🦊 Haven Programming Language (ODCS Native Edition) - VS Code Extension

Guarded by Haven Fox · Sovereign Digital Continuity · Zero Intent Loss

Official Visual Studio Code extension for the Haven Programming Language (.hvn, .haven) and the Open Digital Continuity Standard (ODCS) / Open Financial Continuity Standard (OFCS).

Standard Architecture & Specification by Anirudha Puthraya.
Maintained by the Haven Language Foundation.

🦊 The Haven Fox Mascot

Meet Haven Fox — the official celestial guardian of Haven Language:

• Agility & Disruption Tolerance: Swift, resilient execution that effortlessly bridges online and airgap offline modes.
• Cryptographic Vigilance: Guarding append-only Merkle ledgers and ensuring Zero Intent Loss (sub-16ms receipt minting).
• Mathematical Exactness: Enforcing Invariant 1 (Debits == Credits) with zero floating-point drift.

Features

• 🦊 Haven Fox Branding: High-resolution icons, mascot theme, and status-bar indicator.
• 🌈 Syntax Highlighting: Full grammar definitions for Haven natural English keywords, ODCS durable constructs, OFCS monetary records, pipeline operators (|>), and enterprise annotations.
• ⚡ Dynamic Autocomplete & Type Suggestions: Context-aware completion items for all keywords, classes, methods, and decorators.
• 🏷️ Intelligent Type Suggestions: Context-driven type hints triggered upon typing :, ->, or [ for Primitives, Generics, ODCS Merkle types, OFCS Money, and Java Concurrency types.
• 📝 Intelligent Signature Help: Instant parameter tooltips and 59+ type contracts triggered upon typing (.
• 📐 Keyword Uses & Hover Docs: Comprehensive markdown documentation tooltips for every keyword.
• 🧪 1-Click Test Runner & Microservice Launcher: Run tests (haven.test) and launch backend microservices directly from the editor.
• 🛡️ ODCS Invariant Security: Native highlighting for @Transactional, @Audit, checkpoint, preserve, and durable record.

🏷️ Type Suggestions & Static Verification

Haven Language extension provides full context-aware type hints that appear at the top of the autocompletion menu when typing colons (:), return arrows (->), generic brackets ([), or defining fields inside durable record:

durable record PatientVitals:
    patient_id: str
    heart_rate: int
    blood_pressure: str
    recorded_at: int
    is_critical: bool

define transfer_funds(
    sender: FinancialAccount,
    recipient: FinancialAccount,
    amount: Money
) -> DoubleEntryRecord:
    ensure amount.is_positive() otherwise "Invalid transfer amount"
    give back DoubleEntryRecord(
        tx_id=uuid7(),
        debits=[amount],
        credits=[amount],
        description="P2P Transfer"
    )

Type Suggestions Matrix

Keyword Uses & Reference

1. Variables & State Mutability

2. Conditionals & Control Flow

3. Loops & Iteration

4. Functions & Pipeline

5. Error Recovery

6. ODCS Continuity & Immutability

Enterprise Backend Microservices

Haven includes a high-performance, multi-threaded microservice framework:

from haven import HavenApp, Request, Response

app = HavenApp(name="PaymentGateway", port=8080, cors=True, continuity_audit=True)

@app.get("/api/v1/health")
def health(req: Request) -> Response:
    return Response.ok("Payment Gateway is healthy")

@app.get("/api/v1/accounts/{account_id}/balance")
def get_balance(req: Request) -> Response:
    account_id = req.path_params.get("account_id")
    return Response.json({"account": account_id, "status": "ACTIVE"})

@app.post("/api/v1/orders")
def create_order(req: Request) -> Response:
    order_data = req.json
    return Response.json({"order_id": "ORD-101", "data": order_data}, status_code=201)

if __name__ == "__main__":
    app.run(blocking=True)

Pre-Built ODCS & OFCS REST Endpoints

Every Haven server automatically provides cryptographic audit endpoints:

• GET /odcs/health - Ledger height, head hash, and integrity verification.
• GET /odcs/ledger/blocks?limit=20 - Paginated tamper-evident blocks.
• GET /ofcs/accounts - Registered double-entry financial accounts and exact decimal balances.

Open Financial Continuity Standard (OFCS)

Eliminates IEEE-754 floating-point drift and enforces double-entry balance:

from ofcs import DoubleEntryRecord, Money, USD, OFCSFinancialLedger

ledger = OFCSFinancialLedger(ledger_name="vault")
acc_source = ledger.create_account("ACC-101", USD, initial_balance="1000.00")
acc_dest = ledger.create_account("ACC-102", USD, initial_balance="0.00")

# Invariant 1: Sum(Debits) MUST EQUAL Sum(Credits)
tx = DoubleEntryRecord(
    tx_id="TX-5001",
    debits=[Money("250.00", USD)],
    credits=[Money("250.00", USD)],
    description="Transfer"
)
entry = ledger.post_transaction(tx)

Enterprise Concurrency & Annotations

• CompletableFuture: Reactive non-blocking concurrency:

  from haven import CompletableFuture
  
  CompletableFuture.supply_async(lambda: fetch_market_rate()) \
      .then_apply(lambda rate: compute_tax(rate)) \
      .then_accept(lambda final_val: print("Settled:", final_val))
  

• Circuit Breaker: Microservice cascade outage prevention:

  @CircuitBreaker(failure_threshold=5, recovery_timeout=30.0)
  def call_partner_api(payload):
      ...
  

• Transactional Boundary:

  @Transactional(rollback_on=(Exception,), audit=True)
  def execute_atomic_settlement():
      ...
  

Official Links

• Repository: https://github.com/Veyra-Programming/haven-Language-
• ODCS Global Gateway: https://api.odcs.in
• Architecture & Standard: Anirudha Puthraya