calculator/index.html at master · EpicenterPrograms/calculator · GitHub

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<!doctype html>
<html>
	<head>
		<link rel="icon" href="favicon.ico">
		<title>
			Calculator
		</title>
		<script src="https://epicenterprograms.github.io/standards/behavior/general.js"></script>
		<script>
			var S = Standards.general;
			var intervals = {};
			var keys = {};
			var position = {left:0, top:0};
			var previousEvaluation = "";  // the previous mathematical expression calculated (prevents spamming Entity creation)
			var previousAnswer = "";  // the result of the current/previous calculation


			window.addEventListener("load", function() {  // This is what runs when the page loads; equivalent to <body onload=aFunction()>
				intervals.checker = setInterval(keyResponse, 10);
			});

			document.addEventListener("keydown", function(event) {  // This is when a key is pressed down. This is continually called.
				if (document.activeElement != document.getElementById("expression")) {  // allows navigating the expression input (and do it without moving stuff)
					if ([37, 38, 39, 40].some(function (code) { return event.keyCode == code; })) {  // if an arrow key was pressed
						event.preventDefault();
					}
					keys[String(event.keyCode)] = true;
				} else if (event.keyCode == 13) {  // if the "Enter" key is pressed
					event.preventDefault();
					solve();
				}
			});

			document.addEventListener("keyup", function(event) {  // This is when a key is let up.
				keys[String(event.keyCode)] = false;
			});

			function keyResponse() {
				S.forEach(keys, function (trueFalse, key) {
					if (trueFalse == true) {
						switch (Number(key)) {
							case 37:  // left arrow key is pressed
								position.left--;
								break;
							case 38:  // up arrow key is pressed
								position.top--;
								break;
							case 39:  // right arrow key is pressed
								position.left++;
								break;
							case 40:  // down arrow key is pressed
								position.top++;
								break;
						}
					}
				});
				document.getElementById("dot").style.left = position.left / 10.0 + "em";
				document.getElementById("dot").style.top = position.top / 10.0 + "em";
			}

			document.addEventListener("mouseup", function(){
				document.getElementById("inputOutput").style.background = hexSet([255*Math.round(Math.random()), 255*Math.round(Math.random()), 255*Math.round(Math.random())], 2, '#');
			});

			var Entity = function (specs) {
				specs = specs || {};
				this.appearance = {"background-color": String(hexSet([255*Math.round(Math.random()), 255*Math.round(Math.random()), 255*Math.round(Math.random())], 2, '#'))};
				this.position = {"top": String((document.body.clientHeight-40)*Math.random()) + "px"};
				S.forEach(specs, function(value, specification) {
					switch(specification) {
						case "appearance":
							S.forEach(value, function(feature, key) {
								this.appearance[key] = feature;
							});
							break;
						case "position":
							S.forEach(value, function(place, key) {
								this.position[key] = place;
							});
							break;
					}
				});
				let div = document.createElement("div");
				div.className = "phrase-bullet";
				document.body.appendChild(div);  // Actually makes the div appear.
				S.forEach(this.appearance, function (style, attribute) {
					div.style[attribute] = style;
				});
				S.forEach(this.position, function (style, attribute) {
					div.style[attribute] = style;
				});
				let messages = ["Wahoo!", "Yipee!", "Numbers rule!", "Show math who's boss!", "You + Calculator =<br>AWESOMENESS!", "3 + 3 = 3!"];
				div.innerHTML = messages[Math.floor(Math.random()*messages.length)];
				setTimeout(function() {
					div.style.left = "-25em";  // This doesn't happen immediately because of the transition.
				}, 0);
				setTimeout(function() {
					document.body.removeChild(div);
				}, 5000);  // This is the duration of the transition.
				div.addEventListener("click", function () {
					let score = Math.round(25 / this.textContent.length);
					if (score == 0) {
						score = 1;
					}
					if (document.getElementById("scoreBox").offsetParent === null) {  // checks whether #scoreBox is displayed
						document.getElementById("scoreBox").style.display = "inline-block";
						document.getElementById("score").innerHTML = "Score: " + score;
					} else {
						let text = document.getElementById("score").innerHTML;
						document.getElementById("score").innerHTML = "Score: " + (Number(text.split(" ")[1]) + score);
					}
				});
			}


