s_expr/
loc.rs

1use std::fmt;
2
3/// A file position for human composed of the line (starting at 1), and column (starting a 0)
4#[derive(Clone, Copy, PartialEq, Eq)]
5pub struct Position {
6    pub line: usize,
7    pub col: usize,
8}
9
10impl Default for Position {
11    fn default() -> Self {
12        Self { line: 1, col: 0 }
13    }
14}
15
16impl fmt::Debug for Position {
17    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
18        write!(f, "{}:{}", self.line, self.col)
19    }
20}
21
22impl fmt::Display for Position {
23    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
24        write!(f, "{}:{}", self.line, self.col)
25    }
26}
27
28impl Position {
29    pub fn advance_line(&mut self) {
30        self.line += 1;
31        self.col = 0;
32    }
33
34    pub fn advance_col(&mut self) {
35        self.col += 1;
36    }
37
38    pub fn advance(&mut self, c: char) {
39        if c == '\n' {
40            self.advance_line()
41        } else {
42            self.advance_col()
43        }
44    }
45}
46
47/// Span defined by 2 positions, defining a range between start and end
48#[derive(Clone, Copy, PartialEq, Eq)]
49pub struct Span {
50    pub start: Position,
51    pub end: Position,
52}
53
54impl Span {
55    pub fn extend(&self, other: &Self) -> Self {
56        Self {
57            start: self.start,
58            end: other.end,
59        }
60    }
61
62    pub fn on_line(line: usize, start_col: usize, end_col: usize) -> Self {
63        Self {
64            start: Position {
65                line,
66                col: start_col,
67            },
68            end: Position { line, col: end_col },
69        }
70    }
71}
72
73impl fmt::Debug for Span {
74    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
75        write!(f, "{}-{}", self.start, self.end)
76    }
77}
78
79impl fmt::Display for Span {
80    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
81        write!(f, "{}-{}", self.start, self.end)
82    }
83}
84
85/// A type with the span (start and end positions) associated
86#[derive(Clone, Debug)]
87pub struct Spanned<T> {
88    pub span: Span,
89    pub inner: T,
90}
s_expr/loc.rs

s_expr/
loc.rs
