mirror of
https://github.com/denoland/deno.git
synced 2024-12-30 11:16:38 -05:00
515 lines
11 KiB
Rust
515 lines
11 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
|
|
|
|
use deno_core::serde_json::json;
|
|
use deno_core::serde_json::Value;
|
|
use dissimilar::diff;
|
|
use dissimilar::Chunk;
|
|
use lspower::lsp_types;
|
|
use lspower::lsp_types::TextEdit;
|
|
use std::ops::Bound;
|
|
use std::ops::Range;
|
|
use std::ops::RangeBounds;
|
|
|
|
// TODO(@kitson) in general all of these text handling routines don't handle
|
|
// JavaScript encoding in the same way and likely cause issues when trying to
|
|
// arbitrate between chars and Unicode graphemes. There be dragons.
|
|
|
|
/// Generate a character position for the start of each line. For example:
|
|
///
|
|
/// ```rust
|
|
/// let actual = index_lines("a\nb\n");
|
|
/// assert_eq!(actual, vec![0, 2, 4]);
|
|
/// ```
|
|
///
|
|
pub fn index_lines(text: &str) -> Vec<u32> {
|
|
let mut indexes = vec![0_u32];
|
|
for (i, c) in text.chars().enumerate() {
|
|
if c == '\n' {
|
|
indexes.push((i + 1) as u32);
|
|
}
|
|
}
|
|
indexes
|
|
}
|
|
|
|
enum IndexValid {
|
|
All,
|
|
UpTo(u32),
|
|
}
|
|
|
|
impl IndexValid {
|
|
fn covers(&self, line: u32) -> bool {
|
|
match *self {
|
|
IndexValid::UpTo(to) => to > line,
|
|
IndexValid::All => true,
|
|
}
|
|
}
|
|
}
|
|
|
|
fn to_range(line_index: &[u32], range: lsp_types::Range) -> Range<usize> {
|
|
let start =
|
|
(line_index[range.start.line as usize] + range.start.character) as usize;
|
|
let end =
|
|
(line_index[range.end.line as usize] + range.end.character) as usize;
|
|
Range { start, end }
|
|
}
|
|
|
|
pub fn to_position(line_index: &[u32], char_pos: u32) -> lsp_types::Position {
|
|
let mut line = 0_usize;
|
|
let mut line_start = 0_u32;
|
|
for (pos, v) in line_index.iter().enumerate() {
|
|
if char_pos < *v {
|
|
break;
|
|
}
|
|
line_start = *v;
|
|
line = pos;
|
|
}
|
|
|
|
lsp_types::Position {
|
|
line: line as u32,
|
|
character: char_pos - line_start,
|
|
}
|
|
}
|
|
|
|
pub fn to_char_pos(line_index: &[u32], position: lsp_types::Position) -> u32 {
|
|
if let Some(line_start) = line_index.get(position.line as usize) {
|
|
line_start + position.character
|
|
} else {
|
|
0_u32
|
|
}
|
|
}
|
|
|
|
/// Apply a vector of document changes to the supplied string.
|
|
pub fn apply_content_changes(
|
|
content: &mut String,
|
|
content_changes: Vec<lsp_types::TextDocumentContentChangeEvent>,
|
|
) {
|
|
let mut line_index = index_lines(&content);
|
|
let mut index_valid = IndexValid::All;
|
|
for change in content_changes {
|
|
if let Some(range) = change.range {
|
|
if !index_valid.covers(range.start.line) {
|
|
line_index = index_lines(&content);
|
|
}
|
|
let range = to_range(&line_index, range);
|
|
content.replace_range(range, &change.text);
|
|
} else {
|
|
*content = change.text;
|
|
index_valid = IndexValid::UpTo(0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Compare two strings and return a vector of text edit records which are
|
|
/// supported by the Language Server Protocol.
|
|
pub fn get_edits(a: &str, b: &str) -> Vec<TextEdit> {
|
|
let chunks = diff(a, b);
|
|
let mut text_edits = Vec::<TextEdit>::new();
|
|
let line_index = index_lines(a);
|
|
let mut iter = chunks.iter().peekable();
|
|
let mut a_pos = 0_u32;
|
|
loop {
|
|
let chunk = iter.next();
|
|
match chunk {
|
|
None => break,
|
|
Some(Chunk::Equal(e)) => {
|
|
a_pos += e.chars().count() as u32;
|
|
}
|
|
Some(Chunk::Delete(d)) => {
|
|
let start = to_position(&line_index, a_pos);
|
|
a_pos += d.chars().count() as u32;
|
|
let end = to_position(&line_index, a_pos);
|
|
let range = lsp_types::Range { start, end };
|
|
match iter.peek() {
|
|
Some(Chunk::Insert(i)) => {
|
|
iter.next();
|
|
text_edits.push(TextEdit {
|
|
range,
|
|
new_text: i.to_string(),
|
|
});
|
|
}
|
|
_ => text_edits.push(TextEdit {
|
|
range,
|
|
new_text: "".to_string(),
|
|
}),
|
|
}
|
|
}
|
|
Some(Chunk::Insert(i)) => {
|
|
let pos = to_position(&line_index, a_pos);
|
|
let range = lsp_types::Range {
|
|
start: pos,
|
|
end: pos,
|
|
};
|
|
text_edits.push(TextEdit {
|
|
range,
|
|
new_text: i.to_string(),
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
text_edits
|
|
}
|
|
|
|
/// Convert a difference between two strings into a change range used by the
|
|
/// TypeScript Language Service.
