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use std::error::Error;
use std::io::BufRead;
use serde::de::DeserializeOwned;
#[allow(dead_code)]
pub fn parse_csv_data<D: DeserializeOwned>(reader: &mut dyn BufRead)
-> Result<Vec<D>, Box<dyn Error>>
{
let mut records = Vec::<D>::new();
let mut csv_reader = csv::ReaderBuilder::new()
.delimiter(b';')
.has_headers(true)
.from_reader(reader);
for result in csv_reader.deserialize() {
let record: D = result?;
records.push(record);
}
Ok(records)
}
#[cfg(test)]
mod tests {
use super::*;
use serde::Deserialize;
#[derive(Debug, Deserialize)]
struct Record {
count: u32,
comment: String,
}
#[test]
fn test_10000_parse_ok() {
let data = "\
count;comment
0;a
1;b
999;c
";
let mut input: &[u8] = data.as_bytes();
let records: Vec<Record> = parse_csv_data(&mut input).unwrap();
let strings: Vec<String> = records.iter().map(|record| {
format!("{} {}", record.count, record.comment)
}).collect();
let strings_joined: String = strings.join(",");
assert_eq!(strings_joined, "0 a,1 b,999 c");
}
#[test]
fn test_20000_parse_error() {
let data = "\
count;comment
bad29843;Expected unsigned, but got junk
";
let mut input: &[u8] = data.as_bytes();
let result = parse_csv_data::<Record>(&mut input);
assert_eq!(result.is_err(), true);
}
#[test]
fn test_20001_parse_error() {
let data = "\
count;comment
-29843;Expected unsigned, but got a negative value
";
let mut input: &[u8] = data.as_bytes();
let result = parse_csv_data::<Record>(&mut input);
assert_eq!(result.is_err(), true);
}
#[test]
fn test_20002_parse_error() {
let data = "\
count;comment
;Expected unsigned, but got an empty string
";
let mut input: &[u8] = data.as_bytes();
let result = parse_csv_data::<Record>(&mut input);
assert_eq!(result.is_err(), true);
}
}
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