7.into()),
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lsp::Position {
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line: 2,
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character: 0
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}
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);
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}
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#[test]
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fn test_char_len() {
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assert_eq!('メ'.len_utf8(), 3);
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assert_eq!('メ'.len_utf16(), 1);
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assert_eq!('编'.len_utf8(), 3);
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assert_eq!('编'.len_utf16(), 1);
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assert_eq!('🦕'.len_utf8(), 4);
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assert_eq!('🦕'.len_utf16(), 2);
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}
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#[test]
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fn test_empty_index() {
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let col_index = LineIndex::new(
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"
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const C: char = 'x';
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",
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);
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assert_eq!(col_index.utf16_lines.len(), 0);
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}
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#[test]
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fn test_single_char() {
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let col_index = LineIndex::new(
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"
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const C: char = 'メ';
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",
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);
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assert_eq!(col_index.utf16_lines.len(), 1);
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assert_eq!(col_index.utf16_lines[&1].len(), 1);
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assert_eq!(
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col_index.utf16_lines[&1][0],
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Utf16Char {
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start: 17.into(),
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end: 20.into()
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}
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);
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// UTF-16 to UTF-8, no changes
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assert_eq!(col_index.utf16_to_utf8_col(1, 15), TextSize::from(15));
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// UTF-16 to UTF-8
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assert_eq!(col_index.utf16_to_utf8_col(1, 19), TextSize::from(21));
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let col_index = LineIndex::new("a𐐏b");
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assert_eq!(col_index.utf16_to_utf8_col(0, 3), TextSize::from(5));
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}
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#[test]
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fn test_string() {
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let col_index = LineIndex::new(
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"
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const C: char = \"メ メ\";
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",
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);
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assert_eq!(col_index.utf16_lines.len(), 1);
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assert_eq!(col_index.utf16_lines[&1].len(), 2);
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assert_eq!(
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col_index.utf16_lines[&1][0],
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Utf16Char {
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start: 17.into(),
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end: 20.into()
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}
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);
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assert_eq!(
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col_index.utf16_lines[&1][1],
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Utf16Char {
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start: 21.into(),
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end: 24.into()
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}
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);
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// UTF-16 to UTF-8
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assert_eq!(col_index.utf16_to_utf8_col(1, 15), TextSize::from(15));
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// メ UTF-8: 0xE3 0x83 0xA1, UTF-16: 0x30E1
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assert_eq!(col_index.utf16_to_utf8_col(1, 17), TextSize::from(17)); // first メ at 17..20
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assert_eq!(col_index.utf16_to_utf8_col(1, 18), TextSize::from(20)); // space
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assert_eq!(col_index.utf16_to_utf8_col(1, 19), TextSize::from(21)); // second メ at 21..24
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assert_eq!(col_index.utf16_to_utf8_col(2, 15), TextSize::from(15));
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}
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#[test]
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fn test_get_edits() {
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let a = "abcdefg";
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let b = "a\nb\nchije\nfg\n";
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let actual = get_edits(a, b, &LineIndex::new(a));
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assert_eq!(
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actual,
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vec![
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TextEdit {
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range: lsp::Range {
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start: lsp::Position {
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line: 0,
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character: 1
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},
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end: lsp::Position {
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line: 0,
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character: 5
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}
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},
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new_text: "\nb\nchije\n".to_string()
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},
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TextEdit {
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range: lsp::Range {
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start: lsp::Position {
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line: 0,
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character: 7
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},
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end: lsp::Position {
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line: 0,
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character: 7
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}
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},
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new_text: "\n".to_string()
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},
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]
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);
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}
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#[test]
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fn test_get_edits_mbc() {
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let a = "const bar = \"👍🇺🇸😃\";\nconsole.log('hello deno')\n";
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let b = "const bar = \"👍🇺🇸😃\";\nconsole.log(\"hello deno\");\n";
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let actual = get_edits(a, b, &LineIndex::new(a));
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assert_eq!(
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actual,
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vec![
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TextEdit {
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range: lsp::Range {
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start: lsp::Position {
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line: 1,
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character: 12
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},
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end: lsp::Position {
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line: 1,
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character: 13
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}
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},
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new_text: "\"".to_string()
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},
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TextEdit {
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range: lsp::Range {
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start: lsp::Position {
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line: 1,
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character: 23
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},
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end: lsp::Position {
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line: 1,
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character: 25
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}
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},
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new_text: "\");".to_string()
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},
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]
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)
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}
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}
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