2020-01-25 15:27:31 +01:00
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="author" content="Felix W. Dekker" />
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<meta name="application-name" content="Converter" />
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<meta name="description" content="Converts numbers to and from various bases." />
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<meta name="theme-color" content="#0033cc" />
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<title>Doomsday | FWDekker</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300italic,700,700italic"
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crossorigin="anonymous" />
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integrity="sha256-l85OmPOjvil/SOvVt3HnSSjzF1TUMyT9eV0c2BzEGzU=" crossorigin="anonymous" />
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/milligram/1.3.0/milligram.min.css"
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integrity="sha256-Ro/wP8uUi8LR71kwIdilf78atpu8bTEwrK5ZotZo+Zc=" crossorigin="anonymous" />
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<link rel="stylesheet" href="https://static.fwdekker.com/css/milligram-common.css" crossorigin="anonymous" />
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<style>
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.invisible {
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display: none;
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}
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2020-01-25 17:30:26 +01:00
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.success-message {
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color: green;
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}
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2020-01-25 16:31:59 +01:00
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.error-message {
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color: red;
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}
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input[data-entered=true]:valid {
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border-color: green;
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color: green;
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}
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input[data-entered=true]:invalid {
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border-color: red;
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color: red;
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}
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</style>
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</head>
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<body>
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<main class="wrapper">
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<!-- Header -->
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<header class="header">
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<section class="container">
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<h1>Doomsday</h1>
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<blockquote>
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<p><em>
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Test your mastery of <a href="https://en.wikipedia.org/wiki/Doomsday_rule">Conway's Doomsday</a>
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rule.
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</em></p>
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</blockquote>
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</section>
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</header>
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<!-- Input -->
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<section class="container">
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<form>
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<p>
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<label for="century-input" id="century-title-label">Century</label>
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<input type="text" id="century-input" autocomplete="off" autofocus />
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<span class="error-message invisible" id="century-error-label"></span>
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</p>
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<p>
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<label for="year-input" id="year-title-label">Year</label>
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<input type="text" id="year-input" autocomplete="off" />
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<span class="error-message invisible" id="year-error-label"></span>
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</p>
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<p>
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<label for="day-input" id="day-title-label">Day</label>
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<input type="text" id="day-input" autocomplete="off" />
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<span class="error-message invisible" id="day-error-label"></span>
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</p>
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</form>
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</section>
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<!-- Footer -->
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<footer class="footer">
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<section class="container">
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Made by <a href="https://fwdekker.com/">Felix W. Dekker</a>.
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Licensed under the
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<a href="https://git.fwdekker.com/FWDekker/doomsday/src/branch/master/LICENSE">MIT License</a>.
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Source code available on <a href="https://git.fwdekker.com/FWDekker/doomsday/">git</a>.
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</section>
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</footer>
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</main>
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<!-- Scripts -->
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<script src="https://static.fwdekker.com/js/common.js" crossorigin="anonymous"></script>
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<script>
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/**
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* Returns a number between `min` (inclusive) and `max` (inclusive).
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*
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* @param min the lower bound of permissible values
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* @param max the upper bound of permissible values
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*/
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function generateRandom(min, max) {
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return Math.floor(Math.random() * (max - min + 1) + min);
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}
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2020-01-25 17:18:50 +01:00
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/**
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* Given an expected value and an actual value, interprets the actual value as a weekday and returns `null` if they
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* are equal; returns an empty string if they are not equal; and returns an error message otherwise.
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*
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* @param expected the weekday that `actual` should be equal to
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* @param actual the weekday to compare to `expected`
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*/
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function compareWeekdays(expected, actual) {
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switch (DoomsdayDate.expandDayString(actual)) {
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case expected:
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return null;
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case undefined:
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return "Unrecognized day of week.";
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default:
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return "";
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}
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}
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/**
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* An input that can be validated.
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*
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* In particular, the century, year, and day inputs of the Doomsday test.
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*/
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class ValidatableInput {
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/**
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* Constructs a new validatable input and registers event listeners.
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*
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* @param input the input that is validatable
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* @param titleLabel the label with the `labelFor` property for the input given as the first parameter
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* @param errorLabel the label to display errors in
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*/
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constructor(input, titleLabel, errorLabel) {
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this.input = input;
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this.titleLabel = titleLabel;
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this.errorLabel = errorLabel;
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this.input.addEventListener("keydown", event => {
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if (event.key !== "Enter")
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return;
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this.input.dataset["entered"] = "true";
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const errorMessage = this.validate(this.input.value);
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if (errorMessage === null) {
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this.showSuccess();
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this.onValidInput();
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} else {
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this.showError(errorMessage);
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this.selectInput();
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this.onInvalidInput();
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}
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});
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}
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/**
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* Returns `null` if the input is valid, or an error message explaining why it is invalid otherwise.
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*
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* This method **must** be implemented by subclasses.
