Hitomi - Language & Tag Filtering

Search Filters & UI Manipulations
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// ==UserScript==
// @name         Hitomi - Language & Tag Filtering
// @namespace    brazenvoid
// @version      2.6.0
// @author       brazenvoid
// @license      GPL-3.0-only
// @description  Search Filters & UI Manipulations
// @include      https://hitomi.la/*
// @run-at       document-idle
// ==/UserScript==

// Define languages to keep and tags to exclude here

let settings = {
  allowedGalleryTypes: [
    'artist cg',
    'doujinshi',
    'game cg',
    'manga',
  ],
  allowedLanguages: [
    'japanese',
    'korean',
    'english'
  ],
  excludedTags: [
    'anthology',
    'female:daughter',
    'female:females only',
    'female:mother',
    'sample',
    'male:father',
    'male:son',
    'male:yaoi',
  ],
  excludedTagGroups: [
    ['female:loli', 'female:sole female'],
    ['male:shota', 'male:sole male'],
  ],
  removeRelatedGalleries: true,
}

// Translate gallery types to css selectors

let allowedGallerySelectors = [], allowedGalleryTypeSelector

for (let allowedGalleryType of settings.allowedGalleryTypes) {
  switch (allowedGalleryType) {
    case 'anime':
      allowedGalleryTypeSelector = 'anime'
      break
    case 'artist cg':
      allowedGalleryTypeSelector = 'acg'
      break
    case 'doujinshi':
      allowedGalleryTypeSelector = 'dj'
      break
    case 'game cg':
      allowedGalleryTypeSelector = 'cg'
      break
    case 'manga':
      allowedGalleryTypeSelector = 'manga'
      break
    default:
      continue
  }
  allowedGallerySelectors.push(allowedGalleryTypeSelector)
}

// Formatting filters

let formatFilters = function (filters, prefix, suffix, join) {

  let formatFilter = function (filter) {
    return '[href="' + prefix + encodeURIComponent(filter) + suffix + '.html"]'
  }
  let index2
  for (let index = 0; index < filters.length; index++) {
    if (Array.isArray(filters[index])) {
      for (index2 = 0; index2 < filters[index].length; index2++) {
        filters[index][index2] = formatFilter(filters[index][index2])
      }
      filters[index] = filters[index].join(', ')
    } else {
      filters[index] = formatFilter(filters[index])
    }
  }
  return join ? filters.join(', ') : filters
}

let languageFiltersSelector = formatFilters(settings.allowedLanguages, '/index-', '-1', true)
let tagFiltersSelector = formatFilters(settings.excludedTags, '/tag/', '-all-1', true)
let tagGroupFiltersSelectors = formatFilters(settings.excludedTagGroups, '/tag/', '-all-1', false)

// Filtration logic

let validateLanguage = function (gallery) {

  let validationCheck = true

  if (settings.allowedLanguages.length > 0) {

    let languageTD = gallery.querySelector('tr:nth-child(3) > td:nth-child(2)')
    if (languageTD.querySelector('a') !== null) {
      validationCheck = languageTD.querySelectorAll(languageFiltersSelector).length > 0
    }
  }
  return validationCheck
}

let validateTags = function (gallery) {

  let validationCheck = true

  if (settings.excludedTags.length > 0) {
    validationCheck = gallery.querySelectorAll(tagFiltersSelector).length === 0
  }
  if (validationCheck && settings.excludedTagGroups.length > 0) {
    for (let tagGroupFilterSelector of tagGroupFiltersSelectors) {
      validationCheck = gallery.querySelectorAll(tagGroupFilterSelector).length < tagGroupFilterSelector.length
      if (!validationCheck) {
        break
      }
    }
  }
  return validationCheck
}

let validateType = function (gallery) {
  return allowedGallerySelectors.includes(gallery.className)
}

let complianceCallback = function (target) {

  let galleries = target.querySelectorAll('.anime, .manga, .dj, .acg, .cg')
  let validationCheck

  for (let gallery of galleries) {

    validationCheck = validateType(gallery) && validateLanguage(gallery) && validateTags(gallery)

    if (!validationCheck) {
      gallery.remove()
    }
  }
}

// Script Run

let galleriesList = document.querySelector('.gallery-content')
let isGalleryPage = document.getElementById('dl-button') !== null

if (isGalleryPage && settings.removeRelatedGalleries) {

  galleriesList.remove()

} else {

  let observerConfig = {
    attributes: false,
    childList: true,
    subtree: false
  }
  complianceCallback(galleriesList)

  // Adding observer to check compliance of galleries

  let observer = new MutationObserver(function (mutations) {
    for (let mutation of mutations) {
      complianceCallback(mutation.target)
    }
  })
  observer.observe(galleriesList, observerConfig)
}