instant-segment 0.11.0

Fast English word segmentation
Documentation 
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use crate::{Search, Segmenter};

/// Run a segmenter against the built-in test cases
pub fn run(segmenter: &Segmenter) {
    let mut search = Search::default();
    assert_eq!(segmenter.segment("", &mut search).unwrap().len(), 0);

    let mut success = true;
    for test in TEST_CASES.iter().copied() {
        success &= assert_segments(test, &mut search, segmenter);
    }

    for test in FAILED.iter().copied() {
        success &= assert_segments(test, &mut search, segmenter);
    }

    assert!(success);
}

pub fn assert_segments(s: &[&str], search: &mut Search, segmenter: &Segmenter) -> bool {
    let words = segmenter.segment(&s.join(""), search).unwrap();
    let cmp = words.collect::<Vec<_>>();
    let success = cmp == s;
    if !success {
        println!("expected: {:?}", s);
        println!("actual:   {:?}\n", cmp);
    }
    success
}

pub fn check_segments(s: &[&str], search: &mut Search, segmenter: &Segmenter) -> bool {
    match segmenter.segment(&s.join(""), search) {
        Ok(words) => s == words.collect::<Vec<_>>(),
        Err(_) => false,
    }
}

/// Built-in test cases
///
/// These are exposed so that you can test with different data sources.
pub const TEST_CASES: &[&[&str]] = &[
    &["choose", "spain"],
    &["this", "is", "a", "test"],
    &["who", "represents"],
    &["experts", "exchange"],
    &["speed", "of", "art"],
    &["now", "is", "the", "time", "for", "all", "good"],
    &["it", "is", "a", "truth", "universally", "acknowledged"],
    &[
        "it", "was", "a", "bright", "cold", "day", "in", "april", "and", "the", "clocks", "were",
        "striking", "thirteen",
    ],
    &[
        "when",
        "in",
        "the",
        "course",
        "of",
        "human",
        "events",
        "it",
        "becomes",
        "necessary",
    ],
    &[
        "it",
        "was",
        "the",
        "best",
        "of",
        "times",
        "it",
        "was",
        "the",
        "worst",
        "of",
        "times",
        "it",
        "was",
        "the",
        "age",
        "of",
        "wisdom",
        "it",
        "was",
        "the",
        "age",
        "of",
        "foolishness",
    ],
    &[
        "in", "a", "hole", "in", "the", "ground", "there", "lived", "a", "hobbit", "not", "a",
        "nasty", "dirty", "wet", "hole", "filled", "with", "the", "ends", "of", "worms", "and",
        "an", "oozy", "smell", "nor", "yet", "a", "dry", "bare", "sandy", "hole", "with",
        "nothing", "in", "it", "to", "sit", "down", "on", "or", "to", "eat", "it", "was", "a",
        "hobbit", "hole", "and", "that", "means", "comfort",
    ],
];

/// Incorrectly segmented test cases
const FAILED: &[&[&str]] = &[
    &[
        // The SCOWL word list (at size 60) data does not contain "unregarded"
        "far",
        "out",
        "in",
        "the",
        "uncharted",
        "backwaters",
        "of",
        "the",
        "unfashionable",
        "end",
        "of",
        "the",
        "western",
        "spiral",
        "arm",
        "of",
        "the",
        "galaxy",
        "lies",
        "a",
        "small",
        "un",
        "regarded",
        "yellow",
        "sun",
    ],
    &[
        // The SCOWL word list (at size 60) does not contain "gregor"
        "as",
        "greg",
        "or",
        "sam",
        "s",
        "a",
        "awoke",
        "one",
        "morning",
        "from",
        "uneasy",
        "dreams",
        "he",
        "found",
        "himself",
        "transformed",
        "in",
        "his",
        "bed",
        "into",
        "a",
        "gigantic",
        "insect",
    ],
];