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index.html
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<html>
<head>
<style>
body {
margin: 1em;
}
hr {
border: 0;
border-top: 1px solid #ccc;
margin: 2em 0;
padding: 0;
}
select {
background-color: transparent;
border: 0px;
margin-right: 2em;
outline: none;
}
input[type="button"] {
font-size: 16px;
background-color: #fafafa;
border: 1px solid #ccc;
border-radius: 3px;
height: 34px;
}
.input, .output {
margin: 0.3em 0;
}
.text {
border: 0px;
border-bottom: 3px solid #aaa;
width: 80%;
height: 50px;
font-size: 40px;
}
.text:focus {
outline: none;
border-bottom: 3px solid #aaf;
}
.text.modified {
background-color: lightyellow;
}
.text.error {
background-color: pink;
}
.encoded-focused {
color: red;
}
.char {
display: inline-block;
width: 70px;
height: 100px;
vertical-align: top;
margin: 1px;
margin-top: 10px;
padding: 3px;
padding-top: 10px;
position: relative;
box-shadow: 1px 1px 1px lightgrey;
background-color: white;
}
.char input {
outline: none;
border: 0px;
border-bottom: 1px solid #aaa;
font-size: 16px;
width: 100%;
}
.char .delete {
display: none;
position: absolute;
right: -2px;
top: -2px;
cursor: pointer;
width: 20px;
height: 20px;
}
.char:hover .delete {
display: block;
}
.plus {
display: inline-block;
color: #666;
font-size: 46px;
width: 50px;
height: 80px;
vertical-align: middle;
margin: 0px;
padding: 20px;
padding-top: 30px;
}
.utf8 {
font-size: 10px;
}
.utf16 {
font-size: 10px;
}
.link {
font-size: 10px;
}
session-view {
display: block;
position: relative;
width: 100%;
}
.delete-session {
display: none;
position: absolute;
top: 0;
right: 0;
background-color: transparent;
width: 3em;
height: 3em;
outline: none;
cursor: pointer;
border: 2px solid;
border-color: transparent;
border-radius: 50%;
}
session-view:hover .delete-session {
display: block;
}
.xmark::before,
.xmark::after {
display: block;
content: "";
position: absolute;
top: 50%;
left: 50%;
width: 70%;
height: 14%;
margin: -7% 0 0 -35%; /* -h/2 0 0 -w/2 */
background: #666;
}
.xmark::before {
transform: rotate(-45deg);
}
.xmark::after {
transform: rotate(45deg);
}
.triple-click-separator {
margin: 0.2em;
padding: 0;
border: 0 transparent;
}
</style>
</head>
<body>
<div id="main"></div>
<input type="button" id="add" value="Add"></input>
<script>
function getHex(number, size=4) {
let hex = number.toString(16).toUpperCase();
if (hex.length >= size) {
return hex;
}
return ("0000" + hex).substr(hex.length, size);
}
class Encoder {
static getEncodings() {
return ["text", "utf32-amp", "utf32-u", "utf16-u", "utf8-x", "utf8-pct"];
}
static getDefaultEncoding() {
return "utf32-amp";
}
static getLabel(encoding, fallback="") {
const dict = {
"text": "text",
"utf32-amp": "UTF32 &#xNNNN;",
"utf32-u": "UTF32 \\u{NNNN}",
"utf16-u": "UTF16 \\uNNNN",
"utf8-x": "UTF8 \\xNN",
"utf8-pct": "UTF8 %NN",
};
return dict[encoding] || fallback;
}
static decode(value, encoding) {
let decoded = "";
switch(encoding) {
case "text":
decoded = value;
break;
case "utf32-amp":
let parser = new DOMParser();
const dom = parser.parseFromString(value, 'text/html');
decoded = dom.body.textContent;
break;
case "utf32-u":
decoded = value.replace(/\\\\/g, "\\u{5C}");
decoded = decoded.replace(/\\u\{([a-fA-F0-9]+)\}/g, (m, m1) => {
return String.fromCodePoint(parseInt(m1, 16));
});
break;
case "utf16-u":
decoded = value.replace(/\\\\/g, "\\u5C");
decoded = decoded.replace(/\\u([a-fA-F0-9]+)/g, (m, m1) => {
return String.fromCharCode(parseInt(m1, 16));
});
break;
case "utf8-x":
decoded = value.replace(/%/g, "%25").replace(/\\\\/g, "%5C");
