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import { invoke, Channel } from '@tauri-apps/api/core';
import { getCurrentWindow } from '@tauri-apps/api/window';
import { open, save, message } from '@tauri-apps/plugin-dialog';
import { KeyCode, KeyMod } from 'monaco-editor/editor/editor.api.js';
import { StandardKeyboardEvent } from 'monaco-editor/base/browser/keyboardEvent.js';
import { createEditor, themeVariable } from './editor.js';
import { createAnsiParser } from './ansi.js';
import './style.css';
const status = document.querySelector('#status');
const filename = document.querySelector('#filename');
const input = document.querySelector('#input');
const output = document.querySelector('#output');
const runButton = document.querySelector('#run');
const window = getCurrentWindow();
const filters = [{ name: 'Pseudocode', extensions: ['cps'] }];
let path = null;
let savedText = '';
let busy = false;
let actionDone = Promise.resolve();
let closing = false;
let editor;
let running = false;
function setRunning(value) {
running = value;
runButton.textContent = value ? 'Stop' : 'Run';
for (const id of ['new', 'open', 'save']) document.getElementById(id).disabled = value;
input.disabled = value;
editor.updateOptions({ readOnly: value || closing });
}
async function runFile() {
if (!await saveFile()) return;
if (closing) return;
setRunning(true);
output.textContent = '';
status.textContent = 'Running';
const decoders = { stdout: new TextDecoder(), stderr: new TextDecoder() };
// Only compiler diagnostics on stderr are colored; program output stays verbatim.
const diagnostics = createAnsiParser();
const pending = document.createDocumentFragment();
let frame = null;
function flush() {
frame = null;
if (!pending.hasChildNodes()) return;
output.append(pending);
output.scrollTop = output.scrollHeight;
}
function append(stream, text) {
for (const run of stream === 'stderr' ? diagnostics(text) : [{ text }]) {
if (!run.text) continue;
if (!run.bold && !run.color) {
if (pending.lastChild?.nodeType === Node.TEXT_NODE) pending.lastChild.appendData(run.text);
else pending.append(run.text);
continue;
}
const span = document.createElement('span');
if (run.bold) span.style.fontWeight = 'bold';
if (run.color) span.style.color = `var(${themeVariable(run.color)})`;
span.textContent = run.text;
pending.append(span);
}
if (frame === null) frame = requestAnimationFrame(flush);
}
let finish;
const finished = new Promise(resolve => { finish = resolve; });
const channel = new Channel(event => {
if (event.event === 'data') {
append(event.stream, decoders[event.stream].decode(Uint8Array.from(event.bytes), { stream: true }));
} else if (event.event === 'finished') {
for (const [stream, decoder] of Object.entries(decoders)) append(stream, decoder.decode());
if (frame !== null) cancelAnimationFrame(frame);
flush();
status.textContent = event.stopped ? 'Stopped' : `Exit code: ${event.code ?? 'terminated'}`;
finish();
}
});
try {
await invoke('run_file', { path, input: input.value, output: channel });
await finished;
} finally {
if (frame !== null) cancelAnimationFrame(frame);
flush();
setRunning(false);
}
}
function dirty() { return editor.getValue() !== savedText; }
function refreshTitle() {
const name = path ? path.split(/[\\/]/).pop() : 'Untitled.cps';
filename.textContent = `${dirty() ? '* ' : ''}${name}`;
filename.title = path || name;
window.setTitle(`${dirty() ? '* ' : ''}${name} — CPSC Bundle`);
}
function report(error) { status.textContent = String(error); }
async function saveFile() {
const target = path || await save({ filters, defaultPath: 'Untitled.cps' });
if (!target) return false;
const text = editor.getValue();
await invoke('write_file', { path: target, text });
path = target;
savedText = text;
refreshTitle();
status.textContent = 'Saved';
return true;
}
async function canReplace() {
if (!dirty()) return true;
const answer = await message('Save changes?', {
title: 'CPSC Bundle', kind: 'warning',
buttons: { yes: 'Save', no: 'Discard', cancel: 'Cancel' }
});
if (answer === 'Cancel') return false;
return answer === 'Discard' || await saveFile();
}
async function newFile() {
if (!await canReplace()) return;
path = null;
savedText = '';
editor.setValue('');
refreshTitle();
status.textContent = 'Ready';
}
async function openFile() {
if (!await canReplace()) return;
const target = await open({ filters, multiple: false });
if (!target) return;
const text = await invoke('read_file', { path: target });
path = target;
savedText = text;
editor.setValue(text);
refreshTitle();
status.textContent = 'Ready';
}
async function action(callback) {
if (busy || running || closing) return;
busy = true;
actionDone = (async () => {
try { await callback(); } catch (error) { report(error); } finally { busy = false; }
})();
await actionDone;
}
function editorAction(id) { editor.focus(); editor.getAction(id).run(); }
// Keyed by the menu item ids in src-tauri/src/menu.rs.
const commands = {
new: () => action(newFile),
// Each window is an independent native OS window, even while this one runs.
new_window: () => invoke('new_window').catch(report),
open: () => action(openFile),
save: () => action(saveFile),
find: () => editorAction('actions.find'),
comment: () => editorAction('editor.action.commentLine'),
run: () => running ? invoke('stop_run').catch(report) : action(runFile)
};
// CtrlCmd is Cmd on macOS and Ctrl elsewhere, matching Monaco's own keybindings and the menu.
const shortcuts = [
[KeyMod.CtrlCmd | KeyCode.KeyN, 'new'],
[KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.KeyN, 'new_window'],
[KeyMod.CtrlCmd | KeyCode.KeyO, 'open'],
[KeyMod.CtrlCmd | KeyCode.KeyS, 'save'],
[KeyMod.CtrlCmd | KeyCode.KeyF, 'find'],
[KeyMod.CtrlCmd | KeyCode.Slash, 'comment'],
[KeyCode.F5, 'run']
];
try {
editor = await createEditor(document.querySelector('#editor'));
editor.onDidChangeModelContent(refreshTitle);
runButton.onclick = commands.run;
document.querySelector('#save').onclick = () => action(saveFile);
document.querySelector('#new').onclick = () => action(newFile);
document.querySelector('#open').onclick = () => action(openFile);
document.addEventListener('keydown', event => {
// Monaco already handled its own keybindings, such as Find inside the editor.
if (event.defaultPrevented) return;
const key = new StandardKeyboardEvent(event);
const shortcut = shortcuts.find(([binding]) => key.equals(binding));
if (!shortcut) return;
event.preventDefault();
commands[shortcut[1]]();
});
await window.listen('menu', event => commands[event.payload]());
await window.onCloseRequested(async event => {
event.preventDefault();
if (closing) return;
closing = true;
editor.updateOptions({ readOnly: true });
try {
if (running) await invoke('stop_run');
// Finish any pending save/open or stopped run before closing the document.
await actionDone;
if (!await canReplace()) return;
await window.destroy();
} catch (error) { report(error); } finally {
closing = false;
editor.updateOptions({ readOnly: running });
}
});
editor.focus();
} catch (error) { report(error); }
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