fast-excel-to-json/excel_to_json.js

This library provides functions for converting Excel files into JSON objects, with an automatic conversion of Excel date formats into Unix timestamps by default. The library is optimized for performance by processing Excel rows in parallel, resulting in s

let imports = {};
imports['__wbindgen_placeholder__'] = module.exports;
let wasm;
const { TextDecoder, TextEncoder } = require(`util`);

const heap = new Array(128).fill(undefined);

heap.push(undefined, null, true, false);

function getObject(idx) { return heap[idx]; }

let heap_next = heap.length;

function dropObject(idx) {
    if (idx < 132) return;
    heap[idx] = heap_next;
    heap_next = idx;
}

function takeObject(idx) {
    const ret = getObject(idx);
    dropObject(idx);
    return ret;
}

function addHeapObject(obj) {
    if (heap_next === heap.length) heap.push(heap.length + 1);
    const idx = heap_next;
    heap_next = heap[idx];

    heap[idx] = obj;
    return idx;
}

let cachedTextDecoder = new TextDecoder('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));
}

function debugString(val) {
    // primitive types
    const type = typeof val;
    if (type == 'number' || type == 'boolean' || val == null) {
        return  `${val}`;
    }
    if (type == 'string') {
        return `"${val}"`;
    }
    if (type == 'symbol') {
        const description = val.description;
        if (description == null) {
            return 'Symbol';
        } else {
            return `Symbol(${description})`;
        }
    }
    if (type == 'function') {
        const name = val.name;
        if (typeof name == 'string' && name.length > 0) {
            return `Function(${name})`;
        } else {
            return 'Function';
        }
    }
    // objects
    if (Array.isArray(val)) {
        const length = val.length;
        let debug = '[';
        if (length > 0) {
            debug += debugString(val[0]);
        }
        for(let i = 1; i < length; i++) {
            debug += ', ' + debugString(val[i]);
        }
        debug += ']';
        return debug;
    }
    // Test for built-in
    const builtInMatches = /\[object ([^\]]+)\]/.exec(toString.call(val));
    let className;
    if (builtInMatches.length > 1) {
        className = builtInMatches[1];
    } else {
        // Failed to match the standard '[object ClassName]'
        return toString.call(val);
    }
    if (className == 'Object') {
        // we're a user defined class or Object
        // JSON.stringify avoids problems with cycles, and is generally much
        // easier than looping through ownProperties of `val`.
        try {
            return 'Object(' + JSON.stringify(val) + ')';
        } catch (_) {
            return 'Object';
        }
    }
    // errors
    if (val instanceof Error) {
        return `${val.name}: ${val.message}\n${val.stack}`;
    }
    // TODO we could test for more things here, like `Set`s and `Map`s.
    return className;
}

let WASM_VECTOR_LEN = 0;

let cachedTextEncoder = new TextEncoder('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;
}

let cachedDataViewMemory0 = null;

function getDataViewMemory0() {
    if (cachedDataViewMemory0 === null || cachedDataViewMemory0.buffer.detached === true || (cachedDataViewMemory0.buffer.detached === undefined && cachedDataViewMemory0.buffer !== wasm.memory.buffer)) {
        cachedDataViewMemory0 = new DataView(wasm.memory.buffer);
    }
    return cachedDataViewMemory0;
}

function passArray8ToWasm0(arg, malloc) {
    const ptr = malloc(arg.length * 1, 1) >>> 0;
    getUint8ArrayMemory0().set(arg, ptr / 1);
    WASM_VECTOR_LEN = arg.length;
    return ptr;
}

function getArrayJsValueFromWasm0(ptr, len) {
    ptr = ptr >>> 0;
    const mem = getDataViewMemory0();
    const result = [];
    for (let i = ptr; i < ptr + 4 * len; i += 4) {
        result.push(takeObject(mem.getUint32(i, true)));
    }
    return result;
}
/**
* @param {Uint8Array} excel_data
* @param {number} sheet_index
* @param {boolean} is_iso8601
* @returns {(object)[]}
*/
module.exports.excel_to_json = function(excel_data, sheet_index, is_iso8601) {
    try {
        const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
        const ptr0 = passArray8ToWasm0(excel_data, wasm.__wbindgen_malloc);
        const len0 = WASM_VECTOR_LEN;
        wasm.excel_to_json(retptr, ptr0, len0, sheet_index, is_iso8601);
        var r0 = getDataViewMemory0().getInt32(retptr + 4 * 0, true);
        var r1 = getDataViewMemory0().getInt32(retptr + 4 * 1, true);
        var v2 = getArrayJsValueFromWasm0(r0, r1).slice();
        wasm.__wbindgen_free(r0, r1 * 4, 4);
        return v2;
    } finally {
        wasm.__wbindgen_add_to_stack_pointer(16);
    }
};

