json-tools-rs 0.9.2

A high-performance Rust library for advanced JSON manipulation with SIMD-accelerated parsing, Rayon parallelism, and Python bindings with DataFrame/Series support
Documentation 
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use std::collections::HashMap;
use std::hash::{BuildHasher, Hasher};

const K: u64 = 0x517cc1b727220a95;

pub(crate) struct FxHasher(u64);

impl Default for FxHasher {
    #[inline]
    fn default() -> Self {
        FxHasher(0)
    }
}

impl Hasher for FxHasher {
    #[inline]
    fn write(&mut self, bytes: &[u8]) {
        for &b in bytes {
            self.0 = (self.0.rotate_left(5) ^ b as u64).wrapping_mul(K);
        }
    }

    #[inline]
    fn write_u8(&mut self, i: u8) {
        self.0 = (self.0.rotate_left(5) ^ i as u64).wrapping_mul(K);
    }

    #[inline]
    fn write_u32(&mut self, i: u32) {
        self.0 = (self.0.rotate_left(5) ^ i as u64).wrapping_mul(K);
    }

    #[inline]
    fn write_u64(&mut self, i: u64) {
        self.0 = (self.0.rotate_left(5) ^ i).wrapping_mul(K);
    }

    #[inline]
    fn write_usize(&mut self, i: usize) {
        self.0 = (self.0.rotate_left(5) ^ i as u64).wrapping_mul(K);
    }

    #[inline]
    fn finish(&self) -> u64 {
        self.0
    }
}

#[derive(Clone, Default)]
pub(crate) struct FxBuildHasher;

impl BuildHasher for FxBuildHasher {
    type Hasher = FxHasher;

    #[inline]
    fn build_hasher(&self) -> FxHasher {
        FxHasher::default()
    }
}

pub(crate) type FxHashMap<K, V> = HashMap<K, V, FxBuildHasher>;
pub(crate) type FxIndexMap<K, V> = indexmap::IndexMap<K, V, FxBuildHasher>;