This crate provides a streaming CSV (comma separated values) writer and
reader that works with the `serialize` crate to do type based encoding
and decoding. There are two primary goals of this project:
1. The default mode of parsing should *just work*. This means the parser
will bias toward providing *a* parse over a *correct* parse (with
respect to [RFC 4180](http://tools.ietf.org/html/rfc4180)).
2. Convenient to use by default, but when performance is needed, the
API will provide an escape hatch.
[](https://travis-ci.org/BurntSushi/rust-csv)
Licensed under the [UNLICENSE](http://unlicense.org).
### Documentation
The API is fully documented with lots of examples:
[http://burntsushi.net/rustdoc/csv/](http://burntsushi.net/rustdoc/csv/).
### Simple examples
Here is a full working Rust program that decodes records from a CSV file. Each
record consists of two strings and an integer (the edit distance between the
strings):
```rust
extern crate csv;
use std::path::Path;
fn main() {
let fp = &Path::new("./data/simple.csv");
let mut rdr = csv::Reader::from_file(fp);
for record in rdr.decode() {
let (s1, s2, dist): (String, String, uint) = record.unwrap();
println!("({}, {}): {}", s1, s2, dist);
}
}
```
Don't like tuples? That's fine. Use a struct instead:
```rust
extern crate csv;
extern crate serialize;
use std::path::Path;
#[deriving(Decodable)]
struct Record {
s1: String,
s2: String,
dist: uint,
}
fn main() {
let fp = &Path::new("./data/simple.csv");
let mut rdr = csv::Reader::from_file(fp);
for record in rdr.decode() {
let record: Record = record.unwrap();
println!("({}, {}): {}", record.s1, record.s2, record.dist);
}
}
```
Do some records not have a distance for some reason? Use an `Option` type!
```rust
#[deriving(Decodable)]
struct Record {
s1: String,
s2: String,
dist: Option<uint>,
}
```
You can also read CSV headers, change the delimiter, use `enum` types or just
get plain access to records as vectors of strings. There are examples with more
details in the documentation.
### Installation
This crate works with Cargo and is on
[crates.io](https://crates.io/crates/csv). The package is regularly updated.
Add is to your `Cargo.toml` like so:
```toml
[dependencies]
csv = "*"
# other deps...
```
### Benchmarks
There are some rough benchmarks (compared with Go) here:
https://github.com/BurntSushi/rust-csv/tree/master/bench