Code Quality Analysis - Quant ShastrAI

Technical Audit: Intraday BUY/SELL & AUTO SL¶

This audit provides a deep-dive technical analysis of the provided Pine Script code, evaluating its architecture, syntax, logic, and maintainability against modern v5/v6 standards.

1. Architectural Efficiency & Optimization¶

The script’s architecture is centered around managing state (active trades, stop-loss lines, labels) using a series of parallel var arrays. While this is a functional approach for persistence, it introduces significant performance challenges.

Computational Footprint: The script’s primary performance bottleneck lies in its main execution block, specifically the two for loops responsible for detecting stop-loss hits and repositioning labels.
```
// Loop 1: Detect SL hits
for i = 0 to array.size(slLines) - 1 by 1
    if array.get(slActive, i)
        // ... logic ...

// Loop 2: Move SL labels
for i = 0 to array.size(slLines) - 1 by 1
    if array.get(slActive, i)
        label.set_xy(...)
```
These loops iterate on every bar over the entire history of trades generated within the current session. If a user has 10 signals in a day, by the end of the day, these loops will execute 10 times on every new bar tick, leading to a linear increase in computation. This will cause noticeable script lag (“Calculation-Heavy” warnings), especially on active trading days or if the script is left running for a long time. The label-moving loop is particularly inefficient, as it calls a drawing modification function (label.set_xy) for every active trade on every single bar.
Redundant Calculations: The logic to determine the 3-bar block (blockStartMs, idxInBlk) is calculated on every bar. While not a major performance drain, it’s work that is only relevant when blockComplete is true. The core logic is otherwise efficient, using simple comparisons.
Use of Built-in Functions: The script effectively uses built-in functions like math.min, math.max, and ta.change. There are no obvious cases of manual, resource-intensive workarounds for existing functions. max_bars_back is implicitly low (2 bars), which is excellent for performance.

2. Modern Standards & Syntax Audit¶

The script is written in @version=6, the latest available at the time of this audit. This is commendable and demonstrates an awareness of the Pine Script ecosystem’s evolution.

Legacy Check: Not applicable. The script is fully modern and uses v6 syntax correctly (e.g., input.bool, array.new<type>(), color.green, str.tostring).
Advanced Features (Missed Opportunities):
- User-Defined Types (UDTs): This is the single biggest missed opportunity. The script employs eight parallel arrays to manage the state of a single trade entity: slLines, slLevels, slIsBuy, slActive, slStartBars, sigLabels, slStopLbls, slHitLbls. This is a classic anti-pattern that UDTs were designed to solve. The entire state could be consolidated into a single type and array:
```
// Proposed UDT Structure
type Trade
    line slLine
    label slStopLabel
    float slLevel
    bool isBuy
    bool isActive
    int startBar

var array<Trade> trades = array.new<Trade>()
```
  Adopting a UDT would dramatically improve code organization, reduce the chance of bugs (e.g., arrays getting out of sync), and make the code vastly more maintainable.
- Methods: By using a UDT, the logic for checking a stop-loss hit or updating a drawing could be encapsulated into a method on the Trade type, further cleaning up the global scope. For example: method checkHit(Trade t, float currentPrice).

3. Logic Integrity & Reliability¶

The script’s core logic is well-constructed and avoids common pitfalls.

Repainting & Future Leaks: The script is 100% free of repainting.
- The signal logic (buySignal, sellSignal) is based on historical data (close[2], high[2], etc.) and the close of the current bar.
- The blockComplete condition ensures that signals are only triggered on the definitive close of the third bar in a 15-minute sequence.
- The script does not use request.security() and therefore has no risk of lookahead bias. This is a critical success for a signal-generating script.
Calculation Stability:
- The script contains no division operations, eliminating the risk of division-by-zero errors.
- na values are handled implicitly and safely, as the logic relies on standard OHLC values which are rarely na mid-chart.
- The hardcoded check for the 5-minute timeframe (is5min = timeframe.period == '5') is a robust way to enforce the script’s intended use case. It fails safely (by producing no signals) if run on an incorrect timeframe.

4. Readability & Maintainability¶

The script’s readability is mixed, suffering primarily from its architectural choices.

Naming Conventions: Variable names like c0g, c1r, c2r are overly cryptic and harm readability. More descriptive names such as isBar2Green, isBar1Red, isBar0Red would be self-documenting. Other variable names like slActive and showSLLines are clear and effective.
Code Structure & Duplication:
- The session reset block is highly repetitive. The loops for deleting drawings and clearing arrays could be consolidated into a helper function to reduce verbosity.
- The code blocks for if buySignal and if sellSignal are nearly identical. This logic could be refactored into a single function that accepts parameters for direction (buy/sell) and stop-loss level, eliminating significant code duplication.
- As mentioned in Pillar 2, the use of eight parallel arrays is the primary source of technical debt, making the code difficult to read, debug, and extend.
Documentation: Comments are used sparingly but effectively to segment the code into logical blocks (=== Inputs ===, === Persistent storage ===). The input titles are clear and user-friendly.

Audit Verdict¶

Code Quality Grade: C+

This grade reflects a script that is functionally correct and logically sound but suffers from significant architectural and performance issues that create technical debt.

Greatest Technical Achievement: Logical Integrity. The script’s greatest strength is that its signals are stable and do not repaint. The author has successfully created a reliable, non-cheating signal generation mechanism, which is the most critical requirement for any trading indicator.
Most Significant Technical Debt: Architectural Inefficiency. The decision to use multiple parallel arrays instead of a single array of a User-Defined Type (UDT) is a major architectural flaw. This choice directly leads to poor performance (via loops that run on every bar) and severely impacts maintainability. Refactoring this into a UDT-based structure would resolve the majority of the script’s issues, elevating it to a much higher standard of quality.