@thuantan2060/technicalindicators/lib/candlestick/DragonFlyDoji.js

Techincal Indicators written in javascript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.DEFAULT_DRAGONFLY_DOJI_CONFIG = void 0;
exports.dragonflydoji = dragonflydoji;
var _CandlestickFinder = _interopRequireWildcard(require("./CandlestickFinder"));
function _interopRequireWildcard(e, t) { if ("function" == typeof WeakMap) var r = new WeakMap(), n = new WeakMap(); return (_interopRequireWildcard = function (e, t) { if (!t && e && e.__esModule) return e; var o, i, f = { __proto__: null, default: e }; if (null === e || "object" != typeof e && "function" != typeof e) return f; if (o = t ? n : r) { if (o.has(e)) return o.get(e); o.set(e, f); } for (const t in e) "default" !== t && {}.hasOwnProperty.call(e, t) && ((i = (o = Object.defineProperty) && Object.getOwnPropertyDescriptor(e, t)) && (i.get || i.set) ? o(f, t, i) : f[t] = e[t]); return f; })(e, t); }
/**
 * Configuration interface for DragonFlyDoji pattern.
 * Only requires scale parameter since this pattern uses approximateEqual for body tolerance.
 */

/**
 * Default configuration for DragonFlyDoji pattern.
 */
const DEFAULT_DRAGONFLY_DOJI_CONFIG = exports.DEFAULT_DRAGONFLY_DOJI_CONFIG = {
  ..._CandlestickFinder.DEFAULT_CANDLESTICK_CONFIG
};
class DragonFlyDoji extends _CandlestickFinder.default {
  constructor(config) {
    const finalConfig = {
      ...DEFAULT_DRAGONFLY_DOJI_CONFIG,
      ...config
    };
    super(finalConfig);
    this.requiredCount = 1;
    this.name = 'DragonFlyDoji';
  }
  logic(data) {
    let daysOpen = data.open[0];
    let daysClose = data.close[0];
    let daysHigh = data.high[0];
    let daysLow = data.low[0];

    // Basic validation - check for NaN or infinite values and basic OHLC constraints
    if (!isFinite(daysOpen) || !isFinite(daysHigh) || !isFinite(daysLow) || !isFinite(daysClose)) {
      return false;
    }

    // Check basic OHLC constraints (works correctly for both positive and negative prices)
    if (daysHigh < Math.max(daysOpen, daysClose) || daysLow > Math.min(daysOpen, daysClose)) {
      return false;
    }

    // DragonFly Doji: Open ≈ Close, and both are near the High, with a long lower shadow
    // Note: approximateEqual now uses fixed thresholds instead of scale
    let isOpenEqualsClose = this.approximateEqual(daysOpen, daysClose);

    // Calculate shadows and body
    let bodySize = Math.abs(daysClose - daysOpen);
    let lowerShadow = Math.min(daysOpen, daysClose) - daysLow;
    let upperShadow = daysHigh - Math.max(daysOpen, daysClose);
    let totalRange = daysHigh - daysLow;

    // For DragonFly Doji, the open/close should be near the high
    // Check if both open and close are individually close to high (more flexible approach)
    let isOpenNearHigh = this.approximateEqual(daysOpen, daysHigh);
    let isCloseNearHigh = this.approximateEqual(daysClose, daysHigh);
    let isBodyNearHigh = isOpenNearHigh || isCloseNearHigh;

    // DragonFly Doji criteria:
    // 1. Open ≈ Close (small body)
    // 2. Open or Close near the High (body at the top)
    // 3. Long lower shadow (at least 2x the body size or 60% of total range)
    // 4. Minimal upper shadow (less than 10% of total range)
    let hasSmallBody = isOpenEqualsClose;
    let hasBodyAtTop = isBodyNearHigh;
    let hasLongLowerShadow = lowerShadow >= Math.max(bodySize * 2, totalRange * 0.6);
    let hasMinimalUpperShadow = upperShadow <= totalRange * 0.1;
    return hasSmallBody && hasBodyAtTop && hasLongLowerShadow && hasMinimalUpperShadow && totalRange > 0;
  }
}
exports.default = DragonFlyDoji;
function dragonflydoji(data, config = DEFAULT_DRAGONFLY_DOJI_CONFIG) {
  return new DragonFlyDoji(config).hasPattern(data);
}
//# sourceMappingURL=DragonFlyDoji.js.map