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

Techincal Indicators written in javascript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.DEFAULT_GRAVESTONE_DOJI_CONFIG = void 0;
exports.gravestonedoji = gravestonedoji;
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 GraveStoneDoji pattern.
 * Includes thresholds for upper shadow analysis.
 */

/**
 * Default configuration for GraveStoneDoji pattern.
 */
const DEFAULT_GRAVESTONE_DOJI_CONFIG = exports.DEFAULT_GRAVESTONE_DOJI_CONFIG = {
  ..._CandlestickFinder.DEFAULT_CANDLESTICK_CONFIG,
  minAbsoluteUpperShadowThreshold: 0.04
};
class GraveStoneDoji extends _CandlestickFinder.default {
  minAbsoluteUpperShadowThreshold;
  constructor(config) {
    const finalConfig = {
      ...DEFAULT_GRAVESTONE_DOJI_CONFIG,
      ...config
    };
    super(finalConfig);
    this.requiredCount = 1;
    this.name = 'GraveStoneDoji';

    // Apply configuration with defaults
    this.minAbsoluteUpperShadowThreshold = finalConfig.minAbsoluteUpperShadowThreshold;
  }
  logic(data) {
    // For single candle patterns, we need the last (most recent) candle
    // Since data is in ascending order, the last candle is at the last index
    let lastIndex = data.open.length - 1;
    let daysOpen = data.open[lastIndex];
    let daysClose = data.close[lastIndex];
    let daysHigh = data.high[lastIndex];
    let daysLow = data.low[lastIndex];

    // Basic validation - ensure we have valid numbers and high >= low
    if (!isFinite(daysOpen) || !isFinite(daysHigh) || !isFinite(daysLow) || !isFinite(daysClose)) {
      return false;
    }
    if (daysHigh < daysLow) {
      return false;
    }

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

    // Avoid division by zero
    if (totalRange <= 0) {
      return false;
    }

    // GraveStone Doji criteria:
    // 1. Small body (open ≈ close) - doji characteristic
    // 2. Open and close should be near the low (at the bottom of the range)
    // 3. Long upper shadow - should dominate the candle
    // 4. Lower shadow should be small relative to upper shadow
    // 5. Upper shadow must be meaningful (not just noise)

    // Check if it's a doji (small body)
    // Note: approximateEqual now uses fixed thresholds instead of scale
    let isSmallBody = this.approximateEqual(daysOpen, daysClose);

    // Check if open/close are near the low (within 20% of total range from low)
    let openDistanceFromLow = Math.abs(daysOpen - daysLow);
    let closeDistanceFromLow = Math.abs(daysClose - daysLow);
    let maxDistanceFromLow = Math.max(openDistanceFromLow, closeDistanceFromLow);
    let isNearLow = maxDistanceFromLow <= totalRange * 0.2;

    // Upper shadow should be significant - at least 60% of total range
    let hasSignificantUpperShadow = upperShadow >= totalRange * 0.6;

    // Upper shadow must be meaningful - at least 2x the body size or a minimum threshold
    // Use direct threshold calculation instead of utility function
    let minUpperShadowThreshold = Math.max(bodySize * 2, totalRange * 0.1);
    let minAbsoluteThreshold = this.minAbsoluteUpperShadowThreshold;
    let hasMeaningfulUpperShadow = upperShadow >= minUpperShadowThreshold && upperShadow >= minAbsoluteThreshold;

    // Lower shadow should be minimal - less than 20% of total range
    // Handle negative lower shadow (when low is between open and close)
    let effectiveLowerShadow = Math.max(0, lowerShadow);
    let hasMinimalLowerShadow = effectiveLowerShadow <= totalRange * 0.2;

    // Body should be small relative to total range - less than 15% of total range
    let hasSmallBodyRelativeToRange = bodySize <= totalRange * 0.15;
    return isSmallBody && isNearLow && hasSignificantUpperShadow && hasMeaningfulUpperShadow && hasMinimalLowerShadow && hasSmallBodyRelativeToRange;
  }
}
exports.default = GraveStoneDoji;
function gravestonedoji(data, config = DEFAULT_GRAVESTONE_DOJI_CONFIG) {
  return new GraveStoneDoji(config).hasPattern(data);
}
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