1 files changed, 0 insertions, 145 deletions
diff --git a/src/parse/lines.rs b/src/parse/lines.rs
deleted file mode 100644
index 2d97a25c..00000000
--- a/src/parse/lines.rs
+++ /dev/null
@@ -1,145 +0,0 @@
-// FIXME:
-// Both `LineMap::location` and `search_column` can lead to quadratic compile
-// times for very long lines. We probably need some smart acceleration structure
-// to determine columns.
-
-use super::Scanner;
-use crate::syntax::{Location, Pos};
-
-/// Enables conversion of byte position to locations.
-pub struct LineMap<'s> {
-    src: &'s str,
-    line_starts: Vec<Pos>,
-}
-
-impl<'s> LineMap<'s> {
-    /// Create a new line map for a source string.
-    pub fn new(src: &'s str) -> Self {
-        let mut line_starts = vec![Pos::ZERO];
-        let mut s = Scanner::new(src);
-
-        while let Some(c) = s.eat_merging_crlf() {
-            if is_newline(c) {
-                line_starts.push(s.index().into());
-            }
-        }
-
-        Self { src, line_starts }
-    }
-
-    /// Convert a byte position to a location.
-    pub fn location(&self, pos: Pos) -> Option<Location> {
-        // Find the line which contains the position.
-        let line_index = match self.line_starts.binary_search(&pos) {
-            Ok(i) => i,
-            Err(i) => i - 1,
-        };
-
-        let start = self.line_starts.get(line_index)?;
-        let head = self.src.get(start.to_usize() .. pos.to_usize())?;
-
-        // TODO: What about tabs?
-        let column_index = head.chars().count();
-
-        Some(Location {
-            line: 1 + line_index as u32,
-            column: 1 + column_index as u32,
-        })
-    }
-
-    /// Convert a location to a byte position.
-    pub fn pos(&self, location: Location) -> Option<Pos> {
-        // Determine the boundaries of the line.
-        let line_idx = location.line.checked_sub(1)? as usize;
-        let line_start = *self.line_starts.get(line_idx)?;
-        let line_end = self
-            .line_starts
-            .get(location.line as usize)
-            .map_or(self.src.len(), |pos| pos.to_usize());
-
-        let line = self.src.get(line_start.to_usize() .. line_end)?;
-
-        // Find the index in the line. For the first column, the index is always
-        // zero. For other columns, we have to look at which byte the char
-        // directly before the column in question ends. We can't do
-        // `nth(column_idx)` directly since the column may be behind the last
-        // char.
-        let column_idx = location.column.checked_sub(1)? as usize;
-        let line_offset = if let Some(prev_idx) = column_idx.checked_sub(1) {
-            // TODO: What about tabs?
-            let (idx, prev) = line.char_indices().nth(prev_idx)?;
-            idx + prev.len_utf8()
-        } else {
-            0
-        };
-
-        Some(line_start + line_offset)
-    }
-}
-
-/// Count how many column the string would fill.
-pub fn count_columns(src: &str) -> usize {
-    let mut column = 0;
-    for c in src.chars().rev() {
-        if is_newline(c) {
-            break;
-        } else if c == '\t' {
-            // TODO: How many columns per tab?
-            column += 2;
-        } else {
-            column += 1;
-        }
-    }
-    column
-}
-
-/// Whether this character denotes a newline.
-#[inline]
-pub fn is_newline(character: char) -> bool {
-    matches!(
-        character,
-        // Line Feed, Vertical Tab, Form Feed, Carriage Return.
-        '\n' | '\x0B' | '\x0C' | '\r' |
-        // Next Line, Line Separator, Paragraph Separator.
-        '\u{0085}' | '\u{2028}' | '\u{2029}'
-    )
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    const TEST: &str = "äbcde\nf💛g\r\nhi\rjkl";
-
-    #[test]
-    fn test_line_map_new() {
-        let map = LineMap::new(TEST);
-        assert_eq!(map.line_starts, vec![Pos(0), Pos(7), Pos(15), Pos(18)]);
-    }
-
-    #[test]
-    fn test_line_map_location() {
-        let map = LineMap::new(TEST);
-        assert_eq!(map.location(Pos(0)), Some(Location::new(1, 1)));
-        assert_eq!(map.location(Pos(2)), Some(Location::new(1, 2)));
-        assert_eq!(map.location(Pos(6)), Some(Location::new(1, 6)));
-        assert_eq!(map.location(Pos(7)), Some(Location::new(2, 1)));
-        assert_eq!(map.location(Pos(8)), Some(Location::new(2, 2)));
-        assert_eq!(map.location(Pos(12)), Some(Location::new(2, 3)));
-        assert_eq!(map.location(Pos(21)), Some(Location::new(4, 4)));
-        assert_eq!(map.location(Pos(22)), None);
-    }
-
-    #[test]
-    fn test_line_map_pos() {
-        fn assert_round_trip(map: &LineMap, pos: Pos) {
-            assert_eq!(map.location(pos).and_then(|loc| map.pos(loc)), Some(pos));
-        }
-
-        let map = LineMap::new(TEST);
-        assert_round_trip(&map, Pos(0));
-        assert_round_trip(&map, Pos(7));
-        assert_round_trip(&map, Pos(12));
-        assert_round_trip(&map, Pos(21));
-    }
-}