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use line_index::{LineCol, LineColUtf16, LineIndex};
use lsp_types::{Position, Range};
use rowan::{TextRange, TextSize};
pub trait LineIndexExt {
fn offset_lsp(&self, line_col: Position) -> Option<TextSize>;
fn offset_lsp_range(&self, line_col: Range) -> Option<TextRange>;
fn line_col_lsp(&self, offset: TextSize) -> Option<Position>;
fn line_col_lsp_range(&self, offset: TextRange) -> Option<Range>;
}
impl LineIndexExt for LineIndex {
fn offset_lsp(&self, line_col: Position) -> Option<TextSize> {
let line_col = LineColUtf16 {
line: line_col.line,
col: line_col.character,
};
let line_col = self.to_utf8(line_col)?;
self.offset(line_col)
}
fn offset_lsp_range(&self, line_col: Range) -> Option<TextRange> {
let start = self.offset_lsp(line_col.start)?;
let end = self.offset_lsp(line_col.end)?;
Some(TextRange::new(start, end))
}
fn line_col_lsp(&self, offset: TextSize) -> Option<Position> {
let line_col = self.line_col(offset);
let line_col = self.to_utf16(line_col)?;
Some(Position::new(line_col.line, line_col.col))
}
fn line_col_lsp_range(&self, offset: TextRange) -> Option<Range> {
let start = self.line_col_lsp(offset.start())?;
let mut end = self.line_col_lsp(offset.end())?;
if end.line != start.line && end.character == 0 {
// Prefer keeping multi-line ranges on the same line
let line_end = self.offset(LineCol {
line: end.line,
col: 0,
})?;
end = self.line_col_lsp(line_end - TextSize::from(1))?;
}
Some(Range::new(start, end))
}
}
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