512 lines
16 KiB
JavaScript
512 lines
16 KiB
JavaScript
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const globalWindow = window;
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export function CodeJar(editor, highlight, opt = {}) {
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const options = {
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tab: '\t',
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indentOn: /[({\[]$/,
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moveToNewLine: /^[)}\]]/,
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spellcheck: false,
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catchTab: true,
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preserveIdent: true,
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addClosing: true,
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history: true,
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window: globalWindow,
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...opt,
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};
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const window = options.window;
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const document = window.document;
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const listeners = [];
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const history = [];
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let at = -1;
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let focus = false;
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let onUpdate = () => void 0;
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let prev; // code content prior keydown event
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editor.setAttribute('contenteditable', 'plaintext-only');
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editor.setAttribute('spellcheck', options.spellcheck ? 'true' : 'false');
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editor.style.outline = 'none';
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editor.style.overflowWrap = 'break-word';
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editor.style.overflowY = 'auto';
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editor.style.whiteSpace = 'pre-wrap';
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const doHighlight = (editor, pos) => {
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highlight(editor, pos);
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};
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let isLegacy = false; // true if plaintext-only is not supported
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if (editor.contentEditable !== 'plaintext-only')
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isLegacy = true;
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if (isLegacy)
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editor.setAttribute('contenteditable', 'true');
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const debounceHighlight = debounce(() => {
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const pos = save();
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doHighlight(editor, pos);
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restore(pos);
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}, 30);
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let recording = false;
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const shouldRecord = (event) => {
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return !isUndo(event) && !isRedo(event)
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&& event.key !== 'Meta'
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&& event.key !== 'Control'
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&& event.key !== 'Alt'
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&& !event.key.startsWith('Arrow');
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};
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const debounceRecordHistory = debounce((event) => {
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if (shouldRecord(event)) {
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recordHistory();
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recording = false;
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}
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}, 300);
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const on = (type, fn) => {
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listeners.push([type, fn]);
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editor.addEventListener(type, fn);
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};
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on('keydown', event => {
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if (event.defaultPrevented)
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return;
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prev = toString();
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if (options.preserveIdent)
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handleNewLine(event);
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else
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legacyNewLineFix(event);
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if (options.catchTab)
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handleTabCharacters(event);
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if (options.addClosing)
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handleSelfClosingCharacters(event);
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if (options.history) {
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handleUndoRedo(event);
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if (shouldRecord(event) && !recording) {
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recordHistory();
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recording = true;
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}
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}
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if (isLegacy && !isCopy(event))
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restore(save());
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});
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on('keyup', event => {
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if (event.defaultPrevented)
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return;
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if (event.isComposing)
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return;
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if (prev !== toString())
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debounceHighlight();
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debounceRecordHistory(event);
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onUpdate(toString());
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});
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on('focus', _event => {
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focus = true;
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});
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on('blur', _event => {
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focus = false;
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});
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on('paste', event => {
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recordHistory();
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handlePaste(event);
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recordHistory();
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onUpdate(toString());
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});
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on('cut', event => {
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recordHistory();
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handleCut(event);
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recordHistory();
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onUpdate(toString());
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});
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function save() {
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const s = getSelection();
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const pos = { start: 0, end: 0, dir: undefined };
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let { anchorNode, anchorOffset, focusNode, focusOffset } = s;
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if (!anchorNode || !focusNode)
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throw 'error1';
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// If the anchor and focus are the editor element, return either a full
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// highlight or a start/end cursor position depending on the selection
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if (anchorNode === editor && focusNode === editor) {
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pos.start = (anchorOffset > 0 && editor.textContent) ? editor.textContent.length : 0;
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pos.end = (focusOffset > 0 && editor.textContent) ? editor.textContent.length : 0;
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pos.dir = (focusOffset >= anchorOffset) ? '->' : '<-';
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return pos;
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}
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// Selection anchor and focus are expected to be text nodes,
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// so normalize them.
