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* @param {string} name
* @param {string[]} names
* @returns {string | null}
*/
export default function fuzzymatch(name, names) {
if (names.length === 0) return null;
const set = new FuzzySet(names);
const matches = set.get(name);
return matches && matches[0][0] > 0.7 ? matches[0][1] : null;
}
// adapted from https://github.com/Glench/fuzzyset.js/blob/master/lib/fuzzyset.js
// BSD Licensed
const GRAM_SIZE_LOWER = 2;
const GRAM_SIZE_UPPER = 3;
// return an edit distance from 0 to 1
/**
* @param {string} str1
* @param {string} str2
*/
function _distance(str1, str2) {
if (str1 === null && str2 === null) {
throw 'Trying to compare two null values';
}
if (str1 === null || str2 === null) return 0;
str1 = String(str1);
str2 = String(str2);
const distance = levenshtein(str1, str2);
return 1 - distance / Math.max(str1.length, str2.length);
}
// helper functions
/**
* @param {string} str1
* @param {string} str2
*/
function levenshtein(str1, str2) {
/** @type {number[]} */
const current = [];
let prev = 0;
let value = 0;
for (let i = 0; i <= str2.length; i++) {
for (let j = 0; j <= str1.length; j++) {
if (i && j) {
if (str1.charAt(j - 1) === str2.charAt(i - 1)) {
value = prev;
} else {
value = Math.min(current[j], current[j - 1], prev) + 1;
}
} else {
value = i + j;
}
prev = current[j];
current[j] = value;
}
}
return /** @type {number} */ (current.pop());
}
const non_word_regex = /[^\w, ]+/;
/**
* @param {string} value
* @param {any} gram_size
*/
function iterate_grams(value, gram_size = 2) {
const simplified = '-' + value.toLowerCase().replace(non_word_regex, '') + '-';
const len_diff = gram_size - simplified.length;
const results = [];
if (len_diff > 0) {
for (let i = 0; i < len_diff; ++i) {
value += '-';
}
}
for (let i = 0; i < simplified.length - gram_size + 1; ++i) {
results.push(simplified.slice(i, i + gram_size));
}
return results;
}
/**
* @param {string} value
* @param {any} gram_size
*/
function gram_counter(value, gram_size = 2) {
// return an object where key=gram, value=number of occurrences
/** @type {Record<string, number>} */
const result = {};
const grams = iterate_grams(value, gram_size);
let i = 0;
for (i; i < grams.length; ++i) {
if (grams[i] in result) {
result[grams[i]] += 1;
} else {
result[grams[i]] = 1;
}
}
return result;
}
/**
* @param {MatchTuple} a
* @param {MatchTuple} b
*/
function sort_descending(a, b) {
return b[0] - a[0];
}
class FuzzySet {
/** @type {Record<string, string>} */
exact_set = {};
/** @type {Record<string, [number, number][]>} */
match_dict = {};
/** @type {Record<string, number[]>} */
items = {};
/** @param {string[]} arr */
constructor(arr) {
// initialisation
for (let i = GRAM_SIZE_LOWER; i < GRAM_SIZE_UPPER + 1; ++i) {
this.items[i] = [];
}
// add all the items to the set
for (let i = 0; i < arr.length; ++i) {
this.add(arr[i]);
}
}
/** @param {string} value */
add(value) {
const normalized_value = value.toLowerCase();
if (normalized_value in this.exact_set) {
return false;
}
let i = GRAM_SIZE_LOWER;
for (i; i < GRAM_SIZE_UPPER + 1; ++i) {
this._add(value, i);
}
}
/**
* @param {string} value
* @param {number} gram_size
*/
_add(value, gram_size) {
const normalized_value = value.toLowerCase();
const items = this.items[gram_size] || [];
const index = items.length;
items.push(0);
const gram_counts = gram_counter(normalized_value, gram_size);
let sum_of_square_gram_counts = 0;
let gram;
let gram_count;
for (gram in gram_counts) {
gram_count = gram_counts[gram];
sum_of_square_gram_counts += Math.pow(gram_count, 2);
if (gram in this.match_dict) {
this.match_dict[gram].push([index, gram_count]);
} else {
this.match_dict[gram] = [[index, gram_count]];
}
}
const vector_normal = Math.sqrt(sum_of_square_gram_counts);
// @ts-ignore no idea what this code is doing
items[index] = [vector_normal, normalized_value];
this.items[gram_size] = items;
this.exact_set[normalized_value] = value;
}
/** @param {string} value */
get(value) {
const normalized_value = value.toLowerCase();
const result = this.exact_set[normalized_value];
if (result) {
return /** @type {MatchTuple[]} */ ([[1, result]]);
}
// start with high gram size and if there are no results, go to lower gram sizes
for (let gram_size = GRAM_SIZE_UPPER; gram_size >= GRAM_SIZE_LOWER; --gram_size) {
const results = this.__get(value, gram_size);
if (results.length > 0) return results;
}
return null;
}
/**
* @param {string} value
* @param {number} gram_size
* @returns {MatchTuple[]}
*/
__get(value, gram_size) {
const normalized_value = value.toLowerCase();
/** @type {Record<string, number>} */
const matches = {};
const gram_counts = gram_counter(normalized_value, gram_size);
const items = this.items[gram_size];
let sum_of_square_gram_counts = 0;
let gram;
let gram_count;
let i;
let index;
let other_gram_count;
for (gram in gram_counts) {
gram_count = gram_counts[gram];
sum_of_square_gram_counts += Math.pow(gram_count, 2);
if (gram in this.match_dict) {
for (i = 0; i < this.match_dict[gram].length; ++i) {
index = this.match_dict[gram][i][0];
other_gram_count = this.match_dict[gram][i][1];
if (index in matches) {
matches[index] += gram_count * other_gram_count;
} else {
matches[index] = gram_count * other_gram_count;
}
}
}
}
const vector_normal = Math.sqrt(sum_of_square_gram_counts);
/** @type {MatchTuple[]} */
let results = [];
let match_score;
// build a results list of [score, str]
for (const match_index in matches) {
match_score = matches[match_index];
// @ts-ignore no idea what this code is doing
results.push([match_score / (vector_normal * items[match_index][0]), items[match_index][1]]);
}
results.sort(sort_descending);
/** @type {MatchTuple[]} */
let new_results = [];
const end_index = Math.min(50, results.length);
// truncate somewhat arbitrarily to 50
for (let i = 0; i < end_index; ++i) {
// @ts-ignore no idea what this code is doing
new_results.push([_distance(results[i][1], normalized_value), results[i][1]]);
}
results = new_results;
results.sort(sort_descending);
new_results = [];
for (let i = 0; i < results.length; ++i) {
if (results[i][0] === results[0][0]) {
// @ts-ignore no idea what this code is doing
new_results.push([results[i][0], this.exact_set[results[i][1]]]);
}
}
return new_results;
}
}
/** @typedef {[score: number, match: string]} MatchTuple */
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