decoded = decodeURIComponent(decoded.replace(/\\x/g, "%"));
break;
case "utf8-pct":
decoded = decodeURIComponent(value);
break;
default:
decoded = "invalid encoding";
}
return decoded;
}
static encode(value, encoding) {
let encoded = "";
switch(encoding) {
case "text":
encoded = value;
break;
case "utf32-amp":
encoded = this.encodeUtf32(value, "&#x", ";");
break;
case "utf32-u":
encoded = this.encodeUtf32(value, "\\u{", "}");
break;
case "utf16-u":
encoded = this.encodeUtf16(value, "\\u", "");
break;
case "utf8-x":
encoded = this.encodeUtf8(value, "\\x", "");
break;
case "utf8-pct":
encoded = this.encodeUtf8(value, "%", "");
break;
default:
encoded = "invalid encoding";
}
return encoded;
}
static getUtf8Array(str) {
let utf8s = [];
const utf8encoded = encodeURIComponent(str);
for (let i = 0; i < utf8encoded.length; ++i) {
if (utf8encoded[i] != "%") {
utf8s.push(utf8encoded[i].charCodeAt(0));
} else {
utf8s.push(parseInt(utf8encoded.slice(i + 1, i + 3), 16));
i += 2;
}
}
return utf8s;
}
static getUtf16Array(str) {
let utf16s = [];
for (let i = 0; i < str.length; ++i) {
utf16s.push(str.charCodeAt(i));
}
return utf16s;
}
static getUtf32Array(str) {
let utf32s = [];
for (let i = 0; i < str.length; ++i) {
const codePoint = str.codePointAt(i);
const charCode = str.charCodeAt(i);
// If codePoint is more than 0xFFFF, charCode is a part of surrogate pair.
if (codePoint !== charCode) {
i++;
}
utf32s.push(codePoint);
}
return utf32s;
}
static encodeUtf(str, getUtfArrayFunc, size, prefix="", suffix="", delimiter="") {
const utfs = getUtfArrayFunc(str);
const encoded = utfs.map(x => { return prefix + getHex(x, size) + suffix; });
return encoded.join(delimiter);
}
static encodeUtf8(str, prefix="", suffix="", delimiter="") {
return this.encodeUtf(str, this.getUtf8Array, 2, prefix, suffix, delimiter);
}
static encodeUtf16(str, prefix="", suffix="", delimiter="") {
return this.encodeUtf(str, this.getUtf16Array, 4, prefix, suffix, delimiter);
}
static encodeUtf32(str, prefix="", suffix="", delimiter="") {
return this.encodeUtf(str, this.getUtf32Array, 4, prefix, suffix, delimiter);
}
}
class Session {
constructor(value, encoding) {
this.prevValue = value;
this.chars = Session.parse(value);
this.prevEncoding = encoding;
this.encoding = encoding;
this.onUpdateCallback = null;
}
setOnUpdateCallback(func) {
this.onUpdateCallback = func;
}
onUpdate() {
const value = this.getValue();
if (value != this.prevValue || this.encoding != this.prevEncoding) {
this.prevValue = value;
this.prevEncoding = this.encoding;
if (this.onUpdateCallback) {
this.onUpdateCallback();
}
}
}
setValue(value) {
this.chars = Session.parse(value);
this.onUpdate();
}
getValue() {
return this.chars.join("");
}
getSubValue(start, end) {
return this.chars.slice(start, end).join("");
}
setEncoding(encoding) {
this.encoding = encoding;
this.onUpdate();
}
getEncoding() {
return this.encoding;
}
getLength() {
return this.chars.length;
}
getCharAt(i) {
return this.chars[i];
}
getCodePointAt(i) {
return this.chars[i].codePointAt(0);
}
static parse(value) {
return Encoder.getUtf32Array(value).map(x => String.fromCodePoint(x));
}
replace(index, char) {
this.chars.splice(index, 1, char);
this.setValue(this.getValue());
this.onUpdate();
}
insert(index, char) {
this.chars.splice(index, 0, char);
this.onUpdate();
}
delete(index) {
this.chars.splice(index, 1);
this.onUpdate();
}
}
class SessionArray {
constructor() {
this.sessionArray = [];
}
clear() {
this.sessionArray = [];
}
addSession(value, encoding) {
const session = new Session(value, encoding);