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if (anchorNode.nodeType === Node.ELEMENT_NODE) {
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const node = document.createTextNode('');
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anchorNode.insertBefore(node, anchorNode.childNodes[anchorOffset]);
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anchorNode = node;
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anchorOffset = 0;
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}
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if (focusNode.nodeType === Node.ELEMENT_NODE) {
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const node = document.createTextNode('');
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focusNode.insertBefore(node, focusNode.childNodes[focusOffset]);
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focusNode = node;
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focusOffset = 0;
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}
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visit(editor, el => {
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if (el === anchorNode && el === focusNode) {
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pos.start += anchorOffset;
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pos.end += focusOffset;
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pos.dir = anchorOffset <= focusOffset ? '->' : '<-';
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return 'stop';
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}
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if (el === anchorNode) {
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pos.start += anchorOffset;
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if (!pos.dir) {
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pos.dir = '->';
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}
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else {
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return 'stop';
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}
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}
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else if (el === focusNode) {
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pos.end += focusOffset;
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if (!pos.dir) {
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pos.dir = '<-';
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}
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else {
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return 'stop';
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}
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}
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if (el.nodeType === Node.TEXT_NODE) {
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if (pos.dir != '->')
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pos.start += el.nodeValue.length;
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if (pos.dir != '<-')
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pos.end += el.nodeValue.length;
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}
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});
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editor.normalize(); // collapse empty text nodes
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return pos;
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}
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function restore(pos) {
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const s = getSelection();
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let startNode, startOffset = 0;
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let endNode, endOffset = 0;
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if (!pos.dir)
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pos.dir = '->';
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if (pos.start < 0)
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pos.start = 0;
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if (pos.end < 0)
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pos.end = 0;
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// Flip start and end if the direction reversed
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if (pos.dir == '<-') {
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const { start, end } = pos;
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pos.start = end;
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pos.end = start;
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}
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let current = 0;
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visit(editor, el => {
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if (el.nodeType !== Node.TEXT_NODE)
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return;
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const len = (el.nodeValue || '').length;
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if (current + len > pos.start) {
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if (!startNode) {
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startNode = el;
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startOffset = pos.start - current;
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}
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if (current + len > pos.end) {
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endNode = el;
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endOffset = pos.end - current;
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return 'stop';
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}
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}
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current += len;
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});
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if (!startNode)
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startNode = editor, startOffset = editor.childNodes.length;
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if (!endNode)
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endNode = editor, endOffset = editor.childNodes.length;
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// Flip back the selection
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if (pos.dir == '<-') {
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[startNode, startOffset, endNode, endOffset] = [endNode, endOffset, startNode, startOffset];
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}
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{
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// If nodes not editable, create a text node.
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const startEl = uneditable(startNode);
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if (startEl) {
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const node = document.createTextNode('');
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startEl.parentNode?.insertBefore(node, startEl);
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startNode = node;
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startOffset = 0;
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}
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const endEl = uneditable(endNode);
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if (endEl) {
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const node = document.createTextNode('');
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endEl.parentNode?.insertBefore(node, endEl);
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endNode = node;
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endOffset = 0;
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}
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}
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s.setBaseAndExtent(startNode, startOffset, endNode, endOffset);
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editor.normalize(); // collapse empty text nodes
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}
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function uneditable(node) {
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while (node && node !== editor) {
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if (node.nodeType === Node.ELEMENT_NODE) {
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const el = node;
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if (el.getAttribute('contenteditable') == 'false') {
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return el;
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}
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}
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node = node.parentNode;
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}
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}
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function beforeCursor() {
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const s = getSelection();
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const r0 = s.getRangeAt(0);
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const r = document.createRange();
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r.selectNodeContents(editor);
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r.setEnd(r0.startContainer, r0.startOffset);
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return r.toString();
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}
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function afterCursor() {
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const s = getSelection();
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const r0 = s.getRangeAt(0);
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const r = document.createRange();
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r.selectNodeContents(editor);
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r.setStart(r0.endContainer, r0.endOffset);
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return r.toString();
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}
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function handleNewLine(event) {
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if (event.key === 'Enter') {
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const before = beforeCursor();
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const after = afterCursor();
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let [padding] = findPadding(before);
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let newLinePadding = padding;
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// If last symbol is "{" ident new line
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if (options.indentOn.test(before)) {
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newLinePadding += options.tab;
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}
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// Preserve padding
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if (newLinePadding.length > 0) {
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preventDefault(event);
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event.stopPropagation();
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insert('\n' + newLinePadding);
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}
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else {
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legacyNewLineFix(event);
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}
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// Place adjacent "}" on next line
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if (newLinePadding !== padding && options.moveToNewLine.test(after)) {
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const pos = save();
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insert('\n' + padding);
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restore(pos);
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}
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}
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}
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function legacyNewLineFix(event) {
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// Firefox does not support plaintext-only mode
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// and puts <div><br></div> on Enter. Let's help.
