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range.rs
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range.rs
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use super::notebook;
use super::PositionEncoding;
use lsp_types as types;
use ruff_notebook::NotebookIndex;
use ruff_source_file::OneIndexed;
use ruff_source_file::{LineIndex, SourceLocation};
use ruff_text_size::{TextRange, TextSize};
pub(crate) struct NotebookRange {
pub(crate) cell: notebook::CellId,
pub(crate) range: types::Range,
}
pub(crate) trait RangeExt {
fn to_text_range(&self, text: &str, index: &LineIndex, encoding: PositionEncoding)
-> TextRange;
}
pub(crate) trait ToRangeExt {
fn to_range(&self, text: &str, index: &LineIndex, encoding: PositionEncoding) -> types::Range;
fn to_notebook_range(
&self,
text: &str,
source_index: &LineIndex,
notebook_index: &NotebookIndex,
encoding: PositionEncoding,
) -> NotebookRange;
}
fn u32_index_to_usize(index: u32) -> usize {
usize::try_from(index).expect("u32 fits in usize")
}
impl RangeExt for lsp_types::Range {
fn to_text_range(
&self,
text: &str,
index: &LineIndex,
encoding: PositionEncoding,
) -> TextRange {
let start_line = index.line_range(
OneIndexed::from_zero_indexed(u32_index_to_usize(self.start.line)),
text,
);
let end_line = index.line_range(
OneIndexed::from_zero_indexed(u32_index_to_usize(self.end.line)),
text,
);
let (start_column_offset, end_column_offset) = match encoding {
PositionEncoding::UTF8 => (
TextSize::new(self.start.character),
TextSize::new(self.end.character),
),
PositionEncoding::UTF16 => {
// Fast path for ASCII only documents
if index.is_ascii() {
(
TextSize::new(self.start.character),
TextSize::new(self.end.character),
)
} else {
// UTF16 encodes characters either as one or two 16 bit words.
// The position in `range` is the 16-bit word offset from the start of the line (and not the character offset)
// UTF-16 with a text that may use variable-length characters.
(
utf8_column_offset(self.start.character, &text[start_line]),
utf8_column_offset(self.end.character, &text[end_line]),
)
}
}
PositionEncoding::UTF32 => {
// UTF-32 uses 4 bytes for each character. Meaning, the position in range is a character offset.
return TextRange::new(
index.offset(
OneIndexed::from_zero_indexed(u32_index_to_usize(self.start.line)),
OneIndexed::from_zero_indexed(u32_index_to_usize(self.start.character)),
text,
),
index.offset(
OneIndexed::from_zero_indexed(u32_index_to_usize(self.end.line)),
OneIndexed::from_zero_indexed(u32_index_to_usize(self.end.character)),
text,
),
);
}
};
TextRange::new(
start_line.start() + start_column_offset.clamp(TextSize::new(0), start_line.end()),
end_line.start() + end_column_offset.clamp(TextSize::new(0), end_line.end()),
)
}
}
impl ToRangeExt for TextRange {
fn to_range(&self, text: &str, index: &LineIndex, encoding: PositionEncoding) -> types::Range {
types::Range {
start: source_location_to_position(&offset_to_source_location(
self.start(),
text,
index,
encoding,
)),
end: source_location_to_position(&offset_to_source_location(
self.end(),
text,
index,
encoding,
)),
}
}
fn to_notebook_range(
&self,
text: &str,
source_index: &LineIndex,
notebook_index: &NotebookIndex,
encoding: PositionEncoding,
) -> NotebookRange {
let start = offset_to_source_location(self.start(), text, source_index, encoding);
let mut end = offset_to_source_location(self.end(), text, source_index, encoding);
let starting_cell = notebook_index.cell(start.row);
// weird edge case here - if the end of the range is where the newline after the cell got added (making it 'out of bounds')
// we need to move it one character back (which should place it at the end of the last line).
// we test this by checking if the ending offset is in a different (or nonexistent) cell compared to the cell of the starting offset.
if notebook_index.cell(end.row) != starting_cell {
end.row = end.row.saturating_sub(1);
end.column = offset_to_source_location(
self.end().checked_sub(1.into()).unwrap_or_default(),
text,
source_index,
encoding,
)
.column;
}
let start = source_location_to_position(¬ebook_index.translate_location(&start));
let end = source_location_to_position(¬ebook_index.translate_location(&end));
NotebookRange {
cell: starting_cell
.map(OneIndexed::to_zero_indexed)
.unwrap_or_default(),
range: types::Range { start, end },
}
}
}
/// Converts a UTF-16 code unit offset for a given line into a UTF-8 column number.
fn utf8_column_offset(utf16_code_unit_offset: u32, line: &str) -> TextSize {
let mut utf8_code_unit_offset = TextSize::new(0);
let mut i = 0u32;
for c in line.chars() {
if i >= utf16_code_unit_offset {
break;
}
// Count characters encoded as two 16 bit words as 2 characters.
{
utf8_code_unit_offset +=
TextSize::new(u32::try_from(c.len_utf8()).expect("utf8 len always <=4"));
i += u32::try_from(c.len_utf16()).expect("utf16 len always <=2");
}
}
utf8_code_unit_offset
}
fn offset_to_source_location(
offset: TextSize,
text: &str,
index: &LineIndex,
encoding: PositionEncoding,
) -> SourceLocation {
match encoding {
PositionEncoding::UTF8 => {
let row = index.line_index(offset);
let column = offset - index.line_start(row, text);
SourceLocation {
column: OneIndexed::from_zero_indexed(column.to_usize()),
row,
}
}
PositionEncoding::UTF16 => {
let row = index.line_index(offset);
let column = if index.is_ascii() {
(offset - index.line_start(row, text)).to_usize()
} else {
let up_to_line = &text[TextRange::new(index.line_start(row, text), offset)];
up_to_line.encode_utf16().count()
};
SourceLocation {
column: OneIndexed::from_zero_indexed(column),
row,
}
}
PositionEncoding::UTF32 => index.source_location(offset, text),
}
}
fn source_location_to_position(location: &SourceLocation) -> types::Position {
types::Position {
line: u32::try_from(location.row.to_zero_indexed()).expect("row usize fits in u32"),
character: u32::try_from(location.column.to_zero_indexed())
.expect("character usize fits in u32"),
}
}