audiobookshelf/server/utils/index.js

69 lines
2.1 KiB
JavaScript

const Path = require('path')
const fs = require('fs')
const Logger = require('../Logger')
const levenshteinDistance = (str1, str2, caseSensitive = false) => {
if (!caseSensitive) {
str1 = str1.toLowerCase()
str2 = str2.toLowerCase()
}
const track = Array(str2.length + 1).fill(null).map(() =>
Array(str1.length + 1).fill(null));
for (let i = 0; i <= str1.length; i += 1) {
track[0][i] = i;
}
for (let j = 0; j <= str2.length; j += 1) {
track[j][0] = j;
}
for (let j = 1; j <= str2.length; j += 1) {
for (let i = 1; i <= str1.length; i += 1) {
const indicator = str1[i - 1] === str2[j - 1] ? 0 : 1;
track[j][i] = Math.min(
track[j][i - 1] + 1, // deletion
track[j - 1][i] + 1, // insertion
track[j - 1][i - 1] + indicator, // substitution
);
}
}
return track[str2.length][str1.length];
}
module.exports.levenshteinDistance = levenshteinDistance
const cleanString = (str) => {
if (!str) return ''
// Now supporting all utf-8 characters, can remove this method in future
// replace accented characters: https://stackoverflow.com/a/49901740/7431543
// str = str.normalize('NFD').replace(/[\u0300-\u036f]/g, "")
// const availableChars = " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
// const cleanChar = (char) => availableChars.indexOf(char) < 0 ? '?' : char
// var cleaned = ''
// for (let i = 0; i < str.length; i++) {
// cleaned += cleanChar(str[i])
// }
return cleaned.trim()
}
module.exports.cleanString = cleanString
module.exports.isObject = (val) => {
return val !== null && typeof val === 'object'
}
module.exports.comparePaths = (path1, path2) => {
return path1 === path2 || Path.normalize(path1) === Path.normalize(path2)
}
module.exports.getIno = (path) => {
return fs.promises.stat(path, { bigint: true }).then((data => String(data.ino))).catch((err) => {
Logger.error('[Utils] Failed to get ino for path', path, err)
return null
})
}
module.exports.isAcceptableCoverMimeType = (mimeType) => {
return mimeType && mimeType.startsWith('image/')
}