wfdb_rust/
lib.rs

1//! `wfdb-rust` is a basic library for parsing WFDB-format datasets from PhysioNet. At this time,
2//! it does not intend to be a complete WFDB library; instead, it focuses strictly on reading WFDB
3//! datasets (not writing them).
4//!
5//! The motivation for this library was to find an easier way to parse datasets from PhysioNet in
6//! other Rust projects.
7extern crate regex;
8
9use std::fs::{read_to_string, read};
10use std::path::{Path, PathBuf};
11use std::collections::HashMap;
12
13pub mod header;
14pub mod signal;
15
16/// Parse the WFDB signals based on information in the header. This returns the parsed header as
17/// well as a Vec<i16> for each signal listed in the header.
18pub fn parse_wfdb(header_path: &Path) -> (header::Header, Vec<Vec<i16>>) {
19    let header = header::read_header(&read_to_string(header_path).unwrap());
20    let mut signals = vec![];
21    let data_directory = header_path.parent().unwrap();
22    let mut parsed_files = HashMap::new();
23    let mut signals_in_file = HashMap::new();
24    let mut signal_index_in_file = HashMap::new();
25
26    for signal in &header.signal_specs {
27        signals_in_file.entry(&signal.filename).and_modify(|v| *v += 1).or_insert(1);
28    }
29
30    for signal in &header.signal_specs {
31        let buf = parsed_files.entry(&signal.filename).or_insert_with(|| {
32            let signal_path = PathBuf::from(&signal.filename);
33            if (&signal_path).is_absolute() {
34                read(&signal_path).unwrap()
35            } else {
36                let full_path = data_directory.join(&signal_path);
37                read(&full_path).unwrap()
38            }
39        });
40        let signal_idx = signal_index_in_file.entry(&signal.filename).and_modify(|v| *v += 1).or_insert(0);
41        let num_signals_in_file = signals_in_file.entry(&signal.filename).or_insert(1);
42
43        let new_signal: Vec<i16> = signal::parse_212_format(&buf).into_iter().skip(*signal_idx).step_by(*num_signals_in_file).collect();
44        signals.push(new_signal);
45    }
46    (header, signals)
47}
wfdb_rust/lib.rs

wfdb_rust/
lib.rs