|
|
pub fn get_range_change(a: &str, b: &str) -> Value {
|
|
let chunks = diff(a, b);
|
|
let mut iter = chunks.iter().peekable();
|
|
let mut started = false;
|
|
let mut start = 0;
|
|
let mut end = 0;
|
|
let mut new_length = 0;
|
|
let mut equal = 0;
|
|
let mut a_pos = 0;
|
|
loop {
|
|
let chunk = iter.next();
|
|
match chunk {
|
|
None => break,
|
|
Some(Chunk::Equal(e)) => {
|
|
a_pos += e.chars().count();
|
|
equal += e.chars().count();
|
|
}
|
|
Some(Chunk::Delete(d)) => {
|
|
if !started {
|
|
start = a_pos;
|
|
started = true;
|
|
equal = 0;
|
|
}
|
|
a_pos += d.chars().count();
|
|
if started {
|
|
end = a_pos;
|
|
new_length += equal;
|
|
equal = 0;
|
|
}
|
|
}
|
|
Some(Chunk::Insert(i)) => {
|
|
if !started {
|
|
start = a_pos;
|
|
end = a_pos;
|
|
started = true;
|
|
equal = 0;
|
|
} else {
|
|
end += equal;
|
|
}
|
|
new_length += i.chars().count() + equal;
|
|
equal = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
json!({
|
|
"span": {
|
|
"start": start,
|
|
"length": end - start,
|
|
},
|
|
"newLength": new_length,
|
|
})
|
|
}
|
|
|
|
/// Provide a slice of a string based on a character range.
|
|
pub fn slice(s: &str, range: impl RangeBounds<usize>) -> &str {
|
|
let start = match range.start_bound() {
|
|
Bound::Included(bound) | Bound::Excluded(bound) => *bound,
|
|
Bound::Unbounded => 0,
|
|
};
|
|
let len = match range.end_bound() {
|
|
Bound::Included(bound) => *bound + 1,
|
|
Bound::Excluded(bound) => *bound,
|
|
Bound::Unbounded => s.len(),
|
|
} - start;
|
|
substring(s, start, start + len)
|
|
}
|
|
|
|
/// Provide a substring based on the start and end character index positions.
|
|
pub fn substring(s: &str, start: usize, end: usize) -> &str {
|
|
let len = end - start;
|
|
let mut char_pos = 0;
|
|
let mut byte_start = 0;
|
|
let mut it = s.chars();
|
|
loop {
|
|
if char_pos == start {
|
|
break;
|
|
}
|
|
if let Some(c) = it.next() {
|
|
char_pos += 1;
|
|
byte_start += c.len_utf8();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
char_pos = 0;
|
|
let mut byte_end = byte_start;
|
|
loop {
|
|
if char_pos == len {
|
|
break;
|
|
}
|
|
if let Some(c) = it.next() {
|
|
char_pos += 1;
|
|
byte_end += c.len_utf8();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
&s[byte_start..byte_end]
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_apply_content_changes() {
|
|
let mut content = "a\nb\nc\nd".to_string();
|
|
let content_changes = vec![lsp_types::TextDocumentContentChangeEvent {
|
|
range: Some(lsp_types::Range {
|
|
start: lsp_types::Position {
|
|
line: 1,
|
|
character: 0,
|
|
},
|
|
end: lsp_types::Position {
|
|
line: 1,
|
|
character: 1,
|
|
},
|
|
}),
|
|
range_length: Some(1),
|
|
text: "e".to_string(),
|
|
}];
|
|
apply_content_changes(&mut content, content_changes);
|
|
assert_eq!(content, "a\ne\nc\nd");
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_edits() {
|
|
let a = "abcdefg";
|
|
let b = "a\nb\nchije\nfg\n";
|
|
let actual = get_edits(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
vec![
|
|
TextEdit {
|
|
range: lsp_types::Range {
|
|
start: lsp_types::Position {
|
|
line: 0,
|
|
character: 1
|
|
},
|
|
end: lsp_types::Position {
|
|
line: 0,
|
|
character: 5
|
|
}
|
|
},
|
|
new_text: "\nb\nchije\n".to_string()
|
|
},
|
|
TextEdit {
|
|
range: lsp_types::Range {
|
|
start: lsp_types::Position {
|
|
line: 0,
|
|
character: 7
|
|
},
|
|
end: lsp_types::Position {
|
|
line: 0,
|
|
character: 7
|
|
}
|
|
},
|
|
new_text: "\n".to_string()
|
|
},
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_range_change() {
|
|
