Struct Tweezer 

pub struct Tweezer { /* private fields */ }

Tweezer — a 2-bar reversal pattern where two consecutive candles share an extreme.

tol           = tolerance * |prev.high| + tolerance * |prev.low|   (per leg)
tweezer_top   = |curr.high − prev.high| <= tol_high
tweezer_bot   = |curr.low  − prev.low|  <= tol_low

The output is −1.0 for a Tweezer Top (matched highs), +1.0 for a Tweezer Bottom (matched lows), and 0.0 otherwise. If both extremes match — a flat pair of candles — the bottom wins by convention (bullish rejection of the low). tolerance defaults to 0.001 (10 bps relative) and must lie in [0, 1).

Pattern-shape check only — no trend filter is applied; combine with a trend indicator for actionable signals.

Signed ±1 encoding

This detector already emits the uniform candlestick sign convention shared across the pattern family — +1.0 bullish, −1.0 bearish, 0.0 no pattern — so it drops straight into a machine-learning feature matrix where the bullish and bearish variants of the pattern occupy a single dimension.

Example

use wickra_core::{Candle, Indicator, Tweezer};

let mut indicator = Tweezer::new();
indicator.update(Candle::new(11.0, 12.0, 9.5, 9.6, 1.0, 0).unwrap());
// Matching low.
let out = indicator.update(Candle::new(9.7, 10.5, 9.5, 10.2, 1.0, 1).unwrap());
assert_eq!(out, Some(1.0));

Implementations

impl Tweezer

pub const fn new() -> Self

Construct a Tweezer detector with the default relative tolerance (1e-3).

pub fn with_tolerance(tolerance: f64) -> Result<Self>

Construct a Tweezer detector with a custom relative tolerance.

tolerance must lie in [0, 1).

pub fn tolerance(&self) -> f64

Configured relative tolerance.

Trait Implementations

impl Clone for Tweezer

fn clone(&self) -> Tweezer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Tweezer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Tweezer

fn default() -> Self

Returns the “default value” for a type.

impl Indicator for Tweezer

type Input = Candle

Type of one input data point (typically f64 for a price, or Candle / Tick).

type Output = f64

Type of one output value.

fn update(&mut self, candle: Candle) -> Option<f64>

Feed one new data point into the indicator and return the freshly computed output, or None if the indicator is still warming up.

fn reset(&mut self)

Reset all internal state, leaving the indicator equivalent to a freshly constructed instance with the same parameters.

fn warmup_period(&self) -> usize

Number of inputs required before the first non-None output can be produced.

fn is_ready(&self) -> bool

Whether the indicator has emitted at least one value since the last reset.

fn name(&self) -> &'static str

Stable, human-readable indicator name. Used by chaining and diagnostics.