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

Techincal Indicators written in javascript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.DEFAULT_PIERCING_LINE_CONFIG = void 0;
exports.piercingline = piercingline;
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 PiercingLine pattern.
 * Only requires scale parameter since this pattern uses direct price comparisons.
 */

/**
 * Default configuration for PiercingLine pattern.
 */
const DEFAULT_PIERCING_LINE_CONFIG = exports.DEFAULT_PIERCING_LINE_CONFIG = {
  ..._CandlestickFinder.DEFAULT_CANDLESTICK_CONFIG
};
class PiercingLine extends _CandlestickFinder.default {
  constructor(config) {
    const finalConfig = {
      ...DEFAULT_PIERCING_LINE_CONFIG,
      ...config
    };
    super(finalConfig);
    this.requiredCount = 2;
    this.name = 'PiercingLine';
  }
  logic(data) {
    // Previous day (older) - index 0
    let prevOpen = data.open[0];
    let prevClose = data.close[0];
    let prevHigh = data.high[0];
    let prevLow = data.low[0];

    // Current day (most recent) - index 1
    let currOpen = data.open[1];
    let currClose = data.close[1];
    let currHigh = data.high[1];
    let currLow = data.low[1];

    // Validate OHLC data integrity for both days
    if (!this.validateOHLC(prevOpen, prevHigh, prevLow, prevClose) || !this.validateOHLC(currOpen, currHigh, currLow, currClose)) {
      return false;
    }

    // Previous day should be bearish (red candle)
    let prevIsBearish = prevClose < prevOpen;

    // Current day should be bullish (green candle)
    let currIsBullish = currClose > currOpen;

    // Calculate the midpoint of previous day's body (no scale dependency)
    let prevMidpoint = (prevOpen + prevClose) / 2;

    // Piercing line conditions (all use direct price comparisons):
    // 1. Current opens below previous day's low (gap down)
    // 2. Current close is above the midpoint of previous day's body
    let isPiercingLine = currOpen < prevLow && currClose > prevMidpoint;

    // Additional check: ensure current close is still below previous open (not full engulfment)
    let isPartialPenetration = currClose < prevOpen;
    return prevIsBearish && currIsBullish && isPiercingLine && isPartialPenetration;
  }
}

/**
 * Detects PiercingLine candlestick pattern.
 *
 * A PiercingLine is a bullish reversal pattern that occurs at the end of a downtrend.
 * It consists of a bearish candle followed by a bullish candle that opens below the
 * previous day's low but closes above the midpoint of the previous day's body.
 *
 * @param data - Stock data containing OHLC values
 * @param config - Configuration options for the pattern detection
 * @returns True if PiercingLine pattern is detected, false otherwise
 *
 * @example
 * ```typescript
 * const data = { open: [...], high: [...], low: [...], close: [...] };
 * const isPattern = piercingline(data, { scale: 0.001 });
 * ```
 */
exports.default = PiercingLine;
function piercingline(data, config = DEFAULT_PIERCING_LINE_CONFIG) {
  return new PiercingLine(config).hasPattern(data);
}
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