hledger_fmt/parser/
errors.rs

1use crate::String;
2
3/// Syntax error occurring while parsing a journal file content.
4#[derive(Debug, PartialEq)]
5pub struct SyntaxError {
6    pub lineno: usize,
7    pub colno_start: usize,
8    pub colno_end: usize,
9    pub message: String,
10    pub expected: &'static str,
11}
12
13/// Generate an error context similar to what hledger does.
14#[cfg(feature = "cli")]
15pub fn build_error_context(
16    error: &SyntaxError,
17    content: &[u8],
18    file_path_or_stdin: &crate::file_path::FilePathOrStdin,
19) -> String {
20    use std::io::{self, BufRead, Cursor};
21    let cursor = Cursor::new(content);
22    let reader = io::BufReader::new(cursor);
23    let lines = reader
24        .lines()
25        .map(|line| line.unwrap_or_default())
26        .collect::<Vec<String>>();
27    let mut context = format!(
28        "hledger-fmt error: {}:{}:{}:\n",
29        file_path_or_stdin, error.lineno, error.colno_start
30    );
31
32    let lineno_len = format!("{}", error.lineno).len();
33    if error.lineno > 1 {
34        context.push_str(&format!(
35            "{} | {}\n",
36            " ".repeat(lineno_len),
37            lines[error.lineno - 2]
38        ));
39    }
40    context.push_str(&format!("{} | {}\n", error.lineno, lines[error.lineno - 1]));
41    context.push_str(&format!(
42        "{} | {}{}\n",
43        " ".repeat(lineno_len),
44        " ".repeat(error.colno_start - 1),
45        "^".repeat(error.colno_end - error.colno_start)
46    ));
47    context.push_str(&format!("{}\nExpected {}", error.message, error.expected));
48    context
49}
hledger_fmt/parser/errors.rs

hledger_fmt/parser/
errors.rs
