tre-regex 0.6.0

Rust safe bindings to the TRE regex module
Documentation 
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// SPDX-License-Identifier: BSD-2-Clause
// See LICENSE file in the project root for full license text.

use crate::{RegApproxParams, RegcompFlags, Regex, RegexecFlags};

#[test]
fn test_regaexec() {
    let regcomp_flags = RegcompFlags::new()
        .add(RegcompFlags::EXTENDED)
        .add(RegcompFlags::ICASE);
    let regaexec_flags = RegexecFlags::new().add(RegexecFlags::NONE);
    let regaexec_params = RegApproxParams::new()
        .cost_ins(1)
        .cost_del(1)
        .cost_subst(1)
        .max_cost(2)
        .max_del(2)
        .max_ins(2)
        .max_subst(2)
        .max_err(2);

    let compiled_reg = Regex::new("^(hello).*(world)$", regcomp_flags).expect("Regex::new");
    let result = compiled_reg
        .regaexec(
            "hullo warld",    // String to match against
            &regaexec_params, // Matching parameters
            3,                // Number of matches we want
            regaexec_flags,   // Flags
        )
        .expect("regaexec");

    let matched = result.get_matches();

    let matched_0 = matched[0].as_ref();
    assert!(matched_0.is_some());
    assert_eq!(matched_0.copied(), Some("hullo warld"));

    let matched_1 = matched[1].as_ref();
    assert!(matched_1.is_some());
    assert_eq!(matched_1.copied(), Some("hullo"));

    let matched_2 = matched[2].as_ref();
    assert!(matched_2.is_some());
    assert_eq!(matched_2.copied(), Some("warld"));
}

#[test]
fn test_regaexec_bytes() {
    let regcomp_flags = RegcompFlags::new()
        .add(RegcompFlags::EXTENDED)
        .add(RegcompFlags::ICASE);
    let regaexec_flags = RegexecFlags::new().add(RegexecFlags::NONE);
    let regaexec_params = RegApproxParams::new()
        .cost_ins(1)
        .cost_del(1)
        .cost_subst(1)
        .max_cost(2)
        .max_del(2)
        .max_ins(2)
        .max_subst(2)
        .max_err(2);

    let compiled_reg = Regex::new_bytes(b"^(hello).*(world)$", regcomp_flags).expect("Regex::new");
    let result = compiled_reg
        .regaexec_bytes(
            b"hullo warld",   // String to match against
            &regaexec_params, // Matching parameters
            3,                // Number of matches we want
            regaexec_flags,   // Flags
        )
        .expect("regaexec");

    let matched = result.get_matches();

    let matched_0 = matched[0].as_ref();
    assert!(matched_0.is_some());
    assert_eq!(*matched_0.unwrap(), b"hullo warld");

    let matched_1 = matched[1].as_ref();
    assert!(matched_1.is_some());
    assert_eq!(*matched_1.unwrap(), b"hullo");

    let matched_2 = matched[2].as_ref();
    assert!(matched_2.is_some());
    assert_eq!(*matched_2.unwrap(), b"warld");
}

#[test]
fn regaexec_bytes_matches_non_utf8() {
    let flags = RegcompFlags::new().add(RegcompFlags::EXTENDED);
    let params = RegApproxParams::new()
        .cost_ins(1)
        .cost_del(1)
        .cost_subst(1)
        .max_cost(1)
        .max_del(1)
        .max_ins(1)
        .max_subst(1)
        .max_err(1);
    let regex = Regex::new_bytes(b"\xff", flags).expect("compile non-UTF-8 pattern");
    let result = regex
        .regaexec_bytes(b"\xfe", &params, 1, RegexecFlags::new())
        .expect("approximately match non-UTF-8 data");

    assert_eq!(result.cost(), 1);
    assert_eq!(result.get_matches()[0], Some(b"\xfe".as_slice()));
}