/**
* @param {Uint8Array} excel_data
* @param {boolean} is_iso8601
* @returns {any[]}
*/
module.exports.all_excel_to_json = function(excel_data, is_iso8601) {
    try {
        const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
        const ptr0 = passArray8ToWasm0(excel_data, wasm.__wbindgen_malloc);
        const len0 = WASM_VECTOR_LEN;
        wasm.all_excel_to_json(retptr, ptr0, len0, is_iso8601);
        var r0 = getDataViewMemory0().getInt32(retptr + 4 * 0, true);
        var r1 = getDataViewMemory0().getInt32(retptr + 4 * 1, true);
        var v2 = getArrayJsValueFromWasm0(r0, r1).slice();
        wasm.__wbindgen_free(r0, r1 * 4, 4);
        return v2;
    } finally {
        wasm.__wbindgen_add_to_stack_pointer(16);
    }
};

/**
* @param {Uint8Array} csv_data
* @returns {(object)[]}
*/
module.exports.csv_to_json = function(csv_data) {
    try {
        const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
        const ptr0 = passArray8ToWasm0(csv_data, wasm.__wbindgen_malloc);
        const len0 = WASM_VECTOR_LEN;
        wasm.csv_to_json(retptr, ptr0, len0);
        var r0 = getDataViewMemory0().getInt32(retptr + 4 * 0, true);
        var r1 = getDataViewMemory0().getInt32(retptr + 4 * 1, true);
        var v2 = getArrayJsValueFromWasm0(r0, r1).slice();
        wasm.__wbindgen_free(r0, r1 * 4, 4);
        return v2;
    } finally {
        wasm.__wbindgen_add_to_stack_pointer(16);
    }
};

function handleError(f, args) {
    try {
        return f.apply(this, args);
    } catch (e) {
        wasm.__wbindgen_exn_store(addHeapObject(e));
    }
}

module.exports.__wbindgen_object_drop_ref = function(arg0) {
    takeObject(arg0);
};

module.exports.__wbindgen_is_string = function(arg0) {
    const ret = typeof(getObject(arg0)) === 'string';
    return ret;
};

module.exports.__wbindgen_array_new = function() {
    const ret = [];
    return addHeapObject(ret);
};

module.exports.__wbindgen_array_push = function(arg0, arg1) {
    getObject(arg0).push(takeObject(arg1));
};

module.exports.__wbindgen_string_new = function(arg0, arg1) {
    const ret = getStringFromWasm0(arg0, arg1);
    return addHeapObject(ret);
};

module.exports.__wbindgen_error_new = function(arg0, arg1) {
    const ret = new Error(getStringFromWasm0(arg0, arg1));
    return addHeapObject(ret);
};

module.exports.__wbindgen_number_new = function(arg0) {
    const ret = arg0;
    return addHeapObject(ret);
};

module.exports.__wbindgen_bigint_from_i64 = function(arg0) {
    const ret = arg0;
    return addHeapObject(ret);
};

module.exports.__wbindgen_bigint_from_u64 = function(arg0) {
    const ret = BigInt.asUintN(64, arg0);
    return addHeapObject(ret);
};

module.exports.__wbg_set_f975102236d3c502 = function(arg0, arg1, arg2) {
    getObject(arg0)[takeObject(arg1)] = takeObject(arg2);
};

module.exports.__wbg_new_a220cf903aa02ca2 = function() {
    const ret = new Array();
    return addHeapObject(ret);
};

module.exports.__wbg_new_8608a2b51a5f6737 = function() {
    const ret = new Map();
    return addHeapObject(ret);
};

module.exports.__wbg_new_525245e2b9901204 = function() {
    const ret = new Object();
    return addHeapObject(ret);
};

module.exports.__wbg_set_673dda6c73d19609 = function(arg0, arg1, arg2) {
    getObject(arg0)[arg1 >>> 0] = takeObject(arg2);
};

module.exports.__wbg_set_49185437f0ab06f8 = function(arg0, arg1, arg2) {
    const ret = getObject(arg0).set(getObject(arg1), getObject(arg2));
    return addHeapObject(ret);
};

module.exports.__wbg_set_eacc7d73fefaafdf = function() { return handleError(function (arg0, arg1, arg2) {
    const ret = Reflect.set(getObject(arg0), getObject(arg1), getObject(arg2));
    return ret;
}, arguments) };

module.exports.__wbindgen_debug_string = function(arg0, arg1) {
    const ret = debugString(getObject(arg1));
    const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
    const len1 = WASM_VECTOR_LEN;
    getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
    getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
};

module.exports.__wbindgen_throw = function(arg0, arg1) {
    throw new Error(getStringFromWasm0(arg0, arg1));
};

const path = require('path').join(__dirname, 'excel_to_json_bg.wasm');
const bytes = require('fs').readFileSync(path);

const wasmModule = new WebAssembly.Module(bytes);
const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
wasm = wasmInstance.exports;
module.exports.__wasm = wasm;