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Readability Line Gradient

Color lines to assist eye transistion similar to BeeLine Reader. Uses Lining.js for (responsive) DOM wrapping of paragraph text.

Verze ze dne 16. 03. 2020. Zobrazit nejnovější verzi.

// ==UserScript==
// @name         Readability Line Gradient
// @namespace    https://neekleer.tacden.net/
// @version      0.3.1
// @description  Color lines to assist eye transistion similar to BeeLine Reader. Uses Lining.js for (responsive) DOM wrapping of paragraph text.
// @author       neekleer
// @match        http*://*.storiesonline.net/s/*
// @match        http*://*.novelfull.com/*/*.html
// @match        http*://*.novelplanet.com/Novel/*/*
// @grant        GM_addStyle
// @require      https://cdn.jsdelivr.net/lining.js/0.3.3/lining.min.js
// ==/UserScript==

;(function () {
  'use strict'
  if (typeof window.lining !== 'function') return

  function getContrastYIQ (color) {
    let parsed = color.match(
      /^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)$/
    )
    let r, g, b
    r = g = b = 255
    if (parsed) {
      if (parsed.length >= 4) {
        r = parsed[1]
        g = parsed[2]
        b = parsed[3]
      }
    } else {
      parsed = color
        .replace('#', '')
        .padEnd(6, '0')
        .match(/^([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})$/)
      if (parsed.length >= 4) {
        r = parseInt(parsed[1], 16)
        g = parseInt(parsed[2], 16)
        b = parseInt(parsed[3], 16)
      }
    }

    return (r * 299 + g * 587 + b * 114) / 1000 < 128
  }

  let mainContainer = document.body
  if (window.location.hostname.endsWith('novelfull.com')) {
    const container = document.getElementById('container')
    if (container) {
      mainContainer = container
    }
  }

  const darkMode = getContrastYIQ(
    window.getComputedStyle(mainContainer).getPropertyValue('background-color')
  )
  const colorA = darkMode ? '#C1C1C1' : '#000'
  const colorB = darkMode ? '#FB6558' : '#0F52BA'
  const colorC = darkMode ? '#377BE6' : '#E34234'

  function run () {
    setTimeout(() => {
      const elements = document.querySelectorAll('p:not(:empty)')
      for (let i = elements.length - 1; i >= 0; i--) {
        window.lining(elements[i], { autoResize: true })
      }
    }, 1000)
  }

  run()

  const lineSpec = [
    ['3n - 2', colorA, colorA, colorB],
    ['3n - 1', colorB, colorA, colorC],
    ['3n', colorC, colorA, colorA]
  ]

  for (let i = 0, l = lineSpec.length; i < l; i++) {
    const multExpr = lineSpec[i].shift()
    const colorList = lineSpec[i]
    lineSpec[
      i
    ] = `p .line:nth-of-type(${multExpr}){background:linear-gradient(90deg,${colorList.join()});color:transparent;background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}`
    if (colorList.pop() !== colorA) {
      colorList.push(colorA)
      lineSpec[
        i
      ] += `\np .line[last]:nth-of-type(${multExpr}){background:linear-gradient(90deg,${colorList.join()});color:transparent;background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}`
    }
  }
  GM_addStyle(lineSpec.join('\n'))
})()