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// Pure parsing logic for Arduino C++ mock output
import { Logger } from "@shared/logger";
import type { IOPinRecord } from "@shared/schema";
const logger = new Logger("ArduinoOutputParser");
/**
* Parsed stderr output types (discriminated union for type safety)
*/
export type ParsedStderrOutput =
| { type: "serial_event"; timestamp: number; data: string }
| { type: "registry_start" }
| { type: "registry_end" }
| {
type: "registry_pin";
pinRecord: IOPinRecord;
}
| { type: "pin_mode"; pin: number; mode: number }
| { type: "pin_value"; pin: number; value: number }
| { type: "pin_pwm"; pin: number; value: number }
| { type: "debug_marker"; marker: string }
| { type: "text"; line: string }
| { type: "ignored" };
/**
* ArduinoOutputParser - Stateless parser for Arduino mock output
*
* Responsibilities:
* - Parse stderr lines from C++ Arduino mock
* - Extract structured data (serial events, pin states, registry)
* - No side effects - pure functions only
*/
export class ArduinoOutputParser {
private static readonly PATTERNS = {
serialEvent: /\[\[SERIAL_EVENT:(\d+):([A-Za-z0-9+/=]+)\]\]/,
registryStart: /\[\[IO_REGISTRY_START\]\]/,
registryEnd: /\[\[IO_REGISTRY_END\]\]/,
registryPin: /\[\[IO_PIN:([^:]+):([01]):(\d+):(\d+):?(.*)\]\]/,
pinMode: /\[\[PIN_MODE:(\d+):(\d+)\]\]/,
pinValue: /\[\[PIN_VALUE:(\d+):(\d+)\]\]/,
pinPwm: /\[\[PIN_PWM:(\d+):(\d+)\]\]/,
// Debug markers - should be ignored
digitalRead: /\[\[DREAD:(\d+):(\d+)\]\]/,
pinSet: /\[\[PIN_SET:(\d+):(\d+)\]\]/,
stdinRecv: /\[\[STDIN_RECV:(.+)\]\]/,
// Pause/Resume timing markers - should be ignored
timeFrozen: /\[\[TIME_FROZEN:(\d+)\]\]/,
timeResumed: /\[\[TIME_RESUMED:(\d+)\]\]/,
};
/**
* Parse a single stderr line from Arduino mock process
* Priority order: registry markers > pin states > serial events > text
*
* @param line - Raw stderr line
* @param processStartTime - Server timestamp when process started (for serial event timestamps)
* @returns Structured ParsedStderrOutput object
*/
parseStderrLine(
line: string,
processStartTime: number | null,
): ParsedStderrOutput {
// Priority 1: Registry markers (start/end)
if (ArduinoOutputParser.PATTERNS.registryStart.test(line)) {
return { type: "registry_start" };
}
if (ArduinoOutputParser.PATTERNS.registryEnd.test(line)) {
return { type: "registry_end" };
}
// Priority 2: Registry pin data
const registryPinMatch = line.match(
ArduinoOutputParser.PATTERNS.registryPin,
);
if (registryPinMatch) {
const pinRecord = this.parseRegistryPin(registryPinMatch);
Eif (pinRecord) {
return { type: "registry_pin", pinRecord };
}
}
// Priority 3: Pin state changes
const pinModeMatch = line.match(ArduinoOutputParser.PATTERNS.pinMode);
if (pinModeMatch) {
return {
type: "pin_mode",
pin: parseInt(pinModeMatch[1]),
mode: parseInt(pinModeMatch[2]),
};
}
const pinValueMatch = line.match(ArduinoOutputParser.PATTERNS.pinValue);
if (pinValueMatch) {
return {
type: "pin_value",
pin: parseInt(pinValueMatch[1]),
value: parseInt(pinValueMatch[2]),
};
}
const pinPwmMatch = line.match(ArduinoOutputParser.PATTERNS.pinPwm);
if (pinPwmMatch) {
return {
type: "pin_pwm",
pin: parseInt(pinPwmMatch[1]),
value: parseInt(pinPwmMatch[2]),
};
}
// Priority 4: Serial events
const serialEventMatch = line.match(
ArduinoOutputParser.PATTERNS.serialEvent,
);
if (serialEventMatch) {
const parsed = this.parseSerialEvent(
serialEventMatch[1],
serialEventMatch[2],
processStartTime,
);
Eif (parsed) {
return parsed;
}
}
// Priority 5: Debug markers (ignore these)
if (
ArduinoOutputParser.PATTERNS.digitalRead.test(line) ||
ArduinoOutputParser.PATTERNS.pinSet.test(line) ||
ArduinoOutputParser.PATTERNS.stdinRecv.test(line) ||
ArduinoOutputParser.PATTERNS.timeFrozen.test(line) ||
ArduinoOutputParser.PATTERNS.timeResumed.test(line)
) {
return { type: "ignored" };
}
// Priority 6: Protocol fragments (from interrupted writes during SIGSTOP/SIGCONT
// or from thread-interleaved stderr output before the cerrMutex fix).