			function solve() {
				let expression = document.getElementById("expression").value.trim().toLowerCase();
				// gets rid of anything that isn't math
				expression = expression.replace(/(?:(?:the )?answer to )?life,? the universe,? (?:and|&) everything|answer|ans|arccosine|arcsine|arctangent|cosine|sine|tangent|arccos|arcsin|arctan|acos|asin|atan|cos|sin|tan|sqrt|log|ln|pi|e|[^\d .,()+*^%/=<>-]/g, function (match) {
					switch (match) {
						case (match.match(/(?:(?:the )?answer to )?life,? the universe,? (?:and|&) everything/) ? match.match(/(?:(?:the )?answer to )?life,? the universe,? (?:and|&) everything/)[0] : ""):
						case "answer":
						case "ans":
						case "arccosine":
						case "arcsine":
						case "arctangent":
						case "cosine":
						case "sine":
						case "tangent":
						case "arccos":
						case "arcsin":
						case "arctan":
						case "acos":
						case "asin":
						case "atan":
						case "cos":
						case "sin":
						case "tan":
						case "sqrt":
						case "log":
						case "ln":
						case "pi":
						case "e":
							return match;
						default:
							return "";
					}
				});
				if (expression != document.getElementById("expression").value.trim().toLowerCase()) {
					alert("Invalid characters were used in the mathematical expression.");
				} else if (expression == "") {
					return;
				} else if (expression.search(/\(|\)/) > -1 && expression.match(/\(/g).length != expression.match(/\)/g).length) {
					alert("There's at least one parenthesis missing.");
				} else {
					expression = expression.replace(/(?:(?:the )?answer to )?life,? the universe,? (?:and|&) everything/g, "42");
                    expression = expression.replace(/answer|ans/g, previousAnswer);
					expression = expression.replace(/,/g, "");
					expression = expression.replace(/==+/g, "=");
					expression = expression.replace(/([^<>])=(?!<|>)/g, function (match) { return match + "="; });
					expression = expression.replace(/=<|==</g, "<=");
					expression = expression.replace(/=>|==>/g, ">=");
                    expression = expression.replace(/\^/g, "**");
                    expression = expression.replace(/sqrt\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, "($1)**.5");
					expression = expression.replace(/(^|[^a-z])pi(?![a-z])/g, function (match, char) { return char + "Math.PI"; });
					expression = expression.replace(/(^|[^a-z])e(?![a-z])/g, function (match, char) { return char + "Math.E"; });
					expression = expression.replace(/(^|[^a-z])(log[^()]*)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, base, log) {
						if (base == "log") {
							return char + "Math.log(" + log + ")/Math.log(10)";
						} else {
							return char + "Math.log(" + log + ")/Math.log(" + eval(base.slice(3)) + ")";
						}
					});
					expression = expression.replace(/(^|[^a-z])ln(\d+\.?\d*|\.\d+|\((?:[^()]*(?:\([^()]+\))?[^()]*)+\))/g, function (match, char, log) {
						return char + "Math.log(" + (log[0]=="(" ? log.slice(1,log.length-1) : log) + ")";
					});
					expression = expression.replace(/(^|[^a-z])(?:arccosine|arccos|acos)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, acos) {
						return char + "Math.acos(" + acos + (document.getElementById("degrees").checked ? ")*180/Math.PI" : ")");
					});
					expression = expression.replace(/(^|[^a-z])(?:arcsine|arcsin|asin)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, asin) {
						return char + "Math.asin(" + asin + (document.getElementById("degrees").checked ? ")*180/Math.PI" : ")");
					});
					expression = expression.replace(/(^|[^a-z])(?:arctangent|arctan|atan)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, atan) {
						return char + "Math.atan(" + atan + (document.getElementById("degrees").checked ? ")*180/Math.PI" : ")");
					});
