js-precision/js_precision_bg.js

一个基于 Rust + WebAssembly 的高精度计算库，封装了 [`rust_decimal`](https://crates.io/crates/rust_decimal) 实现，支持链式调用、科学计数法和精度控制，适用于前端金融、加密等高精度场景。

let wasm;
export function __wbg_set_wasm(val) {
    wasm = val;
}


const lTextDecoder = typeof TextDecoder === 'undefined' ? (0, module.require)('util').TextDecoder : TextDecoder;

let cachedTextDecoder = new lTextDecoder('utf-8', { ignoreBOM: true, fatal: true });

cachedTextDecoder.decode();

let cachedUint8ArrayMemory0 = null;

function getUint8ArrayMemory0() {
    if (cachedUint8ArrayMemory0 === null || cachedUint8ArrayMemory0.byteLength === 0) {
        cachedUint8ArrayMemory0 = new Uint8Array(wasm.memory.buffer);
    }
    return cachedUint8ArrayMemory0;
}

function getStringFromWasm0(ptr, len) {
    ptr = ptr >>> 0;
    return cachedTextDecoder.decode(getUint8ArrayMemory0().subarray(ptr, ptr + len));
}

let WASM_VECTOR_LEN = 0;

const lTextEncoder = typeof TextEncoder === 'undefined' ? (0, module.require)('util').TextEncoder : TextEncoder;

let cachedTextEncoder = new lTextEncoder('utf-8');

const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
    ? function (arg, view) {
    return cachedTextEncoder.encodeInto(arg, view);
}
    : function (arg, view) {
    const buf = cachedTextEncoder.encode(arg);
    view.set(buf);
    return {
        read: arg.length,
        written: buf.length
    };
});

function passStringToWasm0(arg, malloc, realloc) {

    if (realloc === undefined) {
        const buf = cachedTextEncoder.encode(arg);
        const ptr = malloc(buf.length, 1) >>> 0;
        getUint8ArrayMemory0().subarray(ptr, ptr + buf.length).set(buf);
        WASM_VECTOR_LEN = buf.length;
        return ptr;
    }

    let len = arg.length;
    let ptr = malloc(len, 1) >>> 0;

    const mem = getUint8ArrayMemory0();

    let offset = 0;

    for (; offset < len; offset++) {
        const code = arg.charCodeAt(offset);
        if (code > 0x7F) break;
        mem[ptr + offset] = code;
    }

    if (offset !== len) {
        if (offset !== 0) {
            arg = arg.slice(offset);
        }
        ptr = realloc(ptr, len, len = offset + arg.length * 3, 1) >>> 0;
        const view = getUint8ArrayMemory0().subarray(ptr + offset, ptr + len);
        const ret = encodeString(arg, view);

        offset += ret.written;
        ptr = realloc(ptr, len, offset, 1) >>> 0;
    }

    WASM_VECTOR_LEN = offset;
    return ptr;
}

function isLikeNone(x) {
    return x === undefined || x === null;
}

const PreciseFinalization = (typeof FinalizationRegistry === 'undefined')
    ? { register: () => {}, unregister: () => {} }
    : new FinalizationRegistry(ptr => wasm.__wbg_precise_free(ptr >>> 0, 1));

export class Precise {

    static __wrap(ptr) {
        ptr = ptr >>> 0;
        const obj = Object.create(Precise.prototype);
        obj.__wbg_ptr = ptr;
        PreciseFinalization.register(obj, obj.__wbg_ptr, obj);
        return obj;
    }

    __destroy_into_raw() {
        const ptr = this.__wbg_ptr;
        this.__wbg_ptr = 0;
        PreciseFinalization.unregister(this);
        return ptr;
    }

    free() {
        const ptr = this.__destroy_into_raw();
        wasm.__wbg_precise_free(ptr, 0);
    }
    /**
     * @param {string} input
     */
    constructor(input) {
        const ptr0 = passStringToWasm0(input, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        const len0 = WASM_VECTOR_LEN;
        const ret = wasm.precise_new(ptr0, len0);
        this.__wbg_ptr = ret >>> 0;
        PreciseFinalization.register(this, this.__wbg_ptr, this);
        return this;
    }
    /**
     * @param {number} n
     * @returns {Precise}
     */
    static fromNumber(n) {
        const ret = wasm.precise_fromNumber(n);
        return Precise.__wrap(ret);
    }
    /**
     * @param {number} dp
     * @returns {Precise}
     */
    with_precision(dp) {
        const ret = wasm.precise_with_precision(this.__wbg_ptr, dp);
        return Precise.__wrap(ret);
    }
    /**
     * @param {string} other
     * @returns {Precise}
     */
    add(other) {
        const ptr0 = passStringToWasm0(other, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        const len0 = WASM_VECTOR_LEN;
        const ret = wasm.precise_add(this.__wbg_ptr, ptr0, len0);
        return Precise.__wrap(ret);
    }
    /**
     * @param {string} other
     * @returns {Precise}
     */
    sub(other) {
        const ptr0 = passStringToWasm0(other, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        const len0 = WASM_VECTOR_LEN;
        const ret = wasm.precise_sub(this.__wbg_ptr, ptr0, len0);
        return Precise.__wrap(ret);
    }
    /**
     * @param {string} other
     * @returns {Precise}
     */
    mul(other) {
        const ptr0 = passStringToWasm0(other, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        const len0 = WASM_VECTOR_LEN;
        const ret = wasm.precise_mul(this.__wbg_ptr, ptr0, len0);
        return Precise.__wrap(ret);
    }
    /**
     * @param {string} other
     * @returns {Precise}
     */
    div(other) {
        const ptr0 = passStringToWasm0(other, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        const len0 = WASM_VECTOR_LEN;
        const ret = wasm.precise_div(this.__wbg_ptr, ptr0, len0);
        return Precise.__wrap(ret);
    }
    /**
     * @param {number | null} [digits]
     * @returns {string}
     */
    to_fixed(digits) {
        let deferred1_0;
        let deferred1_1;
        try {
            const ret = wasm.precise_to_fixed(this.__wbg_ptr, isLikeNone(digits) ? 0x100000001 : (digits) >>> 0);
            deferred1_0 = ret[0];
            deferred1_1 = ret[1];
            return getStringFromWasm0(ret[0], ret[1]);
        } finally {
            wasm.__wbindgen_free(deferred1_0, deferred1_1, 1);
        }
    }
    /**
     * @returns {number}
     */
    to_number() {
        const ret = wasm.precise_to_number(this.__wbg_ptr);
        return ret;
    }
}

export function __wbindgen_init_externref_table() {
    const table = wasm.__wbindgen_export_0;
    const offset = table.grow(4);
    table.set(0, undefined);
    table.set(offset + 0, undefined);
    table.set(offset + 1, null);
    table.set(offset + 2, true);
    table.set(offset + 3, false);
    ;
};

export function __wbindgen_throw(arg0, arg1) {
    throw new Error(getStringFromWasm0(arg0, arg1));
};