calamine

A Excel file reader, in pure Rust.

Documentation

Description

calamine is a pure Rust library to read any excel file (xls, xlsx, xlsm, xlsb).

As long as your files are simple enough, this library should just work. For anything else, please file an issue with a failing test or send a pull request!

Examples

Simple

let mut excel = Excel::open("file.xlsx").unwrap();
let r = excel.worksheet_range("Sheet1").unwrap();
for row in r.rows() {
    println!("row={:?}, row[0]={:?}", row, row[0]);
}

More complex

use calamine::{Excel, Range, DataType};

// opens a new workbook
let path = "/path/to/my/excel/file.xlsm";
let mut workbook = Excel::open(path).unwrap();

// Read whole worksheet data and provide some statistics
if let Ok(range) = workbook.worksheet_range("Sheet1") {
    let total_cells = range.get_size().0 * range.get_size().1;
    let non_empty_cells: usize = range.rows().map(|r| {
        r.iter().filter(|cell| cell != &&DataType::Empty).count()
    }).sum();
    println!("Found {} cells in 'Sheet1', including {} non empty cells",
             total_cells, non_empty_cells);
}

// Check if the workbook has a vba project
if workbook.has_vba() {
    let mut vba = workbook.vba_project().expect("Cannot find VbaProject");
    let vba = vba.to_mut();
    let module1 = vba.get_module("Module 1").unwrap();
    println!("Module 1 code:");
    println!("{}", module1);
    for r in vba.get_references() {
        if r.is_missing() {
            println!("Reference {} is broken or not accessible", r.name);
        }
    }
}

Others

Browse the examples directory.

Performance

While there is no official benchmark yet, my first tests show a significant boost compared to official C# libraries:

• Reading cell values: at least 3 times faster
• Reading vba code: calamine does not read all sheets when opening your workbook, this is not fair

Unsupported

Many (most) part of the specifications are not implemented, the focus has been put on reading cell values and vba code.

The main unsupported items are:

• no support for writing excel files, this is a read-only libray
• no support for reading extra contents, such as formatting, excel parameter, encrypted components etc ...
• no support for decoding MBSC vba code, only tries to decode as normal utf8, which is ok most of the time but not accurate

Credits

Thanks to xlsx-js developpers! This library is by far the simplest open source implementation I could find and helps making sense out of official documentation.

License

MIT