					expression = expression.replace(/(^|[^a-z])(?:cosine|cos)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, cos) {
						return char + "Math.cos(" + (document.getElementById("degrees").checked ? cos+"*Math.PI/180" : cos) + ")";
					});
					expression = expression.replace(/(^|[^a-z])(?:sine|sin)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, sin) {
						return char + "Math.sin(" + (document.getElementById("degrees").checked ? sin+"*Math.PI/180" : sin) + ")";
					});
					expression = expression.replace(/(^|[^a-z])(?:tangent|tan)\(((?:[^()]*(?:\([^()]+\))?[^()]*)+)\)/g, function (match, char, tan) {
						return char + "Math.tan(" + (document.getElementById("degrees").checked ? tan+"*Math.PI/180" : tan) + ")";
					});
					console.log(expression);
					try {
                        let answer = String(eval(expression));
                        previousAnswer = answer;
						if (answer.includes("e") && answer != "true" && answer != "false") {  // if the answer is in scientific notation
							if (answer != String(Math.round(Number(answer.split("e")[0]) * 1000000) / 1000000)) {  // if the significand goes to more than 6 decimal places
								document.getElementById("box3").value = Math.round(Number(answer.split("e")[0]) * 1000000) / 1000000;
							} else {
								document.getElementById("box3").value = answer.split("e")[0];
							}
							document.getElementById("exponent").textContent = answer.split("e")[1];
							document.getElementById("tenToAPower").style.display = "inline-block";
						} else if (answer.includes(".") && answer.indexOf(".") > 10) {  // if the answer should be in scientific notation and has a decimal
							let exponent = answer.indexOf(".") - 1;
							document.getElementById("box3").value = answer.splice(exponent + 1, 1).splice(1, 0, ".");
							document.getElementById("exponent").textContent = exponent;
							document.getElementById("tenToAPower").style.display = "inline-block";
						} else if (!answer.includes(".") && answer.length > 10) {  // if the answer should be in scientific notation and doesn't have a decimal
							let exponent = answer.length - 1;
							document.getElementById("box3").value = answer.splice(1, 0, ".");
							document.getElementById("exponent").textContent = exponent;
							document.getElementById("tenToAPower").style.display = "inline-block";
						} else if ((!answer.includes(".") && answer.length > 3 || answer.includes(".") && answer.indexOf(".") > 3) && !(answer === "true" || answer === "false")) {  // if comma separators should be added
							if (answer.includes(".")) {  // if there's a decimal
								for (let index = answer.indexOf(".") - 3; index > 0; index -= 3) {
									answer = answer.slice(0, index) + "," + answer.slice(index);
                                }
                            } else {  // if there's not a decimal
                                for (let index = answer.length - 3; index > 0; index -= 3) {
                                    answer = answer.slice(0, index) + "," + answer.slice(index);
                                }
                            }
                            document.getElementById("box3").value = answer;
                            document.getElementById("tenToAPower").style.display = "none";
						} else {  // if the answer doesn't need reformatting
							document.getElementById("box3").value = answer;
							document.getElementById("tenToAPower").style.display = "none";
						}
						if (answer == "true") {
							document.getElementById("box3").style.color = "#0a0";
						} else if (answer == "false") {
							document.getElementById("box3").style.color = "red";
						} else {
							document.getElementById("box3").style.color = "black";
						}
						makeEntity();
					} catch (error) {
						console.error(error);
						alert("There was a problem interpreting your expression.");
					}
				}
			}


