# All files / searching fuzzy.ts

100% Statements 175/175
100% Branches 3/3
100% Functions 3/3
100% Lines 175/175

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     import { type TextExtractor } from "../types.js";
    import { type BaseSearchOptions } from "./types.js";
    import { defaultExtractor, search } from "./utils.js";

    /**
     * @example
     * ```tsx
     * import { createFuzzyRegExp, toSearchQuery } from "@react-md/core":
     * import { useDeferredValue, useMemo, useState, type ReactElement } from "react";
     *
     * function Example(): ReactElement {
     *   const [value, setValue] = useState("");
     *   const deferredValue = useDeferredValue(value)
     *
     *   const match = useMemo(() => {
     *     const query = toSearchQuery(deferredValue);
     *     if (!query) {
     *       return;
     *     }
     *
     *     const fuzzyRegExp = createFuzzyRegExp(query);
     *     return options.find(option => fuzzyRegExp.test(option.label)):
     *   }, [options])
     *
     *   if (match) {
     *     // do something
     *   }
     * }
     *
     * ```
     *
     * @remarks \@since 6.0.0
     * @see {@link fuzzySearch}
     */
    export function createFuzzyRegExp(query: string): RegExp {
      return new RegExp(
        query
          .split("")
          .join("\\w*")
          .replace(/(\(|\||\)|\\(?!w\*)|\[|\|-|\.|\^|\+|\$|\?|^(?!w)\*)/g, "\\$1")
          // Couldn't get the matching of two '*' working, so replace them here..
          .replace(/\*\*/g, "*\\*"),
        "i"
      );
    }

    /**
     * @remarks \@since 6.0.0
     */
    export type FuzzySearchOptions<T> = BaseSearchOptions<T>;

    /**
     * Filters a list by making sure that all the letters appear in order ignoring
     * case, punctuation, whitespace, and special characters. This is kind of the
     * same filtering that appears in text editors.
     *
     * @example
     * Simple Example
     * ```ts
     * const list = [
     *   "at",
     *   "charAt",
     *   "charCodeAt",
     *   "codePointAt",
     *   "concat",
     *   "constructor",
     *   "endsWith",
     *   "includes",
     *   "indexOf",
     *   "lastIndexOf",
     *   "length",
     *   "localeCompare",
     *   "match",
     *   "matchAll",
     *   "normalize",
     *   "padEnd",
     *   "padStart",
     *   "repeat",
     *   "replace",
     *   "replaceAll",
     *   "search",
     *   "slice",
     *   "split",
     *   "startsWith",
     *   "substring",
     *   "toLocaleLowerCase",
     *   "toLocaleUpperCase",
     *   "toLowerCase",
     *   "toString",
     *   "toUpperCase",
     *   "trim",
     *   "trimEnd",
     *   "trimStart",
     *   "valueOf",
     * ];
     *
     * fuzzySearch({
     *   list,
     *   query: "la",
     * });
     * // [
     * //   "lastIndexOf",
     * //    ^^
     * //   "localeCompare",
     * //    ^  ^
     * //   "replace",
     * //       ^^
     * //   "replaceAll",
     * //       ^^
     * //   "toLocaleLowerCase",
     * //      ^  ^
     * //   "toLocaleUpperCase",
     * //      ^  ^
     * //   "toLowerCase",
     * //      ^     ^
     * // ]
     *
     * fuzzySearch({
     *   list,
     *   query: "ad",
     *   type: "search",
     * });
     * // "charCodeAt"
     *  //    ^   ^
     * ```
     *
     * @remarks \@since 6.0.0
     */
    export function fuzzySearch<T extends string>(
      options: Omit<FuzzySearchOptions<T>, "extractor"> & { type?: "filter" }
    ): readonly T[];
    export function fuzzySearch<T extends string>(
      options: Omit<FuzzySearchOptions<T>, "extractor"> & { type?: "search" }
    ): T | undefined;
    export function fuzzySearch<T>(
      option: FuzzySearchOptions<T> & {
        extractor: TextExtractor<T>;
        type?: "filter";
      }
    ): readonly T[];
    export function fuzzySearch<T>(
      option: FuzzySearchOptions<T> & {
        extractor: TextExtractor<T>;
        type?: "search";
      }
    ): T | undefined;
    export function fuzzySearch<T>(
      options: FuzzySearchOptions<T>
    ): readonly T[] | T | undefined {
      const {
        list,
        type = "filter",
        query,
        extractor = defaultExtractor("fuzzySearch"),
        whitespace,
      } = options;

      // lazy initialize the RegExp since the base `filter` function will modify the
      // query and never call the filter function if:
      // - there is no query
      // - the list is empty
      let regexp: RegExp;
      return search({
        type,
        list,
        query,
        extractor,
        whitespace,
        filter(query, value) {
          return (
            value.length > 0 && (regexp ??= createFuzzyRegExp(query)).test(value)
          );
        },
      });
    }