// These occur when C++ is mid-write of a [[...]] message when SIGSTOP arrives,
// or when two threads wrote to stderr concurrently without proper locking.
// After SIGCONT, the rest of the message (e.g., "]]") arrives as a separate chunk.
//
// Patterns to catch:
// "]]" standalone closing brackets
// "[[" standalone opening brackets
// "[[SERIAL_EVENT:" (no "]]") partial protocol header
// "4579:WzAw...Cg==]]" tail of a split SERIAL_EVENT (timestamp:base64]])
// "WzAwMDAwMl0g...Cg==]]" base64 tail + closing brackets
if (
line === "]]" ||
line === "[[" ||
(/^\[\[.{0,50}$/.test(line) && !line.includes("]]")) || // Partial [[... without closing
/^[A-Za-z0-9+/=:]{1,}\]\]$/.test(line) || // timestamp:base64 tail + ]]
/^\d+:[A-Za-z0-9+/=]+/.test(line) // timestamp:base64 (no brackets)
) {
logger.debug(`Ignoring protocol fragment: ${line.substring(0, 80)}...`);
return { type: "ignored" };
}
// Default: Regular text (error/warning message)
return { type: "text", line };
}
/**
* Parse serial event from base64 encoded data
*
* @param timestampStr - Raw timestamp string (millis since process start)
* @param base64Data - Base64 encoded serial data
* @param processStartTime - Server-side process start timestamp
* @returns Parsed serial event or null on error
*/
private parseSerialEvent(
timestampStr: string,
base64Data: string,
processStartTime: number | null,
): ParsedStderrOutput | null {
try {
const ts = parseInt(timestampStr, 10);
const buf = Buffer.from(base64Data, "base64");
const decoded = buf.toString("utf8");
return {
type: "serial_event",
timestamp: (processStartTime || Date.now()) + ts,
data: decoded,
};
} catch (e) {
logger.warn(
`Failed to parse SERIAL_EVENT: ${e instanceof Error ? e.message : String(e)}`,
);
return null;
}
}
/**
* Parse I/O registry pin definition
* Format: [[IO_PIN:pin:defined:line:pinMode:operations]]
*
* @param match - Regex match array from registryPin pattern
* @returns IOPinRecord or null on error
*/
private parseRegistryPin(match: RegExpMatchArray): IOPinRecord | null {
try {
const pin = match[1];
const defined = match[2] === "1";
const definedLine = parseInt(match[3]);
const pinModeParsed = parseInt(match[4]);
const operationsStr = match[5];
const usedAt: Array<{ line: number; operation: string }> = [];
if (operationsStr) {
// Parse operations: "pinMode:1@0:digitalWrite@5" -> extract operation@line pairs
const opMatches = operationsStr.match(/([^:@]+(?::\d+)?@\d+)/g);
Eif (opMatches) {
opMatches.forEach((opMatch) => {
Eif (opMatch && !opMatch.startsWith("_count")) {
// Skip metadata like _count
const atIndex = opMatch.lastIndexOf("@");
Eif (atIndex > 0) {
const operation = opMatch.substring(0, atIndex);
const lineStr = opMatch.substring(atIndex + 1);
usedAt.push({
line: parseInt(lineStr) || 0,
operation,
});
}
}
});
}
}
return {
pin,
defined,
pinMode: pinModeParsed,
definedAt: defined ? { line: definedLine } : undefined,
usedAt,
};
} catch (e) {
logger.warn(
`Failed to parse registry pin: ${e instanceof Error ? e.message : String(e)}`,
);
return null;
}
}
}
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