let a = "abcdefg";
|
|
let b = "abedcfg";
|
|
let actual = get_range_change(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
json!({
|
|
"span": {
|
|
"start": 2,
|
|
"length": 3,
|
|
},
|
|
"newLength": 3
|
|
})
|
|
);
|
|
|
|
let a = "abfg";
|
|
let b = "abcdefg";
|
|
let actual = get_range_change(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
json!({
|
|
"span": {
|
|
"start": 2,
|
|
"length": 0,
|
|
},
|
|
"newLength": 3
|
|
})
|
|
);
|
|
|
|
let a = "abcdefg";
|
|
let b = "abfg";
|
|
let actual = get_range_change(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
json!({
|
|
"span": {
|
|
"start": 2,
|
|
"length": 3,
|
|
},
|
|
"newLength": 0
|
|
})
|
|
);
|
|
|
|
let a = "abcdefg";
|
|
let b = "abfghij";
|
|
let actual = get_range_change(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
json!({
|
|
"span": {
|
|
"start": 2,
|
|
"length": 5,
|
|
},
|
|
"newLength": 5
|
|
})
|
|
);
|
|
|
|
let a = "abcdefghijk";
|
|
let b = "axcxexfxixk";
|
|
let actual = get_range_change(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
json!({
|
|
"span": {
|
|
"start": 1,
|
|
"length": 9,
|
|
},
|
|
"newLength": 9
|
|
})
|
|
);
|
|
|
|
let a = "abcde";
|
|
let b = "ab(c)de";
|
|
let actual = get_range_change(a, b);
|
|
assert_eq!(
|
|
actual,
|
|
json!({
|
|
"span" : {
|
|
"start": 2,
|
|
"length": 1,
|
|
},
|
|
"newLength": 3
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_index_lines() {
|
|
let actual = index_lines("a\nb\r\nc");
|
|
assert_eq!(actual, vec![0, 2, 5]);
|
|
}
|
|
|
|
#[test]
|
|
fn test_to_position() {
|
|
let line_index = index_lines("a\nb\r\nc\n");
|
|
assert_eq!(
|
|
to_position(&line_index, 6),
|
|
lsp_types::Position {
|
|
line: 2,
|
|
character: 1,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 0),
|
|
lsp_types::Position {
|
|
line: 0,
|
|
character: 0,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 3),
|
|
lsp_types::Position {
|
|
line: 1,
|
|
character: 1,
|
|
}
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_to_position_mbc() {
|
|
let line_index = index_lines("y̆\n😱🦕\n🤯\n");
|
|
assert_eq!(
|
|
to_position(&line_index, 0),
|
|
lsp_types::Position {
|
|
line: 0,
|
|
character: 0,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 2),
|
|
lsp_types::Position {
|
|
line: 0,
|
|
character: 2,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 3),
|
|
lsp_types::Position {
|
|
line: 1,
|
|
character: 0,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 4),
|
|
lsp_types::Position {
|
|
line: 1,
|
|
character: 1,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 5),
|
|
lsp_types::Position {
|
|
line: 1,
|
|
character: 2,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 6),
|
|
lsp_types::Position {
|
|
line: 2,
|
|
character: 0,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 7),
|
|
lsp_types::Position {
|
|
line: 2,
|
|
character: 1,
|
|
}
|
|
);
|
|
assert_eq!(
|
|
to_position(&line_index, 8),
|
|
lsp_types::Position {
|
|
line: 3,
|
|
character: 0,
|
|
}
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_substring() {
|
|
assert_eq!(substring("Deno", 1, 3), "en");
|
|
assert_eq!(substring("y̆y̆", 2, 4), "y̆");
|
|
// this doesn't work like JavaScript, as 🦕 is treated as a single char in
|
|
// Rust, but as two chars in JavaScript.
|
|
// assert_eq!(substring("🦕🦕", 2, 4), "🦕");
|
|
}
|
|
|
|
#[test]
|
|
fn test_slice() {
|
|
assert_eq!(slice("Deno", 1..3), "en");
|
|
assert_eq!(slice("Deno", 1..=3), "eno");
|
|
assert_eq!(slice("Deno Land", 1..), "eno Land");
|
|
assert_eq!(slice("Deno", ..3), "Den");
|
|
}
|
|
}
|