this.sessionArray.push(session);
return session;
}
removeSession(session) {
this.sessionArray.splice(this.sessionArray.indexOf(session), 1);
}
getSessions() {
return this.sessionArray;
}
}
class SessionManager {
constructor() {
this.sessionArray = new SessionArray();
this.sessionViewMap = new Map(); // Key: session
this.dragData = {};
let addButton = document.getElementById("add");
addButton.addEventListener("click", (event) => {
this.addSession(this.getLastSessionValue(), Encoder.getDefaultEncoding());
});
}
getLastSessionValue() {
const sessions = this.sessionArray.getSessions();
const length = sessions.length;
if (length == 0) {
return "";
}
return sessions[length - 1].getValue();
}
addSession(value, encoding) {
let session = this.sessionArray.addSession(value, encoding);
let view = document.createElement("session-view");
view.setSession(session);
session.setOnUpdateCallback(() => { this.onSessionUpdate(session); });
this.sessionViewMap.set(session, view);
view.addEventListener("delete-session", (event) => {
this.removeSession(event.detail.session);
});
view.addEventListener("char-drag", (event) => {
this.dragData = { session: event.detail.session, index: event.detail.index };
});
view.addEventListener("char-drop", (event) => {
const dropData = { session: event.detail.session, index: event.detail.index };
this.moveChar(this.dragData, dropData);
});
document.getElementById("main").appendChild(view);
this.updateUrlParams();
return view;
}
onSessionUpdate(session) {
this.sessionViewMap.get(session).draw();
this.updateUrlParams();
}
removeSession(session) {
this.sessionArray.removeSession(session);
const removedView = this.sessionViewMap.get(session);
this.sessionViewMap.delete(session);
document.getElementById("main").removeChild(removedView);
this.updateUrlParams();
}
updateUrlParams() {
const params = this.getUrlParams();
history.replaceState("", "", location.pathname + "?" + params);
}
getUrlParams() {
let i = 0;
let params = [];
for (let session of this.sessionArray.getSessions()) {
const text = encodeURIComponent(session.getValue());
const encoding = encodeURIComponent(session.encoding);
params.push(`t${i}=${text}&e${i}=${encoding}`);
i++;
}
params.unshift(`s=${i}`);
return params.join("&");
}
loadUrlParams(urlParams) {
this.sessionArray.clear();
this.sessionViewMap.clear();
const params = new URLSearchParams(urlParams);
const size = params.get("s") || 0;
if (size == 0) {
this.addSession("(๑•̀ㅂ•́)و✧", Encoder.getDefaultEncoding());
return;
}
for (let i = 0; i < size; ++i) {
const text = params.get(`t${i}`);
const encoding = params.get(`e${i}`);
if (text && encoding) {
this.addSession(text, encoding);
}
}
}
moveChar(dragData, dropData) {
let char = " ";
if (dragData.index < dragData.session.getLength()) {
char = dragData.session.getCharAt(dragData.index);
dragData.session.delete(dragData.index);
}
dropData.session.insert(dropData.index, char);
}
}
customElements.define("encoding-select", class extends HTMLElement {
constructor() {
super();
let root = this;
// let root = this.attachShadow({mode: 'open'});
let optionsHtml = "<select class='encode'>";
for (let encoding of Encoder.getEncodings()) {
optionsHtml += `<option value="${encoding}">${Encoder.getLabel(encoding)}</option>`;
}
optionsHtml += "</select>";
root.innerHTML = optionsHtml + root.innerHTML;
}
selectElement() {
return this.getElementsByTagName("select")[0];
}
});
customElements.define("session-view", class extends HTMLElement {
constructor() {
super();
this.focused = null;
this.isDropped = false; // true on drop event until the next mouseenter event.
