draxl_parser/
error.rs

1use draxl_ast::Span;
2use std::fmt;
3
4/// Parse error for Draxl bootstrap files.
5#[derive(Debug, Clone, PartialEq, Eq)]
6pub struct ParseError {
7    pub message: String,
8    pub span: Span,
9    pub line: usize,
10    pub column: usize,
11}
12
13impl fmt::Display for ParseError {
14    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
15        write!(
16            f,
17            "{} at line {}, column {}",
18            self.message, self.line, self.column
19        )
20    }
21}
22
23impl std::error::Error for ParseError {}
24
25pub(crate) fn parse_error(source: &str, span: Span, message: &str) -> ParseError {
26    let (line, column) = line_col(source, span.start);
27    ParseError {
28        message: message.to_owned(),
29        span,
30        line,
31        column,
32    }
33}
34
35fn line_col(source: &str, offset: usize) -> (usize, usize) {
36    let mut line = 1;
37    let mut column = 1;
38    for (index, ch) in source.char_indices() {
39        if index >= offset {
40            break;
41        }
42        if ch == '\n' {
43            line += 1;
44            column = 1;
45        } else {
46            column += 1;
47        }
48    }
49    (line, column)
50}
draxl_parser/error.rs

draxl_parser/
error.rs