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if (isLegacy && event.key === 'Enter') {
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preventDefault(event);
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event.stopPropagation();
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if (afterCursor() == '') {
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insert('\n ');
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const pos = save();
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pos.start = --pos.end;
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restore(pos);
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}
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else {
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insert('\n');
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}
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}
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}
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function handleSelfClosingCharacters(event) {
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const open = `([{'"`;
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const close = `)]}'"`;
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if (open.includes(event.key)) {
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preventDefault(event);
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const pos = save();
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const wrapText = pos.start == pos.end ? '' : getSelection().toString();
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const text = event.key + wrapText + close[open.indexOf(event.key)];
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insert(text);
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pos.start++;
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pos.end++;
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restore(pos);
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}
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}
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function handleTabCharacters(event) {
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if (event.key === 'Tab') {
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preventDefault(event);
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if (event.shiftKey) {
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const before = beforeCursor();
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let [padding, start] = findPadding(before);
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if (padding.length > 0) {
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const pos = save();
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// Remove full length tab or just remaining padding
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const len = Math.min(options.tab.length, padding.length);
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restore({ start, end: start + len });
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document.execCommand('delete');
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pos.start -= len;
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pos.end -= len;
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restore(pos);
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}
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}
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else {
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insert(options.tab);
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}
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}
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}
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function handleUndoRedo(event) {
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if (isUndo(event)) {
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preventDefault(event);
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at--;
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const record = history[at];
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if (record) {
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editor.innerHTML = record.html;
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restore(record.pos);
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}
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if (at < 0)
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at = 0;
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}
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if (isRedo(event)) {
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preventDefault(event);
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at++;
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const record = history[at];
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if (record) {
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editor.innerHTML = record.html;
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restore(record.pos);
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}
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if (at >= history.length)
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at--;
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}
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}
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function recordHistory() {
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if (!focus)
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return;
