493 lines
13 KiB
JavaScript
493 lines
13 KiB
JavaScript
const calc = new RpnCalculator({ angleMode: 'deg' });
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const input = document.getElementById('input');
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const screen = document.getElementById('screen');
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const stackEl = document.getElementById('stack');
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const displayEl = document.getElementById('display');
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const errorEl = document.getElementById('error');
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const inputValueLabel = document.getElementById('inputValueLabel');
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const editingLabel = document.getElementById('editingLabel');
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const modeLabel = document.getElementById('modeLabel');
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const angleMode = document.getElementById('angleMode');
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const groups = {
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stack: ['enter', 'dup', 'drop', 'swap', 'clear'],
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arithmetic: ['add', 'sub', 'mul', 'div', 'mod', 'pow', 'sqr', 'neg', 'sqrt', 'recip', 'log', 'ln'],
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trig: ['sin', 'cos', 'tan', 'asin', 'acos', 'atan'],
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const: ['pi', 'e'],
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};
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let stackCursor = null;
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let isMovingStackItem = false;
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let stackSnapshotBeforeMove = null;
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let stackViewOffset = 0;
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let editRestoreValue = null;
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function labelFor(command) {
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return ({ add: '+', sub: '−', mul: '×', div: '÷', pow: 'y^x', recip: '1/x', sqr: 'x²' }[command] || command);
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}
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function addButtons(container, commands) {
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container.innerHTML = '';
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commands.forEach((commandName) => {
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const button = document.createElement('button');
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button.textContent = labelFor(commandName);
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button.addEventListener('click', () => execute(commandName));
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container.appendChild(button);
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});
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}
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function getStackValue(index) {
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return calc.isValidIndex(index) ? calc.stack[index] : undefined;
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}
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function getDisplayValue(index) {
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if (calc.isEditing) {
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if (index === 0) {
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return calc.inputValue;
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}
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return getStackValue(index - 1);
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}
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return getStackValue(index);
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}
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function hasStackSelection() {
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return stackCursor !== null && calc.isValidIndex(stackCursor);
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}
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function clearStackSelection() {
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stackCursor = null;
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isMovingStackItem = false;
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stackSnapshotBeforeMove = null;
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stackViewOffset = 0;
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}
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function ensureValidSelection() {
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if (hasStackSelection()) {
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return;
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}
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stackCursor = calc.isValidIndex(0) ? 0 : null;
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}
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function beginMoveMode() {
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if (!hasStackSelection()) {
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return;
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}
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isMovingStackItem = true;
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stackSnapshotBeforeMove = calc.stack.slice();
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}
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function commitMoveMode() {
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isMovingStackItem = false;
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stackSnapshotBeforeMove = null;
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}
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function cancelMoveMode() {
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if (!isMovingStackItem || !stackSnapshotBeforeMove) {
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return;
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}
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const snapshot = stackSnapshotBeforeMove.slice();
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calc.clear();
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for (let index = snapshot.length - 1; index >= 0; index -= 1) {
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calc.push(snapshot[index]);
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}
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isMovingStackItem = false;
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stackSnapshotBeforeMove = null;
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stackCursor = calc.isValidIndex(stackCursor) ? stackCursor : (calc.isValidIndex(0) ? 0 : null);
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syncInputFromState();
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}
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function reactivateEditOnX() {
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clearStackSelection();
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if (calc.isValidIndex(0)) {
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const value = getStackValue(0);
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calc.remove(0);
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calc.inputValue = calc.formatNumber(value);
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calc.isEditing = true;
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editRestoreValue = value;
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} else {
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calc.inputValue = '';
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calc.isEditing = true;
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editRestoreValue = null;
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}
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syncInputFromState();
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}
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function moveStackSelection(direction) {
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if (!hasStackSelection()) {
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if (direction === 'up') {
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ensureValidSelection();
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} else if (direction === 'down') {
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reactivateEditOnX();
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}
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return;
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}
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const nextIndex = direction === 'up' ? stackCursor + 1 : stackCursor - 1;
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if (calc.isValidIndex(nextIndex)) {
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stackCursor = nextIndex;
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}
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}
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function moveStackItem(direction) {
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if (!hasStackSelection()) {
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return;
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}
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const targetIndex = direction === 'up' ? stackCursor + 1 : stackCursor - 1;
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if (!calc.isValidIndex(targetIndex)) {
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return;
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}
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calc.swap(stackCursor, targetIndex);
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stackCursor = targetIndex;
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}
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function getVisibleStackIndex(visualLine) {
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return stackViewOffset + visualLine;
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}
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function clampStackViewOffset() {
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const maxOffset = Math.max(0, calc.stack.length - 4);
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if (stackViewOffset < 0) {
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stackViewOffset = 0;
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} else if (stackViewOffset > maxOffset) {
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stackViewOffset = maxOffset;
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}
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}
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function ensureSelectionVisible() {
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if (!hasStackSelection()) {
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stackViewOffset = 0;
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return;
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}
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if (stackCursor < stackViewOffset) {
