The Rust CSV crate is a library for reading and writing Comma-Separated Values files. The crate provides a fast and efficient way to work with CSV data, and supports a wide range of formats and options.
The main types provided by the CSV crate are the Reader and Writer types. The Reader type represents a CSV reader that can be used to read CSV data from a file or a stream. The Writer type represents a CSV writer that can be used to write CSV data to a file or a stream. Both types support a wide range of options for controlling the CSV parsing and formatting behavior, such as delimiter, quoting, escaping, and encoding.
The CSV crate also provides a range of other useful types and functions, such as the ByteRecord type for representing CSV records as byte arrays, the StringRecord type for representing CSV records as UTF-8 strings, and the Serde integration for easy serialization and deserialization of CSV data.
The CSV crate is highly performant and is designed to handle large files efficiently. It provides optimizations, such as lazy parsing and zero-copy parsing, to minimize memory usage and improve performance.
Example:
let mut file = File::open("spreadsheet.csv").unwrap();
let mut contents = String::new();
file.read_to_string(&mut contents).unwrap();
let mut reader = ReaderBuilder::new()
.has_headers(true)
.delimiter(b',')
.from_reader(contents.as_bytes());
for result in reader.records() {
let record = result.unwrap();
println!("{:?}", record);
}