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*
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* @param value the value of the input to validate
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*/
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validate(value) {
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throw new Error("Implement this method.");
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}
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/**
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* Runs when the user submits a valid input.
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*
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* This method **must** be implemented by subclasses.
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*/
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onValidInput() {
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throw new Error("Implement this method.");
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}
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/**
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* Runs when a user submits an invalid input.
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*
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* This method **must** be implemented by subclasses.
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*/
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onInvalidInput() {
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throw new Error("Implement this method.");
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}
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/**
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* Resets the input, title, and error message to their initial state, and removes the value from the input.
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*/
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reset() {
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this.input.value = "";
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this.input.dataset["entered"] = "false";
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this.showSuccess();
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this.titleLabel.classList.remove("success-message");
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this.updateTitle();
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}
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/**
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* Marks the input as invalid and displays an error label with the given message.
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*
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* @param message the error message to display
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*/
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showError(message) {
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this.input.setCustomValidity(message || "Invalid");
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this.titleLabel.classList.remove("success-message");
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this.titleLabel.classList.add("error-message");
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this.errorLabel.classList.remove("invisible");
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this.errorLabel.innerText = message;
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}
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/**
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* Marks the input as valid and hides the error label.
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*/
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showSuccess() {
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this.input.setCustomValidity("");
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this.titleLabel.classList.remove("error-message");
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this.titleLabel.classList.add("success-message");
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this.errorLabel.classList.add("invisible");
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this.errorLabel.innerText = "";
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}
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/**
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* Updates the title label's contents.
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*
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* Does nothing by default. Implement this method to make it do something.
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*/
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updateTitle() {
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// Do nothing
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}
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/**
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* Focuses the input element.
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*/
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selectInput() {
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this.input.select();
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}
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}
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/**
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* A wrapper around the good ol' `Date` class that provides a bunch of useful Doomsday-specific methods.
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*/
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class DoomsdayDate {
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/**
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* Wraps a `DoomsdayDate` around the given `Date`.
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*
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* @param date the `Date` to be wrapped
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*/
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constructor(date) {
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this.date = date;
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}
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/**
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* Returns the number of this `DoomsdayDate`'s century.
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*/
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getCentury() {
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return Math.floor(this.date.getFullYear() / 100);
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}
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/**
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* Returns the day of the week of the anchor of this `DoomsdayDate`'s century as a string.
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*/
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getCenturyAnchorString() {
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const centuryAnchorNumber = (5 * (this.getCentury() % 4)) % 7 + 2;
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return DoomsdayDate.dayNumberToString(centuryAnchorNumber);
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};
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/**
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* Returns the day of the week of the anchor day of this `DoomsdayDate`'s year as a string.
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*/
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getYearAnchorString() {
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const anchorDate = new Date(this.date);
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anchorDate.setMonth(3); // April
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anchorDate.setDate(4); // 4th
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return DoomsdayDate.dayNumberToString(anchorDate.getDay());
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};
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/**
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* Returns the day of the week of this `DoomsdayDate` as a string.
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*/
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getWeekdayString() {
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return DoomsdayDate.dayNumberToString(this.date.getDay());
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};
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/**
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* Returns the name of the day given its 0-based index, where 0 is `Sunday`.
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*
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* @param dayNumber the number of the day, as returned by `Date`'s `#getDay` function.
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*/
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static dayNumberToString(dayNumber) {
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switch (dayNumber % 7) {
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case 0:
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return "Sunday";
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case 1:
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return "Monday";
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case 2:
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return "Tuesday";
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case 3:
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return "Wednesday";
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case 4:
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return "Thursday";
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case 5:
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return "Friday";
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case 6:
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return "Saturday";
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}
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};
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/**
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* Returns the day of the week corresponding to the given string.
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*
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* This is a convenience method for interpreting (incomplete) user inputs.
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*
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* @param dayString the day of the week to expand
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*/
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static expandDayString(dayString) {
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dayString = dayString.toLowerCase();
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if (dayString.startsWith("m"))
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return "Monday";
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else if (dayString.startsWith("tu"))
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return "Tuesday";
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else if (dayString.startsWith("w"))
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return "Wednesday";
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else if (dayString.startsWith("th"))
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return "Thursday";
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else if (dayString.startsWith("f"))
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return "Friday";
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else if (dayString.startsWith("sa"))
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return "Saturday";
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else if (dayString.startsWith("su"))
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return "Sunday";
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else
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return undefined;
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}
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2020-01-25 16:31:59 +01:00
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|
/**
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* Returns a random date in the range `0001-01-01` (inclusive) to `9999-12-31` (inclusive), wrapped inside a
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|
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* `DoomsdayDate` object.
