locutus/esm/php/var/gettype.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { getPhpObjectEntry } from "../_helpers/_phpRuntimeState.js";
import { is_float as isFloat } from "../var/is_float.js";
export function gettype(mixedVar) {
    //  discuss at: https://locutus.io/php/gettype/
    // original by: Paulo Freitas
    // improved by: Kevin van Zonneveld (https://kvz.io)
    // improved by: Douglas Crockford (https://javascript.crockford.com)
    // improved by: Brett Zamir (https://brett-zamir.me)
    //    input by: KELAN
    //      note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
    //      note 1: it different from the PHP implementation. We can't fix this unfortunately.
    //   example 1: gettype(1)
    //   returns 1: 'integer'
    //   example 2: gettype(undefined)
    //   returns 2: 'undefined'
    //   example 3: gettype({0: 'Kevin van Zonneveld'})
    //   returns 3: 'object'
    //   example 4: gettype('foo')
    //   returns 4: 'string'
    //   example 5: gettype({0: function () {return false;}})
    //   returns 5: 'object'
    //   example 6: gettype({0: 'test', length: 1, splice: function () {}})
    //   returns 6: 'object'
    //   example 7: gettype(['test'])
    //   returns 7: 'array'
    let s = typeof mixedVar;
    let name = '';
    const _getFuncName = function (fn) {
        const funcNameMatch = /\W*function\s+([\w$]+)\s*\(/.exec(String(fn));
        if (!funcNameMatch) {
            return '(Anonymous)';
        }
        return funcNameMatch[1] ?? '(Anonymous)';
    };
    if (s === 'object') {
        if (typeof mixedVar === 'object' && mixedVar !== null) {
            const objectLike = mixedVar;
            const objectLength = getPhpObjectEntry(objectLike, 'length');
            const objectSplice = getPhpObjectEntry(objectLike, 'splice');
            // From: https://javascript.crockford.com/remedial.html
            // @todo: Break up this lengthy if statement
            if (typeof objectLength === 'number' &&
                !Object.prototype.propertyIsEnumerable.call(objectLike, 'length') &&
                typeof objectSplice === 'function') {
                s = 'array';
            }
            else {
                const constructorValue = getPhpObjectEntry(objectLike, 'constructor');
                if (!constructorValue) {
                    return s;
                }
                name = _getFuncName(constructorValue);
                if (name === 'Date') {
                    // not in PHP
                    s = 'date';
                }
                else if (name === 'RegExp') {
                    // not in PHP
                    s = 'regexp';
                }
                else if (name === 'LOCUTUS_Resource') {
                    // Check against our own resource constructor
                    s = 'resource';
                }
            }
        }
        else {
            s = 'null';
        }
    }
    else if (typeof mixedVar === 'number') {
        s = isFloat(mixedVar) ? 'double' : 'integer';
    }
    return s;
}