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* Sketch File Builder
*
* Handles the construction of Arduino sketch files by wrapping user code
* with the Arduino mock implementation and generating appropriate main() wrappers.
*/
import { join, dirname } from "node:path";
import { mkdir, writeFile } from "node:fs/promises";
import { ARDUINO_MOCK_CODE } from "./arduino-mock";
import { Logger } from "@shared/logger";
import { detectSketchEntrypoints } from "@shared/utils/sketch-validation";
import { isSafeHeaderName } from "@shared/input-limits";
import { resolvePathWithinRoot } from "../security/safe-paths";
import { normalizeSourcePath, resolveSourceProject } from "@shared/source-project";
import { insertForwardDeclarations, planForwardDeclarations } from "./sketch-prototypes";
interface SketchBuildResult {
sketchDir: string;
sketchFile: string;
exeFile: string;
}
export function extractForwardDeclarations(code: string): string {
return planForwardDeclarations(code).declarations;
}
export class SketchFileBuilder {
private readonly logger = new Logger("SketchFileBuilder");
private readonly createdSketchDirs = new Set<string>();
constructor(private readonly tempDir: string) {}
/**
* Builds a complete sketch file with Arduino mock and user code
*
* @param code - User's Arduino code
* @param sketchId - Unique identifier for this sketch
* @returns Paths to sketch directory and files
*/
async build(
code: string,
sketchId: string,
headers: Array<{ name: string; content: string }> = [],
entryFile?: string,
): Promise<SketchBuildResult> {
const sketchDir = join(this.tempDir, sketchId);
const sketchFile = join(sketchDir, "sketch.cpp");
const exeFile = join(sketchDir, "sketch");
try {
await mkdir(sketchDir, { recursive: true });
this.createdSketchDirs.add(sketchDir);
} catch (err) {
const msg = err instanceof Error ? err.message : String(err);
this.logger.error(`Failed to create sketch directory: ${msg}`);
throw err;
}
const { hasSetup, hasLoop } = detectSketchEntrypoints(code);
if (!hasSetup && !hasLoop) {
this.logger.warn(
"Weder setup() noch loop() gefunden - Code wird nur als Bibliothek kompiliert",
);
}
const footer = this.buildFooter(hasSetup, hasLoop);
const project = entryFile
? resolveSourceProject({
entryFile,
files: {
[entryFile]: code,
...headers.reduce<Record<string, string>>((files, header) => {
files[header.name] = header.content;
return files;
}, {}),
},
})
: undefined;
const projectSource = project ? project.source : code;
// Removing the include keeps every line in place, so lineOrigins still match.
const cleanedCode = projectSource.replaceAll(/#include\s*[<"]Arduino\.h[>"]/g, "");
const isSketchLine = project
? (lineIndex: number) => project.lineOrigins[lineIndex]?.file === project.entryFile
: undefined;
const userCode = insertForwardDeclarations(cleanedCode, isSketchLine);
const combined = `#include <Arduino.h>\n\n// --- User code follows ---\n${userCode}\n\n// --- Footer ---\n${footer}`;
await writeFile(join(sketchDir, "Arduino.h"), ARDUINO_MOCK_CODE);
await writeFile(sketchFile, combined);
for (const header of headers) {
const normalizedPath = normalizeSourcePath(header.name);
Iif (!normalizedPath?.split("/").every(isSafeHeaderName)) {
throw new Error(`Unsafe header name: ${header.name}`);
}
const headerPath = resolvePathWithinRoot(sketchDir, normalizedPath);
await mkdir(dirname(headerPath), { recursive: true });
await writeFile(headerPath, header.content);
}
return { sketchDir, sketchFile, exeFile };
}
getCreatedSketchDirs(): string[] {
return Array.from(this.createdSketchDirs);
}
clearCreatedSketchDir(dir: string): void {
this.createdSketchDirs.delete(dir);
}
/**
* Generates the main() wrapper based on presence of setup() and loop()
*/
private buildFooter(hasSetup: boolean, hasLoop: boolean): string {
let footer = `
#include <thread>
#include <atomic>
#include <cstring>
#include <chrono>
int main() {
// Initialize IO registry for pin state tracking
initIORegistry();
// Start background thread for serial input
std::thread readerThread(serialInputReader);
readerThread.detach();
`;
if (hasSetup) {
footer += `
// Call user's setup() function
setup();
Serial.flush();
`;
}
if (hasLoop) {
footer += `
// Run user's loop() function continuously
bool __registry_sent = false;
while (1) {
Serial.flush();
loop();
// Send registry after first loop iteration
if (!__registry_sent) {
Serial.flush();
outputIORegistry();
__registry_sent = true;
}
// Sleep 1ms to prevent 100% CPU usage (Arduino runs at ~16MHz, so 1ms is reasonable throttle)
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
`;
} else {
footer += `
// No loop() function, just output registry once
outputIORegistry();
`;
}
footer += `
Serial.flush();
// Cleanup: stop serial input reader
keepReading.store(false);
return 0;
}
`;
return footer;
}
}
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