this.prevValue = null;
}
setSession(session) {
this.session = session;
this.innerHTML = (
`<button class="delete-session xmark" title="Delete this session."></button>`+
`<div class="input">` +
`<encoding-select></encoding-select>` +
`<input type="text" class="text"></input><br/>` +
`</div>` +
`<div class="output">` +
`<encoding-select></encoding-select>` +
`<span class="encoded-left"></span>` +
`<span class="encoded-focused"></span>` +
`<span class="encoded-right"></span>` +
`<hr class="triple-click-separator" />` +
`</div>` +
`<div class="chars"></div>` +
`<hr />`);
let deleteSession = this.getElementsByClassName("delete-session")[0];
deleteSession.addEventListener("click", (e) => {
const event = new CustomEvent("delete-session", { detail: {session: session }});
this.dispatchEvent(event);
});
this.chars = this.getElementsByClassName("chars")[0];
let encodingSelectElements = this.getElementsByTagName("encoding-select");
this.inputSelect = encodingSelectElements[0].selectElement();
// inputSelect.value = "text";
this.inputSelect.addEventListener("change", (event) => {
const value = this.session.getValue();
this.setInputValue(value);
});
// Text field
this.textField = this.getElementsByClassName("text")[0];
this.textField.addEventListener("input", (event) => {
const willUpdateSession = (this.inputSelect.value == "text");
this.updateTextField(willUpdateSession);
});
this.textField.addEventListener("keydown", (event) => {
if (event.keyCode != 13) { // 13 == Enter key.
return;
}
const willUpdateSession = true;
this.updateTextField(willUpdateSession);
});
let selector = this.getElementsByTagName("encoding-select")[1].selectElement();
selector.value = session.getEncoding();
selector.addEventListener("change", (event) => {
this.session.setEncoding(event.target.value);
});
this.draw();
}
updateTextField(willUpdateSession) {
const encoding = this.inputSelect.value;
let decoded = "";
let error = false;
try {
decoded = Encoder.decode(this.textField.value, encoding);
} catch (e) {
error = true;
}
if (!error && willUpdateSession) {
this.session.setValue(decoded);
}
const modified = !error && (this.session.getValue() != decoded);
this.textField.classList.toggle("modified", modified);
this.textField.classList.toggle("error", error);
}
draw() {
const value = this.session.getValue();
this.setInputValue(value);
if (this.prevValue != value) {
this.chars.innerHTML = "";
for (let i = 0; i < this.session.getLength(); ++i) {
this.chars.appendChild(this.createCharElement(i));
}
this.chars.appendChild(this.createPlusElement(value.length));
this.prevValue = value;
}
const encoding = this.session.getEncoding();
let encoded = [];
if (this.focused == null) {
encoded.push(Encoder.encode(value, encoding), "", "");
} else {
const textLeft = this.session.getSubValue(0, this.focused);
const textFocused = this.session.getSubValue(this.focused, this.focused + 1);
const textRight = this.session.getSubValue(this.focused + 1, this.session.getLength());
encoded.push(Encoder.encode(textLeft, encoding));
encoded.push(Encoder.encode(textFocused, encoding));
encoded.push(Encoder.encode(textRight, encoding));
}
this.getElementsByClassName("encoded-left")[0].innerText = encoded[0];
this.getElementsByClassName("encoded-focused")[0].innerText = encoded[1];
this.getElementsByClassName("encoded-right")[0].innerText = encoded[2];
}
setInputValue(value) {
const encoding = this.inputSelect.value;
this.textField.value = Encoder.encode(value, encoding);
}
maybeEscapeChar(char) {
const escape = {
"\u{0009}": "<TAB>",
"\u{0020}": "<SP>",
"\u{200D}": "<ZWJ>",
"\u{202C}": "<PDF>",
"\u{202D}": "<LRO>",
"\u{202E}": "<RLO>",
};
return escape[char] || char;
}
createCharElement(index) {
let charElement = document.createElement("div");
