1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

use crate::*;
use std::cmp::Ordering;

#[derive(Clone, Debug, Eq)]
pub struct Location {
    pub uri: URI,
    pub offset: usize,
    pub line: usize,
    pub character: usize,
}

impl Location {
    pub fn at_offset(source: &Arc<Source>, offset: usize) -> Location {
        let chars: Vec<u16> = source.code.encode_utf16().collect();
        let code_before = &chars[..offset];
        let lines: Vec<_> = code_before.split(|c| *c == '\n' as u16).collect();
        Location {
            uri: source.uri.clone(),
            offset,
            line: lines.len(),
            character: lines.last().unwrap().len() + 1,
        }
    }

    pub fn at_end_of(source: &Arc<Source>) -> Location {
        Self::at_offset(source, source.code.len())
    }

    pub fn at_position(source: &Arc<Source>, line: usize, character: usize) -> Option<Location> {
        let mut chars: Vec<u16> = source.code.encode_utf16().collect();
        let mut lines: Vec<&mut [u16]> = chars.split_mut(|c| *c == '\n' as u16).collect();

        if lines.len() < line {
            warn!(
                "Tried to get position on line {} but the source had {} lines.",
                line,
                lines.len()
            );
            return None;
        }

        let lines_before = &mut lines[..line];
        if lines_before.len() == 0 {
            return Some(Location {
                uri: source.uri.clone(),
                offset: 0,
                line: 1,
                character: 1,
            });
        }
        let last_line_before = &mut lines_before[lines_before.len() - 1];
        if last_line_before.len() < character - 1 {
            warn!(
                "Tried to get position on character {} but the line had {} characters.",
                character,
                last_line_before.len()
            );
            return None;
        }
        let mut new_last_line: Vec<_> = last_line_before[..character - 1].iter().cloned().collect();
        *last_line_before = new_last_line.as_mut_slice();

        let mut offset = 0;
        for line in lines_before.iter() {
            for _ in line.iter() {
                offset += 1;
            }
            offset += 1;
        }
        if offset > 0 {
            offset -= 1;
        }

        Some(Location {
            uri: source.uri.clone(),
            offset,
            line,
            character,
        })
    }
}

impl fmt::Display for Location {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}:{}:{}", self.uri, self.line, self.character)
    }
}

impl PartialEq for Location {
    fn eq(&self, other: &Self) -> bool {
        self.uri == other.uri && self.offset == other.offset
    }
}

impl Ord for Location {
    fn cmp(&self, other: &Self) -> Ordering {
        self.offset.cmp(&other.offset)
    }
}

impl PartialOrd for Location {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.offset.cmp(&other.offset))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn start_location_in_source() {
        let source = Source::test("hello");
        let location = Location::at_offset(&source, 0);
        assert_eq!(location.uri, source.uri);
        assert_eq!(location.offset, 0);
        assert_eq!(location.line, 1);
        assert_eq!(location.character, 1);
    }

    #[test]
    fn location_in_source() {
        let source = Source::test("hello");
        let location = Location::at_offset(&source, 3);
        assert_eq!(location.uri, source.uri);
        assert_eq!(location.offset, 3);
        assert_eq!(location.line, 1);
        assert_eq!(location.character, 4);
    }

    #[test]
    fn multiline() {
        let source = Source::test("hello\nthere");
        let location = Location::at_offset(&source, 6);
        assert_eq!(location.uri, source.uri);
        assert_eq!(location.offset, 6);
        assert_eq!(location.line, 2);
        assert_eq!(location.character, 1);
    }

    #[test]
    fn last_location() {
        let source = Source::test("hello\nthere");
        let location = Location::at_offset(&source, 11);
        assert_eq!(location.uri, source.uri);
        assert_eq!(location.offset, 11);
        assert_eq!(location.line, 2);
        assert_eq!(location.character, 6);
    }
}