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|
|
*/
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|
static random() {
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// TODO Give custom dates to this method
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const minDate = new Date("0001-01-01").getTime() / 86400000;
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const maxDate = new Date("9999-12-31").getTime() / 86400000;
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return new DoomsdayDate(new Date(generateRandom(minDate, maxDate) * 86400000));
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}
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}
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|
doAfterLoad(() => {
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|
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let quizDate;
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2020-01-25 17:01:32 +01:00
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|
|
const centuryInput = new class extends ValidatableInput {
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2020-01-25 16:31:59 +01:00
|
|
|
validate(value) {
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2020-01-25 17:18:50 +01:00
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|
return compareWeekdays(quizDate.getCenturyAnchorString(), value);
|
2020-01-25 15:27:31 +01:00
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|
}
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|
2020-01-25 16:31:59 +01:00
|
|
|
onValidInput() {
|
2020-01-25 17:18:50 +01:00
|
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|
this.input.value = DoomsdayDate.expandDayString(this.input.value);
|
2020-01-25 17:01:32 +01:00
|
|
|
yearInput.selectInput();
|
2020-01-25 16:31:59 +01:00
|
|
|
}
|
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|
|
onInvalidInput() {
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|
|
// Do nothing
|
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|
|
}
|
2020-01-25 17:01:32 +01:00
|
|
|
|
|
|
|
updateTitle() {
|
2020-01-25 17:18:50 +01:00
|
|
|
this.titleLabel.innerText = `Anchor day of century starting in ${quizDate.getCentury() * 100}?`;
|
2020-01-25 17:01:32 +01:00
|
|
|
}
|
|
|
|
}($("#century-input"), $("#century-title-label"), $("#century-error-label"));
|
|
|
|
const yearInput = new class extends ValidatableInput {
|
2020-01-25 16:31:59 +01:00
|
|
|
validate(value) {
|
2020-01-25 17:18:50 +01:00
|
|
|
return compareWeekdays(quizDate.getYearAnchorString(), value);
|
2020-01-25 16:31:59 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
onValidInput() {
|
2020-01-25 17:18:50 +01:00
|
|
|
this.input.value = DoomsdayDate.expandDayString(this.input.value);
|
2020-01-25 17:01:32 +01:00
|
|
|
dayInput.selectInput();
|
2020-01-25 16:31:59 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
onInvalidInput() {
|
|
|
|
// Do nothing
|
|
|
|
}
|
2020-01-25 17:01:32 +01:00
|
|
|
|
|
|
|
updateTitle() {
|
|
|
|
this.titleLabel.innerText = `Doomsday of year ${quizDate.date.getFullYear()}?`;
|
|
|
|
}
|
|
|
|
}($("#year-input"), $("#year-title-label"), $("#year-error-label"));
|
|
|
|
const dayInput = new class extends ValidatableInput {
|
2020-01-25 16:31:59 +01:00
|
|
|
validate(value) {
|
2020-01-25 17:18:50 +01:00
|
|
|
return compareWeekdays(quizDate.getWeekdayString(), value);
|
2020-01-25 15:27:31 +01:00
|
|
|
}
|
2020-01-25 16:31:59 +01:00
|
|
|
|
|
|
|
onValidInput() {
|
2020-01-25 17:18:50 +01:00
|
|
|
this.input.value = DoomsdayDate.expandDayString(this.input.value);
|
2020-01-25 16:31:59 +01:00
|
|
|
reloadQuiz();
|
|
|
|
}
|
|
|
|
|
|
|
|
onInvalidInput() {
|
|
|
|
// Do nothing
|
|
|
|
}
|
2020-01-25 17:01:32 +01:00
|
|
|
|
|
|
|
updateTitle() {
|
|
|
|
this.titleLabel.innerText = `Weekday of ${quizDate.date.toISOString().substr(0, 10)}?`;
|
|
|
|
}
|
|
|
|
}($("#day-input"), $("#day-title-label"), $("#day-error-label"));
|
2020-01-25 16:31:59 +01:00
|
|
|
|
|
|
|
|
2020-01-25 17:01:32 +01:00
|
|
|
/**
|
|
|
|
* Generates a new date for the quiz and resets the inputs to reflect this.
|
|
|
|
*/
|
2020-01-25 16:31:59 +01:00
|
|
|
function reloadQuiz() {
|
|
|
|
quizDate = DoomsdayDate.random();
|
2020-01-25 17:01:32 +01:00
|
|
|
centuryInput.reset();
|
|
|
|
yearInput.reset();
|
|
|
|
dayInput.reset();
|
|
|
|
centuryInput.selectInput();
|
2020-01-25 16:31:59 +01:00
|
|
|
}
|
|
|
|
|
2020-01-25 17:01:32 +01:00
|
|
|
// Let the fun begin
|
2020-01-25 16:31:59 +01:00
|
|
|
reloadQuiz();
|
2020-01-25 15:27:31 +01:00
|
|
|
});
|
|
|
|
</script>
|
|
|
|
</body>
|
|
|
|
</html>
|