			function clearValue() {  // This can't be called "clear()".
				document.getElementById("expression").value = "";
				document.getElementById("box3").value = "";
				document.getElementById("tenToAPower").style.display = "none";
				keys["39"] = true;
				setTimeout(function() {
					keys["39"] = false;
					keys["40"] = true;
					setTimeout(function() {
						keys["40"] = false;
						keys["37"] = true;
						setTimeout(function() {
							keys["37"] = false;
							keys["38"] = true;
							setTimeout(function() {
								keys["38"] = false;
								keys["39"] = true;
								setTimeout(function() {
									keys["39"] = false;
									position.left = 0;
									position.top = 0;
								}, 1000);
							}, 1100);
						}, 2000);
					}, 1100);
				}, 1000);
				makeEntity();
			}

			S.listen("expression", "dblclick", function () {
				this.value = "";
            });
            S.listen("expression", "touchhold", function () {
                this.value = "";
            });

            function transfer() {
                if (previousEvaluation == S.getId("expression").value.trim()) {  // if starting to a new expression
                    S.getId("expression").value = "ans";
				} else {  // if adding to an existing expression
					S.getId("expression").value += "ans";
				}
				S.getId("expression").focus();
			}


			function makeEntity() {
				if (previousEvaluation != S.getId("expression").value.trim()) {
					new Entity();
					previousEvaluation = S.getId("expression").value.trim();
				}
			}

			function hexSet(numberList, digits, prefix) {
				var result = "";
				S.forEach(numberList, function(number) {
					number = Math.round(number);
					number = number.toString(16);
					while (number.length < digits) {
						number = "0" + number;
					}
					result += number;
				});
				return (prefix || "") + result;
			}
		</script>
		<link rel="stylesheet" href="https://epicenterprograms.github.io/standards/formatting/foundation.css">
		<style>
			body {
				min-height: auto;
				padding: 0em;
				background: linear-gradient(to bottom right, red, orange, yellow, green, blue, purple);
			}
			button {
				margin: .25em;
			}
			.morph {
				border: .05em solid #aaaaaa;
			}
			.morph input {
				padding: .15em;
			}
			.morph:hover {
				border-radius: 1em;
			}
			.phrase-bullet {
				position: absolute;
				left: 100vw;
				border-radius: 1em 0em 0em 1em;
				padding: .5em;
				color: white;
				font-size: 2em;
				text-shadow: 0em 0em .1em black, 0em 0em .1em black;
				white-space: nowrap;
				cursor: pointer;
				-webkit-transition: left 5s linear;
				-ms-transition: left 5s linear;
				transition: left 5s linear;
			}
			#title {
				color: black;
				text-decoration: none;
			}
			#title:hover {
				color: blue;
				text-decoration: underline;
			}
			#inputOutput {
				position: relative;
				border: .1em solid black;
				background: blue;
				width: 15em;
				height: 15em;
			}
			#expression {
				margin: .75em auto;
				padding: .3em;
				width: 12em;
				height: 3em;
			}
			#answer {
				position: absolute;
				left: 4.25em;
				bottom: 1em;
				margin: auto;
				background: white;
			}
			#answer input:first-child {
				width: 8em;
			}
			#tenToAPower {
				display: none;
			}
			#dot {
				position: relative;
				padding: 1rem;
				background: blue;
				border-radius: 1rem;
				margin: 0rem auto 0em;
			}
			#scoreBox {
				display: none;
				padding: 1.5em;
				background: radial-gradient(ellipse, white, transparent, transparent);
				-webkit-animation: pulse 1s ease infinite 0s alternate;
				animation: pulse 1s ease infinite 0s alternate;
			}
			#scoreHolder {
				padding-top: 3em;
				width: 8em;
				height: 8em;
			}
			@keyframes pulse {
				from {
					margin: 2em;
					padding: 1.5em;
				}
				to {
					margin: 0em;
					padding: 3.5em;
				}
			}
		</style>
	</head>
	<body>
		<h1>
			<a href="https://epicenterprograms.github.io/calculator/turnedInVersion" title="Click for awesomeness" id="title">
				Calculator
			</a>
		</h1>
		<div id="inputOutput">
			<textarea class="morph" id="expression" placeholder="Type your expression"></textarea>
			<div id="answer">
				<input type="text" id="box3" readonly placeholder="Result">
				<div id="tenToAPower">
					&times; 10<sup id="exponent">0</sup>
				</div>
			</div>
			<br>
			<div id="dot">
				<button class="morph" onclick="solve()">
					=
				</button>
				<button class="morph" onclick="transfer()">
					Ans
				</button>
				<br>
				<button class="morph" onclick="clearValue()">
					Clear
				</button>
				<br>
				<input type="radio" name="trigUnits" id="degrees" checked>
				<label for="radians">Degrees</label>
				<input type="radio" name="trigUnits" id="radians">
				<label for="radians">Radians</label>
			</div>
		</div>
		<br>
		<div id="scoreBox">
			<div id="scoreHolder">
				<span id="score"></span><br>
				<span id="highscore"></span>
			</div>
		</div>
	</body>
</html>