khive-text

Text analysis primitives for khive: tokenization, normalization, and token filtering. A pluggable Tokenizer -> TokenFilter chain composed into an Analyzer, plus named presets for common cases (standard English, CJK, identifiers, KG entity names).

Features

unicode — adds UnicodeWordTokenizer (Unicode word-boundary splitting via unicode-segmentation)
stem — adds SnowballStemmer, a TokenFilter backed by rust-stemmers (English by default via SnowballStemmer::english(), or any rust_stemmers::Algorithm via for_algorithm)
full — both of the above

Usage

use khive_text::{preset, Analyzer};

let tokens = preset::standard().analyze("The quick brown fox jumps over the lazy dog");
assert_eq!(tokens, vec!["quick", "brown", "fox", "jumps", "over", "lazy", "dog"]);

preset::standard() chains WhitespaceTokenizer with LowercaseFilter, a BM25-compatible stop-word filter, and MinLengthFilter(1) — producing the same token stream as khive-bm25's SimpleTokenizer::default() (same stop list, no max-length cap). This is intentionally different from the public StopWordFilter in khive_text::filter, which has its own stop list for callers building custom pipelines. Other named presets: preset::simple() (whitespace + lowercase only, keeps stop words), preset::keyword() (whole input as one token), preset::cjk() (character-level unigrams for CJK scripts, whitespace for Latin), and preset::kg_name() (identifier-aware splitting tuned for entity names like "bert-base-uncased"). Build a custom pipeline with the same builder:

use khive_text::analyzer::StandardAnalyzer;
use khive_text::filter::LowercaseFilter;
use khive_text::tokenizer::IdentifierTokenizer;

let analyzer = StandardAnalyzer::with_tokenizer(IdentifierTokenizer::default())
    .filter(LowercaseFilter);

Script detection

is_cjk_char, contains_cjk, and is_meaningful_query (a ScriptProfile-based heuristic for rejecting queries that are too short or punctuation-only to search on) live in the lang module for callers that need to branch on script before choosing an analyzer.

Where this sits

khive-text has no required khive-* dependencies. khive-bm25 consumes its tokenizer trait and normalization filters while retaining SimpleTokenizer as its compatibility-oriented configuration wrapper.

License