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stackViewOffset = stackCursor;
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} else if (stackCursor > stackViewOffset + 3) {
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stackViewOffset = stackCursor - 3;
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}
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clampStackViewOffset();
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}
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function render() {
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const names = ['T', 'Z', 'Y', 'X'];
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const lines = [];
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const showStackIndexes = hasStackSelection() || isMovingStackItem;
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clampStackViewOffset();
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ensureSelectionVisible();
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for (let visualLine = 3; visualLine >= 0; visualLine -= 1) {
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const stackIndex = getVisibleStackIndex(visualLine);
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const value = getDisplayValue(stackIndex);
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const isSelected = stackCursor === stackIndex;
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const classes = ['stack-line'];
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const label = showStackIndexes ? String(stackIndex) : names[3 - visualLine];
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if (isSelected) {
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classes.push(isMovingStackItem ? 'moving' : 'selected');
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}
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lines.push(`<div class="${classes.join(' ')}"><div class="label">${label}</div><div>${value !== undefined && value !== '' ? calc.formatNumber(value) : ''}</div></div>`);
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}
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stackEl.innerHTML = lines.join('');
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if (calc.isEditing) {
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displayEl.textContent = `ENTERING: ${calc.inputValue}`;
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} else if (isMovingStackItem && hasStackSelection()) {
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displayEl.textContent = `MOVING: ${stackCursor}`;
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} else if (hasStackSelection()) {
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displayEl.textContent = `SELECTED: ${stackCursor}`;
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} else {
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displayEl.textContent = 'READY';
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}
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inputValueLabel.textContent = calc.inputValue || '∅';
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editingLabel.textContent = String(calc.isEditing);
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modeLabel.textContent = calc.angleMode;
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angleMode.value = calc.angleMode;
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errorEl.textContent = '';
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}
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function pushEditingValueIfNeeded() {
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if (!calc.isEditing) return;
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if (calc.inputValue !== '') {
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const value = calc.parseInputValue(calc.inputValue);
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calc.push(value);
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}
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calc.inputValue = '';
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calc.isEditing = false;
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editRestoreValue = null;
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syncInputFromState();
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}
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function execute(name) {
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try {
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if (name === 'enter') {
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if (calc.isEditing) {
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pushEditingValueIfNeeded();
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} else if (calc.isValidIndex(0)) {
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calc.push(getStackValue(0));
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}
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} else if (name === 'swap') {
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pushEditingValueIfNeeded();
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clearStackSelection();
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if (calc.isValidIndex(1)) calc.swap(0, 1);
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} else if (name === 'drop') {
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pushEditingValueIfNeeded();
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if (hasStackSelection()) {
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calc.remove(stackCursor);
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stackCursor = calc.isValidIndex(stackCursor) ? stackCursor : (calc.isValidIndex(stackCursor - 1) ? stackCursor - 1 : null);
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} else if (calc.isValidIndex(0)) {
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calc.remove(0);
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}
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commitMoveMode();
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} else if (name === 'clear') {
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calc.clear();
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clearStackSelection();
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} else {
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pushEditingValueIfNeeded();
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clearStackSelection();
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calc.command(name);
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}
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syncInputFromState();
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render();
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} catch (error) {
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errorEl.textContent = error.message;
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}
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}
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function isInputChar(key) {
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return /^[0-9a-fA-F.]$/.test(key);
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}
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function shouldIgnoreKeyboardEvent(event) {
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const target = event.target;
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if (!target) return false;
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const tagName = target.tagName;
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return (
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tagName === 'INPUT' ||
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tagName === 'TEXTAREA' ||
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tagName === 'SELECT' ||
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target.isContentEditable
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);
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}
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function getKeyboardAction(event) {
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const numpadMap = {
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Numpad0: { type: 'input', value: '0' },
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Numpad1: { type: 'input', value: '1' },
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Numpad2: { type: 'input', value: '2' },
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Numpad3: { type: 'input', value: '3' },
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Numpad4: { type: 'input', value: '4' },
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Numpad5: { type: 'input', value: '5' },
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Numpad6: { type: 'input', value: '6' },
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Numpad7: { type: 'input', value: '7' },
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Numpad8: { type: 'input', value: '8' },
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Numpad9: { type: 'input', value: '9' },
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NumpadDecimal: { type: 'input', value: '.' },
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NumpadAdd: { type: 'command', value: 'add' },
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NumpadSubtract: { type: 'command', value: 'sub' },
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NumpadMultiply: { type: 'command', value: 'mul' },
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NumpadDivide: { type: 'command', value: 'div' },
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NumpadEnter: { type: 'command', value: 'enter' },
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};
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if (numpadMap[event.code]) {
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return numpadMap[event.code];
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}
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if (isInputChar(event.key)) {
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return { type: 'input', value: event.key };
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}
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const keyMap = {
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Enter: { type: 'enterKey' },
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Backspace: { type: 'stackOrEdit', value: 'drop' },
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Delete: { type: 'command', value: 'clear' },
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Escape: { type: 'escapeKey' },
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ArrowUp: { type: 'stackArrow', value: 'up' },
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ArrowDown: { type: 'stackArrow', value: 'down' },
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ArrowRight: { type: 'command', value: 'swap' },
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'+': { type: 'command', value: 'add' },
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'-': { type: 'command', value: 'sub' },
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'*': { type: 'command', value: 'mul' },
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'/': { type: 'command', value: 'div' },
