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use crate::Table;
use ::csv as csv_lib;
use std::{fs::File, io, path::Path};
#[cfg_attr(feature = "docs", doc(cfg(csv)))]
pub trait FromCsv {
type Output;
fn from_csv<R: io::Read>(reader: R) -> io::Result<Self::Output>;
#[inline]
fn from_csv_str(s: &str) -> io::Result<Self::Output> {
Self::from_csv(s.as_bytes())
}
#[inline]
fn from_csv_file<P: AsRef<Path>>(p: P) -> io::Result<Self::Output> {
Self::from_csv(File::open(p)?)
}
}
impl<T: Table<Data = String> + Default> FromCsv for T {
type Output = T;
fn from_csv<R: io::Read>(reader: R) -> io::Result<Self::Output> {
let mut table = T::default();
let mut rdr = csv_lib::ReaderBuilder::new()
.has_headers(false)
.from_reader(reader);
for (row, result) in rdr.records().enumerate() {
let record = result?;
for col in 0..record.len() {
table.insert_cell(row, col, record[col].to_string());
}
}
Ok(table)
}
}
#[cfg_attr(feature = "docs", doc(cfg(csv)))]
pub trait ToCsv {
fn to_csv<W: io::Write>(&self, writer: W) -> io::Result<()>;
#[inline]
fn to_csv_str(&self) -> io::Result<String> {
let mut buf = Vec::new();
self.to_csv(&mut buf)?;
Ok(String::from_utf8_lossy(&buf).to_string())
}
#[inline]
fn to_csv_file<P: AsRef<Path>>(&self, p: P) -> io::Result<()> {
self.to_csv(File::create(p)?)
}
}
impl<D: AsRef<[u8]>, T: Table<Data = D>> ToCsv for T {
fn to_csv<W: io::Write>(&self, writer: W) -> io::Result<()> {
let mut wtr = csv_lib::WriterBuilder::new()
.has_headers(false)
.from_writer(writer);
for row in self.rows() {
wtr.write_record(row)?;
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::io::{Read, Write};
use tempfile::NamedTempFile;
type TestTable<T> = crate::DynamicTable<T>;
#[test]
fn from_csv_str_should_convert_into_table() {
let table = TestTable::from_csv_str("a,b,c\nd,e,f\n").unwrap();
assert_eq!(table.row_cnt(), 2);
assert_eq!(table.col_cnt(), 3);
assert_eq!(table[(0, 0)], "a");
assert_eq!(table[(0, 1)], "b");
assert_eq!(table[(0, 2)], "c");
assert_eq!(table[(1, 0)], "d");
assert_eq!(table[(1, 1)], "e");
assert_eq!(table[(1, 2)], "f");
}
#[test]
fn from_csv_file_should_convert_into_table() {
let mut file = NamedTempFile::new().unwrap();
writeln!(&mut file, "a,b,c\nd,e,f").unwrap();
let table = TestTable::from_csv_file(file).unwrap();
assert_eq!(table.row_cnt(), 2);
assert_eq!(table.col_cnt(), 3);
assert_eq!(table[(0, 0)], "a");
assert_eq!(table[(0, 1)], "b");
assert_eq!(table[(0, 2)], "c");
assert_eq!(table[(1, 0)], "d");
assert_eq!(table[(1, 1)], "e");
assert_eq!(table[(1, 2)], "f");
}
#[test]
fn to_csv_str_should_convert_into_csv() {
let mut file = NamedTempFile::new().unwrap();
let mut table = TestTable::new();
table.push_row(vec!["a", "b", "c"]);
table.push_row(vec!["d", "e", "f"]);
table.to_csv_file(file.path()).unwrap();
let mut buffer = String::new();
file.read_to_string(&mut buffer).unwrap();
assert_eq!(buffer, "a,b,c\nd,e,f\n")
}
}