refined-text-search/dist/src/index.js

Tokenize a search query with refined options (like Google's) and match against a target

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.match = exports.tokenizeClause = exports.tokenize = void 0;
const pattern = /(=|-)?("[^"]*"|[^\s]+)/g;
function tokenize(query) {
    query = query.toLowerCase().trim();
    const orClauses = query.split(/ or | \| /);
    if (orClauses.length === 1) {
        return tokenizeClause(orClauses[0]);
    }
    return [{ or: true, children: orClauses.map(tokenizeClause) }];
}
exports.tokenize = tokenize;
function tokenizeClause(query) {
    const tokens = [];
    let matched;
    while ((matched = pattern.exec(query))) {
        const prefix = matched[1];
        let term = matched[2];
        term = term.replace(/(^"|"$)/g, '');
        const exclude = prefix === '-' ? true : undefined;
        const exact = prefix === '=' ? true : undefined;
        tokens.push(Object.assign(Object.assign({ term }, (exclude ? { exclude } : {})), (exact ? { exact } : {})));
    }
    tokens.sort((a, b) => (a.exclude === b.exclude ? 0 : a.exclude ? -1 : 1));
    return tokens;
}
exports.tokenizeClause = tokenizeClause;
function match(tokens, text) {
    text = text.replace(/\s+/g, ' ').trim().toLowerCase();
    for (let i = 0; i !== tokens.length; i++) {
        const token = tokens[i];
        if ('or' in token) {
            return token.children.some((childTokens) => match(childTokens, text));
        }
        const textMatch = token.exact ? text === token.term : text.indexOf(token.term) !== -1;
        if (token.exclude && textMatch) {
            return false;
        }
        if (!token.exclude && !textMatch) {
            return false;
        }
    }
    return true;
}
exports.match = match;
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