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const html = editor.innerHTML;
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const pos = save();
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const lastRecord = history[at];
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if (lastRecord) {
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if (lastRecord.html === html
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&& lastRecord.pos.start === pos.start
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&& lastRecord.pos.end === pos.end)
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return;
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}
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at++;
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history[at] = { html, pos };
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history.splice(at + 1);
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const maxHistory = 300;
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if (at > maxHistory) {
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at = maxHistory;
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history.splice(0, 1);
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}
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}
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function handlePaste(event) {
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if (event.defaultPrevented)
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return;
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preventDefault(event);
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const originalEvent = event.originalEvent ?? event;
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const text = originalEvent.clipboardData.getData('text/plain').replace(/\r\n?/g, '\n');
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|
|
const pos = save();
|
||
|
|
insert(text);
|
||
|
|
doHighlight(editor);
|
||
|
|
restore({
|
||
|
|
start: Math.min(pos.start, pos.end) + text.length,
|
||
|
|
end: Math.min(pos.start, pos.end) + text.length,
|
||
|
|
dir: '<-',
|
||
|
|
});
|
||
|
|
}
|
||
|
|
function handleCut(event) {
|
||
|
|
const pos = save();
|
||
|
|
const selection = getSelection();
|
||
|
|
const originalEvent = event.originalEvent ?? event;
|
||
|
|
originalEvent.clipboardData.setData('text/plain', selection.toString());
|
||
|
|
document.execCommand('delete');
|
||
|
|
doHighlight(editor);
|
||
|
|
restore({
|
||
|
|
start: Math.min(pos.start, pos.end),
|
||
|
|
end: Math.min(pos.start, pos.end),
|
||
|
|
dir: '<-',
|
||
|
|
});
|
||
|
|
preventDefault(event);
|
||
|
|
}
|
||
|
|
function visit(editor, visitor) {
|
||
|
|
const queue = [];
|
||
|
|
if (editor.firstChild)
|
||
|
|
queue.push(editor.firstChild);
|
||
|
|
let el = queue.pop();
|
||
|
|
while (el) {
|
||
|
|
if (visitor(el) === 'stop')
|
||
|
|
break;
|
||
|
|
if (el.nextSibling)
|
||
|
|
queue.push(el.nextSibling);
|
||
|
|
if (el.firstChild)
|
||
|
|
queue.push(el.firstChild);
|
||
|
|
el = queue.pop();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
function isCtrl(event) {
|
||
|
|
return event.metaKey || event.ctrlKey;
|
||
|
|
}
|
||
|
|
function isUndo(event) {
|
||
|
|
return isCtrl(event) && !event.shiftKey && getKeyCode(event) === 'Z';
|
||
|
|
}
|
||
|
|
function isRedo(event) {
|
||
|
|
return isCtrl(event) && event.shiftKey && getKeyCode(event) === 'Z';
|
||
|
|
}
|
||
|
|
function isCopy(event) {
|
||
|
|
return isCtrl(event) && getKeyCode(event) === 'C';
|
||
|
|
}
|
||
|
|
function getKeyCode(event) {
|
||
|
|
let key = event.key || event.keyCode || event.which;
|
||
|
|
if (!key)
|
||
|
|
return undefined;
|
||
|
|
return (typeof key === 'string' ? key : String.fromCharCode(key)).toUpperCase();
|
||
|
|
}
|
||
|
|
function insert(text) {
|
||
|
|
text = text
|
||
|
|
.replace(/&/g, '&')
|
||
|
|
.replace(/</g, '<')
|
||
|
|
.replace(/>/g, '>')
|
||
|
|
.replace(/"/g, '"')
|
||
|
|
.replace(/'/g, ''');
|
||
|
|
document.execCommand('insertHTML', false, text);
|
||
|
|
}
|
||
|
|
function debounce(cb, wait) {
|
||
|
|
let timeout = 0;
|
||
|
|
return (...args) => {
|
||
|
|
clearTimeout(timeout);
|
||
|
|
timeout = window.setTimeout(() => cb(...args), wait);
|
||
|
|
};
|
||
|
|
}
|
||
|
|
function findPadding(text) {
|
||
|
|
// Find beginning of previous line.
|
||
|
|
let i = text.length - 1;
|
||
|
|
while (i >= 0 && text[i] !== '\n')
|
||
|
|
i--;
|
||
|
|
i++;
|
||
|
|
// Find padding of the line.
|
||
|
|
let j = i;
|
||
|
|
while (j < text.length && /[ \t]/.test(text[j]))
|
||
|
|
j++;
|
||
|
|
return [text.substring(i, j) || '', i, j];
|
||
|
|
}
|
||
|
|
function toString() {
|
||
|
|
return editor.textContent || '';
|
||
|
|
}
|
||
|
|
function preventDefault(event) {
|
||
|
|
event.preventDefault();
|
||
|
|
}
|
||
|
|
function getSelection() {
|
||
|
|
if (editor.parentNode?.nodeType == Node.DOCUMENT_FRAGMENT_NODE) {
|
||
|
|
return editor.parentNode.getSelection();
|
||
|
|
}
|
||
|
|
return window.getSelection();
|
||
|
|
}
|
||
|
|
return {
|
||
|
|
updateOptions(newOptions) {
|
||
|
|
Object.assign(options, newOptions);
|
||
|
|
},
|
||
|
|
updateCode(code) {
|
||
|
|
editor.textContent = code;
|
||
|
|
doHighlight(editor);
|
||
|
|
onUpdate(code);
|
||
|
|
},
|
||
|
|
onUpdate(callback) {
|
||
|
|
onUpdate = callback;
|
||
|
|
},
|
||
|
|
toString,
|
||
|
|
save,
|
||
|
|
restore,
|
||
|
|
recordHistory,
|
||
|
|
destroy() {
|
||
|
|
for (let [type, fn] of listeners) {
|
||
|
|
editor.removeEventListener(type, fn);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
};
|
||
|
|
}
|