MediaWiki:Love.js

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// Some helpers for localStorage, basically resort to doing nothing
// if it isn't available.
function storeValue(name, value) {
	try {
		localStorage[name] = value;
	}
	catch (e) {
	}
}

function retrieveValue(name) {
	try {
		return localStorage[name];
	}
	catch (e) {
		return undefined;
	}
}

// Original from https://gist.github.com/airstruck/1603d55d79c469ac9fa6
function versionpicker() {
	// Test it on https://love2d.org/wiki/love.thread.newThread
	// TODO: dl notes: https://love2d.org/wiki/GraphicsFeature
	// TODO: box notes: https://love2d.org/wiki/love.event.push

	var picker = document.createElement('select')

	picker.onchange = function () {
		applyFilter(this.options[this.selectedIndex].value)
	}

	function array (a) {
		return [].slice.apply(a || [])
	}

	var pickerVersions = {}

	function injectPickerOption (version, text) {
		if (pickerVersions[version]) {
			return
		}
		pickerVersions[version] = true
		
		var option = document.createElement('option')
		
		option.value = version
		option.textContent = text
		picker.appendChild(option)
	}

	function makeWrapper () {
		var wrapper = document.createElement('div')
		
		wrapper.setAttribute('data-love-filterable', true)
		
		return wrapper
	}

	function wrapSections () {
		var element = document.querySelector('h2')
		var wrapper
		
		while (element) {
			var next = element.nextSibling
			if (element.nodeName == 'H2') {
				wrapper = makeWrapper()
				element.parentNode.insertBefore(wrapper, element)
			}
			wrapper.appendChild(element)
			element = next
		}
	}

	function updateSectionFromNote (section, note) {
		if (note.textContent.match(/available since/i)) {
			var a = note.querySelector('a')
			section.setAttribute('data-love-version-added', a.title)
			note.setAttribute('data-love-version-note', true)
		}
		if (note.textContent.match(/removed in/i)) {
			var a = note.querySelector('a')
			section.setAttribute('data-love-version-removed', a.title)
			note.setAttribute('data-love-version-note', true)
		}
	}

	function QueryIterator (query) {
		return function (callback) {
			return array(document.querySelectorAll(query)).forEach(callback)
		}
	}

	var withSections = QueryIterator('*[data-love-filterable]')
	var withAdded = QueryIterator('*[data-love-version-added]')
	var withRemoved = QueryIterator('*[data-love-version-removed]')
	var withNotes = QueryIterator('*[data-love-version-note]')

	function hideNotes () {
		withNotes(function (note) { note.style.display = 'none' })
	}

	function showNotes () {
		withNotes(function (note) { note.style.display = null })
	}

	var needsFilter = false

	function scanSections () {
		withSections(function (section) {
			var note = section.querySelector('table')
			if (!note) {
				return
			}
			updateSectionFromNote(section, note)
			while (note.nextSibling && note.nextSibling.tagName == 'TABLE') {
				note = note.nextSibling
				updateSectionFromNote(section, note)
			}
			needsFilter = true
		})
	}

	function scanTables () {
		var added = document.querySelectorAll('.smwtable *[alt="Added since"] + *')
		var removed = document.querySelectorAll('.smwtable *[alt="Removed in"] + *')
		
		array(added).forEach(function (a) {
			var e = a.parentNode.parentNode
			e.setAttribute('data-love-filterable', true)
			e.setAttribute('data-love-version-added', a.title)
			needsFilter = true
		})
		array(removed).forEach(function (a) {
			var e = a.parentNode.parentNode
			e.setAttribute('data-love-filterable', true)
			e.setAttribute('data-love-version-removed', a.title)
			needsFilter = true
		})
	}