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'%': { type: 'command', value: 'mod' },
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'^': { type: 'command', value: 'pow' },
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q: { type: 'command', value: 'sqr' },
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n: { type: 'command', value: 'neg' },
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r: { type: 'command', value: 'sqrt' },
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i: { type: 'command', value: 'recip' },
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g: { type: 'command', value: 'log' },
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l: { type: 'command', value: 'ln' },
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s: { type: 'command', value: 'sin' },
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c: { type: 'command', value: 'cos' },
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S: { type: 'command', value: 'asin' },
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C: { type: 'command', value: 'acos' },
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x: { type: 'stackSelect', value: 0 },
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y: { type: 'stackSelect', value: 1 },
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z: { type: 'stackSelect', value: 2 },
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t: { type: 'stackSelect', value: 3 },
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X: { type: 'stackSelect', value: 0 },
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Y: { type: 'stackSelect', value: 1 },
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Z: { type: 'stackSelect', value: 2 },
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T: { type: 'stackSelect', value: 3 },
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};
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return keyMap[event.key] || null;
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}
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function focusScreen() {
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screen.focus();
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}
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function syncInputFromState() {
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input.value = calc.inputValue;
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}
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function editXWithKey(key) {
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if (!calc.isEditing) {
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pushEditingValueIfNeeded();
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calc.isEditing = true;
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calc.inputValue = '';
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editRestoreValue = null;
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}
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if (key === 'Backspace') {
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calc.inputValue = calc.inputValue.slice(0, -1);
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} else {
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calc.inputValue += key;
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}
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if (calc.inputValue === '') {
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calc.isEditing = false;
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editRestoreValue = null;
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}
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syncInputFromState();
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}
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function handleKeydown(event) {
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if (shouldIgnoreKeyboardEvent(event)) {
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return;
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}
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const action = getKeyboardAction(event);
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if (!action) {
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return;
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}
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try {
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if (action.type === 'escapeKey') {
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if (calc.isEditing) {
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event.preventDefault();
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if (editRestoreValue !== null) {
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calc.push(editRestoreValue);
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editRestoreValue = null;
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}
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calc.inputValue = '';
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calc.isEditing = false;
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syncInputFromState();
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render();
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return;
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}
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if (isMovingStackItem) {
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event.preventDefault();
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cancelMoveMode();
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clearStackSelection();
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render();
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return;
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}
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if (hasStackSelection()) {
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event.preventDefault();
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clearStackSelection();
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render();
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}
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return;
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}
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event.preventDefault();
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if (action.type === 'input') {
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clearStackSelection();
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editXWithKey(action.value);
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render();
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return;
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}
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if (action.type === 'stackSelect') {
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if (calc.isEditing || isMovingStackItem) {
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return;
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}
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stackCursor = calc.isValidIndex(action.value) ? action.value : null;
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render();
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return;
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}
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if (action.type === 'stackArrow') {
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if (calc.isEditing) {
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render();
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return;
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}
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if (isMovingStackItem) {
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moveStackItem(action.value);
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} else {
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moveStackSelection(action.value);
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}
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render();
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return;
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}
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if (action.type === 'stackOrEdit') {
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if (calc.isEditing) {
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editXWithKey('Backspace');
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render();
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} else {
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execute(action.value);
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}
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return;
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}
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if (action.type === 'enterKey') {
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if (hasStackSelection()) {
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if (isMovingStackItem) {
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commitMoveMode();
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} else {
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beginMoveMode();
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}
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render();
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return;
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}
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execute('enter');
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return;
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}
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if (action.type === 'command') {
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execute(action.value);
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}
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} catch (error) {
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errorEl.textContent = error.message;
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}
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}
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window.addEventListener('keydown', handleKeydown);
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screen.addEventListener('click', focusScreen);
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window.addEventListener('load', focusScreen);
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angleMode.addEventListener('change', (event) => {
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calc.angleMode = event.target.value;
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render();
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});
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addButtons(document.getElementById('stackButtons'), groups.stack);
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addButtons(document.getElementById('arithButtons'), groups.arithmetic);
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addButtons(document.getElementById('trigButtons'), groups.trig);
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addButtons(document.getElementById('constButtons'), groups.const);
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render();
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focusScreen();
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