charElement.className = "char";
const codePoint = this.session.getCodePointAt(index);
const utf8String = Encoder.encodeUtf8(this.session.getCharAt(index), "", "", " ");
const utf16String = Encoder.encodeUtf16(this.session.getCharAt(index), "", "", " ");
const codePointHex = getHex(codePoint);
const codePointChar = this.maybeEscapeChar(this.session.getCharAt(index));
const url = `http://unicode.org/cldr/utility/character.jsp?a=${codePointHex}`;
charElement.innerHTML = (
`<div class="delete xmark"></div>` +
`<div><input class="codePointHex" type="text"/></div>` +
`<div><input class="codePointChar" type="text"/></div>` +
`<div class="utf8">${utf8String}</div>` +
`<div class="utf16">${utf16String}</div>` +
`<div class="link"><a href="${url}">properties</a></div>`);
let codePointHexElement = charElement.getElementsByClassName("codePointHex")[0];
codePointHexElement.value = codePointHex;
codePointHexElement.addEventListener("change", () => {
this.session.replace(index, String.fromCodePoint(parseInt(codePointHexElement.value, 16)));
});
let codePointCharElement = charElement.getElementsByClassName("codePointChar")[0];
codePointCharElement.value = codePointChar;
codePointCharElement.addEventListener("change", () => {
this.session.replace(index, codePointCharElement.value);
});
let deleteElement = charElement.getElementsByClassName("delete")[0];
deleteElement.addEventListener("click", () => {
this.session.delete(index);
})
// Drag and Drop
this.enableDragAndDrop(charElement, index);
charElement.addEventListener("dragstart", (event) => {
// Hacky way to hide the original element.
setTimeout(() => {
charElement.style.visibility = "hidden";
}, 1);
deleteElement.style.display = "none";
});
charElement.addEventListener("dragend", (event) => {
setTimeout(() => {
charElement.style.visibility = null;
}, 1);
deleteElement.style.display = null;
});
charElement.addEventListener("dragover", (event) => {
charElement.style.backgroundColor = "lightgrey";
});
charElement.addEventListener("dragleave", (event) => {
charElement.style.backgroundColor = "white";
});
// Focus
charElement.addEventListener("mouseenter", () => {
if (this.isDropped) {
// Skip handling this event just after drop event.
// This event comes from the element located in the dragging point,
// but not the dropped point. This behavior would be a bug in somewhere.
this.isDropped = false;
return;
}
if (this.focused == index) {
return;
}
clearTimeout(this.delayedUnfocus);
this.focused = index;
this.draw();
});
charElement.addEventListener("mouseleave", () => {
if (this.focused == null) {
return;
}
this.delayedUnfocus = setTimeout(() => {
this.focused = null;
this.draw();
}, 100);
});
return charElement;
}
createPlusElement(index) {
let plus = document.createElement("div");
plus.className = "plus";
plus.innerText = "⊕";
plus.addEventListener("click", () => {
this.session.insert(index, " ");
});
this.enableDragAndDrop(plus, index);
return plus;
}
enableDragAndDrop(element, index) {
element.draggable = true;
element.addEventListener("dragstart", (event) => {
const dragEvent = new CustomEvent("char-drag", { detail: { event: event, session: this.session, index: index }});
this.dispatchEvent(dragEvent);
});
element.addEventListener("dragover", (event) => {
event.preventDefault();
});
element.addEventListener("drop", (event) => {
event.preventDefault();
this.isDropped = true;
this.focused = index;
const dropEvent = new CustomEvent("char-drop", { detail: { event: event, session: this.session, index: index }});
this.dispatchEvent(dropEvent);
});
}
});
const params = new URLSearchParams(window.location.search);
let sessionManager = new SessionManager();
sessionManager.loadUrlParams(params);
</script>
</body>
</html>