	// return true if 'installed' is greater than or equal to 'required'
	// http://stackoverflow.com/a/6832670
	function compareVersions (installed, required) {
		var a = installed.split('.');
		var b = required.split('.');

		for (var i = 0; i < a.length; ++i) {
			a[i] = Number(a[i]);
		}
		for (var i = 0; i < b.length; ++i) {
			b[i] = Number(b[i]);
		}
		if (a.length == 2) {
			a[2] = 0;
		}

		if (a[0] > b[0]) return true;
		if (a[0] < b[0]) return false;

		if (a[1] > b[1]) return true;
		if (a[1] < b[1]) return false;

		if (a[2] > b[2]) return true;
		if (a[2] < b[2]) return false;

		return true;
	}

	function filterVersion (installed) {
		filterAll(hideNotes)
		withAdded(function (section) {
			var required = section.getAttribute('data-love-version-added')
			if (!compareVersions(installed, required)) {
				section.style.display = 'none'
			}
		})
		withRemoved(function (section) {
			var removed = section.getAttribute('data-love-version-removed')
			if (compareVersions (installed, removed)) {
				section.style.display = 'none'
			}
		})
	}

	function filterAll (hideOrShowNotes) {
		hideOrShowNotes()
		withSections(function (section) { section.style.display = null })
	}

	function filterLatest () {
		filterAll(hideNotes)
		withRemoved(function (section) { section.style.display = 'none' })
	}

	function applyFilter (value) {
		storeValue('versionpicker-version', value);
		if (value == 'all') {
			filterAll(showNotes)
			return
		}
		if (value == 'latest') {
			filterLatest()
			return
		}
		filterVersion(value)
	}

	function injectFilterPicker () {
		var target = document.getElementById('ca-nstab-main').parentNode
		
		picker.style.position = 'absolute'
		picker.style.right = 0
		picker.style.height = target.parentNode.offsetHeight - 8 + 'px'
		picker.style.margin = '4px'
		
		target.parentNode.insertBefore(picker, target)
	}

	function injectVersionTag (number, name) {
		injectPickerOption(number, 'Version ' + number + ': ' + name)
	}

	function injectVersionTags () {
		var versions = {
			"0.10.1": "Super Toast",
			"0.10.0": "Super Toast",
			"0.9.2": "Baby Inspector",
			"0.9.1": "Baby Inspector",
			"0.9.0": "Baby Inspector",
			"0.8.0": "Rubber Piggy",
			"0.7.2": "Game Slave",
			"0.7.1": "Game Slave",
			"0.7.0": "Game Slave",
			"0.6.2": "Jiggly Juice",
			"0.6.1": "Jiggly Juice",
			"0.6.0": "Jiggly Juice",
			"0.5.0": "Salted Nuts",
			"0.4.0": "Taco Beam",
			"0.3.2": "Lemony Fresh",
			"0.3.1": "Space Meat",
			"0.3.0": "Mutant Vermin",
			"0.2.1": "Impending Doom",
			"0.2.0": "Mini Moose",
			"0.1.1": "Santa Power"
		}

		for (var version in versions) {
			injectVersionTag(version, versions[version]);
		}
	}

	function queryVersionTags () {
		var url = '/w/index.php?title=Version_History&action=raw';
		var xhr = new XMLHttpRequest()
		xhr.onload = function () {
			var re = /\[\[([\d.]+)\]\][^\n]*\n[^\|]*\|(.*)\n/gm
			var m
			
			while (m = re.exec(this.responseText)) {
				injectVersionTag(m[1], m[2])
			}
		}
		xhr.open('get', url, true)
		xhr.send()
	}

	function setPicker (target) {
		for (var i = 0; i < picker.options.length; ++i) {
			if (picker.options[i].value === target) {
				picker.selectedIndex = i;
				picker.onchange();
				break;
			}
		}
	}

	function main () {
		wrapSections()
		scanSections()
		scanTables()
		injectPickerOption('all', 'All Versions')
		injectPickerOption('latest', 'Latest Version')
		injectVersionTags()
		injectFilterPicker()
		var target = retrieveValue('versionpicker-version')
		if (target !== undefined) {
			setPicker(target)
		}
	}

	main()
}