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vendor/yomitan/js/app/theme-controller.js
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vendor/yomitan/js/app/theme-controller.js
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/*
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* Copyright (C) 2023-2025 Yomitan Authors
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* Copyright (C) 2022 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/**
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* This class is used to control theme attributes on DOM elements.
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*/
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export class ThemeController {
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/**
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* Creates a new instance of the class.
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* @param {?HTMLElement} element A DOM element which theme properties are applied to.
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*/
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constructor(element) {
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/** @type {?HTMLElement} */
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this._element = element;
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/** @type {import("settings.js").PopupTheme} */
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this._theme = 'site';
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/** @type {import("settings.js").PopupOuterTheme} */
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this._outerTheme = 'site';
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/** @type {?('dark'|'light')} */
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this._siteTheme = null;
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/** @type {'dark'|'light'} */
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this._browserTheme = 'light';
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/** @type {boolean} */
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this.siteOverride = false;
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}
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/**
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* Gets the DOM element which theme properties are applied to.
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* @type {?Element}
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*/
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get element() {
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return this._element;
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}
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/**
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* Sets the DOM element which theme properties are applied to.
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* @param {?HTMLElement} value The DOM element to assign.
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*/
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set element(value) {
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this._element = value;
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}
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/**
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* Gets the main theme for the content.
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* @type {import("settings.js").PopupTheme}
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*/
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get theme() {
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return this._theme;
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}
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/**
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* Sets the main theme for the content.
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* @param {import("settings.js").PopupTheme} value The theme value to assign.
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*/
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set theme(value) {
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this._theme = value;
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}
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/**
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* Gets the outer theme for the content.
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* @type {import("settings.js").PopupOuterTheme}
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*/
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get outerTheme() {
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return this._outerTheme;
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}
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/**
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* Sets the outer theme for the content.
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* @param {import("settings.js").PopupOuterTheme} value The outer theme value to assign.
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*/
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set outerTheme(value) {
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this._outerTheme = value;
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}
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/**
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* Gets the override value for the site theme.
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* If this value is `null`, the computed value will be used.
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* @type {?('dark'|'light')}
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*/
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get siteTheme() {
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return this._siteTheme;
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}
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/**
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* Sets the override value for the site theme.
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* If this value is `null`, the computed value will be used.
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* @param {?('dark'|'light')} value The site theme value to assign.
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*/
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set siteTheme(value) {
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this._siteTheme = value;
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}
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/**
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* Gets the browser's preferred color theme.
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* The value can be either 'light' or 'dark'.
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* @type {'dark'|'light'}
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*/
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get browserTheme() {
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return this._browserTheme;
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}
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/**
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* Prepares the instance for use and applies the theme settings.
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*/
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prepare() {
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const mediaQueryList = window.matchMedia('(prefers-color-scheme: dark)');
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mediaQueryList.addEventListener('change', this._onPrefersColorSchemeDarkChange.bind(this));
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this._onPrefersColorSchemeDarkChange(mediaQueryList);
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}
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/**
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* Updates the theme attributes on the target element.
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* If the site theme value isn't overridden, the current site theme is recomputed.
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*/
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updateTheme() {
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if (this._element === null) { return; }
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const computedSiteTheme = this._siteTheme !== null ? this._siteTheme : this.computeSiteTheme();
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const data = this._element.dataset;
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data.theme = this._resolveThemeValue(this._theme, computedSiteTheme);
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data.outerTheme = this._resolveThemeValue(this._outerTheme, computedSiteTheme);
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data.siteTheme = computedSiteTheme;
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data.browserTheme = this._browserTheme;
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data.themeRaw = this._theme;
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data.outerThemeRaw = this._outerTheme;
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}
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/**
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* Computes the current site theme based on the background color.
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* @returns {'light'|'dark'} The theme of the site.
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*/
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computeSiteTheme() {
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const color = [255, 255, 255];
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const {documentElement, body} = document;
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if (documentElement !== null) {
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this._addColor(color, window.getComputedStyle(documentElement).backgroundColor);
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}
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if (body !== null) {
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this._addColor(color, window.getComputedStyle(body).backgroundColor);
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}
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const dark = (color[0] < 128 && color[1] < 128 && color[2] < 128);
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return dark ? 'dark' : 'light';
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}
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/**
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* Event handler for when the preferred browser theme changes.
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* @param {MediaQueryList|MediaQueryListEvent} detail The object containing event details.
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*/
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_onPrefersColorSchemeDarkChange({matches}) {
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this._browserTheme = (matches ? 'dark' : 'light');
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this.updateTheme();
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}
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/**
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* Resolves a settings theme value to the actual value which should be used.
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* @param {string} theme The theme value to resolve.
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* @param {string} computedSiteTheme The computed site theme value to use for when the theme value is `'auto'`.
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* @returns {string} The resolved theme value.
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*/
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_resolveThemeValue(theme, computedSiteTheme) {
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switch (theme) {
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case 'site': return this.siteOverride ? this._browserTheme : computedSiteTheme;
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case 'browser': return this._browserTheme;
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default: return theme;
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}
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}
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/**
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* Adds the value of a CSS color to an accumulation target.
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* @param {number[]} target The target color buffer to accumulate into, as an array of [r, g, b].
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* @param {string|*} cssColor The CSS color value to add to the target. If this value is not a string,
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* the target will not be modified.
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*/
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_addColor(target, cssColor) {
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if (typeof cssColor !== 'string') { return; }
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const color = this._getColorInfo(cssColor);
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if (color === null) { return; }
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const a = color[3];
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if (a <= 0) { return; }
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const aInv = 1 - a;
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for (let i = 0; i < 3; ++i) {
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target[i] = target[i] * aInv + color[i] * a;
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}
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}
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/**
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* Decomposes a CSS color string into its RGBA values.
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* @param {string} cssColor The color value to decompose. This value is expected to be in the form RGB(r, g, b) or RGBA(r, g, b, a).
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* @returns {?number[]} The color and alpha values as [r, g, b, a]. The color component values range from [0, 255], and the alpha ranges from [0, 1].
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*/
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_getColorInfo(cssColor) {
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const m = /^\s*rgba?\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*([\d.]+)\s*)?\)\s*$/.exec(cssColor);
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if (m === null) { return null; }
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const m4 = m[4];
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return [
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Number.parseInt(m[1], 10),
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Number.parseInt(m[2], 10),
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Number.parseInt(m[3], 10),
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m4 ? Math.max(0, Math.min(1, Number.parseFloat(m4))) : 1,
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];
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}
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}
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