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use superslice::Ext;
use ::{TextUnit};
pub struct LineIndex {
newlines: Vec<TextUnit>,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct LineCol {
pub line: u32,
pub col: TextUnit,
}
impl LineIndex {
pub fn new(text: &str) -> LineIndex {
let mut newlines = vec![0.into()];
let mut curr = 0.into();
for c in text.chars() {
curr += TextUnit::of_char(c);
if c == '\n' {
newlines.push(curr);
}
}
LineIndex { newlines }
}
pub fn translate(&self, offset: TextUnit) -> LineCol {
let line = self.newlines.upper_bound(&offset) - 1;
let line_start_offset = self.newlines[line];
let col = offset - line_start_offset;
return LineCol { line: line as u32, col }
}
}
#[test]
fn test_line_index() {
let text = "hello\nworld";
let index = LineIndex::new(text);
assert_eq!(index.translate(0.into()), LineCol { line: 0, col: 0.into()});
assert_eq!(index.translate(1.into()), LineCol { line: 0, col: 1.into()});
assert_eq!(index.translate(5.into()), LineCol { line: 0, col: 5.into()});
assert_eq!(index.translate(6.into()), LineCol { line: 1, col: 0.into()});
assert_eq!(index.translate(7.into()), LineCol { line: 1, col: 1.into()});
assert_eq!(index.translate(8.into()), LineCol { line: 1, col: 2.into()});
assert_eq!(index.translate(10.into()), LineCol { line: 1, col: 4.into()});
assert_eq!(index.translate(11.into()), LineCol { line: 1, col: 5.into()});
assert_eq!(index.translate(12.into()), LineCol { line: 1, col: 6.into()});
let text = "\nhello\nworld";
let index = LineIndex::new(text);
assert_eq!(index.translate(0.into()), LineCol { line: 0, col: 0.into()});
assert_eq!(index.translate(1.into()), LineCol { line: 1, col: 0.into()});
assert_eq!(index.translate(2.into()), LineCol { line: 1, col: 1.into()});
assert_eq!(index.translate(6.into()), LineCol { line: 1, col: 5.into()});
assert_eq!(index.translate(7.into()), LineCol { line: 2, col: 0.into()});
}
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